Question about 2001 Pontiac Aztek

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Emission test reject

Evaporative control system, not ready egr flow not ready, oxygen sensor not ready, can you tell me how replace these part, i want it myself. please send me tips...... and its over hot is alltime 1/3 ollmost red. wahts the problem?

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  • yadayada
    yadayada May 11, 2010

    DEAL WITH THE EMISSION ISSUE 1ST, U JUST NEED TO DRIVE THE CAR MORE TO GET THE SYSTEM SELF TESTS TO COMPLETE, DID U RESET THE COMPUTER DUE TO A CHECK ENGINE LIGHT?

  • rami khasawneh
    rami khasawneh Jan 04, 2014

    yes ,i have the same problem ...yes i rest the computer due to check engine light ....and how long i should drive ...how many Killometre to resolve the problem

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  • 11 Answers

If it's not your computer,you may need to change your sensors. Some vehicles have 1 to 5 sensors. Some have more!

Neil

Posted on Mar 14, 2009

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3 Answers

2002 Ford f150 evaporative emission control system sensor where is it located


on top of the canister purge can , next to the solenoid of same purpose

Jan 30, 2016 | Ford Cars & Trucks

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Ford OBD-II Trouble Codes


P1000 OBD-II Monitor Testing Incomplete<br />P1001 KOER Test Cannot Be Completed<br />P1039 Vehicle Speed Signal Missing or Improper<br />P1051 Brake Switch Signal Missing or Improper<br />P1100 Mass Air Flow Sensor Intermittent<br />P1101 Mass Air Flow Sensor out of Self-Test Range<br />P1112 Intake Air Temperature Sensor Intermittent<br />P1116 Engine Coolant Temperature Sensor is out of Self-Test Range<br />P1117 Engine Coolant Temperature Sensor Intermittent<br />P1120 Throttle Position Sensor out of range<br />P1121 Throttle Position Sensor Inconsistent with Mass Air Flow Sensor<br />P1124 Throttle Position Sensor out of Self-Test Range<br />P1125 Throttle Position Sensor Intermittent<br />P1127 Heated Oxygen Sensor Heater not on During KOER Test<br />P1128 Heated Oxygen Sensor Signals reversed<br />P1129 Heated Oxygen Sensor Signals reversed<br />P1130 Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 1<br />P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1<br />P1132 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1<br />P1135 Ignition Switch Signal Missing or Improper<br />P1137 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1<br />P1138 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1<br />P1150 Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 2<br />P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2<br />P1152 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2<br />P1157 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2<br />P1158 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2<br />P1220 Series Throttle Control fault<br />P1224 Throttle Position Sensor B out of Self-Test Range<br />P1230 Open Power to Fuel Pump circuit<br />P1231 High Speed Fuel Pump Relay activated<br />P1232 Low Speed Fuel Pump Primary circuit failure<br />P1233 Fuel Pump Driver Module off-line<br />P1234 Fuel Pump Driver Module off-line<br />P1235 Fuel Pump Control out of range<br />P1236 Fuel Pump Control out of range<br />P1237 Fuel Pump Secondary circuit fault<br />P1238 Fuel Pump Secondary circuit fault<br />P1250 Lack of Power to FPRC Solenoid<br />P1260 Theft Detected - Engine Disabled<br />P1270 Engine RPM or Vehicle Speed Limiter Reached<br />P1288 Cylinder Head Temperature Sensor out of Self-Test Range<br />P1289 Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range<br />P1290 Cylinder Head Temperature Sensor Signal Less Than Self-Test Range<br />P1299 Cylinder Head Temperature Sensor Detected Engine Overheating Condition<br />P1309 Misfire Detection Monitor not enabled<br />P1351 Ignition Diagnostic Monitor circuit Input fault<br />P1352 Ignition Coil A - Primary circuit fault<br />P1353 Ignition Coil B - Primary circuit fault<br />P1354 Ignition Coil C - Primary circuit fault<br />P1355 Ignition Coil D - Primary circuit fault<br />P1356 Loss of Ignition Diagnostic Module Input to PCM<br />P1358 Ignition Diagnostic Monitor Signal out of Self-Test Range<br />P1359 Spark Output circuit fault<br />P1364 Ignition Coil Primary circuit fault<br />P1380 VCT Solenoid Valve circuit Short or Open<br />P1381 Cam Timing Advance is excessive<br />P1383 Cam Timing Advance is excessive<br />P1390 Octane Adjust out of Self-Test Range<br />P1400 Differential Pressure Feedback Electronic Sensor circuit Low Voltage<br />P1401 Differential Pressure Feedback Electronic Sensor circuit High Voltage<br />P1403 Differential Pressure Feedback Electronic Sensor Hoses Reversed<br />P1405 Differential Pressure Feedback Electronic Sensor circuit Upstream Hose<br />P1406 Differential Pressure Feedback Electronic Sensor circuit Downstream Hose<br />P1407 EGR No Flow Detected<br />P1408 EGR Flow out of Self-Test Range<br />P1409? EGR Vacuum Regulator circuit malfunction<br />P1409? Electronic Vacuum Regulator Control circuit fault<br />P1410 EGR Barometric Pressure Sensor VREF Voltage<br />P1411 Secondary Air is not being diverted<br />P1413 Secondary Air Injection System Monitor circuit Low Voltage<br />P1414 Secondary Air Injection System Monitor circuit High Voltage<br />P1442 Secondary Air Injection System Monitor circuit High Voltage<br />P1443 Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault<br />P1444 Purge Flow Sensor circuit Input Low<br />P1445 Purge Flow Sensor circuit Input High<br />P1450 Inability of Evaporative Emission Control System to Bleed Fuel Tank<br />P1451 EVAP Control System Canister Vent Solenoid Circuit Malfunction<br />P1452 Inability of Evaporative Emission Control System to Bleed Fuel Tank<br />P1455 Substantial Leak or Blockage in Evaporative Emission Control System<br />P1460 Wide Open Throttle Air Conditioning Cutoff circuit malfunction<br />P1461 Air Conditioning Pressure Sensor circuit Low Input<br />P1462 Air Conditioning Pressure Sensor circuit high Input<br />P1463 Air Conditioning Pressure Sensor Insufficient Pressure change<br />P1464 ACCS to PCM High During Self-Test<br />P1469 Low Air Conditioning Cycling Period<br />P1473 Fan Secondary High with Fans Off<br />P1474 Low Fan Control Primary circuit<br />P1479 High Fan Control Primary circuit<br />P1480 Fan Secondary Low with Low Fans On<br />P1481 Fan Secondary Low with High Fans On<br />P1483 Power to Cooling Fan Exceeded Normal Draw<br />P1484 Variable Load Control Module Pin 1 Open<br />P1500 Vehicle Speed Sensor Intermittent<br />P1501 Programmable Speedometer & Odometer Module/Vehicle Speed Sensor Intermittent circuit-failure<br />P1502 Invalid or Missing Vehicle Speed Message or Brake Data<br />P1504 Intake Air Control circuit malfunction<br />P1505 Idle Air Control System at Adaptive Clip<br />P1506 Idle Air Control Over Speed Error<br />P1507 Idle Air Control Under Speed Error<br />P1512 Intake Manifold Runner Control Stuck Closed<br />P1513 Intake Manifold Runner Control Stuck Closed<br />P1516 Intake Manifold Runner Control Input Error<br />P1517 Intake Manifold Runner Control Input Error<br />P1518 Intake Manifold Runner Control fault - Stuck Open<br />P1519? Intake Manifold Runner Control Stuck Open<br />P1520? Intake Manifold Runner Control circuit fault<br />P1519? Intake Manifold Runner Control fault - Stuck Closed<br />P1520? Intake Manifold Runner Control fault<br />P1530 Open or Short to A/C Compressor Clutch circuit<br />P1537 Intake Manifold Runner Control Stuck Open<br />P1538 Intake Manifold Runner Control Stuck Open<br />P1539 Power to A/C Compressor Clutch circuit Exceeded Normal Current Draw<br />P1549 Intake Manifold Temperature Valve Vacuum Actuator Connection<br />P1550 Power Steering Pressure Sensor out of Self-Test Range<br />P1605 PCM Keep Alive Memory Test Error<br />P1625 Voltage to Vehicle Load Control Module Fan circuit not detected<br />P1626 Voltage to Vehicle Load Control Module circuit not detected<br />P1650 Power Steering Pressure Switch out of Self-Test Range<br />P1651 Power Steering Pressure Switch Input fault<br />P1700 Transmission system problems<br />P1701 Reverse Engagement Error<br />P1702 Transmission system problems<br />P1703 Brake On/Off Switch out of Self-Test Range<br />P1704 Transmission system problems<br />P1705 Manual Lever Position Sensor out of Self-Test Range<br />P1709 Park or Neutral Position Switch out of Self-Test Range<br />P1710 Transmission system problems<br />P1711 Transmission Fluid Temperature Sensor out of Self-Test Range<br />P1713<br />thru<br />P172 Transmission system problems<br />P1729 4x4 Low Switch Error<br />P1740 Transmission system problems<br />P1741 Torque Converter Clutch Control Error<br />P1742 Torque Converter Clutch Solenoid Faulty<br />P1743 Torque Converter Clutch Solenoid Faulty<br />P1744 Torque Converter Clutch System Stuck in Off Position<br />P1745 Transmission system problems<br />P1746 Electronic Pressure Control Solenoid - Open circuit<br />P1747 Electronic Pressure Control Solenoid - Short circuit<br />P1749 Electronic Pressure Control Solenoid Failed Low<br />P1751 Shift Solenoid No. 1 Performance<br />P1754 Coast Clutch Solenoid circuit malfunction<br />P1756 Shift Solenoid No. 2 Performance<br />P1760 Transmission system problems<br />P1761 Shift Solenoid No. 3 Performance<br />P1762 Transmission system problems<br />P1767 Transmission system problems<br />P1780 Transmission Control Switch circuit is out of Self-Test Range<br />P1781 4x4 Low Switch is out of Self-Test Range<br />P1783 Transmission Over-Temperature Condition<br />P1784 Transmission system problems<br />P1785 Transmission system problems<br />P1786 Transmission system problems<br />P1787 Transmission system problems<br />P1788 Transmission system problems<br />P1789 Transmission system problems<br />P1900 Transmission system problems

on May 23, 2011 | Ford F Cars & Trucks

2 Answers

What does fault code P0497 mean for Honda Cr-v ?


Nothing for that code either. Are you sure you are reading the reader properly?

P1382 Cylinder Position Sensor No Signal P1456 EVAP Emission Control System Leak Detected (Fuel Tank System) P1457 EVAP Emission Control System Leak Detected (Control Canister System) P1459 EVAP Emission Purge Flow Switch Malfunction P1486 Thermostat Range/Performance Problem P1491 EGR Valve Lift Insufficient Detected P1498 EGR Valve Lift Sensor High Voltage P1508 IAC Valve Circuit Failure

Dec 30, 2015 | Honda Cars & Trucks

1 Answer

Code p0403


EGR is the exhaust gas recirculating valve . It's part of the emission system designed to lower emission of nitrates of oxygen. The vehicles PCM is sensing a problem with the flow or lack of flow thru the EGR valve. The EGR system has several components including the egr valve, erg solenoid, possible EGR temperature sensor and/or a DPFE ( differential pressure feedback sensor) and vacuum hoses. They are located on or near the intake manifold and connects to the exhaust manifold system also.

Jul 15, 2014 | 2002 Mazda MPV

3 Answers

2002 Chevy replaced Egr valve and oxygen sensor 2says not ready for Egr and evap


Replacing parts on the chance of solving the problem can get expensive. Take it to someone who has a scanner tool to check the sensors. Sound like you have a sensor not working.

Jun 18, 2014 | 2002 Chevrolet Impala

1 Answer

Emmissions test can't be finished because the computer needs to be reset after a new battery cable


That should be enough time to reset the emission systems. Did you clear codes since then or remove the battery or one its cables for another reason?
Check to make sure all the battery cables are tight and clean. Sometimes if a cable doesn't have a good connection to the battery due to being loose or dirty, it may not allow the battery to keep the car's memory when it's shut off so may reset the emissions.

Sep 20, 2012 | 2001 Oldsmobile Silhouette

1 Answer

I have an 04 Kia spectra with a PO121 code. What domestic this mean


Well.... Here is a full list of the codes I can find that Kia list. Oddly it jumps from P0120 to P0122

I hope the attached will help, but you may need to talk to your dealer.


Diagnostic Codes
Kia
Without Onboard Diagnostics (OBD-II)
2 Distributor no Signal.
3 Distributor G Signal.
7 Fault on SGT Signal.
8 Mass Air Flow Sensor.
9 Engine Coolant Temperature Sensor.
10 Intake Air Temperature Sensor.
12 Throttle Position Sensor.
14 Atmospheric Pressure Sensor.
15 Oxygen Sensor.
16 EGR Valve Position Sensor.
17 Feedback System.
18 Injector No. 1 open or short.
19 Injector No. 2 open or short.
20 Injector No. 3 open or short.
21 Injector No. 4 open or short.
24 Fuel Pump Relay open or short.
25 Pressure Regulator Control Solenoid Valve.
26 Purge Control Solenoid Valve.
28 Solenoid Valve (EGR) open or short.
34 Idle Speed Control Solenoid Valve.
35 Deteriorated Injector.
36 Deteriorated Air Flow Sensor.
37 Intake System Air Leakage.
41 Variable Inertia Charging System Solenoid Valve.
46 A/C Cut Relay open or short.
48 Power Stage Group 1 Malfunction (inside ECM). Injector 1-4 Purge Solenoid Valve, EGR Solenoid Valve or Damaged Power Stage.
49 Power Stage Group 2 Malfunction (inside ECM). Idle Speed Control Valve Failure or Damaged Power Stage.
56 Idle Speed Control Valve Closing Coil open or short.
57 A/C Compressor Input Signal short.
73 Vehicle Speed Sensor open or short.
87 Malfunction Indicator Lamp short Circuit.
88 ECM Data.
99 Battery.





OBD-II

P0100 Mass Air Flow or Volume Air Flow Circuit Malfunction.
P0101 Mass Air Flow or Volume Air Flow Circuit Range/Performance problem.
P0102 Mass Air Flow or Volume Air Flow Circuit Low Input.
P0103 Mass Air Flow or Volume Air Flow Circuit High Input.
P0107 MAP/BARO Circuit Low Input.
P0108 MAP/BARO Circuit High Input.
P0110 A/T Circuit Malfunction.
P0115 Engine Coolant Temperature Circuit Malfunction.
P0116 Engine Coolant Temperature Circuit Range/Performance Condition.
P0117 Engine Coolant Temperature Circuit Low Input.
P0118 Engine Coolant Temperature Circuit High Input.
P0120 Throttle Position Malfunction - Circuit A.
P0122 APP/TPP Sensor Switch Low Input - Circuit A.
P0123 APP/TPP Sensor Switch High Input - Circuit A.
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control.
P0130 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 1.
P0131 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 1.
P0132 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 1.
P0133 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 1.
P0134 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 1.
P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1.
P0136 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 2.
P0137 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 2.
P0138 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 2.
P0139 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 2.
P0140 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 2.
P0141 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 2.
P0170 Fuel Trim Malfunction - Bank 1.
P0171 System too Lean - Bank 1.
P0172 System too Rich - Bank 1.
P0261 Injector Circuit Low - Cyl. 1.
P0262 Injector Circuit High - Cyl. 1.
P0264 Injector Circuit Low - Cyl. 2.
P0265 Injector Circuit High - Cyl. 2.
P0267 Injector Circuit Low - Cyl. 3.
P0268 Injector Circuit High - Cyl. 3.
P0270 Injector Circuit Low - Cyl. 4.
P0271 Injector Circuit High - Cyl. 4.
P0300 Multiple/Random Misfire detected.
P0301 Misfire detected - Cyls. 1-4.
P0302 Misfire detected - Cyls. 1-4.
P0303 Misfire detected - Cyls. 1-4.
P0304 Misfire detected - Cyls. 1-4.
P0325 Knock Sensor Circuit Malfunction
P0326 Knock Sensor 1 Circuit Range/Performance - Bank 1 or Single Sensor.
P0335 Crankshaft Position Sensor Malfunction - Circuit A.
P0336 Crankshaft Position Sensor Range/Performance - Circuit A.
P0340 Crankshaft Position Sensor Circuit Malfunction.
P0342 Crankshaft Position Sensor Circuit Low Input.
P0343 Crankshaft Position Sensor Circuit High Input.
P0400 EGR Flow Malfunction.
P0403 EGR Circuit Malfunction.
P0404 EGR Circuit Range/Performance Malfunction.
P0420 Catalyst System Efficiency below Threshold - Bank 1.
P0422 Main Catalyst Efficiency below Threshold - Bank 1.
P0440 Evaporative Control Malfunction.
P0441 Evaporative Control System - Improper Purge.
P0442 Evaporative Control System - Small Leak detected.
P0443 Evaporative Control System Purge Control Valve Circuit Malfunction.
P0446 Evaporative Vent Control Circuit Malfunction.
P0447 Evaporative Vent Control Circuit Open.
P0448 Evaporative Vent Control Circuit Short.
P0450 Evaporative System Pressure Sensor Circuit Malfunction.
P0452 Evaporative Control System Pressure Sensor Low Input.
P0453 Evaporative Control System Pressure Sensor High Input.
P0455 Evaporative Control System - Large Leak detected.
P0470 Exhaust Pressure Sensor Malfunction.
P0500 Vehicle Speed Sensor Malfunction.
P0501 Vehicle Speed Sensor Range/Performance.
P0505 Idle Air Control System Malfunction.
P0506 Idle Air Control System Malfunction - RPM Lower than expected.
P0507 Idle Air Control System Malfunction - RPM Higher than expected.
P0510 CTP Switch Malfunction.
P0561 System Voltage Unstable.
P0562 System Voltage Low.
P0563 System Voltage High.
P0601 Internal Control Module Memory Checksum Error.
P0604 Internal Control Module RAM Error.
P0703 Torque Converter/Brake Pedal Switch Malfunction - Circuit B.
P0705 Transaxle Range Sensor Circuit Malfunction (PRNDL Input).
P0706 A/T Range Sensor Circuit Range/ Performance.
P0710 Transaxle Fluid Temperature Sensor Circuit Malfunction.
P0711 A/T Fluid Temperature Sensor Circuit Range/Performance.
P0715 Input/Turbine Speed Sensor Circuit Malfunction.
P0722 Output Speed Sensor Circuit No Signal.
P0726 Engine Speed Input Circuit Range/ Performance.
P0727 Engine Speed Input Circuit - No Signal.
P0731 A/T Gear 1 Improper Ratio.
P0732 A/T Gear 2 Improper Ratio.
P0733 A/T Gear 3 Improper Ratio.
P0734 A/T Gear 4 Improper Ratio.
P0740 Torque Converter Clutch System Malfunction.
P0743 Torque Converter Clutch Circuit Electrical.
P0750 Shift Solenoid "A" Malfunction.
P0753 Shift Solenoid "A" Electrical.
P0755 Shift Solenoid "B" Malfunction.
P0758 Shift Solenoid "B" Electrical.
P0760 Shift Solenoid "C" Malfunction.
P1000 Readiness Function Code.
P1115 Engine Coolant Temperature Signal from ECM to TCM.
P1121 Throttle Position Sensor Signal Malfunction from ECM to TCM.
P1170 Front Heated Oxygen Sensor Stuck.
P1195 EGR Pressure Sensor (1.6L) or Boost Sensor (1.8L) Open or Short.
P1196 Ignition Switch "Start" Open or Short (1.6L).
P1250 Pressure Regulator Control Solenoid Valve Open or Short.
P1252 Pressure Regulator Control Solenoid Valve No. 2 Circuit Malfunction.
P1307 Chassis Acceleration Sensor Signal Malfunction.
P1308 Chassis Acceleration Sensor Signal Low.
P1309 Chassis Acceleration Sensor Signal High.
P1345 No SGC Signal (1.6L).
P1386 Knock Sensor Control Zero Test.
P1402 EGR Valve Position Sensor Open or Short.
P1449 Canister Drain Cut Valve Open or Short (1.8L).
P1450 Excessive Vacuum Leak.
P1455 Fuel Tank Sending Unit Open or Short (1.8L).
P1457 Purge Solenoid Valve Low System Malfunction.
P1458 A/C Compressor Control Signal Malfunction.
P1485 EGR Solenoid Valve Vacuum Open or Short.
P1486 EGR Solenoid Valve Vent Open or Short.
P1487 EGR Boost Sensor Solenoid Valve Open or Short.
P1496 EGR Stepper Motor Malfunction - Circuit 1 (1.8L).
P1497 EGR Stepper Motor Malfunction - Circuit 2 (1.8L).
P1498 EGR Stepper Motor Malfunction - Circuit 3 (1.8L).
P1499 EGR Stepper Motor Malfunction - Circuit 4 (1.8L).
P1500 No Vehicle Speed Signal to TCM.
P1505 Idle Air Control Valve Opening Coil Voltage Low.
P1506 Idle Air Control Valve Opening Coil Voltage High.
P1507 Idle Air Control Valve Closing Coil Voltage Low.
P1508 Idle Air Control Valve Closing Coil Voltage High.
P1523 VICS Solenoid Valve.
P1586 A/T-M/T Codification.
P1608 PCM Malfunction.
P1611 MIL Request Circuit Voltage Low.
P1614 MIL Request Circuit Voltage High.
P1624 MIL Request Signal from TCM to ECM.
P1631 Alternator "T" Open or No Power Output (1.8L).
P1632 Battery Voltage Detection Circuit for Alternator Regulator (1.8L).
P1633 Battery Overcharge.
P1634 Alternator "B" Open (1.8L).
P1693 MIL Circuit Malfunction.
P1743 Torque Converter Clutch Solenoid Valve Open or Short.
P1794 Battery or Circuit Failure.
P1795 4WD Switch Signal Malfunction.
P1797 P or N Range Signal or Clutch Pedal Position Switch Open or Short.

Jun 21, 2011 | 2004 Kia Spectra

1 Answer

I have a 2001 nissan sentra xe and my check engine light is on i had a diagnostic test and the codes PO 455 and PO 0440 came back what does this mean?


PO 455- Evaporative emission control System leak detected (check exhaust system, egr valve, or entire intake and exhaust system)


PO440- Evaporative Emission System Malfunction (also check oxygen sensor)

Jul 13, 2009 | 2001 Nissan Sentra

1 Answer

1998 PONTIAC SUNFIRE ADVISE


Exhaust Gas Recirculation System Is the main problem here. the other code P0118 may be a bad temprature sensor or your thermostate needs to be changed. Last it could be a weak water pump. 

So what is an EGR system and how does it work? EGR stands for Exhaust Gas Recirculation, and as its name implies, this system allows exhaust gasses from your car to be re-circulated into the engine, helping to reduce emissions. These systems are mostly comprised of the EGR valve, a DPFE (Delta Pressure Feedback EGR) sensor, hoses, a vacuum regulator, some vacuum lines, wiring, the computer and the exhaust tube leading to the valve itself. 
The car's wiring can be tested in the normal fashion by looking for broken and lose wire, and all vacuum lines can be checked easily for cracks, leaks and correct routing.
The last thing i would then check is the the EGR valve, EGR vacuum regulator and DPFE sensor (or similar flow sensor).
I hope this helps and good luck

Apr 09, 2009 | 1998 Pontiac Sunfire

1 Answer

1995 mercury villager check engine code p1200 injector open


P0400 = EGR Flow
P0325 = knock sensor (Do not ever change a knock sensor, they don't affect anything and cost $600 to replace for absolutely no gain)
P1200 = I can't find this one. I think it's injector flow
report back on what you find.
Egr flow may be plugged egr passages or a bad solenoid.
--------------
1996 PCED OBDII-Villager SECTION 1B: Description and Operation
Exhaust Gas Recirculation System
Exhaust Gas Recirculation (EGR) System Operation The exhaust gas recirculation (EGR) system (Figure 1 below) recirculates a portion of the exhaust gases into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies according to operating conditions and will be cut completely under:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
The exhaust gas recirculation (EGR) system on the Villager uses the exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid valve to provide vacuum to both the EGR valve and the EVAP canister when commanded by the PCM. If the exhaust backpressure is sufficient to close the EGR backpressure transducer valve, vacuum is sent to the EGR valve and allows EGR gas to flow into the intake manifold. If the exhaust backpressure is not sufficient, the EGR backpressure transducer will remain open and allow vacuum from the EGR/EVAP control solenoid to vent to the atmosphere.
The EGR system monitor, for OBD II regulations, uses an EGR temperature sensor to monitor the EGR system. The EGR temperature sensor is a thermister located in the EGR passageway. When hot exhaust gas is recirculated into the engine, the temperature at the EGR passageway increases. This increase is sensed by the EGR temperature sensor and a signal is sent to the PCM to indicate EGR flow. If the EGR temperature sensor does not detect EGR flow when commanded by the PCM after two consecutive drive cycles, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored. The MIL will be turned off after three consecutive drive cycles are completed with no malfunctions detected. The DTC will remain stored in the PCM memory until 80 drive cycles have been completed without the same malfunction detected in the system.
Figure 1: Exhaust Gas Recirculation (EGR) System Diagram Item Number Description 1 — EGR/EVAP Control Solenoid 2 — Air Cleaner Housing 3 — Throttle Valve 4 — EGR Temperature Sensor 5 — EGR Valve 6 — EGR Backpressure Transducer 7 — EVAP Canister
Exhaust Gas Recirculation (EGR) Backpressure Transducer Valve The exhaust gas recirculation (EGR) backpressure transducer valve is used to control EGR. The EGR valve is operated by ported vacuum, but the ported vacuum will normally be vented off at the EGR backpressure transducer valve. As rpm increases, exhaust pressure increases and pushes on the diaphragm in the EGR backpressure transducer valve and closes the vacuum vent.
Figure 2: EGR Backpressure Transducer Value
Item Number Description 1 — Throttle Valve 2 — Vacuum Port 3 9D475 EGR Valve 4 9F452 EGR Backpressure Transducer Valve 5 — EVAP Canister 6 — EGR/EVAP Control Solenoid 7 — Vent
EGR/EVAP Control Solenoid The exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid (Figure 3) is controlled by the powertrain control module (PCM). The EGR/EVAP control solenoid controls vacuum to both the exhaust gas recirculation (EGR) valve and to the evaporative (EVAP) emission canister. When the EGR/EVAP control solenoid is off (12 V signal from the PCM) vacuum is supplied to both the EGR valve and to the EVAP canister. When the EGR/EVAP control solenoid is on (ground supplied by PCM) vacuum is vented to the atmosphere keeping the EGR valve closed and no vacuum to the EVAP canister. The PCM will command the EGR/EVAP control solenoid on at:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
Figure 3: Exhaust Gas Recirculation/Evaporative Emission (EGR/EVAP) Control Solenoid
Exhaust Gas Recirculation (EGR) Temperature Sensor
The exhaust gas recirculation (EGR) temperature sensor (Figure 4) is a thermister type sensor that monitors the temperature of the exhaust in the EGR passageway. As the EGR flow increases, the temperature increases. This process creates a change in the resistance of the sensor, which decreases as the temperature increases. The signal is sent to the powertrain control module (PCM) to indicate that the EGR system is working properly. If the EGR temperature sensor does not change resistance as the PCM expects on two consecutive drives, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored.
Figure 4: EGR Temperature Sensor Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve (Figure 5) recirculates portions of the exhaust gas back into the intake manifold to reduce the amount of the NOx released during combustion and to reduce combustion temperature. The amount of exhaust gases that are released into the engine is proportional to the load on the engine.
Figure 5: EGR Valve

Mar 20, 2009 | 1995 Mercury Villager

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