Pinpoint Test E: A Single Speed Control Button Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

E1 CHECK THE SPEED CONTROL SWITCH

Key in OFF position.
Disconnect: Speed Control Actuator C122

Fig 1: Checking Speed Control Switch

Courtesy of FORD MOTOR CO.

Measure the resistance between the speed control actuator C122-5, circuit 151 (LB/BK), harness side and the speed control actuator C122-6, circuit 848 (DG/OG), harness side while pressing the speed control switch as follows:

Speed Control Switch	Resistance Value
COAST	Between 114 and 126 ohms
SET/ACCEL	Between 646 and 714 ohms
RESUME	Between 2,090 and 2,310 ohms
OFF	Less than 5 ohms
No switches pressed	Infinite

Are the speed control switch resistance values OK?

YES : INSTALL a new speed control actuator. REFER to Speed Control Actuator . TEST the system for normal operation.
NO : INSTALL a new speed control switch. REFER to Speed Control Switch . TEST the system for normal operation.