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HOMESERVICE MANUALSCHEVROLET1996CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - G SERIES (6.5L DIESEL)DIAGNOSTIC TROUBLE CODESDTC P0221 - ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUITDIAGNOSTIC PROCEDURES
1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 W

Diagnostic Procedures

1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 WSECTION Diagnostic Procedures
  1. Perform Powertrain On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Using scan tool, with throttle closed, observe APP voltages. APP 1 voltage should be .45-.95 volt. APP 2 voltage should be 4.0-4.5 volts. APP 3 voltage should be 3.6-4.0 volts. If voltages are as specified, go to next step. If voltages are not as specified, go to step 4).
  3. DTC is intermittent. If no additional DTCs are set, see DIAGNOSTIC AIDS. If any additional DTCs are set, go to applicable DTC test.
  4. Turn ignition off. Disconnect APP sensor connector. Turn ignition on, with engine off. Using DVOM, probe 5-volt reference circuits (terminals "G", "D" and "E") of APP sensor connectors to ground. If voltage on all circuits is 4.75 volts, go to next step. If voltage on all circuits is not 4.75 volts, go to step 6).
  5. Turn ignition on, with engine off. Using test light, probe ground circuits (terminals "A", "B" and "J") of APP sensor connectors to battery voltage. If test light illuminates on all circuits, go to step 9). If test light does not illuminate on all circuits, go to step 8).
  6. Turn ignition off. Disconnect PCM connector. Check for open or short to ground in 5-volt reference circuits. Repair as necessary. If open or short to ground was present in 5-volt reference circuits, go to step 11). If open or short to ground was not present in 5-volt reference circuits, go to next step.
  7. Check for poor connections at 5-volt reference terminals of PCM. Repair terminals as necessary. If any terminals were replaced, go to step 11). If no terminals were replaced, go to step 10).
  8. Turn ignition off. Disconnect PCM connector. Check for open in ground circuits. Repair as necessary. If open was present in ground circuits, go to step 11). If open was not present in ground circuits, go to step 10).
  9. Replace APP module. Go to step 11).
  10. Replace PCM. Go to next step.
  11. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0221. 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, repeat step 2).
  12. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.