P0335

Diagnostic Chart:

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 P0335 will set if the ECM does not detect a CKP sensor A/C voltage signal, after it has received a certain number of valid camshaft position sensor pulses. This indicates that an open or short to voltage in the CKP sensor circuit is occurring.

DTC PARAMETERS
DTC P0335 will set if the ECM does NOT receive a CKP sensor A/C voltage signal when 8 valid CMP sensor signal pulses have been received.

DTC P0335 diagnostic runs continuously with engine running or cranking.

P0335 is a type B DTC.

DIAGNOSTIC AIDS

IMPORTANT: 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 the engine is running at idle, this DTC is NOT active.

If the engine does not start, use Scan tool to monitor ENGINE SPEED while cranking over engine. Wiggling wires while checking for ENGINE SPEED may locate the area where an open anywhere in the wiring 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.

Circuit 5039 and 5024 should each have 2.5 volts from the ECM.

CKP sensor resistance: 800-1200 ohms