P0335
Crankshaft Position Sensor Circuit:
Connectors:
CIRCUIT OPERATION
- The crankshaft position sensor power is supplied from the MFI relay (terminal No.4). Terminal No.1 of the crankshaft position sensor is grounded with ECM (terminal No.34)
- A 5-volt voltage is applied on the crankshaft position sensor output terminal (terminal No.2) from the ECM (terminal No.43)
TECHNICAL DESCRIPTION
- The crankshaft position sensor detects the crank angle (position) of each cylinder, and converts that data to pulse signals, which are then input to the ECM
- When the engine is running, the crankshaft position sensor outputs a pulse signal.
- The ECM
DTC SET CONDITIONS
Check Conditions
- Engine is being cranked.
Judgment Criteria
- Crankshaft position sensor output voltage has not changed (no pulse signal is input) for 2 seconds.
Check Conditions, Judgment Criteria
- Normal signal pattern has not been input for cylinder identification from the crankshaft position sensor signal and camshaft position sensor signal for 2 seconds.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Crankshaft position sensor failed.
- Open or shorted crankshaft position sensor circuit, or loose connector.
- ECM failed.
- PCM failed.
DIAGNOSIS
Required Special Tools:
- MB991502: Scan Tool (MUT-II)
- MB998478: Test Harness (3pin, triangle)
STEP 1. Using scan tool MB991502, check data list item 22: Crankshaft Position Sensor.
CAUTION
To prevent damage to scan fool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for item 22, Crankshaft Position Sensor.
- The tachometer and engine speed indicated on the scan tool should much.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES: It can be assumed that this malfunction is intermittent. Refer to INTRODUCTION, How to Use Troubleshooting/Inspection Service Points.
NO: Go to Step 2.
STEP 2. Using the oscilloscope, check the crankshaft position sensor
1. Disconnect the crankshaft position sensor connector, and connect the test harness special tool (MD998478) in between.
2. Connect the oscilloscope probe to crankshaft position sensor connector terminal No.2 (bank clip of special tool).
NOTE: Connect the oscilloscope probe to terminal No.43
3. Start the engine and run at idle.
4. Check the waveform.
- The waveform should show a pattern similar to the illustration.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES: Go to Step 3.
NO: Go to Step 5.
STEP 3. Check connector B-20 at the crankshaft position sensor for damage.
Q: Is the connector in good condition?
YES: Go to Step 4.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
STEP 4. Using scan tool MB991502, check data list item 22: Crankshaft Position Sensor.
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991502 to the data reading mode for item 22, Crankshaft Position Sensor.
- The tachometer and engine speed indicated on the scan tool should much.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES: It can be assumed that this malfunction is intermittent. Refer to INTRODUCTION, How to Use Troubleshooting/Inspection Service Points.
NO: Replace the ECM or PCM. Then go to Step 21.
STEP 5. Check connector B-20 at the crankshaft position sensor for damage.
Q: Is the connector in good condition?
YES: Go to Step 6.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
STEP 6. Measure the sensor supply voltage at crankshaft position sensor harness side connector B-20.
1. Disconnect~the connector B-20 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal No.2 and ground.
- Voltage should be between 4.8 and 5.2 volts.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES: Go to Step 11.
NO: Go to Step 7.
Connectors:
STEP 7. Measure the sensor supply voltage at ECM connector C-118
1. Do not disconnect the ECM connector C-118
2. Disconnect the crankshaft position sensor connector B-20.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between terminal No.43
- Voltage should be between 4.8 and 5.2 volts.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES: Go to Step 8.
NO: Go to Step 9.
Connectors:
STEP 8. Check connector C-118 at ECM
Q: Is the connector in good condition?
YES: Repair it because of open circuit between crankshaft position sensor connector B-20 (terminal No.2) and ECM connector C-118 (terminal No.43)
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
Connectors:
STEP 9. Check connector C-118 at ECM
Q: Is the connector in good condition?
YES: Go to Step 10.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
Connectors:
STEP 10. Check for short circuit to ground between crankshaft position sensor connector B-20 (terminal No.2) and ECM connector C-118 (terminal No.43)
Q: Is the harness wire in good condition?
YES: Replace the ECM or PCM. Then go to Step 21.
NO: Repair it. Then go to Step 21.
STEP 11. Measure the power supply voltage at crankshaft position sensor harness side connector B-20.
1. Disconnect the connector B-20 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal No.3 and ground.
- Voltage should be battery positive voltage.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) present?
YES: Go to Step 13.
NO: Go to Step l2.
STEP 12. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?
YES: Repair harness wire between MFI relay connector A18X (terminal No.4) and crankshaft position sensor connector B-20 (terminal No.3) because of open circuit or short circuit to ground. Then go to Step 21.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
STEP 13. Check the continuity at crankshaft position sensor harness side connector B-20.
1. Disconnect the connector B-20 and measure at the harness side.
2. Check for the continuity between terminal No.1 and ground.
- Should be less than 2 ohms.
Q: Is the continuity normal?
YES: Go to Step 16.
NO: Go to Step l4.
Connectors:
STEP 14. Check connector C-111 at ECM
Q: Is the connector in good condition?
YES: Go to Step 15.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
Connectors:
STEP 15. Check for open circuit and harness damage between crankshaft position sensor connector B-20 (terminal No.1) and ECM connector C-111 (terminal No.34)
Q: Is the harness wire in good condition?
YES: Replace the ECM or PCM. Then go to Step 21.
NO: Repair it. Then go to Step 21.
STEP 16. Check connector A-18X at the MFI relay for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 17.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 21.
STEP 17. Check connector C-118 at ECM
Q: Is the connector in good condition?
YES: Go to Step 18.
NO: Repair or replace it; Refer to Harness Connector Inspection. Then go to Step 21.
Connectors:
STEP 18 Check for harness damage between MFI relay connector A-18X (terminal No.4) and crankshaft position sensor connector B-20 (terminal No.3).
Q: Is the harness wire in good condition?
YES: Go to Step 19.
NO: Repair it. Then go to Step 21
Connectors:
STEP 19. Check for harness damage between crankshaft position sensor connector B-20 (terminal No.2) and ECM connector C-118 (terminal No.43)
Q: Is the harness wire in good condition?
YES: Go to Step 20.
NO: Repair it Then go to Step 21.
STEP 20. Check the crankshaft sensing blade.
Q: Is the crankshaft sensing blade in a good condition?
YES: Replace the crankshaft position sensor. Then go to Step 21.
NO: Repair it. Then go to Step 21.
STEP 21. Test the OBD-II drive cycle.
1. Carry out a test drive with the drive cycle pattern. Refer to Trouble Code Diagnosis - OBD-III Drive Cycle - Procedure 6 - Other Monitor.
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0335 set?
YES: Retry the troubleshooting.
NO: The inspection is complete