[Previous][Next]
Inspection Procedure 13: Ambient temperature sensor does not work.
 
 
cautionBefore replacing the combination meter, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.
 
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
When the ambient temperature sensor does not work, the ambient temperature sensor circuit, the ambient temperature sensor may be defective.
 
 
 
TROUBLESHOOTING HINTS
  • The ambient temperature sensor circuit may be defective.
  • The combination meter may be defective.
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
 
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the ambient temperature sensor.
Refer to GROUP 55B - Inspection, Ambient Temperature Sensor Check .
Is the check result normal?
Go to Step 2.
Replace the ambient temperature sensor.
 
STEP 2. Resistance measurement at the ambient temperature sensor connector.
(1) Disconnect the ambient temperature sensor connector, the measure at the harness side.
(2) Measure the resistance between the ambient temperature sensor connector (ground terminal) and ground.
OK: The resistance should be 2 ohm or less.
Is the check result normal?
Go to Step 4.
Go to Step 3.
 
STEP 3. Check of open circuit in SENG line between the combination meter connector and the ambient temperature sensor connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check of open circuit in AMB line between the combination meter connector and the ambient temperature sensor connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Retest the system.
Check that the ambient temperature sensor circuit works normally.
Is the check result normal?
The procedure is complete.
Replace the combination meter.