P0335

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The PCM supplies B+ and a ground to the crankshaft position (CKP) sensor. The CKP sensor sends a reference signal to the PCM seven times per crankshaft revolution to indicate crankshaft position and RPM. This signal is called the 7X reference signal because the signal occurs seven times per crankshaft revolution. The seventh pulse is the sync pulse and is used for crankshaft position reference. The PCM can calculate when to pulse the ignition coils based on this information.

CONDITIONS FOR SETTING THE DTC

PCM sees more than 15 CKP sensor resync's in 255 seconds (4 minutes and 15 seconds).

ACTION TAKEN WHEN THE DTC SETS

^ The Malfunction Indicator Lamp (MIL) will illuminate.

^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.

^ A history DTC is stored.

^ Coolant fan turns ON.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.

^ A history DTC will clear after 40 consecutive warm up cycles without a fault.

^ DTC(s) can be cleared by using the scan tool.

DIAGNOSTIC AIDS

^ If the complaint was Cranks 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.

^ Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions:

- Backed out terminals

- Improper mating

- Broken locks

- Improperly formed

- Damaged terminals

- Poor terminal to wiring connections

- Physical damage to the wiring harness

^ 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

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

3. When a med. resync occurs, engine stumble also occurs. Whenever a component connection or wire is at fault engine stumble may be induced by wiggling the circuit or connector.

4. Operating a faulty non-engine related electronic components may emit electromagnetic interference's which may cause a med. resync.

10. Before replacing the PCM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. Replacement PCM's must be reprogrammed. Refer to the latest Techline information for programming procedures.