SSANGYONG Rexton Y200 Manual page 953

4E-74 ABS AND TCS
DIAGNOSTIC TROUBLE CODE (DTC) 121 - VALVE RELAY CIRCUIT
Circuit Description
When the ABS is active, the valve relay provides
voltage to actuate the solenoid valves. The valves do
not use this voltage unless the ABS control module
provides the ground for each solenoid coil.
DTC 12 will set if the valve relay voltage is low or if the
relay supply line is at 12 volts when the ABS control
module is not requesting it. This DTC will also set if
the ABS control module detects three or more solenoid
valve circuits are open or shorted during the self-test.
Diagnosis
This procedure checks whether there is a poor ground
connection for the electronic brake control module
(EBCM).
FAULT
Cause(s)
•
A connector terminal is corroded.
•
The wiring harness is damaged.
•
The ground terminal is not conducting properly.
•
The valve relay is defective.
•
The EBCM is defective.
Action Taken When the DTC Sets
ABS/TCS is disabled, and the ABS warning lamp is
turned ON for the remainder of the ignition cycle. If
the failure is intermittent, the control module will enable
the system at the next ignition cycle and set a history
DTC 12.
Diagnostic Aids
It is very important to perform a thorough inspection
of the wiring and the connectors. Failure to do so may
result in misdiagnosis, causing part replacement with
the reappearance of the malfunction.
YAD4E240
SSANGYONG Y200