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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 631 (Engine Controls Diagnosis - 3.4L (DTC P0506 - DTC P1640)) >> Diagnostic Trouble Codes >> DTC P1374 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1374 can be caused by secondary components leaking high voltage into the IC module.

Inspect for the following conditions:

DTC P1374

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views  or  Powertrain Control Module (PCM) Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Attempt to start the engine.
Does the engine start and run?		 Go to Step 4  Go to Step 3 
3
  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. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 Go to Step 4  Go to Diagnostic Aids
4
  1. Turn OFF the ignition.
  2. Disconnect the 6-way ignition control module connector.
  3. Remove the injector fuse.
  4. Turn ON the ignition, with the engine OFF.
  5. Momentarily probe the low resolution engine speed signal circuit at the ignition module harness connector with a test lamp connected to B+.
  6. Observe the Engine Speed parameter with a scan tool.
Is an Engine Speed displayed?		 Go to Step 8  Go to Step 5 
5 Did the test lamp illuminate? Go to Step 7  Go to Step 6 
6
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the low resolution engine speed signal circuit of the ignition control module for the following conditions:
    • An open
    • A short to voltage
    • High resistance
Refer to Wiring Repairs and Circuit Testing in Wiring Systems.Did you find and correct the condition?		 Go to Step 12  Go to Step 9 
7
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Test the low resolution engine speed signal circuit of the ignition control module for a short to ground or high resistance. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 9 
8 Test for an intermittent and for a poor connection at the ignition control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 10 
9 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 11 
10 Replace the ignition control module. Refer to Ignition Control Module Replacement .
Did you complete the replacement?		 Go to Step 12  -
11 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 Go to Step 12  -
12
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 13 
13 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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