Inspection Procedure 2

INSPECTION PROCEDURE 2: "-" (Ambient air temperature sensor error) is displayed on the ambient air temperature display.

Ambient Air Temperature Sensor Circuit:

CIRCUIT OPERATION
The ambient air temperature sensor signal sent to multi-center display unit.

TECHNICAL DESCRIPTION (COMMENT)
The ambient air temperature sensor circuit is suspected to be open or short.

TROUBLESHOOTING HINTS
- Malfunction of the ambient air temperature sensor.
- Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe




STEP 1. Check the ambient air temperature sensor connector A-27 for damage.

Q: Is the ambient air temperature sensor connector A-27 in good condition?

YES: Go to Step 2.

NO: Repair or replace the connector. Refer to Harness Connector Inspection.







STEP 2. Check the wiring harness between ambient air temperature sensor connector A-27 (terminals 1 and 2) and multi-center display unit connector C-06 (terminals 14 and 15).

NOTE: After checking intermediate connector C-21, check the wires. If intermediate connector C-21 is damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Is the wiring harness between ambient air temperature sensor connector A-27 (terminals 1 and 2) and multi-center display unit connector C-06 (terminals 14 and 15) in good condition?

YES: Go to Step 3.

NO: Repair the wiring harness. The multi-center display unit should work normally.

STEP 3. Check the ambient air temperature sensor

1. Remove the front bumper.




2. Remove the ambient air temperature sensor connector A-27.




3. Measure the resistance between the ambient air temperature sensor connector terminals at two or more temperature condition.

Q: Does the resistance value exist within the characteristic graph?

YES: There is no action to be taken.

NO: Replace the ambient air temperature sensor.