LSS V6-3.8L VIN K (1997)
Powertrain Control Module: Service and Repair
Crankshaft Position System Variation Learn Procedure
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been
performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in
the PCM, DTC P0300 may set (refer to Diagnostic Aids for DTC P0300).
The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:
^
DTC P1336 is set.
^
The PCM has been replaced.
^
The PCM has been reprogrammed.
^
The engine has been replaced.
^
The crankshaft has been replaced.
^
The crankshaft harmonic balancer has been replaced.
^
The crankshaft position sensor has been replaced.
IMPORTANT: The scan tool crankshaft position system variation learn function will be inhibited if engine coolant temperature is less than 70°C
(158°F). Allow the engine to warm to at least 70°C (158°F) before attempting the crankshaft position system variation learn procedure.
The scan tool crankshaft position system variation learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or
during the crankshaft position system variation learn procedure. Diagnose and repair any DTCs if set.
The crankshaft position system variation learn tunction will be inhibited if the PCM detects a malfunction involving the camshaft position signal
circuit, the 3X reference circuit, or the 18X reference circuit.
^
If the scan tool indicates a problem with the Cam signal, refer to DTC P0341 CMP Sensor Circuit Performance.
^
If the scan tool indicates a problem with the 3X crank signal, refer to DTC P1374 3X Reference Circuit.
^
If the scan tool indicates a problem with the 18X crank signal, refer to DTC P0336 18X Reference Signal Circuit.
1. Set the parking brake.
2. Start the engine and allow engine coolant temperature to reach at least 70°C (158°F).
3. Turn OFF the ignition switch.
4. Select the crankshaft position variation learn procedure with the scan tool.
5. Proceed as instructed by the scan tool. If the procedure is terminated, refer to Important above for instructions.
6. Observe DTC status for DTC P1336.
7. If the scan tool indicates that DTC P1336 ran and passed, the crankshaft position system variation learn procedure is complete. If the scan tool
indicates DTC P1336 failed or not run, check for other DTCs. If no DTCs other than P1336 are set, repeat the crankshaft position system variation
learn procedure as necessary.
