P0335
DTC P0335 Crankshaft Position Sensor "A" CircuitDTC P0339 Crankshaft Position Sensor "A" Circuit Intermittent
DESCRIPTION
DTC Detection Conditions:
The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate has 34 teeth and it is installed on the crankshaft. The pickup coil is made of an iron core and a magnet.
The sensor plate rotates and, as each tooth passes through the pickup coil, a pulse signal is created. The pickup 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 shown on the left.
- G2+ stands for the Camshaft Position (CMP) sensor signal, and NE+ stands for the CKP sensor signal.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
Component Operating Range:
If there is no signal from the CKP sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, a DTC is set 10 seconds after the engine is next started.
Wiring Diagram:
Step 1-2:
Step 2(continued)-4:
INSPECTION PROCEDURE
HINT:
- If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
- Check the engine speed. The engine speed can be checked by using an intelligent tester or OBD II scan tool. To check, follow operation:
a. Connect an intelligent tester or OBD II scan tool to the DLC3.
b. Start the engine.
c. Turn the tester or scan tool ON.
d. If using an intelligent tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD.
e. If using an OBD II scan tool, refer to the instruction manual.
The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the Crankshaft Position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor voltage output is insufficient.
- Read freeze frame data using an intelligent tester or OBD II scan tool. 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.