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HOMESERVICE MANUALSCHEVROLET2002SILVERADO 1500 HD, RWDREPAIR AND DIAGNOSISELECTRICALSTARTERSTARTING SYSTEMSELF-DIAGNOSTIC SYSTEMDIAGNOSTIC SYSTEM CHECK (ENGINE ELECTRICAL)
2002 Chevrolet Silverado 1500 HD, RWD

Diagnostic System Check (Engine Electrical)

2002 Chevrolet Silverado 1500 HD, RWDSECTION Diagnostic System Check (Engine Electrical)
  1. Did you perform the Battery Inspection/Test? If so, go to next step. If not, go to BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING.
  2. Install a scan tool. Does the scan tool power up? If so, go to step  4 . If not, go to SCAN TOOL DOES NOT POWER UP in BODY CONTROL MODULES.
    3. NOTE: 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 CLASS 2 POWER MODE in the DIAGNOSTIC CIRCUIT CHECK on the scan tool. Rotate the ignition switch through OFF, RUN, and CRANK positions while observing the CLASS 2 POWER MODE on the scan tool. Does the CLASS 2 POWER MODE reading match the ignition switch positions for OFF, RUN and CRANK positions? If so, go to next step. If not, go to POWER MODE MISMATCH in BODY CONTROL MODULES.
    4. NOTE: Lack of communication may be due to 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 ignition, with engine off. Attempt to communicate with each module on the class 2 serial data circuit. If using a Tech 2, obtain this information using the CLASS 2 MESSAGE MONITOR feature. Does the scan tool communicate with any module on the class 2 serial data circuit? If so, go to next step. If not, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES.
    5. NOTE: The symptom list will determine the correct diagnostic procedure to use.
  5. Select the Display DTCs function for each module. If using a Tech 2, use the CLASS 2 DTC CHECK feature in order to determine which modules have DTCs set. 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 next step. If not, go to SYMPTOMS (ENGINE ELECTRICAL)  .
    6. NOTE: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
  6. Does the scan tool display any DTC beginning with "U"? If so, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS. If not, go to next step.
  7. Does the scan tool display any DTC beginning with "P"? If so, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS. If not, go to next step.
  8. Does the scan tool display any DTC beginning with "B"? If so, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES.
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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.