Chevrolet 15705308 Switch,Parking/Neutral Position & Back Up Lamp

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Ensure that the end of the shaft is free of burrs. Use a file to deburr the shaft if necessary.

The neutral start switch prevents the engine from being cranked unless the gear selector is in Park or Neutral.

Place the shift lever in Neutral, unplug the electrical connectors, spread the tangs on the housing, and lift the switch. Align the actuator on the switch with the hole in the shift tube, position the rear part of the switch to fit into the lower jacket's cutout, push down on the front to engage the two tangs, and move the shift lever to Park to complete the adjustment. Finally, plug in the electrical connectors.

The purpose of the starter safety switch is to prevent the engine from being cranked unless certain conditions are met.

Place the shift lever in Neutral, unplug the electrical connectors, spread the tangs on the housing, and lift the switch. Align the actuator on the switch with the hole in the shift tube, position the rear part of the switch to fit into the lower jacket's cutout, push down on the front to engage the two tangs, and move the shift lever to Park to complete the adjustment. Finally, plug in the electrical connectors.

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.

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

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.

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

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

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.