P0335

DTC P0335 Crankshaft Position Sensor "A" Circuit

DESCRIPTION

DTC Detection Condition:

The crankshaft position sensor (CKP) system consists of a crankshaft position 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 per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

Reference: Inspection using an oscilloscope.

HINT: The correct waveform is as shown.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

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

Wiring Diagram:

INSPECTION PROCEDURE

HINT:
- Perform troubleshooting for DTC P0335 first. If no trouble is found, troubleshoot the engine mechanical systems.
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
- Read the values using the intelligent tester.

a. Connect the intelligent tester to the DLC3.
b. Turn the power switch ON (IG).
c. Turn the intelligent tester ON.
d. Put the engine in inspection mode.
e. Start the engine.
f. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / ENGINE SPD.
g. Read the value.

- The engine speed can be observed in DATA LIST using the intelligent tester. If there is no NE signal from the crankshaft position sensor even though the engine is running, the engine speed will be indicated as zero. If voltage output from the crankshaft position sensor is insufficient, the engine speed will be indicated as lower RPM (than the actual RPM).