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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 152 (ENGINE CONTROLS SELF-DIAGNOSTICS - 6.5L)DIAGNOSTIC TESTSDTC P1643: WAIT TO START INDICATOR CONTROL CIRCUITDIAGNOSTIC PROCEDURES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Diagnostic Procedures

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Diagnostic Procedures
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: Ensure that both the ON and the OFF states are commanded. Repeat the commands as many times as necessary.
  2. Turn ON the ignition, with the engine OFF. Using a scan tool, command the wait to start lamp ON and OFF. Does the wait to start lamp turn ON and OFF with each command? If yes, go to next step. If no, go to step  4 .
  3. The DTC is intermittent. If no additional DTCs are stored, see DIAGNOSTIC AIDS  . If additional DTCs were stored, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  4. Turn OFF the ignition. Disconnect the PCM connectors. Turn ON the ignition, with the engine OFF. Is the Wait To Start lamp OFF? If yes, go to next step. If no, go to step  7 .
  5. With a fused jumper wire connected to ground, probe the Wait To Start lamp control circuit in the PCM harness connector. Does the Wait To Start lamp illuminate? If yes, go to next step. If no, go to step  8 .
  6. Check the connections at PCM. Repair the conditions as needed. Did you perform a repair? If yes, go to step  11 . If no, go to step  10 .
  7. Repair the Wait To Start control circuit short to ground. After repairs, go to step  11 .
  8. Check the connections at the cluster. Repair the conditions as needed. Did you find and correct the condition? If yes, go to step  10 . If no, go to next step.
  9. Check the Wait To Start circuit for the following conditions:
    • Open ignition feed to the bulb.
    • Malfunctioning bulb.
    • Control circuit open or shorted to battery voltage.

    Repair the conditions as needed. Did you find and correct the condition? If yes, go to step  11 . If no, diagnose instrument panel. See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.

  10. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  11. Using the scan tool, clear the DTCs. Start engine and idle the engine at the normal operating temperature. Select DTC and the Specific DTC function. Enter the DTC number that was set. Operate the vehicle within the Conditions for Setting DTC until the scan tool indicates the diagnostic ran. Does the scan tool indicate the diagnostic passed? If yes, go to next step. If no, go to step  2 .
  12. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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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.