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Home >> Chevrolet >> 2000 >> Tracker 4D Utility, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P1510: Pcm Backup Power Supply >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, clear DTCs. Start engine and run for 3 or more minutes. Restart engine and run for an additional 3 or more minutes as necessary. Recheck DTCs. If DTC resets, go to next step. If DTC does not reset, see DIAGNOSTIC AIDS .
  3. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Place transmission in Park (A/T) or Neutral (M/T). Using DVOM, check voltage at start signal circuit at PCM harness connector. Crank engine. Check voltage at start signal circuit at PCM harness connector while cranking engine. If voltage reading is zero volts with ignition on and 6-12 volts with engine cranking, go to step  5. If voltage reading is not zero volts with ignition on and 6-12 volts with engine cranking, go to next step.
  4. Repair open or short in start signal circuit between PCM and transmission range switch (A/T) or clutch pedal position switch (M/T). After repairs, go to step  7.
  5. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  7. If connections are okay, go to next step.
  6. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  7. After repairs, clear DTCs. Operate vehicle within FREEZE FRAME conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose DTC(s).
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