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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 P1500: Start Switch Circuit >> 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. If MIL is not illuminated, turn ignition off. Restart engine and run for an additional 3 or more minutes. If DTC P1500 is set, go to next step. If DTC P1500 is not set, see DIAGNOSTIC AIDS .
  3. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Place transmission in Neutral. Using DVOM, check voltage at start signal circuit at PCM harness connector. Fully depress clutch pedal and 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 clutch pedal position switch and PCM. 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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