Toyota Tacoma 2015-2018 Service Manual: ECM Communication Circuit Malfunction (C1203)

DESCRIPTION

The circuit is used to send TRAC and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) through the CAN communication system.

for 4WD or w/ Rear Differential Lock:

The rear differential lock identification signal is sent from the 4 wheel drive control ECU to the skid control ECU (brake actuator assembly) via the CAN communication system.

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).

HINT:

When DTC C1203, inspect and repair the trouble areas indicated.

PROCEDURE

(a) Check that the proper ECM is installed.

B

GO TO STEP 3

C

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

A

(a) Check that a proper 4 wheel drive control ECU is installed.

B

REPLACE 4 WHEEL DRIVE CONTROL ECU

A

(a) Check if the brake actuator assembly had been replaced before the DTC was recorded.

B

GO TO STEP 5

A

(a) Clear the DTC (See page ).

(b) Turn the ignition switch off.

(c) Check if the same DTC is recorded (See page ).

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

(a) Perform initialization and calibration (See page ).

NEXT

(a) Clear the DTC (See page ).

(b) Turn the ignition switch off.

(c) Check if the same DTC is recorded (See page ).

A

END

B

REPLACE BRAKE ACTUATOR ASSEMBLY