P0340
Connectors:
CIRCUIT OPERATION
- The camshaft position sensor power is supplied from the MFI relay (terminal 1). Ground is provided through terminal 7 to chassis ground.
- A 5-volt voltage is applied on the camshaft position sensor output terminal (terminal 5) from the ECM (terminal 50)
TECHNICAL DESCRIPTION
- The camshaft position sensor functions to detect the top dead center position of the number 1 cylinder and to convert that data to pulse signals that are input to the ECM
- When the engine is running, the camshaft position sensor outputs a pulse signal.
- The ECM
DTC SET CONDITIONS
Check Conditions
- Engine speed is higher than 50 r/min.
Judgment Criteria
- Camshaft position sensor output voltage has not changed (no pulse signal is input) for 2 seconds.
Check Conditions
- Engine speed is higher than 50 r/min.
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:)
- Camshaft position sensor failed.
- Open or shorted camshaft position sensor circuit, or loose connector.
- ECM failed.
- PCM failed.
DIAGNOSIS
STEP 1. Using the oscilloscope, check the camshaft position sensor.
1. Disconnect the camshaft position sensor connector B-22, and connect test harness special tool (MB991348) in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to the camshaft position sensor side connector terminal 5.
NOTE: When measuring with the ECM or PCM side connector, connect an oscilloscope probe to terminal 50
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 2.
NO: Go to Step 4.
STEP 2. Check connector B-22 at camshaft position sensor for damage.
Q: Is the connector in good condition?
YES: Go to Step 3.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 3. Check the trouble symptoms.
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.
2. Check the diagnostic trouble code (DTC).
Q: Is the DTC P0340 is output?
YES: Replace the ECM or PCM. Then go to Step 18.
NO: It can be assumed that this malfunction is intermittent.
Refer to How to Use Troubleshooting/Inspection Service Points.
STEP 4. Check connector B-22 at camshaft position sensor for damage.
Q: Is the connector in good condition?
YES: Go to Step 5.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 5. Check the sensor supply voltage at camshaft position sensor connector B-22.
1. Disconnect the connector B-22 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 5 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 voltage normal?
YES: Go to Step 10.
NO: Go to Step 6.
STEP 6. Check the sensor supply voltage at ECM connector C-118
1. Do not disconnect the ECM connector C-118
2. Disconnect the camshaft position sensor connector B-22.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between terminal 50
- Voltage should be between 4.8 and 5.2 volts.
5. Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the voltage normal?
YES: Go to Step 7.
NO: Go to Step 8.
STEP 7. Check connector C-118 at ECM
Q: Is the connector in good condition?
YES: Repair harness wire between camshaft position sensor connector B-22 terminal 5 and ECM connector C-118 terminal 50
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 8. Check connector C-118 at ECM
Q: Is the connector in good condition?
YES: Go to Step 9.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 9. Check for short circuit to ground between camshaft position sensor connector B-22 terminal 5 and ECM connector C-118 terminal 50
Q: Is the harness wire in good condition?
YES: Replace the ECM or PCM. Then go to Step 18.
NO: Repair it. Then go to Step 18.
STEP 10. Check the power supply voltage at camshaft position sensor connector B-22.
1. Disconnect the connector B-22 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 6 and ground.
- Voltage should be battery positive voltage.
4. Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the voltage normal?
YES: Go to Step 12.
NO: Go to Step 11.
STEP 11. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?
YES: Repair harness wire between MFI relay connector A-21X terminal 1 and camshaft position sensor connector B-22 terminal 6 because of open circuit or short circuit to ground. Then go to Step 18.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 12. Check the continuity at camshaft position sensor connector B-22.
1. Disconnect the connector B-22 and measure at the harness side.
2. Check for the continuity between terminal 7 and ground. Should be less than 2 Ohms.
Q: Is the continuity normal?
YES: Go to Step 13.
NO: Repair harness wire between camshaft position sensor connector B-22 terminal 7 and ground because of open circuit or harness damage. Then go to Step 18.
STEP 13. Check connector A-21X at the MFI relay for damage.
Q: Is the connector in good condition?
YES: Go to Step 14.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 18.
STEP 14. Check connector C-118 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 18.
STEP 15. Check for harness damage between MFI relay connector A-21X terminal 1 and camshaft position sensor connector B-22 terminal 6.
Q: Is the harness wire in good condition?
YES: Go to Step 16.
NO: Repair it. Then go to Step 18.
STEP 16. Check for harness damage between camshaft position sensor connector B-22 terminal 5 and ECM connector C-118 terminal 50
Q: Is the harness wire in good condition?
YES: Go to Step 17.
NO: Repair it. Then go to Step 18.
STEP 17. Check the camshaft position sensor vane.
Q: Is the vane in a good condition?
YES: Replace the camshaft position sensor. Then go to Step 18.
NO: Repair it. Then go to Step 18.
STEP 18. Test the OBD-II drive cycle.
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.
2. Check the diagnostic trouble code(DTC).
Q: Is the DTC P0340 is output?
YES: Retry the troubleshooting.
NO: The inspection is complete.