Question about 2002 Mazda MPV
I just change the whole intake manifold gasket but I didn't change the bank 1 circuit 1 02 sensor and still still runs rough idle.
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Posted on Jan 02, 2017
posibly he has a vaccum leak and somesome saw the o2 rading or the fuel trims. can you hear hissing sounds from the engine area when it's running? on the back of the intake manifold there is a hose that gets soaked with oil and leaks. you may have more than one problem. the IAC valve which is on top of the throttle body may be deffective.
Posted on Jun 24, 2009
DTC P0401 - Insufficient EGR Flow
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
DTC P0106 - MAP/Barometric Pressure Circuit Range/Performance Problem
The Powertrain Control Module (PCM) uses the Manifold Absolute Pressure Sensor (MAP) to monitor engine load. (NOTE: Some vehicles have a Barometric Pressure (BARO) sensor that is integral to the Mass Air Flow (MAF) sensor and do not have a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAP sensor where the MAP sensor functions as a backup input in case of MAF failure.) The PCM supplies a 5 Volt reference signal to the MAP sensor. Usually the PCM also supplies a ground circuit to the MAP sensor as well. As the manifold pressure changes with load, the MAP sensor input informs the PCM. At idle the voltage should be 1 to 1.5 Volts and approximately 4.5 Volts at Wide Open Throttle (WOT). The PCM looks for any change in manifold pressure to be preceded by a change in engine load in the form of changes in throttle angle, engine speed, or Exhaust Gas Recirculation (EGR) flow. If the PCM doesn't see any of these factors change while detecting a rapid change in MAP value, it will set a P0106.
A P0106 could be caused by:
Bad MAP sensor
Water/dirt intrusion affecting MAP sensor connector
Intermittent open in the reference, ground, or signal wire for the MAP sensor
Intermittent short in the reference, ground, or signal wire for the MAP sensor
Ground problem due to corrosion causing intermittent signal problem
A break in the flexible air intake duct between the MAF and the intake manifold
Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)
Possible Solutions: Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working.
If the MAP reading doesn't change perform the following:
With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary.
If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest.
If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit.
If ground is present, then replace MAP sensor.
DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.
This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.
You'll want to also read our article on short and long term fuel trims to help understand the operation of the engine. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
A code P0171 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty
Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor
Possible cracked vacuum or PCV line/connection
Faulty or stuck open PCV valve
Failed or faulty oxygen sensor (bank 1, sensor 1)
Sticking/plugged or failed fuel injector
Low fuel pressure (possible plugged/dirty fuel filter!)
Exhaust leak between engine and first oxygen sensor
Possible Solutions: A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. If you're on a tight budget, start there, but that may not be the fix for certain. So, possible solutions include:
Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace/repair as required
Inspect all hoses and connections in the air intake system
Inspect and/or test the intake manifold gaskets for leakage
Check for a dirty fuel filter and proper fuel pressure
Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool
If you have access, you may want to run a smoke test
DTC P1170 - HO2S Bank 1 Sensor 1 Circuit Fixed (Bank 1 Sensor 1)
Most likelly cause is Aging Heated Oxygen Sensor 1/1 Front RH. Hook up a Scantool and monitor sensor responce. You can also check resistance of Heater on terminal D and C for about 6ohms.
As usual check for any vacuum/exhaust leaks. Maybe check fuel pressure and fuel filter.
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Posted on Aug 02, 2012
Tips for a great answer:
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Intake Manifold Runner Control Stuck Open
Intake Air Control circuit malfunction
Idle Air Control Over Speed Error
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I hate to hear you are havine so much trouble. These are a basic descrition of each of the codes.
If each of these codes are active, i would imagine you windstar isn
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P1100 Manifold Absolute Pressure Sensor Range/Performance
P1102 Manifold Absolute Pressure Sensor Circuit Low Input
P1103 Manifold Absolute Pressure Sensor Circuit High Input
P1123 Lang Term Fuel Trim Adaptive Too Lean
P1124 Long Term Fuel Trim Adaptive Too Rich
P1127 Long Term Fuel Trim Multiplier Too Rich
P1128 Long Term Fuel Trim Multiplier Too Lean
P1134 HO2S Bank 1 Sensor 1 Transition Time Switch (Bank 1 Sensor I)
P1154 HO2S Bank 2 Sensor 1 Transition Time Switch (Bank 2 Sensor 1)
P1166 HO2S Bank 1 Sensor 1 Controller Adaptive Diagnosis Fault (Bank 1)
P1167 HO2S Bank 1 Sensor 1 Controller Adaptive Diagnosis Fault (Bank 2)
P1168 HO2S Bank 1 Sensor 1 Heater Power Incorrect (Bank 1 Sensor 2)
P1169 HO2S Bank 1 Sensor 1 Heater Power incorrect (Bank 2 Sensor 2)
P1372 Segment Time Incorrect
P1400 Manifold Differential Pressure Sensor Circuit
P1440 EVAP System Vent Solenoid Circuit
P1443 EVAP System Fault (Fuel Tank Cap Missing)
P1510 Idle Control Valve Opening Circuit Shorted (Coil 1)
P1511 Idle Control Valve Command Signal Shorted (Coil 2)
P1513 Idle Air Control Valve Opening Coil Circuit Open (Coil 1)
P1521 Power Steering Switch Input Circuit
P1529 Customer Snapshot Request VIA CAN
P1552 Idle Air Control Valve Closing Coil Circuit Shorted
P1553 Idle Air Control Valve Closing Coil Circuit Open
P1586 Encoding Signal Circuit Not Rationale
P1602 Serial Communication Fault with Transmission Control Unit
P1605 Rough Road Sensor Circuit
P1606 Rough Road Sensor Circuit Not Valid
P1611 MIL Request Signal Circuit Low Input
P1613 ECU Self-Test Failed
P1614 MIL Request Signal Circuit High Input
P1616 Main Relay Fault
P1623 Diagnostic Lamp Power Stage Fault
P1624 MIL On Request Signal//Cooling Fan Relay Low Circuit
P1625 Cooling Fan Relay High Circuit
P1665 Power Stage Group 'A' Fault
P1670 Power Stage Group 'B' Fault
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