A19-A24

A19 Check VSS Circuit
- Measure resistance between Pin 3 (Circuit 150 [DG/W]) and Pin 10 (Circuit 57 [BK]).
- Is resistance between 200 and 300 ohms?

Yes
GO to A21
No
GO to A20

A20 Check VSS
- Remove VSS connector.
- Measure resistance across VSS terminals.
- Is resistance between 200 and 300 ohms?

Yes
CHECK for opens or shorts in Circuit 150 (DG/W) or 563 (O/Y).
No
REPLACE vehicle speed sensor.

A21 Check For Broken Or Binding Cable
- Remove speed control actuator from speed control servo.
- Check for broken or binding cable by pulling on cable ball slug to ensure throttle moves freely.
- Is cable OK?

Yes
REPLACE speed control servo
No
REPLACE speed control actuator.

A22 Check Coast Switch Operation
- Disconnect 14290 harness connector from speed control servo.
- With COAST switch pressed, measure resistance between Pin 5 (Circuit 151 [LB/BK]) and Pin 6 (Circuit 150 [DG/W]) while rotating steering wheel through full range.
- Is resistance between 114 and 126 ohms?

Yes
GO to A23
No
REPLACE speed control actuator switch assembly. RECONNECT speed control servo

A23 Check Command Switch Return Circuit
- Measure resistance between Pin 6 (Circuit 248 [T/O]) and Pin 10 (GND, Circuit 57 [BK]).
- Is resistance greater than one ohm?

Yes
REPLACE speed control servo.
No
SERVICE short in Circuit 248 (T/O). RECONNECT speed control servo.

A24 Check Set/Accel Switch Operation
- Disconnect 14290 harness connector from speed control servo.
- With Set/Accel switch pressed, measure resistance between Pin 5 (Circuit 151 [LB/BK]) and Pin 6 (Circuit 248 [T/O]) while rotating steering wheel through full range.
- Is resistance between 646 and 714 ohms?

Yes
GO to A25 A25-A28
No
REPLACE speed control actuator switch assembly. RECONNECT speed control servo.