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Home >> Cadillac >> 2003 >> CTS Automatic >> Repair and Diagnosis >> Electrical >> Starter >> Starting System >> Self-Diagnostic System >> Engine Electrical Diagnostic System Check

Engine Electrical Diagnostic System Check

  1. If the Battery Inspection/Test was performed, go to next step. If the Battery Inspection/Test was not performed, go to BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING in GENERATORS & REGULATORS - CTS article in CHARGING SYSTEM in ELECTRICAL.
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. If the scan tool powers up, go to next step. If the scan tool does not power up, go to appropriate BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    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 all positions while observing the Class 2 Power Mode parameter. If the ignition switch parameter reading matches the ignition switch position for all switch positions, go to next step. If the ignition switch parameter reading is not as specified, go to appropriate BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    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 following step 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:
    • Amplifier (AMP)
    • Climate Control Panel (CCP)
    • Dash Integration Module (DIM)
    • Instrument Panel Cluster (IPC)
    • Onstar (ONS)
    • Radio (IRC)
    • Rear Integration Module (RIM)
    • Remote Function Actuator (RFA)
    • Engine Control Module (ECM)
    • Supplemental Inflatable Restraint (SIR)
    If the scan tool communicates with all modules on the class 2 serial data circuit, go to next step. If the scan tool does not communicate with all modules on the class 2 serial data circuit, go to appropriate BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
  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. If the scan tool displays any DTCs, go to next step. If the scan tool does not display any DTCs, go to ENGINE ELECTRICAL SYMPTOMS  under TROUBLE SHOOTING.
    NOTE: The presence of DTCs which begin with a "U" indicate some other module is not communicating. The following step will collect all the available information before you perform tests.
  6. If the scan tool displays any DTCs which begin with a "U", go to appropriate BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If the scan tool does not display any DTCs which begin with a "U", go to next step.
  7. If the scan tool displays DTC B1000, B1004, B1007, B1009, B1013 or B1014, go to appropriate BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If the scan tool does not display the specified DTCs, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  table.
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