Clutch Interlock/Upstop Switch

Service Diagnosis-Clutch Interlock/Upstop Switch:

OVERVIEW

Fig. 5:

Fig. 6:

The clutch interlock/upstop switch is an assembly consisting of two switches: an engine starter inhibit switch (clutch interlock) and a clutch pedal upstop switch (Fig. 5). The switch assembly is located in the clutch/brake pedal bracket assembly (Fig. 6), each switch being fastened by four plastic wing tabs.

CLUTCH INTERLOCK SWITCH
Mechanical Test
1. With the park brake set and the transaxle IN NEUTRAL, turn the ignition key to the start position. The engine starter should not crank with the clutch pedal at rest (not depressed). If the starter cranks, proceed to the electrical test to determine whether the switch is defective or the circuit is shorted. If the vehicle does not crank, proceed to the next step.
2. With the park brake set and the transaxle IN NEUTRAL, fully depress the clutch pedal and turn the ignition key to the start position. The engine starter should crank. If the starter does not crank, visually inspect the clutch pedal for obstructions (floor mat, etc.). Also make sure the clutch pedal blade contacts and fully

Electrical Test
1. Move ignition key to the "OFF/LOCK" position and remove key.
2. Set park brake.
3. Disconnect the clutch interlock/upstop switch connector.
4. Using an ohmmeter, check for continuity between terminals 2 & 3 with the interlock switch not depressed (clutch pedal at rest). There should be no continuity between the terminals (open circuit).
5. Fully depress the clutch pedal to close the switch at least 1.25 mm (0.050 inch). The ohmmeter should show continuity (0 ohms).
6. If ohmmeter readings do not fall within these ranges, the switch assembly is defective and should be replaced. If the switch tests ok, wiring is defective. Refer to Wiring Diagrams and repair defective wiring.

UPSTOP SWITCH
Mechanical Test
1. Raise vehicle on hoist.
2. Start engine and operate speed control to maintain speed.
3. Depress clutch pedal at least 33 mm (1.30 inch). Speed control operation should terminate. If speed control does not terminate, the unstop switch is defective or the related wiring is shorted. Proceed to the upstop switch electrical test.

Electrical Test
1. Move ignition key to the "OFF/LOCK" position and remove key.
2. Set park brake.
3. Disconnect the clutch interlock/upstop switch connector.
4. Using an ohmmeter, check for continuity between terminals 1 & 2 with the upstop switch depressed (clutch pedal at rest). The ohmmeter should show continuity (0 ohms).
5. Depress the clutch pedal at least 33 mm (1.30 inch) check for continuity between terminals 1 & 2. There should be no continuity between the terminals (open circuit).
6. If ohmmeter readings do not fall within these ranges, the switch assembly is defective and should be replaced. If the switch tests ok, wiring is defective. Refer to Wiring Diagrams and repair defective wiring.