[gti]

BC–90 BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
If a malfunction in the engine control system is detected, the operations of VSC and TRC are prohibited
by the fail-safe function. When the signals from the engine are input normally, the fail-safe is canceled and
the DTC is not stored.
INSPECTION PROCEDURE
(a) Using the DATA LIST of the intelligent tester, check for
any momentary interruption in the wire harness
corresponding to the DTC (see page BC-23).
Skid control ECU
OK:
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the
sensor and connector.
NG
OK
(a) Clear the DTC (engine control system).
(b) Check the DTC (engine control system).
Result
B
A
DTC C1201/51 Engine Control System Malfunction
DTC No. DTC Detection Condition Trouble Area
C1201/51 Engine control system malfunction signal continues for
5 seconds.
Engine control system
1 CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
Item Measurement Item / Range (Display) Normal Condition
EFI COM OPN EFI communication open detection / ERROR or
NORMAL
ERROR: Momentary interruption
NORMAL: Normal
Go to step 3
2 CHECK DTC FOR ENGINE CONTROL SYSTEM
Result Proceed to
DTC is output A
DTC is not output B
REPLACE ECM
REPAIR ENGINE CONTROL SYSTEM
BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM BC–91
BC
NEXT
(a) Clear the DTC
(b) Perform a road test.
(c) Check if the same DTC is recorded (see page BC-47).
Result
B
A
3 REPAIR OR REPLACE HARNESS AND CONNECTOR (ECM - SKID CONTROL ECU)
4 RECONFIRM DTC
Result Proceed to
DTC is not output A
DTC C1201/51 is output B
Go to step 2
END