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Home >> GMC >> 1996 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - P Series (6.5L Diesel) >> Diagnostic Trouble Codes >> DTC P0216 - Injection Timing Control System >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform Powertrain On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Install scan tool. Start and warm engine to normal operating temperature. Scan injection timing at idle and at 1500 RPM using scan tool. If scan tool displays a difference of 5 degrees between actual and desired injection time at idle and at 1500 RPM, go to next step. If scan tool does not displays a difference of 5 degrees between actual and desired injection time at idle and at 1500 RPM, 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 PCM connector. Using DVOM, check resistance between coil 1 low and coil 1 high circuits of PCM connector. If resistance is 10-60 ohms, go to next step. If resistance is not 10-60 ohms, go to step 9).
  5. Using DVOM, check resistance between coil 2 low and coil 2 high circuits of PCM connector. If resistance is 10-60 ohms, go to next step. If resistance is not 10-60 ohms, go to step 10).
  6. Reconnect PCM connector. Disconnect injection timing stepper motor. Start and idle engine. Using scan tool, command time set on. Using DVOM, check for a varying voltage between ground and each terminal of injection timing stepper motor connector. If voltage varies, go to next step. If voltage does not vary, go to step 12).
  7. Disconnect crankshaft position sensor. Using DVOM, check resistance between crankshaft position sensor signal circuit and 5-volt reference circuit of crankshaft position sensor pigtail. If resistance is 950-1050 ohms, go to next step. If resistance is not 950-1050 ohms, go to step 15).
  8. Check if injection timing is set correctly. Check for a sheared camshaft driven key. Repair as necessary. If a problem was found, go to step 18). If a problem was not found, go to step 16).
  9. Turn ignition off. Disconnect PCM connector. Check for open in coil 1 low and coil 1 high circuits. Repair as necessary. If a problem was found, go to step 18). If a problem was not found, go to step 16).
  10. Turn ignition off. Disconnect PCM connector. Check for open in coil 2 low and coil 2 high circuits. Repair as necessary. If a problem was found, go to step 18). If a problem was not found, go to step 16).
  11. Check for poor connections at injection timing stepper motor. Repair terminals as necessary. If any terminals were replaced, go to next step. If no terminals were replaced, go to step 17).
  12. Check for short to ground in any injection timing stepper motor circuits or for poor connections at PCM. Repair as necessary. If a problem was found, go to step 18). If a problem was not found, go to step 17).
  13. Check for short to ground in crankshaft position sensor pigtail. Repair as necessary. If a problem was found, go to step 18). If a problem was not found, go to next step.
  14. Check for poor connection and repair terminals as necessary. If terminal was replaced, go to step 18). If terminal was not replaced, go to step 17).
  15. Replace crankshaft position sensor. Go to step 18).
  16. Replace fuel injection pump. If fuel injection pump is replaced, new pump must be timed. See appropriate ADJUSTMENTS article. Go to step 18).
  17. Replace PCM. Go to next step.
  18. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0216. 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).
  19. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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