STEP 1. Using scan tool MB991958, check data list item 6: Engine Coolant Temperature 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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item 6, Engine Coolant Temperature Sensor.- The engine coolant temperature and temperature shown with the scan tool should approximately 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. Check harness connector B-11 at engine coolant temperature sensor for damage.
STEP 3. Check the engine coolant temperature sensor.
STEP 4. Check harness connector B-26 at ECM for damage.
STEP 5. Check for short circuit to ground between engine coolant temperature sensor connector B-11 (terminal No. 1) and ECM connector B-26 (terminal No. 26).
STEP 6. Using scan tool MB991958, check data list item 6: Engine Coolant Temperature Sensor.
STEP 7. 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 P0117 set?
Retry the troubleshooting. The inspection is complete.