Malibu V6-191 3.1L VIN M SFI (1997)
Crankshaft Position Sensor: Testing and Inspection
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 DTC P0300 Engine Misfire Detected. See: Powertrain Management/Computers and Control Systems/Testing and Inspection
The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:
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DTC P1336 is set.
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The PCM has been replaced.
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The PCM has been reprogrammed.
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The engine has been replaced.
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The crankshaft has been replaced.
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The crankshaft harmonic balancer has been replaced.
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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 (156°F).
Allow the engine to warm to at least 70°C (156°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
function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 24X reference
circuit.
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If the scan tool indicates a problem with the Cam signal, refer to DTC P0341 CMP Sensor Circuit Performance. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
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If the scan tool indicates a problem with the 3X crank signal, refer to DTC P1374 3X Reference Circuit. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
^
If the scan tool indicates a problem with the 24X crank signal, refer to DTC P0336 24X Reference Signal Circuit. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
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 from the scan tool special functions list.
5. Follow the instructions displayed on 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.
