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Home >> Chevrolet >> 2000 >> Chevy Express G2500, Van Cargo Extended, 6.5 F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - Diesel >> Diagnostic Tests >> DTC P0220: Accelerator Pedal Position Sensor 2 Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. If OBD system check has been performed, go to next step. If OBD system check has not been performed, see ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Disconnect APP 2 sensor harness connector. Turn ignition on. Measure voltage between ground and all 5-volt reference circuits at APP sensor harness connector. If voltage on all circuits is less than 4.8 volts, go to step  4. If voltage on all circuits is not less than 4.8 volts, go to next step.
  3. DTC is intermittent. If no additional DTCs are set, see DIAGNOSTIC AIDS . If any additional DTCs are set, perform appropriate DTC test.
  4. Turn ignition off. Disconnect PCM harness connectors. Check for short to ground in 5-volt reference circuits. Repair as necessary. After repairs, go to step  6. If circuits are okay, go to next step.
  5. Replace PCM. Perform PCM relearn procedures. See PROGRAMMING . After repairs, go to next step.
  6. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter DTC P0220. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  7. Using scan tool, check for DTCs. If any undiagnosed DTCs are set, perform appropriate DTC test. If no DTCs are set, system is okay.
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