Subaru Forester 2004 - Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CC(H4SO)-29
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
8. Diagnostic Procedure with
Diagnostic Trouble Code
(DTC)
A: DTC 21, 24, 25 AND 2A CRUISE
CONTROL MODULE BUILT-IN RE-
LAY, CPU RAM
DIAGNOSIS:
• Poor welding of built-in relay of cruise control mod-
ule.
• Failure of built-in CPU RAM of cruise control mod-
ule.
TROUBLE SYMPTOM:
• Cruise control is canceled and memorized cruise
speed is also canceled.
• Once cruise control is canceled, cruise control
cannot be set until the ignition switch and cruise
control main switch turns OFF, and then turns ON
again.
NOTE:
Check input/output signal and vehicle speed signal
with select monitor. When signals are in good con-
dition, failure is in cruise control module. (Check
the power supply and ground conditions of cruise
control module.)