[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
55 -HEATER, AIR CONDITIONER AND VENTILATION > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > B1034 Ambient Temperature Sensor System
Code No. B1034: Ambient air temperature sensor system (short circuit)
Code No. B1035: Ambient air temperature sensor system (open circuit)
 
 
caution
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
 
 
DIAGNOSIS CODE SET CONDITION
  • Diagnosis code No. B1034 is set if there is a short circuit in the ambient air temperature sensor input circuit.
  • Diagnosis code No. B1035 is set 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 set 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.-IIISE data list
Check that the following service data display contents are normal (Refer to GROUP 54A - ETACS ).
Item No.6: Ambient temperature sensor
Is the check result normal?
Go to Step 5.
Go to Step 2.
 
STEP 2. M.U.T.-IIISE CAN bus diagnostics
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C, Troubleshooting ).
 
STEP 3. Check of open circuit in AMB+ and AMB- line between ambient temperature sensor connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Inspection of the ambient temperature sensor
Refer to .
Is the check result normal?
Go to Step 5.
Replace the ambient temperature sensor.
 
STEP 5. Retest the system.
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.