Code No. B1034, B1035: Ambient air temperature Sensor System

DIAGNOSIS CODE SET CONDITION

Diagnosis code No. B1034 is stored if there is a short circuit in the ambient air temperature sensor input circuit.
Diagnosis code No. B1035 is stored if there is a defective connector connection, or if there is an open circuit in the harness.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

The ETACS-ECU, the ambient air temperature sensor, or connector(s) or wiring between the two may be defective.

Past trouble

If diagnosis code No. B1034 or B1035 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the ETACS-ECU and the ambient air temperature sensor. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

TROUBLESHOOTING HINT

Malfunction of connector.
Malfunction of the harness.
Malfunction of the ambient air temperature sensor.
Malfunction of the ETACS-ECU.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Check that the following service data display contents are normal. (Refer to

).

Item No.252: Ambient air temperature Sensor

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 2.

STEP 2. Check of open circuit in AMB+ and AMB- line (ETACS-ECU) between ambient temperature sensor connector and ETACS-ECU connector.

Q. Is the check result normal?

	Go to Step 3.

	Repair the connector(s) or wiring harness.

STEP 3. Inspection of the ambient temperature sensor

Refer to

.

Q. Is the check result normal?

	Go to Step 4.

	Replace the ambient temperature sensor.

STEP 4. Retest the system.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

	Replace the ETACS-ECU.