GMC 15027967 Switch,Clutch Pedal Position

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To check the Park/Neutral switch, first, ensure that it prevents the engine from starting in any gear other than Park or Neutral. Raise the vehicle and securely place it on jack stands, then unplug the electrical connector from the Park/Neutral switch. Use an ohmmeter to check continuity across the indicated switch terminals. There should be continuity with the shift lever in Park or Neutral, and no continuity in any other position. If the switch doesn't operate as described, try adjusting it before retesting, and if it still fails, replace it. For removal, apply the parking brake, place the shift lever in Neutral, disconnect the battery cable, raise the vehicle on jack stands, remove the nut and manual lever, unplug the electrical connector from the switch, and remove the switch retaining bolts. Slide the switch off the manual shaft. Installation involves using a special adjustment tool, aligning the switch with the manual shaft flats, sliding it onto the manual shaft, and securing it with mounting bolts. Remove the adjustment tool and complete the remaining installation steps, tightening the manual lever retaining nut to the specified torque.

Try to start the engine in each gear. The engine should crank only in Park or Neutral. Make sure the steering column lock allows the key to go into the Lock position only when the shift lever is in Park. The ignition key should come out only in the Lock position.

If any component fails these checks, replacement may be necessary.

The ignition key should come out only in the Lock position.

For 1995 and 1996 models, raise the vehicle and securely place it on jack stands, then unplug the electrical connector from the Park/Neutral switch. Use an ohmmeter to check continuity across the indicated switch terminals. There should be continuity with the shift lever in Park or Neutral, and no continuity in any other position, except for Reverse, where continuity is expected for the backup lights.

The wiring should be disconnected, and the actuator pried off of the cable shift cam and steering column.

Make sure the steering column lock allows the key to go into the Lock position only when the shift lever is in Park.

The knock sensors detect engine knock. To check them, you should check for reference voltage and resistance.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

The engine should crank only in Park or Neutral.

Finally, the knee bolster should be reinstalled.

The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.