P0336

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The electronic Ignition Control Module (ICM) sends a reference signal to the Powertrain Control Module (PCM) seven times per crankshaft revolution to indicate crankshaft position and RPM so that the PCM can determine when to pulse the ignition coils and control the ignition timing. This signal is called medium resolution 7X reference, because it occurs seven times per crankshaft revolution. The ICM applies 5 volts through the 7X reference circuit and, in effect, switches this circuit to ground for a very short period of time. The seventh pulse is the sync pulse and is used for crankshaft position reference.

CONDITIONS FOR RUNNING THE DTC
^ The engine is running.
^ DTC P0341 is not set.

CONDITIONS FOR SETTING THE DTC
The CKP resync counter reaches a count of more than 15 within 4 minutes and 15 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The Malfunction Indicator Lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.
^ The PCM records the operating conditions at the time when the diagnostic fails. This information stores in the Freeze Frame and Failure Records buffers.
^ A history DTC stores.
^ The 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.
^ Use a scan tool to clear the DTCs.

DIAGNOSTIC AIDS
^ If the complaint was Engine Cranks But Will Not Run, DTC P0335 may be set by attempting to start the engine more than 15 times without turning the ignition OFF between attempts.
^ An intermittent problem may be caused by the following conditions:
- Rubbed-through wire insulation
- A faulty electrical connection
- A broken wire inside the insulation
^ Thoroughly inspect any suspected circuitry for the following conditions:
- Backed-out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Damaged terminals
- Faulty terminal-to-wire 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 the hole. Check for the porosity and the condition of the wheel.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
4. When a medium resolution resync occurs, engine stumble should also occur. If a component's connection or wire is malfunctioning, an engine stumble or a medium resolution resync may be induced by wiggling the circuit and/or connector.