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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 5.0L & 5.7LDIAGNOSTIC TESTSDTC P0341: CAMSHAFT POSITION SENSOR CIRCUIT PERFORMANCEDIAGNOSTIC 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
  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. Install scan tool. Start engine. Using scan tool, monitor CAM signal input high-to-low and low-to-high transition parameter. If scan tool parameter increments, go to next step. If scan tool parameter does not increment, go to step  4.
  3. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria or as close to FREEZE FRAME/FAILURE RECORDS data as possible. If DTC failed this ignition cycle, go to next step. If DTC did not fail this ignition cycle, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect CMP sensor connector. See COMPONENT LOCATIONS . Turn ignition on, engine off. Connect a DVOM between CMP sensor terminal "C" (Red wire) and ground. See Figure. If voltage is about battery voltage, go to step  6. If voltage is not about battery voltage, go to next step.
  5. Turn ignition off. Disconnect PCM connectors. Check Red wire between CMP sensor and PCM for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to step  12.
  6. Using a test light connected to battery voltage, touch CMP sensor connector terminal "A" (Pink/Black wire). If test light is on, go to step  8. If test light is off, go to next step.
  7. Turn ignition off. Disconnect PCM connectors. Check Pink/Black wire between CMP sensor and PCM for open or high resistance. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to step  12.
  8. Start engine. Using scan tool, monitor CAM signal high-to-low and low-to-high parameter. Connect a fused jumper wire (5-amp) to battery voltage and monetarily touch CMP sensor connector terminal "B" (Brown/White wire) 5 times for a duration of one second each. If cam signal high-to-low and low-to-high parameter changes each time signal circuit is touched, go to step  14. If cam signal high-to-low and low-to-high parameter does not change each time signal circuit is touched, go to next step.
  9. If fuse in jumper wire opens, go to step  11. If fuse in jumper wire does not open, go to next step.
  10. Check Brown/White wire between CMP sensor and PCM for short to voltage, open or high resistance. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to step  12.
  11. Check Brown/White wire between CMP sensor and PCM for short to ground. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to step  12.
  12. 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 next step.
  13. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to step  16.
  14. Check CMP connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  15. Replace CMP sensor. 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.
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.