DTC 1-2-2

DTC 1-2-2. OUTSIDE TEMPERATURE SENSOR OPEN CIRCUIT OR SHORTED TO 12 V:





- Condition for DTC:
If signal from outside temperature sensor is missing or is shorted to 12 V, the control module will record the fault and store the DTC.

- Cause of fault:
Break in outside temperature sensor or wire, or wire shorted to 12V.

- Symptoms:
Fault warning to driver. LEDs by A/C and REC buttons flash for 20 sec. Control module cuts out the faulty signal and substitutes a preset replacement value equivalent to 0°C.

Check Other DTCs:





1-2-2, 1-2-4, 1-2-6, 2-1-1, 2-2-1, 2-3-1, 2-3-3 and 2-3-5. Are these DTCs stored at the same time?
If YES, there is a break in a common ground (GND) wire.
- Ignition off.
- Check wire between branching point 23/306 and connector A pins A:9 and A:10 to control module for open circuits. Checking Wires
Deal with open circuits.
Check DTC. Test Procedures

If NO, there is an open circuit or GND short in a wire which only goes between the control module and the outside temperature sensor. Go to the next step "Connecting Test Unit To Control Module".

Connecting Test Unit To Control Module:





- Ignition off.
- Connect test unit between control module and A/C system connector and check GND points. Connecting and Disconnecting Test Unit
- Go to the next step "Check Voltage To Outside Temperature Sensor".

Check Voltage To Outside Temperature Sensor:











- Ignition on.
- Connect a voltmeter between # 10 (0 V) and # 14. At 20°C, voltmeter should read approx. 2.6 V. (voltage varies with outside air temperature.)
If voltmeter reads 5 V, open circuit in wire or outside temperature sensor. Go to the next step "Check Wire Resistance".

If voltmeter reads 12 V, open circuit in wire.
- Check wire between connector pin 1 and connector A pin A:14 to control module for short to 12 V. Checking Wires
- Rectify short.
- Check DTC. Test Procedures

Check Wire Resistance:








- Ignition off.
- Disconnect adapter from control module.
- Disconnect connector from outside temperature sensor.
- Bridge over connecting pins 1 and 2 on wire connector.
- Connect an ohmmeter across # 10 and # 14.
If ohmmeter reading is 0 ohm, wire is OK. Break in outside temperature sensor. Go to the next step "Check Outside Temperature Sensor".
If ohmmeter reading is infinite, outside temperature sensor is OK. Check wire for open circuit. Checking Wires
- Check live wire between connector pin 1 and connector A pin A:14.
- Check GND wire between connector pin 2 and connector A pin A:10.
- Rectify open circuit.
- Check DTC. Test Procedures

Check Outside Temperature Sensor:








- Ignition off.
- Disconnect connector from outside temperature sensor.
- Connect an ohmmeter across outside temperature sensor pins 1 and 2.
If value is OK, ohmmeter should read approx. 8-12 K ohms.
If not, ohmmeter reading is infinite, there is an open circuit in the outside temperature sensor. Replace outside temperature sensor and refit in reverse order.
Check DTC. Test Procedures