Question about 1989 Chevrolet S-10 Blazer

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I have 97 blazer with 4.3.had a deadshort to 5v reference wire that controls tps, air temp sensor circuit short was located a fuel level buffer module. relaced circuit board ....this resolved the low or no voltage issue. the problem now is that the car will crank, has spark and fuel but will not fire. i have replaced fuel pump, fuel pressure regulator and tested for voltage pulses at injectors.... any thoughts

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  • brealtile May 30, 2010

    also had upper intake plenum off and no signs of leakage at injector spider......no fuel in oil.....asny more thoughts?

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  • 288 Answers

Just a thought pull a coulpe of spark plugs see if there flooded also if you can scan the veh look at tps voltage now and look for cranking rpms should be around 240 rpms

Posted on May 30, 2010

  • brealtile May 30, 2010

    tps volts at 5.08, plugs not fouled or flooded do not have a way of checking cranking rpm but engine does crank strong still looking for answers......any would be much appreciated

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My 2003 dodge is running real rough i put a scanner on it and it pulled up p0508,p0113,andp0123 what are they and how hard is it to change


code p 0113 refers to intake air temperature (AT) sensor ---circuit malfunction===causes ---wiring open circuit/ short to to positive ---wiring short to ground ---ground wire defective ---IAT sensor ---ECM code p 0123 refers to throttle position (TP) sensor A/ accelerator pedal position (AAP) sensor A high input=== causes ---wiring short to positive -- TP/APP sensor ---ECM
also refers to TP/AAP switch A--low input=== causes wiring short to ground --TP/AAP switch---ECM
code p 0508 refers to idle air control (IAC) system---circuit low===causes ---wiring short to ground ---IAC valve ---ECM

Nov 29, 2016 | Dodge Cars & Trucks

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Detroit Diesel Fault Codes


Code Description DDEC V Circuit
11 P 187 4 Chain PTO. Short circuit in the power
11 P 187 7 control system PTO wrong answers
12 P 187 3 Chain PTO. Short circuit in the ground
13 P 111 4-level circuit antifreeze. Short circuit in the ground
13 P 111 6 second-level circuit antifreeze. Short circuit in the ground
14 P 52 3 circuit coolant temperature intercooler. Short circuit in the power
14 P 110 3 circuit temperature antifreeze. Short circuit in the power
14 P 175 3 Chain oil temperature. Short circuit in the power
15 P 52 4 circuit coolant temperature intercooler. Short circuit in the ground
15 P 110 4 circuit temperature antifreeze. Short circuit in the ground
15 P 175 4 Chain oil temperature. Short circuit in the ground
16 P 111 3-level circuit antifreeze. Short circuit in the power
16 P 111 5 second circuit level antifreeze. Short circuit in the power
17 P 51 3 Throttle position circuit failed high
17 P 72 3 Bypass position circuit failed high
17 P 3 354 Relative humidity sensor circuit failed high
18 P 51 4 Throttle position circuit failed low
18 P 72 4 Bypass position circuit failed low
18 P 354 4 Relative humidity sensor circuit failed low
21 P 91 3 TPS circuit failed high
22 P 91 4 TPS circuit failed low
23 s 65 3 Oxygen content circuit failed high
23 P 174 3 Chain fuel temperature. Short circuit in the power
24 s 65 4 Oxygen content circuit failed low
24 p 174 4 Chain fuel temperature. Short circuit in the ground
25 no codes
26 s 25 November Aux. shutdown # 1 active
26 S 61 11 Aux. shutdown # 2 active (Incorrect SID. subject to change)
27, p 105 3 circuit temperature in the reservoir. Short circuit in the power
27 p 171 3 Ambient air temp circuit failed high
27 p 172 3 Air temp, circuit failed high
28, p 105 to 4 Chain manifold temperature. Short circuit in the ground
28 p 171 4 Ambient air temp circuit failed low
28 p 172 4 Air temp, circuit failed low
29 p 404 4 TCO temperature circuit failed low
29 p 351 4 TCI Temperature circuit failed low
31 S 51 3 Aux. Output # 3 open circuit (high side) S3
31 S 51 4 Aux. Output # 3 short to ground (high side) S3
31 S 51 7 Aux. Output # 3 mech. system fail S3
31 s 52 3 Aux. Output # 4 open circuit (high side) T3
31 s 52 4 Aux. Output # 4 short to ground (high side) T3
31 s 52 7 Aux. Output # 4 mech. system fail T3
32 S 238 3 SEL short to battery B1
32 S 238 4 SEL open circuit B1
32 s 239 3 CEL short to battery B2
32 s 239 4 CEL open circuit B2
33 p 102 3 Boost pressure circuit failed high
34 p 102 4 Boost pressure circuit failed low
35 p 19 March Ext range oil pressure circuit failed high
35 p 100 3 Chain oil pressure. Short circuit in the power
36 P 19 April Ext range oil pressure circuit failed low
36 P 100 4 Chain oil pressure. Short circuit in the ground
37 P 18 March Ext range fuel pressure circuit failed high
37 P 94 3 Chain fuel pressure. Short circuit in the power
37 P 95 3 Fuel Filter Restriction circuit failed high
38 P 18 April Ext range fuel pressure circuit failed low
38 P 94 4 Chain fuel pressure. Short circuit in the ground
38 P 95 4 Fuel Filter Restriction circuit failed low
39 S 146 2 Mechanical error EGR valve
39 S 146 12 Mechanical error EGR valve
39 S 146 return valve 7 does not meet the exhaust
39 S 147 2 turbocharger control mechanism does not respond
39 s 147 12 turbocharger control mechanism does not respond
39 s 14 147 current returns exhaust gases enough
39 S 147 11 turbocharger control mechanism does not respond
39 S 147 7 turbocharger control mechanism does not respond
41 S 21 0 Too many SRS (missing TRS)
42 S 21 January Too few SRS (missing SRS)
43 p 111 1 Low coolant level
44 p 52 0 ntercooler coolant temp, high
44 p 105 0 temperature in the reservoir above the norm
44 p 110 0 antifreeze temperature above normal
44 p 172 0 Air inlet temp, high
44 p 175 0 Oil temperature above normal
45 p 19 January Ext range oil pressure low
45 p 100 1 Oil pressure below normal
46 p 168 1 Low voltage batteries
46 S 214 1 RTC Backup Battery Voltage Low
46 S 232 1 Sensor Supply Voltage Low A3 & W1
P 0 47 18 Ext range fuel pressure high
P 47 94 0 The fuel pressure above normal
47 p 0 102 Turbo boost press high
47 p 106 0 Air inlet pressure high or TCBV diff press high
47 p 164 0 Injection control pressure high
48 p 18 January Ext range fuel pressure low
48 p 94 1 fuel pressure below normal
48 p 106 1 Air inlet pressure low
48 p 164 1 Injection control pressure low
48 p 351 1 TCI Temperature below range
48 p 404 1 TCO Temperature below range
48 p 411 1 EGR Delta pressure low
48 p 412 1 EGR Temperature low
49 p 351 0 TCI Temperature above range
49 p 404 0 TCO Temperature above range

More Fault Codes here Detroit Disel DTC

on Dec 20, 2016 | Cars & Trucks

1 Answer

4x4 4.0l V6. What are the probable causes of DTCs P0112, P0117, P0122, P0513, P0556, and P0565?


code p 0112 refers to intake air temp (IAT) sensor --circuit malfunction===cause --wiring short to graound--wiring short to positive --IAT sensor ---ECM
code p 0117 refers to engine coolant temp (ECT) sensor--circuit malfunction=== causes --coolant thermostat---wiring short to ground--wiring short to positive ---ECT sensor
code p 0122 refers to throttle position (TP) sensor A/ accelerator pedal position (APP) sensor A low input === causes wiring short to ground--TP/APP sensor --ECM
There are 3 responses to p 0122 and all refer to TP switch /sensor plus wiring open /short to ground/ short to positive
code p 0513 refers to incorrect immobilizer key=== causes immobilizer system
code p 0556 refers to brake booster pressure sensor---circuit range / performance=== causes --wiring---poor connection---brake booster pressure sensor---ECM
code p 0565 refers to cruise control master switch. off signal --malfunction === causes wiring---cruise control master switch--ECM
by reading all the codes you will see that common causes are wiring problems and ECM so may be a quick check would be to replace the ECM with a known working unit first and work back from there

Feb 23, 2016 | 1994 Ford Ranger Supercab

1 Answer

What are the probable causes of DTCs P0030, P0039, P0074, and P0098?


code p 0030 refers to heated oxygen sensor (HO2S) 1 bank 1 -heater control-circuit malfunction
code p 0039 refers to turbo/super charger bypass valve , control circuit --range /performance problem===causes --wiring--- bypass valve
code p 74 refers to outside air temperature sensor--circuit intermittent===causes ---wiring---poor connection---out side air temp sensor---ECM
code p 0098 refers to intake air temp (IAT) sensor 2 --circuit high input===causes --wiring short to positive ---IAT sensor---ECM

Nov 23, 2015 | 1994 Cadillac DeVille

1 Answer

How do I properly install a throttle position sensor on a 1981 Nissan 200sx?


The easiest way to find out about the voltage is to check the other sensors which would be on the same circuit. The engine temp sensor, Oxygen sensor, or MASS air flow sensor would be possible choices. This was one of the first years for fuel injection so the computer is a very simple setup compared to today.
On models built after 1990 the reference voltage is 5 volts. But on early models it could have been more.
Either way, the sensors get their power from the computer.
Normally you would install the TPS and set it at .5 volts with the throttle closed.

Jul 06, 2013 | Cars & Trucks

1 Answer

1995 dodge ram 1500 318 motor it wont get fire where is the logic module located


Under hood,passenger side mounted on the firewall,but ...
Could be something else ,crank sensor or cam,or ign.rotor ect.
The module like 3 hundred bucks.Try this ,turn the key
on-off-on-off-on( without out hitting the starter) the check
engine light should begin to flash.
Here is a code list,may narrow down the problem.
Diagnostic Trouble Code Descriptions and service hints. Fault Code DRB Display Code Description. Service hints. 11 No Crank reference signal at PCM No Distributor reference signal detected during engine cranking. Check the circuit between the distributor and PCM. 12 Battery Disconnect Direct Battery input to PCM disconnected within last 50 ignition key-on cycles. Normal if battery has been disconnected, otherwise check battery power and ground connections. 13** No change in MAP from start to run No difference seen between the engine MAP reading and the barometric (atmospheric) pressure reading at startup. Indicates a problem with the MAP sensor vacuum system. 14** MAP sensor voltage too low or too high MAP sensor voltage output is outside the acceptable range. 15** No Vehicle speed sensor signal No signal received from the vehicle speed sensor during road load operation. 17* Engine is cold too long Engine temperature too high or too low while traveling. Check coolant level, radiator cap, temperature sensor, and thermostat. 21** O2S Stays at center O2S shorted to voltage O2 sensor does not detect rich or lean condition, or O2 sensor input voltage too high. DRB will indicate which side with dual sensors. The O2 sensor signal should fluctuate under normal conditions. 22** ECT sensor voltage too high or too low Engine Coolant temperature sensor input out of normal range. Check engine temperature sensor. 23** Intake air temp sensor voltage too high or low Intake air manifold temperature sensor is out of range. Check sensor. 24** Throttle position sensor voltage too high or low TPS sensor is out of normal range. 25** Idle air control motor circuits A short is detected in one or more of the idle air motor circuits. 27* Injector # control circuit Injector number # output driver circuit does not respond to the control signal. Check the affected circuit. 31** EVAP Solenoid Circuit Short or open in the EVAP solenoid circuit. Check for loose, broken, or shorted wire in the charcoal canister purge solenoid wiring and connectors. 32** EGR Solenoid circuit Short or open in the EGR solenoid circuit. Check for loose, broken, or shorted wire in the EGR valve wiring and connectors. Possible air fuel ratio imbalance not detected during diagnosis. 33* AC clutch relay circuit Short or open in the AC clutch circuit. 34* Speed control circuit or speed control switch always low or high An open or short in the speed control vacuum or vent circuits. Speed control switch input above or below normal range. 35 Radiator Fan low speed relay circuit Open or short in the radiator fan relay wiring. 37** Torque converter clutch solenoid CKT or Trans temp sensor too high or low Open or short in CKT wiring or connectors. Voltage out of range at transmission temperature sensor input. See NOTE #1 below 41** Generator field not switching properly Open or short in the generator (alternator) field control (regulator) circuit. This indicates a problem with the charging circuit and the fault is set when the battery voltage from the ASD relay falls below 11.75 volts. Wiring, connectors, fuses, and the ASD relay should be checked. A shorted battery cell can also trigger this fault. 42* Auto shutdown relay circuit Open or short in the ASD relay wiring or connectors. 43** Ignition coil circuit # Open or short in number # coil circuit. Indicates that the ignition coil's peak primary circuit current is not achieved with the maximum dwell time. 44* Battery temp sensor volts out of range An open or short in the engine coolant temperature sensor circuit or a problem in the PCM's battery temperature circuit. 45* Trans OD solenoid circuit Transmission OD solenoid circuit failure. Open or short in the transmission overdrive solenoid circuit. 46** Charging system voltage too high Battery voltage sense input above target charging voltage during engine operation. Computer is indicating that the battery voltage is not being regulated. 47** Charging system voltage too low Battery voltage sense input above target charging voltage during engine operation. Also, no significant change in battery voltage was detected during a test of the generator output. 51** System lean L-Idle Adap at rich limit or lean R-Idle Adap at rich limit O2 sensor signal indicates lean air/fuel ratio during engine operation. The computer ran the mixture to the rich limit of programming, but the O2 sensor still indicated a lean condition. L or R indicate left or right side O2 sensor. Fuel pressure problems can lean the mixture and set this fault. 52** System rich L-Idle Adap at lean limit or rich R-Idle Adap at lean limit O2 sensor signal indicates rich air/fuel ratio during engine operation. The computer ran the mixture to the lean limit of programming, but the O2 sensor still indicated a rich condition. L or R indicate left or right side O2 sensor. Faulty ignition components, high or low fuel pressure, or leaking injectors can set this fault. 53* Internal PCM failure or PCM SPI comm failure An internal PCM failure or PCM communications failure has been detected. 54* No cam sync signal at PCM No fuel sync (camshaft signal) detected during engine crank. No camshaft position sensor signal was received from the distributor. Problem with the distributor synchronization circuit. 55 N/A End of message code. A DTC 55 is used to end all DTC messages. This code does not show on the DRB tool and indicates a completion of the stored codes on the Malfunction Indicator Lamp (check engine lamp). 62* PCM failure SRI miles not stored Unsuccessful attempt to update Service Reminder Indicator miles in the PCM EEPROM (memory). 63* PCM Failure EEPROM write denied Unsuccessful attempt to write and EEPROM location by the PCM. Controller failure, check the PCM. This code can be set when attempting an unauthorized reprogram of the PCM. 71** Aux 5V signal voltage low The auxiliary 5 volt supply output voltage is low. The 5 volt output signal is not reaching the required voltage level. 72** Catalytic Converter efficiency failure The catalytic converter is not converting emissions in the proper ratio.

Feb 22, 2013 | Cars & Trucks

1 Answer

Dodge 2002 Grand Caravan 3.8L: Problem, OBD code P0135 bad TPS sensor. I have replaced the TPS sensor 3 times and still have the same problem. I tested the wiring on the connector to the TPS and Ground...


DTC P0135: Oxygen Sensor Heater Circuit (Bank 1, Sensor 1)
  1. Sensor or solenoid faulty
  2. Connector terminal contact damaged or corroded
  3. Wire harness fault. Check for correct voltage, open, short to ground or short to voltage
  4. Open fuse
Note: there is no reference to the TPS.

Jun 17, 2017 | Dodge Grand Caravan Cars & Trucks

1 Answer

ECM Trouble shooting


Don't even THINK about replacing the PCM right now. That's way down the list of possibles.The P0102 can be caused by a significant vacuum leak and that would also cause a very high idle speed. Check the air duct that runs from the MAF to the intake. Look for anything that would let in unmetered air. The P0122 is pretty easy to check. Remove the plug from the TPS and measure reference voltage (key in RUN position) on the gray wire. It should be 5V dc. If it's not, backprobe the gray wire right at the PCM at pin 16. You should see 5-volts there. If you do, then you have a wiring issue between the PCM and TPS. The reference voltage is spliced between the PCM and the TPS. The splice provides the 5v to the linear EGR vavle, MAP and fuel tank pressure sensor.

Until you check the reference voltage, you have NO basis to think that the problem is in the PCM.

Oct 13, 2017 | 1996 Buick LeSabre

2 Answers

Need to know "no bus" indicator light on instrument panel....


"No Bus" means the data cable going to the (PCM) computer is unplugged, or the PCM has failed and not able to read the information it is being given.
Sometimes just jiggling the PCM causes the ODO "NO BUS" to come on.
Sometimes a bad crank or cam sensor can cause this as well.

Here is the OFFICIAL checklist for the "NO BUS" condition....

Vehicle: 1998 - 1999 Dodge Durango 3.9L
2000 - 2001 Dodge Durango 4.7L
1998 - 2000 Dodge Durango 5.2L
1998 - 2001 Dodge Durango 5.9L



Symptom: Engine will not start. Gauges are inoperative. No BUS message displayed on odometer.



System: Body/Chassis Electrical, Emissions/PCM/Fuel, Engine Electrical



Codes: N/A



Problem 1 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Crankshaft Position (CKP) Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor. If 5v is not present, unplug the Crankshaft Position (CKP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CKP sensor.



Problem 2 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Camshaft Position (CMP) Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the Camshaft Position (CMP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CMP sensor.



Problem 3 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Manifold Absolute Pressure (MAP) Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5v power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the MAP sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the MAP sensor.



Problem 4 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Throttle Position Sensor (TPS).



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5 volt power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the TPS. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the TPS.



Problem 5 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted wire.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the throttle position sensor (TPS) or manifold absolute pressure (MAP) sensor. If 5v is not present, unplug all sensors that are connected to the 5v power supply and disconnect the PCM. Check if either 5v power supply circuit is shorted to ground using a DVOM. If the circuit is found to be shorted to ground, repair the wire and the cause of the short.



Problem 6 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Governor Pressure Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the large round connector on the driver's side of the transmission. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, remove the transmission pan and check for shorted wiring inside the transmission. If the wiring is OK, replace the Governor Pressure Sensor.


Many times the PCM simply overheats - and changing it will stop the problem.


Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

May 13, 2009 | 1999 Dodge Durango

2 Answers

2000 Ram 1500 4x4 "no bus"


All the modules are connected together to communicate with each other via the PCI bus. It is possible that one of the modules is pulling the bus down. If the vehicle won't start it could be any one of the modules. It will be a process of elimination to find the faulty one by disconnecting them one at a time.

Apr 22, 2009 | 1998 Dodge Ram 1500 4WD

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