Question about 1995 GMC Jimmy

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Intermittent no start condition. Sometimes DTC P1351 will set. ( "EST output high or pulses detected when open.") Unable to locate short or open in circuit between VCM-A and Ignition Control Module. Suggestions?

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This can be caused by ground cell 14. Not sure where it is on this model. But it is a bad ground.
There are alot of problems with extended crank times causing a false P1351 to set. Does your vehicle require long crank times to start? If so, the code may be a "false" code.
Install your fuel pressure gauge and check the pressure. It should hold with the key off. If it doesn't hold, then you'll need to check for a leaking injector causing a rich condition which would require a long crank time to clear out the excess fuel(which sets the code intermittently) before the engine willl start. It's possible for the fuel pressure regulator to leak only when the engine is running. I've personally experienced that. Start with fuel pressure.
If fuel pressure is good and pressure regulator is working, check signal from crankshaft position sensor to ignition module.
Also check fuel pump connector. They can have the redisign and be faulty and will require a new connector

Posted on May 16, 2010

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Where is fuel pump harness on a 2000 escalade


DTC P1351 Ignition Coil Control Circuit High Voltage
The enhanced ignition system uses the crankshaft position (CKP) sensor in order to provide a timing input to the control module. Ignition control (IC) spark timing for each cylinder is based on this input. The control module provides the ignition timing signal to the ignition control module (ICM) to control the ignition coil. Each timing pulse detected by the ICM allows it to energize the ignition coil. A large secondary ignition voltage is induced in the secondary coil by the primary coil. This high voltage is switched to the correct spark plug by the distributor.
This diagnostic trouble code (DTC) will set if the VCM- (vehicle control module ) detects an unusually high voltage on the ignition timing signal circuit.
Diagnostic Aids
Intermittent test -- If the connections and the harness check OK, monitor a digital voltmeter connected between VCM terminal C3 pin 9 and C4 pin 18 while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change. This may help to isolate the location of the malfunction.
An intermittent may be caused by any of the following conditions:
?€¢
A poor connection

?€¢
Rubbed through wire insulation

?€¢
A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Check out this guy's video on GM fuel pump electrical circuit diagnosis !

GM Fuel Pump Relay Testing

Apr 21, 2016 | Cars & Trucks

2 Answers

2003 GMC duramax 3500 has codes p0370 u1800 p0489 p0404 p0089 p0101 wont start


Hey Ernie Rutherford,

I wasn't convinced until I got to your last p101 air mass
(missing the classic oxy sensor... but that's okay)

((not EVERY sensor need be tripped)).

The engine can't run if the exhaust is blocked.

I've had two... one catalytic converter & a muffler (stumped pretty good... until I managed to blow-up the muffler... then I could finally drive home.

Not elegant but it worked...

All these years I've tried to devise an elegant test. Never succeeded (penetrating oil is as pretty as it gets)..

Open the exhaust system... if it starts... immediately shut it down... cool air on hot valves can be costly.

Good luck.

Apr 07, 2016 | GMC Cars & Trucks

1 Answer

P0753, p0758 and p91860 what's my problem and how do I fix it?


Your best bet would be to take your vehicle to a ASE certified professional . You do not have the tools to diagnose this or the information.
DTC P0753
The 1-2 shift solenoid (1-2 SS) valve controls transmission fluid pressure acting on the 1-2 shift valves to position the valves for the appropriate gear. The 1-2 SS valve is a normally-open exhaust valve located on the control valve body. A fused circuit supplies ignition voltage to the 1-2 SS valve. The PCM commands the solenoid ON or OFF by switching the ground path. When the 1-2 SS valve is commanded ON, the PCM senses low voltage. When the 1-2 SS valve is commanded OFF, the PCM senses high voltage. Refer to Shift Solenoid Valve State and Gear Ratio .
If the PCM detects a continuous open, short to ground or short to power in the 1-2 SS valve circuit, then DTC P0753 sets. DTC P0753 is a type B DTC.
DTC P0753 sets when one of the following conditions occurs for 5 seconds:
Condition 1 The PCM commands the solenoid ON and voltage feedback remains high, B+.
Condition 2 The PCM commands the solenoid OFF, and the voltage feedback remains low, 0 volts.
DTC P0758
The 2-3 shift solenoid (2-3 SS) valve controls transmission fluid pressure acting on the 1-2 and 2-3 shift valves to position the valves for the appropriate gear. The 2-3 SS valve is a normally-open exhaust valve located on the control valve body. A fused circuit supplies ignition voltage to the 2-3 SS valve. The PCM commands the solenoid ON or OFF by switching the ground path. When the 2-3 SS valve is commanded ON, the PCM senses low voltage. When the 2-3 SS valve is commanded OFF, the PCM senses high voltage. Refer to Shift Solenoid Valve State and Gear Ratio .
If the PCM detects a continuous open, short to ground or short to power in the 2-3 SS valve circuit, then DTC P0758 sets. DTC P0758 is a type A DTC.
Conditions for Setting the DTC
DTC P0758 sets when one of the following conditions occurs for 5 seconds:
Condition 1 The PCM commands the solenoid ON and the voltage feedback remains high, B+.
Condition 2 The PCM commands the solenoid OFF and the voltage feedback remains low, 0 volts.
What's this p91860 , no such code .

Apr 02, 2016 | 2003 Pontiac Aztek

2 Answers

How to reset Theft Deterrent fuel enable signal


have you put obd11 scanner on it to find error code.
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
Circuit Description
The Vehicle Theft Deterrent (VTD) system is incorporated within the body control module (BCM). The powertrain control module(PCM) monitors the state of health serial data message from the Theft Deterrent system to ensure that the PCM to BCM communications is established. If the PCM detects a loss of the state of health message while the engine is running, DTC P1626 will set. DTC P1626 can cause a no-start condition or normal operation depending on when the loss of Theft Deterrent system communication was detected. The engine will continue to start and run if the condition that set DTC P1626 occurred after the PCM received a valid theft deterrent password from the BCM and already allowed fuel during the ignition cycle. The engine will start and immediately stall if the condition that set DTC P1626 occurred before the PCM received a valid theft deterrent password. With this condition present, the PCM will inhibit fuel delivery and disable the starter until a valid theft deterrent password is detected. Refer to Content Theft Deterrent (CTD) Circuit Description .

Conditions for Running the DTC
The Theft Deterrent system has allowed fuel delivery.
Conditions for Setting the DTC
The PCM has detected a loss of the state of health serial data message from the Theft Deterrent system.

Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 40 malfunction free warm-up cycles.
The PCM receives a clear code command from the scan tool.
Diagnostic Aids,
An intermittent may be caused by:

• A poor connection

• Rubbed through wire insulation

• A wire broken inside the insulation

Check for the following conditions:, • Intermittent short circuit on the serial data circuit -- Refer to Data Link Communications Operation in Data Link Communications. Be sure to check all related wiring for an intermittent short to ground or short to voltage.

• Poor connection -- Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harness related to the BCM, including the ignition, battery feed, ground, and Serial Data circuits.

Mar 13, 2016 | 2001 Buick Park Avenue

1 Answer

How do fix PO660 code for 2003 Mazda MPV


DTC P0660: INTAKE MANIFOLD COMMUNICATION CONTROL CIRCUIT - MALFUNCTION

Detection Condition

DTC is set, when PCM detects Intake Manifold Communication Control (IMCC) actuator input voltage remains too low or too high. This is an intermittent monitor. MIL does not illuminate.

Possible Causes
Connector terminal malfunction.
IMCC actuator malfunction.
Open circuit between IMCC actuator harness connector and main relay.
PCM malfunction.
Short or open circuit between IMCC actuator and PCM harness connectors.

Feb 03, 2016 | Mazda Cars & Trucks

1 Answer

How to fix a p1599 and a p1640 on my 2001 Saturn lw200


DTC P1599 will set if the PCM has detected an engine stall condition when:
?€¢
The engine is in run mode.


?€¢
Ignition voltage is present on circuit 839.


?€¢
The CKP signal at PCM is NOT detected.

DTC P1599 is a type D DTC
The PCM has the ability to set a diagnostic trouble code (DTC) if the engine stalls when the ignition has NOT been turned OFF. This DTC may aid in intermittent diagnosis of a customer complaint of intermittent engine stall. The scan tool Failure Record information can be duplicated under the same stall conditions in an attempt to reproduce the occurrence. Since DTC P1599 is a type D DTC, the PCM will not command the MIL or SERVICE telltale ON. This DTC can set due to driver error. For example, a vehicle equipped with a manual transaxle in which the clutch was released too quickly causing the engine to stall.
DTC P1640 (PCM Output Circuit)
The PCM contains an output driver module (ODM) which controls 7 circuits: A/C relay, air pump relay, EVAP purge solenoid, EVAP vent solenoid, fan control 1, fan control 2, and TCC solenoid. The ODM controls each of these circuits independently by controlling the circuit ground. The ODM monitors the voltage level at each of the 6 circuits into the PCM when the device is being commanded ON or OFF. When the device is commanded OFF, the circuit is not grounded, the voltage level at the PCM should be high (ignition voltage). When the device is commanded ON, the circuit is grounded, the voltage level at the PCM should be low. Each of the 7 drivers in the ODM contains a feedback circuit used to determine if a particular circuit failed, which can be read on the scan tool. DTC P1640 sets when any one of the 7 feedback voltages is low when that device is turned OFF or when any one of the 7 feedback voltages is high when that device is turned ON when the engine is running.
Sounds to me like you have a short on one of these circuits !
To locate an intermittent problem, use the scan tool to command each of the 7 solenoids tied to the ODM circuit ON and OFF independently while monitoring:
A/C RELAY CKT OPEN SHORT TO GND
A/C RELAY CKT SHORT TO VOLTS
OR
AIR PUMP REL. CKT OPEN SHORT TO GND
AIR PUMP REL. CKT SHORT TO VOLTS
OR
EVAP PURGE CKT OPEN SHORT TO GND
EVAP PURGE CKT SHORT TO VOLTS
OR
EVAP VENT CKT OPEN SHORT TO GND
EVAP VENT CKT SHORT TO VOLTS
OR
FC 1 RELAY CKT OPEN SHORT TO GND
FC 1 RELAY CKT SHORT TO VOLTS
OR
FC 2 RELAY CKT OPEN SHORT TO GND
FC 2 RELAY CKT SHORT TO VOLTS
OR
TCC DUTY CYCLE OPEN SHORT TO GND
TCC DUTY CYCLE SHORT TO VOLTS
If IGN 3 fuse is open, A/C RELAY CKT OPEN SHORT TO GND, EVAP VENT CKT OPEN SHORT TO GND, and EVAP PURGE CKT OPEN SHORT TO GND parameters on the scan tool will read YES.
Do you have a DVOM - digital volt ohm meter ? You need to check each wire in the above circuits for a short to ground or B+ !

Sep 30, 2015 | Saturn Cars & Trucks

1 Answer

P1114 vw passat


DTC P1114Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor, that measures the temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance lowers. With high sensor resistance, the PCM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the ECT signal circuit. If the PCM detects an excessively low ECT signal voltage, which is a high temperature indication, DTC P1114 sets.
Conditions for Running the DTC

The engine run time is more than 5 seconds.
Conditions for Setting the DTC

The PCM detects an intermittent high ECT sensor temperature while the engine is running, and the run time exceeds 5 seconds.
Action Taken When the DTC Sets

Conditions for Clearing the DTCDiagnostic AidsTest Description

The number below refers to the step number on the diagnostic table.

  1. If there are no driveability complaints associated with this DTC, and if the DTC does not reset, the system is OK.
Step
Action
Yes
No
Schematic Reference:
Engine Controls Schematics
1
Did you perform the Diagnostic System Check-Engine Controls?
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
  1. Install a scan tool.
  2. Turn ON the ignition.
  3. Start the engine.
Does the scan tool indicate that DTC P0117 also failed?
Go to DTC P0117
Go to Step 3
3
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the sensor connector and the PCM connector.
Does the scan tool indicate an abrupt change in value?
Go to Step 6
Go to Step 4
4
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the wiring harness at the sensor and the PCM.
Does the scan tool indicate an abrupt change in value?
Go to Step 7
Go to Step 5
5
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC, or within the parameters observed in the Freeze Frame/Failure Records.
Does the DTC reset ?
Go to Diagnostic Aids
System OK
6
Repair the connector or terminal as necessary. Refer to Circuit Testing , and to Connector Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
7
Repair the harness or wiring as necessary. Refer to Circuit Testing , and to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
Go to Step 2
Go to Step 9
9
With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
Go to Diagnostic Trouble Code (D

Nov 04, 2012 | Cars & Trucks

1 Answer

CODE PO372


Hi,

The distributor ignition system supplies two timing inputs to the PCM, a high resolution signal (180 pulses per one crankshaft revolution) and a low resolution signal (4 pulses per one crankshaft revolution). The high resolution and low resolution circuits toggle between 0 and 5 volts as the camshaft turns. The PCM can determine if one of the timing inputs is not being received by comparing the two inputs.
The following malfunctions to the high resolution circuit will cause a DTC P0372 to set:
• An open. • A short to voltage. • A short to ground. • A defective ignition module within the distributor. Conditions for Setting the DTC • The PCM detects low resolution pulses but no high resolution pulses. Action Taken When the DTC Sets • The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails. • The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and/or Failure Records. • The injector will be disabled for the entire ignition cycle. Conditions for Clearing the MIL/DTC • The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail. • A last test failed (Current DTC) will clear when the diagnostic runs and does not fail. • A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. • PCM battery voltage is interrupted. • Using a Scan tool. Diagnostic Aids • If DTC P1351 and/or DTC P1361 is also set with a DTC P0372, and no external fault can be found, replace the PCM. If only DTC P0372 is set and the distributor connections are OK, replace the distributor. • If distributor components must be replaced, check distributor vent system operation.
Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jun 30, 2011 | 1996 Chevrolet Impala SS

1 Answer

I have a 2001 caddy deville that i am buying there is a code that comes up P1860 can you tell me what that is Thank you Paul


Circuit Description with 4T80-E Automatic Transaxle
Ignition voltage is provided to the torque converter clutch pulse width modulated (TCC PWM) solenoid valve. The PCM controls the ON and OFF time of the solenoid by providing a ground through the output driver module (ODM) . The PCM uses a PWM duty cycle, in order to control application and release of the TCC. When the solenoid is commanded OFF, the PCM senses high volts. When the solenoid is commanded ON, the PCM senses low volts. If the PCM detects a continuous open, short to ground or short to voltage in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type B DTC.

Conditions for Running the DTC
  • The system voltage is 8-18 volts
  • The engine run time is greater than 5 seconds.
  • The TCC PWM solenoid valve duty cycle is 10% or less or 90% or greater.
Conditions for Setting the DTC
The TCC PWM solenoid valve feedback circuit indicates a continuous open, short to ground or short to voltage for 4.3 seconds.

Sep 23, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

Trouble codes


Trouble Code: P0139
O2 (B1 S2) Slow Response
Trouble Code Conditions:Engine started; vehicle driven at 20-55 mph with the throttle open for 2 minutes; ECT at more than 158ºF (70C); catalytic converter temperature is more than 1112F (600C); and EVAP purge is active. O2 Sensor signal voltage switches less than 16 times from lean to rich within 20 seconds during monitoring, or will compare the state of change between the front and rear O2 Sensors and if the differences are greater than a calibrated amount, the DTC will set. 3 good trips are required to turn off the MIL.
Possible Causes:
  • Exhaust leak
  • O2 element is contaminated, deteriorated or it has failed
  • O2 signal circuit or return circuit has failed

Trouble Code: P0344
Camshaft Position Sensor Circuit Intermittent
Trouble Code Conditions:Engine cranking or running; system voltage over 10.5v. The PCM detected an intermittent loss of the CMP Sensor signal during the period of 2.5 complete engine revolutions. The failure counter must reach 20 before this code matures and a code is set.
Possible Causes:
  • Wiring harness fault
  • 5v supply circuit open or shorted to ground
  • Tone wheel/pulse ring is damaged or corroded
  • CMP Sensor has failed
  • CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5v supply
  • CMP Sensor ground circuit is open
  • PCM has failed
  • Trouble Code: P0340
    No Camshaft Position Sensor Circuit Failure
    Trouble Code Conditions:Engine cranking or running, system voltage over 10v. The PCM detected CKP pulses without detecting any CMP Sensor pulses for 5 seconds or 2.5 engine revolutions.
    Possible Causes:
  • CMP Sensor connector is damaged, open or it is shorted
  • CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit
  • CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage
  • CMP Sensor ground circuit is open
  • CMP Sensor is damaged or has failed
  • CKP Sensor is damaged or has failed
  • PCM has failed
Good luck....

Nov 05, 2008 | 2005 Chrysler PT Cruiser

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