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Home >> Cadillac >> 2002 >> Eldorado ETC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P1372: Crankshaft Position Sensor Circuits Performance >> Diagnostic Procedures

Diagnostic Procedures

  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. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, monitor the specific DTC information for DTC P1372. Does the DTC fail this ignition cycle? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the scan tool indicate that the DTC passed? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  4. Leave the scan tool installed. Turn ON the ignition, with the engine OFF. Command Time Mode B using the scan tool. See PROCEDURES FOR SELECTING CRANK POSITION SENSING DECODE MODE . Start engine. Raise the vehicle. Wiggle the harnesses and connectors related to CKP sensor B. With the scan tool, monitor the Specific DTC Information for DTC P0386. Does the scan tool indicate that DTC P0386 failed last test? If yes, see DTC P0386: CRANKSHAFT POSITION SENSOR B CIRCUIT PERFORMANCE . If no, go to next step.
  5. Leave the scan tool installed. Turn ON the ignition, with the engine OFF. Command Time Mode A using the scan tool. See PROCEDURES FOR SELECTING CRANK POSITION SENSING DECODE MODE . Start engine. Raise the vehicle. Wiggle the harnesses and connectors related to CKP sensor A. With the scan tool, monitor the Specific DTC Information for DTC P0336. Does the scan tool indicate that DTC P0336 failed last test? If yes, see DTC P0336: CRANKSHAFT POSITION SENSOR A CIRCUIT PERFORMANCE . If no, go to next step.
  6. Clear the DTCs with a scan tool. Turn OFF the ignition. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  7. 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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