P0339
DTC P0339 Crankshaft Position Sensor "A" Circuit IntermittentCIRCUIT DESCRIPTION
DTC Detection Condition:
The Crankshaft Position (CKP) sensor system consists of a crankshaft position signal plate and a pickup coil. The signal plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and magnet. The signal 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 the 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 (CKP) sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor. If the malfunction has not been repaired successfully, a DTC is set 10 seconds after the engine is started.
Wiring Diagram:
INSPECTION PROCEDURE
Step 1 - 2:
Step 3:
HINT:
- If no problem is found in the diagnostic troubleshooting procedure of DTC P0335, troubleshoot the engine mechanical systems.
- Check the engine speed using the hand-held tester or the OBD II scan tool.
a. Connect the hand-held tester or the OBD II scan tool to the DLC3.
b. Start the engine and turn the hand-held tester or the OBD II scan tool ON.
c. On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ENGINE SPD. For the OBD II scan tool, refer to the instruction manual.
The engine speed can be confirmed in DATA LIST using the hand-held tester or the OBD II scan tool. If there are no NE signals from the CKP sensor despite the engine revolving, the engine speed will be indicated as zero. If the voltage output of the CKP sensor is insufficient, the engine speed will be indicated as lower than the actual engine rpm.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.