Pinpoint Test E: A Single Speed Control Button Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

E1 CHECK THE SPEED CONTROL SWITCH

Key in OFF position.
Disconnect: Speed Control Actuator C122.

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 SPECIFICATIONS

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 buttons pressed	Infinite

Fig 1: Checking Speed Control Switch

Courtesy of FORD MOTOR CO.

Are the speed control switch resistance values OK?

Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR in this article. TEST the system for normal operation.

No : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH in this article. TEST the system for normal operation.