Clutch Switch: Testing and Inspection

DIAGNOSIS AND TESTING-CLUTCH INTERLOCK/UPSTOP SWITCH

LHD and DIESEL LHD & RHD





NOTE: 2.4L-equipped models (including Turbo) do not use the clutch pedal upstop switch/feature. These vehicles will only utilize the starter inhibit (interlock) feature.

The clutch interlock/upstop switch (1) is an assembly consisting of two switches: an engine starter inhibit switch (interlock) (2) and a clutch pedal upstop switch (1). The switch assembly is located in the clutch/brake pedal bracket assembly, each switch being fastened by four plastic wing tabs. The connector (3) is secured to the pedal/bracket assembly by a plastic retainer.

RHD-2.4L





The RHD clutch interlock/upstop switch (1) consists of a single, multi-function switch that is activated by the hydraulic clutch master cylinder push rod.

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.) and for proper installation of the master cylinder push rod/bushing on the pedal pin. Also make sure the clutch pedal lever contacts and fully closes the switch for LHD and Diesel RHD applications.

Electrical Test




3. Move ignition key to the "OFF/LOCK" position and remove key.
4. Set park brake.
5. Disconnect the clutch interlock/upstop switch connector (1).
6. 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).
7. Fully depress the clutch pedal to close the switch. The switch button should compress at least 1.25 mm (0.050 in.) for LHD applications. The ohmmeter should show continuity (0 ohms).
8. For RHD applications, disconnect the push rod from the pedal pin and actuate the push rod by hand to close the switch. The ohmmeter should show continuity (0 ohms).
9. If ohmmeter readings do not fall within these ranges, the switch assembly, or the pedal bracket assembly, is defective and should be replaced. If the switch tests ok, wiring is defective.

UPSTOP SWITCH

NOTE: 2.4L-equipped models (including Turbo) do not use the clutch pedal upstop switch/feature. These vehicles will only utilize the starter inhibit (interlock) feature. PCM software will not recognize the upstop switch on 2.4L vehicles that have the switch, so upstop switch testing is not required. Proceed to Speed Control Diagnosis & Testing.

Mechanical Test (1.6L and 2.2L Turbo Diesel Models)

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 in.). Speed control operation should terminate. If speed control does not terminate, the upstop switch is defective or the related wiring is shorted. Proceed to the upstop switch electrical test.

Electrical Test (1.6L and 2.2L Turbo Diesel Models)

4. Move ignition key to the "OFF/LOCK" position and remove key.
5. Set park brake.
6. Disconnect the clutch interlock/upstop switch connector.
7. 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).
8. Depress the clutch pedal at least 33 mm (1.30 in.) and check for continuity between terminals 1 & 2. There should be no continuity between the terminals (open circuit).
9. 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.

Service Diagnosis - Clutch Interlock/Upstop Switch: