Pinpoint Test F: The Speed Control Switch Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

F1 CHECK THE SPEED CONTROL SWITCH

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

Measure the resistance between the speed control actuator C122 pin 5, circuit 916 (LG), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side while pressing the inoperative speed control switch. Use the following table for the speed control switch in question.

SPEED CONTROL SWITCH AND RESISTANCE VALUE SPECIFICATION

Speed Control Switch	Resistance Value
COAST	Between 108 and 132 ohms
SET/ACCEL	Between 612 and 748 ohms
RESUME	Between 1,980 and 2,420 ohms
OFF	Less than 5 ohms

Fig 1: Measuring Resistance Between Speed Control Actuator C122 Pin 5, Circuit 916 (LG), Harness Side And Speed Control Actuator C122 Pin 6, Circuit 848 (DG/OG), Harness Side

Courtesy of FORD MOTOR CO.

Is the speed control switch resistance 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.