Inspection Procedure 2

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

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 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.

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.

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: 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.