Toyota 4Runner: Diagnostic Trouble Code Chart

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Manual Air Conditioning System) / Diagnostic Trouble Code Chart

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
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 (-63.22°F) or less, DTC B1412 may be stored even though the system is normal.
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	-	-

Ambient Temperature Sensor Circuit (B1412)

DESCRIPTION The cooler thermistor (ambient temperature sensor) is installed in the front part of the cooler condenser assembly. This sensor is connected to the air conditioning amplifier assembly ...

Compressor Lock Sensor Circuit (B1422)

SYSTEM DESCRIPTION The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication. The air conditioning amplifier assembly reads the difference between comp ...

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