STEP 1. Using the oscilloscope, check the intake camshaft position sensor.
(1) Disconnect the intake camshaft position sensor connector B-118, and connect test harness special tool MB991709 between the separated connectors. (All terminals should be connected.)
(2) Connect the oscilloscope probe to the intake camshaft position sensor side connector terminal No. 3.note | When checking with the ECM side connector, disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors. Then connect the oscilloscope probe to the check harness connector terminal No. 14. |
(3) Start the engine and run at idle.
(4) Check the wave pattern.- The wave pattern should show a pattern similar to the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the wave pattern normal?
Go to Step 2. Go to Step 3.
STEP 2. Check harness connector B-118 at intake camshaft position sensor and harness connector B-26 at ECM for damage.
STEP 3. Check harness connector B-118 at intake camshaft position sensor for damage.
STEP 4. Measure the sensor supply voltage at intake camshaft position sensor harness side connector B-118.
(1) Disconnect the connector B-118 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 between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 8. Go to Step 5.
STEP 5. Check harness connector B-26 at ECM for damage.
STEP 6. Measure the sensor supply voltage at ECM connector B-26 by using power plant ECU check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2) Disconnect the intake camshaft position sensor connector B-118.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 14 and ground.- Voltage should be between 4.9 and 5.1 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Repair harness wire between intake camshaft position sensor connector B-118 (terminal No. 3) and ECM connector B-26 (terminal No. 14) because of open circuit. Then go to Step 19. Go to Step 7.
STEP 7. Check for short circuit to ground between intake camshaft position sensor connector B-118 (terminal No. 3) and ECM connector B-26 (terminal No. 14).
STEP 8. Measure the sensor supply voltage at intake camshaft position sensor harness side connector B-118.
(1) Disconnect the connector B-118 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 11. Go to Step 9.
STEP 9. Check harness connector B-26 at ECM for damage.
STEP 10. Check for open circuit and short circuit to ground between intake camshaft position sensor connector B-118 (terminal No. 1) and ECM connector B-26 (terminal No. 9).
STEP 11. Check the continuity at intake camshaft position sensor harness side connector B-118.
STEP 12. Check harness connector B-26 at ECM for damage.
STEP 13. Check for open circuit and harness damage between intake camshaft position sensor connector B-118 (terminal No. 2) and ECM connector B-26 (terminal No. 30).
STEP 14. Check harness connector B-26 at ECM for damage.
STEP 15. Check for harness damage between ECM connector B-26 (terminal No. 9) and intake camshaft position sensor connector B-118 (terminal No. 1).
STEP 16. Check for harness damage between intake camshaft position sensor connector B-118 (terminal No. 3) and ECM connector B-26 (terminal No. 14).
STEP 17. Check the intake camshaft position sensing portion.
STEP 18. Check the trouble symptoms.
STEP 19. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 . (2) Check the diagnostic trouble code (DTC).
Is DTC P0340 set?
Retry the troubleshooting. The inspection is complete.