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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.3L)DIAGNOSTIC TESTSDTC P0351: IGNITION CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Diagnostic Procedures

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, clear DTCs. Disconnect injector harness connector. Crank engine for 15 seconds. If DTC P0351 sets, go to next step. If DTC P0351 does not reset, see INTERMITTENT TROUBLE CODE DETERMINATION  under ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.
  3. Turn ignition off. Reconnect injector harness connector. Disconnect ICM connector. See COMPONENT LOCATIONS . Using DVOM set to AC volts, probe ICM connector terminal "B" (White wire). See Fig 1. Crank engine. Observe voltage. If voltage is 1-4 volts, go to next step. If voltage is not 1-4 volts, go to step  6.
  4. Turn ignition off. Using a test light connected to battery voltage, probe ICM connector terminal "C" (Black wire). If test light is on, go to next step. If test light is off, go to step  10.
  5. Turn ignition on, engine off. Using test light connected to ground, probe ICM connector terminal "A" (Pink wire). If test light is on, go to step  14. If test light is off, go to step  13.
  6. Turn ignition off. Disconnect PCM connector. Using a test light connected to battery voltage, probe PCM Red connector C2 terminal No. 26 (White wire). If test light is on, go to step  11. If test light is off, go to next step.
  7. Turn ignition off. Check White wire between ICM and PCM for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  8. Reconnect PCM connector. Turn ignition on, engine off. Using a DVOM set to DC volts, measure voltage between ICM connector terminal "B" (White wire) and ground. If voltage is more than one volt, go to step  12. If voltage is not more than one volt, go to next step.
  9. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to step  15.
  10. Repair open in Black wire between ICM and ground. After repairs, go to step  16.
  11. Repair short to ground in White wire between ICM and PCM. After repairs, go to step  16.
  12. Repair short to voltage in White wire between ICM and PCM. After repairs, go to step  16.
  13. Repair open in Pink wire between ICM and underhood junction block. After repairs, go to step  16.
  14. Replace ICM. After repairs, go to step  16.
  15. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  16. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  17. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
Fig 1: Identifying Idle Air Control Valve Connector Terminals ("C" & "K" Series) & Ignition Control Module Connector Terminals ("C", "G" & "K" Series)
G00057690Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.