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.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1203 |
ECM Communication Circuit Malfunction |
Any of the following is detected:
|
|
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
1. |
CHECK PART NUMBER (ECM) |
(a) Check that the proper ECM is installed.
Result
Result |
Proceed to |
---|---|
Proper ECM is installed (for 4WD or w/ Rear Differential Lock) |
A |
Proper ECM is installed (except 4WD or w/o Rear Differential Lock) |
B |
Proper ECM are not installed |
C |
B | ![]() |
GO TO STEP 3 |
C | ![]() |
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY |
|
2. |
CHECK PART NUMBER (4 WHEEL DRIVE CONTROL ECU) |
(a) Check that a proper 4 wheel drive control ECU is installed.
Result
Result |
Proceed to |
---|---|
Proper 4 wheel drive control ECU is installed |
A |
Proper 4 wheel drive control ECU are not installed |
B |
B | ![]() |
REPLACE 4 WHEEL DRIVE CONTROL ECU |
|
3. |
CHECK BRAKE ACTUATOR ASSEMBLY |
(a) Check if the brake actuator assembly had been replaced before the DTC was recorded.
Result
Result |
Proceed to |
---|---|
The brake actuator assembly is not replaced |
A |
The brake actuator assembly is replaced |
B |
B | ![]() |
GO TO STEP 5 |
|
4. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(b) Turn the ignition switch off.
(c) Check if the same DTC is recorded (See page
).
Result |
Proceed to |
---|---|
DTC C1203 is not output |
A |
DTC C1203 is output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
5. |
PERFORM INITIALIZATION AND CALIBRATION |
(a) Perform initialization and calibration (See page
).
|
6. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(b) Turn the ignition switch off.
(c) Check if the same DTC is recorded (See page
).
Result |
Proceed to |
---|---|
DTC C1203 is not output |
A |
DTC C1203 is output |
B |
A | ![]() |
END |
B | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
FCM Destination Information Unmatched (C1AA1)
DESCRIPTION
When the forward recognition camera is replaced with a new one, the new forward
recognition camera attempts to store country specification information received
from the main body ECU (multiplex network body ECU) and ECM. If the country specification
information stored in the forwa ...
Unable to Unlock Steering Wheel (Engine cannot Start)
DESCRIPTION
The steering lock actuator assembly activates the steering lock motor and moves
the lock bar into the steering column to lock the steering.
The steering may not unlock when the lock bar gets stuck in the lock hole of
the steering column. In this case, if the engine switch is turned ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Central Gateway ECU (Network Gateway ECU)
DTC Code
Detection Item
See page
B1003
ECU Malfunction
...