Pinpoint Test K: The Speed Control Switch Is Inoperative - Set/ACCEL
WARNING: This page is about a different car, the 2004 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Test Step
K1 CHECK THE SPEED CONTROL ACTUATOR SWITCH SET_ACL PID
- Key in ON position.
- Monitor the speed control actuator SET_ACL PID. Press and release the speed control actuator switch SET/ACCEL button while slightly turning the steering wheel from side to side.
- Does the diagnostic tool indicate ACTIVE with the speed control actuator switch pressed and not ACTIVE with the speed control actuator switch released?
Result / Action to Take
Yes
System is OK.
No
GO to K2.
Test Step
K2 CHECK THE SPEED CONTROL ACTUATOR SWITCH SET/ACCEL
- Key in OFF position.
- Disconnect: Speed Control Actuator C122.
- Measure the resistance between speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side, and speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side, while pressing the speed control actuator switch SET/ACCEL and slightly turning the steering wheel from side to side.
- Is the resistance between 612 and 748 ohms with SET/ACCEL pressed and greater than 10,000 ohms with SET/ACCEL released?
Result / Action to Take
Yes
INSTALL a new speed control actuator. REFER to SPEED CONTROL SERVO . TEST the system for normal operation.
No
INSTALL a new speed control actuator switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.