LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2005 >> DeVille Protection Series >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P1121 To P1624) >> Diagnostic Information & Procedures >> DTC P1372 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  In time based B mode, the PCM uses CKP sensor B in order to determine the engine position. An intermittent problem with CKP sensor B and/or related harnesses/connectors will set DTC P0386.
  2. 5:  In time based A mode, the PCM uses CKP sensor A in order to determine the engine position. An intermittent problem with CKP sensor A and/or related harnesses and connectors will set DTC P0336.
DTC P1372

Step Action Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Start the engine.
  2. Allow the engine to reach normal operating temperature.
  3. Observe the DTC information parameter with the scan tool.
Does the DTC fail this ignition?		 Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 4  Go to Diagnostic Aids
4 
  1. Turn ON the ignition, with the engine OFF.
  2. Command Time Mode B using the scan tool. Refer to Procedures for Selecting Crank Position Sensing Decode Mode in Diagnostic Aids.
  3. Start engine.
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Wiggle the harnesses and connectors related to crankshaft position (CKP) sensor B.
  6. Observe the DTC Information parameter with the scan tool.
Does the scan tool indicate that DTC P0386 failed last test?		 Go to DTC P0386 Go to Step 5 
5 
  1. Turn ON the ignition, with the engine OFF.
  2. Command Time Mode A using the scan tool. Refer to Procedures for Selecting Crank Position Sensing Decode Mode in Diagnostic Aids.
  3. Start engine.
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Wiggle the harnesses and connectors related to CKP sensor A.
  6. Observe the DTC Information parameter with the scan tool.
Does the scan tool indicate that DTC P0336 failed last test?		 Go to DTC P0336 Go to Step 6 
6
  1. Lower the vehicle.
  2. Clear the DTCs with a scan tool.
  3. Turn OFF the ignition for 30 seconds.
  4. Start the engine.
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 7  Go to Diagnostic Aids
7 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
scientia non olet · About LEMON Manuals