Diagnostic Trouble Code Chart
HINT:
- If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below.
- *: The air conditioning amplifier stores the DTC of the respective malfunction that has been detected for the period of time indicated in parentheses.
DTC Code | Detection Item | Trouble Area | Memory* | Diagnostic Note | See page |
|---|---|---|---|---|---|
B1412 |
Ambient Temperature Sensor Circuit |
- Cooler thermistor (ambient temperature sensor) - Harness or connector - Air conditioning amplifier assembly |
Stored (4 seconds or more) |
If the ambient temperature is approx. -52.9 °C or less, DTC B1412 may be stored even though the system is normal. |
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B1413 |
Evaporator Temperature Sensor Circuit |
- No. 1 cooler thermistor - Air conditioning harness assembly - Air conditioning amplifier assembly |
Stored (4 seconds or more) |
- |
|
B1422 |
Compressor Lock Sensor Circuit |
- Cooler compressor assembly (A/C lock sensor) - Compressor drive belt - Harness or connector - Air conditioning amplifier assembly - CAN communication system |
- |
- |
|
B1441 |
Air Mix Damper Control Servo Motor Circuit (Passenger Side) |
- Damper servo sub-assembly (air mix damper servo) - Air conditioning harness assembly - Air conditioning amplifier assembly |
Stored (30 seconds or more) |
- |
|
B1442 |
Air Inlet Damper Control Servo Motor Circuit |
- Recirculation damper servo sub-assembly - Air conditioning harness assembly - Air conditioning amplifier assembly |
Stored (30 seconds or more) |
- |
|
B1443 |
Air Outlet Damper Control Servo Motor Circuit |
- Damper servo sub-assembly (mode damper servo) - Air conditioning harness assembly - Air conditioning amplifier assembly |
Stored (30 seconds or more) |
- |
|
B1497 |
Communication Malfunction (Bus Ic) |
- Air conditioning harness assembly - Air conditioning amplifier assembly |
Stored (10 seconds or more) |
- |
|
U0100 |
Lost Communication with ECM |
- CAN communication system - ECM |
- |
- |
|
U0142 |
Lost Communication with Main Body ECU |
- CAN communication system - Main body ECU (multiplex network body ECU) |
- |
- |
|
U0155 |
Lost Communication with Combination Meter |
- CAN communication system - Combination meter assembly |
- |
- |
|
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.