Subaru Impreza 2002 Service Manual page 3728

DIAGNOSTICS CHART WITH TROUBLE CODE
8. Diagnostics Chart with Trou-
ble Code
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
module.
• Failure of built-in CPU RAM of cruise control
module.
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.)
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
CC-29