Circuit Description
The ignition control module (ICM) sends a reference signal to the PCM to indicate crankshaft position and engine RPM. With this information the PCM can determine when to pulse the ignition coils and to control ignition timing. This signal is referred to as a medium resolution signal. The ICM supplies 5 volts from terminal G through CKT 430 to PCM terminal J2-32. This grounds the circuit for a very short period of time. The seventh pulse is the sync pulse and is used for crankshaft position reference.
Conditions for Setting the DTC
The PCM misses 15 resync pulses within 4 minutes and 15 seconds.
Action Taken when the DTC Sets
The malfunction indicator lamp (MIL) will illuminate.
Conditions for Clearing the DTC
| • | A history DTC P0335 will clear after 40 consecutive ignition cycles have occurred without a fault. |
| • | The MIL will turn OFF after passing three consecutive diagnostic test. |
| • | History and current DTC P0335 can be cleared by using a scan tool. |
Diagnostic Aids
| • | If the complaint was Crank But Will Not Run, DTC P0335 may be set when attempting to start the engine more than 15 times and the ignition is not turned OFF between attempts. |
| • | An intermittent problem may be caused by a rubbed through wire insulation or a poor connection. |
| • | An intermittent can also be the result of a defective reluctor wheel. Remove the crankshaft sensor and inspect the reluctor wheel through hole. Check for porosity and condition of wheel. |
Test Description
The numbers below refer to the step numbers on the diagnostic chart.
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When a med. resync occurs, engine stumble also occurs. If a component connection or wire is at fault, engine stumble may be induced by wiggling the circuit or connector.
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Operating a faulty non-engine related electronic components may emit electromagnetic interference's which may cause a med. resync.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics | |||
1 | Was the On-Board Diagnostic (OBD) System Check performed? | Go to Step 2 | |
With the engine running, wiggle the connectors of the PCM, ICM, and CKP sensor and related circuits, while listening for engine stumble. Does the engine stumble? | Go to Step 5 | Go to Step 3 | |
Does the Med. Resolution Resync Cntr on the scan tool resync? | Go to Step 5 | Go to Step 4 | |
4 | Replace the crankshaft position sensor. Is the condition fixed? | Go to Step 6 | |
5 | Repair the faulty circuit that created the problem. Is action complete? | -- | |
6 | Replace PCM. Is action complete? | -- | |
