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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System - 4.3L (DTC P0171 To DTC P0507)) >> Diagnosis >> DTC P0351 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if the DTC is an intermittent.
  2. 3:  This step verifies if the IC timing signal from the PCM is available at the ignition control module.
DTC P0351

Step Action Values 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 - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Clear the DTCs with a scan tool.
  2. Disconnect the injector harness connector.
  3. Crank the engine for 15 seconds.
Does DTC P0351 set?		 - Go to Step 3  Go to Intermittent Conditions
3 
  1. Turn OFF the ignition.
  2. Connect the injector harness connector.
  3. Disconnect the ignition control module (ICM).
  4. Probe the ignition control (IC) timing control circuit of the ICM harness connector with a DMM that is connected to a good ground.
  5. Crank the engine.
  6. Observe the AC voltage on the DMM.
Does the voltage measure within the specified range?		 1-4 V Go to Step 4  Go to Step 6 
4
  1. Turn OFF the ignition.
  2. Probe the ground circuit of the ICM harness connector with a test lamp connected to battery voltage.
Does the test lamp illuminate?		 - Go to Step 5  Go to Step 11 
5
  1. Turn ON the ignition, with the engine OFF.
  2. Probe the ignition 1 voltage circuit of the ICM harness connector with a test lamp connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 10  Go to Step 14 
6
  1. Turn OFF the ignition.
  2. Disconnect the powertrain control module (PCM).
  3. Probe the IC timing control circuit of the PCM harness connector with a test lamp connected to battery voltage.
Does the test lamp illuminate?		 - Go to Step 12  Go to Step 7 
7 Test for an open in the IC timing control circuit between the PCM and the ICM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 8 
8
  1. Connect the PCM.
  2. Turn ON the ignition, with the engine OFF.
  3. Probe the IC timing control circuit at the ICM harness connector with a DMM set to the DC scale and connected to a good ground.
Does the voltage measure more than the specified value?		 1 V Go to Step 13  Go to Step 9 
9 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections or Connector Repairs in Wiring Systems.
Does you find and correct the condition?		 - Go to Step 17  Go to Step 16 
10 Test for an intermittent and for a poor connection at the ICM. 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 17  Go to Step 15 
11 Repair the open in the ground circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 17  -
12 Repair the short to ground in the IC timing control circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 17  -
13 Repair the short to voltage in the IC timing control circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 17  -
14 Repair the open in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 17  -
15 Replace the ICM. Refer to Ignition Control Module Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the engine control module (ECM)/PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  -
17
  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 18 
18 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
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