STEP 1. Using scan tool MB991958, check data list item 2: Crankshaft Position Sensor.
caution | To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. |
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 2, Crankshaft Position Sensor.- The tachometer and engine speed indicated on the scan tool should match.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions . Go to Step 2.
STEP 2. Using the oscilloscope, check the crankshaft position sensor.
(1) Disconnect the crankshaft position sensor connector B-111 and connect the test harness special tool MB991709 between the separated connectors. (All terminals should be connected.)
(2) Connect the oscilloscope probe to terminal No. 3 of the crankshaft position sensor connector.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. 8. |
(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 3. Go to Step 4.
STEP 3. Check harness connector B-111 at crankshaft position sensor and harness connector B-26 at ECM for damage.
STEP 4. Check harness connector B-111 at crankshaft position sensor for damage.
STEP 5. Measure the sensor supply voltage at crankshaft position sensor harness side connector B-111.
(1) Disconnect the connector B-111 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 9. Go to Step 6.
STEP 6. Check harness connector B-26 at ECM for damage.
STEP 7. 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 crankshaft position sensor connector B-111.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 8 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 crankshaft position sensor connector B-111 (terminal No. 3) and ECM connector B-26 (terminal No. 8) because of open circuit. Then go to Step 20. Go to Step 8.
STEP 8. Check for short circuit to ground between crankshaft position sensor connector B-111 (terminal No. 3) and ECM connector B-26 (terminal No. 8).
STEP 9. Measure the sensor supply voltage at crankshaft position sensor harness side connector B-111.
(1) Disconnect the connector B-111 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 12. Go to Step 10.
STEP 10. Check harness connector B-26 at ECM for damage.
STEP 11. Check for open circuit and short circuit to ground between crankshaft position sensor connector B-111 (terminal No. 1) and ECM connector B-26 (terminal No. 9).
STEP 12. Check the continuity at crankshaft position sensor harness side connector B-111.
STEP 13. Check harness connector B-26 at ECM for damage.
STEP 14. Check for open circuit and harness damage between crankshaft position sensor connector B-111 (terminal No. 2) and ECM connector B-26 (terminal No. 24).
STEP 15. Check harness connector B-26 at ECM for damage.
STEP 16. Check for harness damage between ECM connector B-26 (terminal No. 9) and crankshaft position sensor connector B-111 (terminal No. 1).
STEP 17. Check for harness damage between crankshaft position sensor connector B-111 (terminal No. 3) and ECM connector B-26 (terminal No. 8).
STEP 18. Check the trouble symptoms.
STEP 19. Using scan tool MB991958, check data list item 2: Crankshaft Position Sensor.
STEP 20. 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 P0335 set?
Retry the troubleshooting. The inspection is complete.