Diagnostic Procedure
CAUTION:
To prevent damage to scan tool (MB991502), always turn the ignition off before connecting or disconnecting it.
- Connect scan tool (MB991502) to the data link connector. Turn the ignition on. Set the scan tool to data reading mode for item 4A, Fuel Temperature Sensor. Approximately the same as the outside temperature when the engine is cooled. Turn the ignition off. If the sensor is operating properly, it can be assumed that this malfunction is intermittent, refer to INTERMITTENT FAILURES . If the sensor is malfunctioning, go to the next step.
- Check the fuel temperature sensor. Disconnect the fuel temperature sensor connector D-17. Measure the resistance between terminal 1 and 3 of the fuel temperature sensor. Standard value: 0.5-12.0 k/ohms. If the resistance is at the standard value, go to the next step. If the resistance is abnormal, replace the fuel temperature sensor and proceed to step 5 .
- Check connector D-17 at the fuel temperature sensor and connector C-62 at ECM (M/T) or connector C-55 at PCM (A/T) for damage. If the connector is in good condition, go to the next step. If the connector is damaged, repair or replace it and proceed to step 5 .
- Check for short circuit to ground between fuel temperature sensor connector D-17 and ECM connector C-62 (M/T) or PCM connector C-55 (A/T). If the harness wire is in good condition, replace the ECM or PCM, otherwise, repair the damaged harness wire. Go to the next step.
- Carry out a test drive with the drive cycle pattern (Other Monitor), refer to Figure . Check the diagnostic trouble codes. If DTC P0182 is output, retry the troubleshooting. If the DTC is absent, the inspection is complete.
NOTE:
Check harness after checking intermediate connector C-28 and C-90. If intermediate connector is damaged, repair or replace it.