Tacoma

Toyota Tacoma 2015-2018 Brake Workshop Manual

Last Modified: 11-13-2015 6.6 C Doc ID: RM000005VAD000X
Model Year Start: 2016 Model: Tacoma Prod Date Range: [08/2015 - ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster): C1203; ECM
Communication Circuit Malfunction; 2016 MY Tacoma [08/2015 - ]
DTC C1203 ECM Communication Circuit Malfunction
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:
Engine model information sent
from the ECM does not match the
information stored in the skid
control ECU.
The rear differential lock
identification signal sent from the
4 wheel drive control ECU does
not match the information stored
in the skid control ECU.*
No system information stored in
the skid control ECU.
Incorrect installation of the skid
control ECU, 4 wheel drive control
ECU* or ECM.
ECM malfunction or ECM
with incorrect part
number installed
4 wheel drive control ECU
malfunction or 4 wheel
drive control ECU with
incorrect part number
installed*
Skid control ECU (Brake
actuator assembly)
*: for 4WD or w/ Rear Differential Lock
HINT:
DTC will be output when conditions for any of the patterns in the table above are met.
INSPECTION PROCEDURE
NOTICE:
W
hen replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store
system information
.
HINT:
When DTC C1203, inspect and repair the trouble areas indicated.
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