DTC B1106[16] Evaporator Temperature Sensor: Short to Ground (Auto A/C)

1. Auto A/C control system check

Refer to "57.HVAC Control 7A.Troubleshooting(Auto A/C) diagnostic system check-auto A/C controls".

2. Evaporator temperature sensor signal voltage check

1) Observe the Evaporator Temperature Sensor A/D Input Raw Voltage parameter on the scan tool. Is the Evaporator Temperature Sensor A/D Input Raw Voltage parameter equal to the specified value?

Value: 0 V

Yes

=>Go to Evaporator temperature sensor signal output voltage check.

Go to Intermittent conditions of auto A/C control system.

Refer to "208.HVAC 21D.Symptom intermittent conditions of auto A/C control system".

3. Evaporator temperature sensor signal output voltage check

1) Turn OFF the ignition switch.

2) Disconnect the evaporator temperature sensor harness connector (B53).

Refer to "LHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the Evaporator Temperature Sensor A/D Input Raw Voltage parameter on the scan tool. Is the Evaporator Temperature Sensor A/D Input Raw Voltage parameter more than or equal to the specified value?

Value: 4.5 V

Yes

Replace the evaporator temperature sensor.

Refer to "7.HVAC 7B.Heater Ventilator Airconditioner evaporator core removal".

Refer to "7.HVAC 7B.Heater Ventilator Airconditioner evaporator core installation".

=>Go to Repair verification.

=>Go to Inspection for short to ground in evaporator temperature sensor signal circuit.

4. Inspection for short to ground in evaporator temperature sensor signal circuit

1) Inspect the evaporator temperature sensor signal circuit between the auto A/C control unit harness connector (pin 7 of B10) and the evaporator temperature sensor (pin 2 of B53) for the following. Is the result normal?

Short to ground
Short to the low reference circuit

Refer to "LHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Auto A/C control unit harness connector inspection.

Repair the circuit as necessary.

=>Go to Repair verification.

5. Auto A/C control unit harness connector inspection

1) Inspect for poor connections at the auto A/C control unit harness connector (pins 7 and 40 of B10). Is the connection status normal?

Refer to "LHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD HVAC (Automatic Air Conditioner)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Control panel replacement.

Repair the connections as necessary.

=>Go to Repair verification.

6. Control panel replacement

Note

Perform programming after replacing the control panel.

Refer to "7.HVAC 7B.Heater Ventilator Airconditioner control panel and control lever removal".

Refer to "7.HVAC 7B.Heater Ventilator Airconditioner control panel and control lever installation".

Refer to "7.HVAC 7B.Heater Ventilator Airconditioner control panel and control lever setting".

Procedure completion

=>Go to Repair verification.

7. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch.

3) Start the engine.

4) Observe the DTC information with a scan tool.