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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 414 (STARTING SYSTEM)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC SYSTEM CHECK (ENGINE ELECTRICAL)
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Diagnostic System Check (Engine Electrical)

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Diagnostic System Check (Engine Electrical)
WARNING: This page is about a different car, the 2003 Buick Regal, 2003 Buick Century, 2002 Buick Regal, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the Battery Inspection/Test. See BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING in STARTING & CHARGING SYSTEMS under CHARGING SYSTEMS in ELECTRICAL. Does the battery pass the test? If so, go to step  2 .
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool power up? If so, go to step  3 . If not, go to appropriate BODY CONTROL MODULES article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    3. CAUTION: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  3. Access the Ignition Switch parameter in the body control module (BCM) inputs data display list. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? If so, go to step  4 . If not, go to appropriate BODY CONTROL MODULES article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    4. NOTE: Lack of communication may be because of a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  4. Turn ON the ignition, with the engine OFF. Attempt to communicate with each of the following modules on the class 2 serial data circuit: Body Control Module (BCM), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). Does the scan tool communicate with all modules on the class 2 serial data circuit? If so, go to step  5 . If not, go to appropriate BODY CONTROL MODULES article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    5. NOTE: The symptom list in system tests will determine the correct diagnostic procedure to use. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. Select the Display DTCs function for the BCM, IPC, and PCM. Record all of the displayed DTCs, the DTC status, and the module which set the DTC. Does the scan tool display any DTCs? If so, go to step  6 . If not, go to SYMPTOM INDEX  table under SYSTEM TESTS.
    6. NOTE: The presence of DTCs which begin with a "U" indicate some other module is not communicating. The specified procedure will collect all the available information before you perform tests.
  6. Does the scan tool display any DTCs which begin with a "U"? Go to appropriate BODY CONTROL MODULES article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If not, go to step  7 .
  7. Does the scan tool display DTC B1000, B1004, B1007, or B1009? If so, go to appropriate BODY CONTROL MODULES article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If not, go to DIAGNOSTIC TESTS  .
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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.