Pinpoint Test H: The Speed Control Actuator Does Not Respond To The Diagnostic Tool

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

H1 CHECK THE SPEED CONTROL ACTUATOR C122 FOR DAMAGE

Key in OFF position.
Disconnect: Speed Control Actuator C122.
Inspect the speed control actuator C122 for damage.
Is the speed control actuator C122 OK?

Result / Action to Take

Yes

GO to H2.

REPAIR the speed control actuator C122. CARRY OUT the diagnostic tool data link test.

Test Step

H2 CHECK CIRCUITS 914 (TN/OG) AND 915 (PK/LB) FOR AN OPEN BETWEEN THE DLC C251 AND THE SPEED CONTROL ACTUATOR C122

Key in OFF position.
Disconnect: Speed Control Actuator C122.
Measure the resistance between the speed control actuator C122 pin 1, circuit 914 (TN/OG), harness side and the DLC C251 pin 2, circuit 914 (TN/OG), harness side.

Fig 1: Checking Circuit 914 (TN/OG) For An Open Between DLC C251 And Speed Control Actuator C122
Courtesy of FORD MOTOR CO.
Measure the resistance between the speed control actuator C122 pin 2, circuit 915 (PK/LB), harness side and the DLC C251 pin 10, circuit 915 (PK/LB), harness side.

Fig 2: Checking Circuit 915 (PK/LB) For An Open Between DLC C251 And Speed Control Actuator C122
Courtesy of FORD MOTOR CO.
Are the resistances less than 5 ohms?

Result / Action to Take

Yes

GO to H3.

REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.

Test Step

H3 CHECK FOR CORRECT SPEED CONTROL ACTUATOR OPERATION

Disconnect all the speed control actuator connectors.
Check for:
- corrosion
- pushed-out pins
Connect all the speed control actuator connectors and make sure they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?

Result / Action to Take

Yes

INSTALL a new speed control actuator. REFER to SPEED CONTROL . CARRY OUT the diagnostic tool data link test.

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.