Cadillac 24229422 Switch,Parking/Neutral Position & Back Up Lamp

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To adjust the Park/Neutral switch on 1995 and earlier models, start by ensuring that the engine only starts in Park or Neutral. The switch is located inside the vehicle at the bottom of the steering column. Apply the parking brake and place the gear selector in Neutral. Rotate the switch clockwise to the Low position and then move the gear selector to Park, which will ratchet the switch to the correct position. If the switch does not operate correctly after adjustment, it may need to be replaced. To remove the switch, apply the parking brake and place the gear selector in Neutral. Disconnect the electrical connectors and spread the tangs on the housing to pull the switch out. Before installing the switch, align the tang on the switch with the hole in the shift tube. Installation involves pressing the switch onto the steering column, connecting the electrical connectors, and adjusting the switch. For 1996 and later models, removal requires applying the parking brake, placing the gear selector in Neutral, disconnecting the battery cable, raising the vehicle, removing the lever from the manual lever shaft, disconnecting the electrical connector, and removing the switch retaining bolts. The switch can then be removed from the transmission, ensuring the end of the shaft is free of burrs. Use a file to deburr the shaft if necessary. Installation involves using a special adjustment tool, aligning the switch hub flats with the flats on the manual shaft, securing the switch with mounting bolts, removing the adjustment tool, installing the manual shift lever, and checking the switch operation.

To check the Park/Neutral switch, first ensure that it prevents the engine from starting in any gear other than Park or Neutral (also activates the backup lights on 1995 and later models when in Reverse). On 1994 models, remove the steering column insulator panel and unplug the electrical connector from the switch terminals. On 1995 and later 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 switch terminals (for 1994 models) or the indicated switch terminals (for 1995 and 1996 models). There should be continuity with the shift lever in Park or Neutral, and no continuity in any other position (except for Reverse on 1995 and later models, where continuity is expected for the backup lights). If the switch doesn't operate as described for 1994 models, replace it; for 1995 and 1996 models, try adjusting it before retesting, and if it still fails, replace it. For removal of the 1994 model switch, unplug the electrical connector and pull the switch straight out of the steering column, then align the actuator with the holes in the shift tube, press down on the front of the switch until the tangs snap into the rectangular holes in the steering column jacket. For adjustment, move the shift lever to the Park position, allowing the main housing and housing back to ratchet the switch to the correct position. Installation is the reverse of removal. For the removal of 1995 and later models, 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.

The intake air temperature (IAT) sensor acts as a thermistor. To check it, you can measure its resistance at different temperatures to ensure it changes as expected. Additionally, you should monitor the IAT sensor using a scan tool to verify its performance.

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

The Neutral Safety Switch used on these models is either a clutch interlock switch (manual transmission-equipped models) or a neutral start switch (automatic transmission equipped models). The clutch interlock switch prevents the engine from being cranked unless the clutch is depressed. The neutral start switch prevents the engine from being cranked unless the gear selector is in Park or Neutral. If the vehicle is equipped with an automatic transmission, try to start the vehicle in each gear. The engine should crank only in Park or Neutral. If it cranks in any other gear, the neutral start switch is faulty or in need of adjustment. If the vehicle is equipped with a manual transmission, place the shift lever in Neutral. The engine should crank only when the clutch pedal is depressed. If it cranks without the pedal being depressed, the switch, located near the top of the clutch pedal arm, is probably faulty. If the vehicle is equipped with an automatic transmission, 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.

Firmly apply the parking brake and set the shift lever to Neutral. Pry the shift cable from the transmission shift lever ball-stud, remove the nut retaining the shift lever to the shaft, and take off the lever. Disconnect the electrical connector, remove the mounting bolts, and slide the switch off the shaft. Lightly file the shaft's end if needed. To install the switch with the shaft still in Neutral, align the switch's flats with those on the shaft, lower the switch onto the shaft, and install the bolts. Adjust the switch's alignment by moving it as necessary. Reinstall the shift lever and cable, verify starting in Park and Neutral, and adjust further if needed by loosening the mounting bolts and rotating the switch slightly until it functions correctly.

Remove the manual lever retaining nut and remove the manual lever from the manual shaft.

The two types of starter safety switches used on these models are the clutch interlock switch for manual transmission-equipped models and the neutral start switch for automatic transmission-equipped models.

Firmly apply the parking brake and set the shift lever to Neutral. Pry the shift cable from the transmission shift lever ball-stud, remove the nut retaining the shift lever to the shaft, and take off the lever. Disconnect the electrical connector, remove the mounting bolts, and slide the switch off the shaft. Lightly file the shaft's end if needed. To install the switch with the shaft still in Neutral, align the switch's flats with those on the shaft, lower the switch onto the shaft, and install the bolts. Adjust the switch's alignment by moving it as necessary. Reinstall the shift lever and cable, verify starting in Park and Neutral, and adjust further if needed by loosening the mounting bolts and rotating the switch slightly until it functions correctly.

If the Park/Neutral switch doesn't operate as described for 1994 models, it should be replaced.

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

The checking procedures for various engine sensors and components are as follows: The engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can trigger trouble codes. To check it, measure the resistance while cold and warm, and ensure the reference voltage from the PCM is around 5.0 volts. The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. Check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. The intake air temperature (IAT) sensor acts as a thermistor, and you can measure its resistance at different temperatures to ensure it changes as expected. Also, monitor the IAT sensor using a scan tool to verify its performance. The oxygen sensor in the exhaust monitors oxygen content, and you can check its millivolt signal while the engine warms up. Inspect the oxygen sensor heater and ensure it receives proper voltage. The vehicle speed sensor (VSS) provides speed data to the PCM and can be checked for reference voltage. The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output. Finally, the knock sensors detect engine knock and should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

If the Park/Neutral switch doesn't operate as described for 1994 models, it should be replaced.

Try to start the engine in each gear.

For 1996 and later models, removal requires applying the parking brake, placing the gear selector in Neutral, disconnecting the battery cable, raising the vehicle, removing the lever from the manual lever shaft.

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 manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. To check it, you should check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes.

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