Pinpoint Test H: The Speed Control Switch Is Inoperative

Speed Control

Pinpoint Tests

Pinpoint Test H: The Speed Control Switch Is Inoperative

Normal Operation

The speed control actuator sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent through the clockspring to circuit RES08 (GN/BN).

This pinpoint test is intended to diagnose the following:

- Speed control switch
- Speed control actuator



PINPOINT TEST H: THE SPEED CONTROL SWITCH IS INOPERATIVE

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H1 CHECK THE SPEED CONTROL SWITCHES


- Disconnect: Speed Control Actuator C122.
- Measure the resistance between the speed control actuator C122-5, circuit VES10 (WH), harness side and the speed control actuator C122-6, circuit RES08 (GN/BN), harness side while pressing the speed control switches as follows:





- Are the speed control switch resistance values OK?

Yes
INSTALL a new speed control actuator. REFER to Speed Control Actuator Service and Repair. TEST the system for normal operation.

No
GO to H2

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H2 CHECK THE CIRCUITS TO THE CLOCKSPRING FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: Clockspring C218a.
- Measure the resistance between the speed control actuator, harness side and the clockspring, harness side; and between the speed control actuator, harness side and ground as follows:





- Is the resistance less than 5 ohms between the speed control actuator and the clockspring, and greater than 10,000 ohms between the speed control actuator and ground?

Yes
GO to H3.

No
REPAIR the circuit. TEST the system for normal operation.

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H3 CHECK THE SPEED CONTROL SWITCHES


- Disconnect: Clockspring C218c.
- Measure the resistance between the clockspring C218c-3, harness side and the clockspring C218c-8, harness side with no switches pressed and then while pressing the speed control switches as follows:





- Are the speed control switch resistance values OK?

Yes
INSTALL a new clockspring. TEST the system for normal operation.

No
INSTALL a new speed control switch. REFER to Speed Control Switch Speed Control Switch. TEST the system for normal operation.

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