Troubleshooting

DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT

CIRCUIT DESCRIPTION

DTC Detection Condition:

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pick-up coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pick-up coil is made of an iron core and magnet. The sensor plate rotates and as each tooth passes through the pick-up coil, a pulse signal is created. The pick-up coil generates 34 signals for each engine revolution. Based on these signals, the ECM calculates the CKP and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

Reference: CKP and CMP sensor waveforms







Using an oscilloscope, confirm the CKP sensor condition at the engine idling.

The correct waveform is as shown.
a. CMP sensor
b. CKP sensor

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

If there is no signal from the CKP sensor even though the engine is revolving, the ECM interprets this as a malfunction of the sensor.

Wiring Diagram:

Step 1:

Step 2 - 4:

INSPECTION PROCEDURE

HINT:
- Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- The engine RPM can be confirmed in Data List using the hand-held tester. If there are no NE signals from the CKP sensor despite the engine revolving, the engine speed will be indicated as zero. If voltage output of the CKP sensor is insufficient, the engine RPM will be indicated as than it actually is.