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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls - Tests W/Codes - 6.5L Diesel (P Series)) >> Diagnostic Trouble Codes >> DTC P0220 - Accelerator Pedal Position (App) Sensor 2 Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform Powertrain ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. Then go to next step.
  2. Turn ignition off. Disconnect APP sensor connector. Turn ignition on, with engine off. Using DVOM, check voltage between ground and 5-volt reference circuits (terminals "D", "E" and "G") of APP sensor connectors. 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, go to applicable DTC test.
  4. Turn ignition off. Disconnect PCM harness connector. Check for short to ground in 5-volt reference circuits. Repair as necessary. If short to ground was present in 5-volt reference circuits, go to step 6). If short to ground was not present in 5-volt reference circuits, go to next step.
  5. Replace PCM. After replacing PCM, go to next step.
  6. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, 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, repeat step 2).
  7. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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