P0336

Schematic:

The crankshaft position (CKP) sensor produces an AC voltage of different amplitude and frequency depending on the velocity of the crankshaft. The CKP sensor works in conjunction with a 58 tooth reluctor wheel on the crankshaft. Each tooth is spaced six degrees apart with one span having a 12 degree space that is uncut. This uncut portion creates a pattern that enables the ECM to determine top dead center for cylinder # 1 and its mating cylinder, cylinder # 4. The camshaft position (CMP) sensor is then used to determine when cylinder # 1 is on its compression stroke. With both CKP sensor and CMP sensor inputs, the ECM can properly synchronize ignition timing, fuel delivery and spark knock control. The ECM uses a pull-up voltage of 2.5 volts on each CKP sensor wire used for the reduction of noise interference from electromagnetic generating devices. DTC P0336 will set if the ECM loses the TDC cylinder # 1 reference position after it has already synchronized engine position when the engine has been running or cranking. During this time the ECM is receiving a valid CMP sensor signal. This indicates that an erratic or intermittent A/C voltage from the CKP sensor is occurring.

DTC PARAMETERS
DTC P0336 will set if the ECM loses the cylinder # 1 crankshaft reference position and has to resync engine position when:
^ ECM has to resync the engine position 1 or more times
^ A valid CMP sensor signal is being received
^ Engine is cranking or running

DTC P0336 diagnostic runs continuously with engine running or cranking.

P0336 is a type B DTC.

DIAGNOSTIC AIDS


IMPORTANT:
^ If DTC P0336 is also set, diagnose that DTC first
^ The engine will still run if circuit 5039 is open with engine speed above 2500 rpm. Below 2500 rpm, the engine will stall. The engine will NOT run if circuit 5024 is open.

If an erratic or intermittent circuit fault is occurring under 2500 mm the engine will cut out. Use Scan tool to monitor ENGINE SPEED while running engine. Wiggling wires while watching for ENGINE SPEED to drop out may locate the area where an open anywhere in the circuit or short to voltage on circuit 5024 may exist.

NOTE:
^ A short to ground on either circuit 5024 or 5039 will not affect the CKP sensor signal to the ECM and will NOT set any CKP sensor circuit DTCs.
^ If this DTC is intermittent, allow engine to reach normal operating temperature while checking for an engine stall condition. The CKP sensor may have an intermittent open or high resistance at higher temperatures.

CKP sensor resistance: 800-1200 ohms