Inspection Procedure 2

INSPECTION PROCEDURE 2: "-" (Ambient air temperature sensor error) is displayed on the ambient air temperature display. [Vehicles with TYPE 1]













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 and multi-center display unit connector C-06 for damage.





Q. Are the ambient air temperature sensor connector A-27 and multi-center display unit connector C-06 in good condition?

YES Go to Step 2.

NO Repair or replace the connector. 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. 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 (Refer to Removal and Replacement).





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

Q. Is the resistance value close to the value on the graph?

YES There is no action to be taken.

NO Replace the ambient air temperature sensor.