GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Sending Units and Sensors

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Fig. Fig. 1 Engine compartment component locations-Vin C engine



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Fig. Fig. 2 Engine compartment component locations-Vin L engine



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Fig. Fig. 3 Engine compartment component locations-Vin 1 engine

REMOVAL & INSTALLATION



Throttle Position Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector from the tps.
  4.  
  5. Remove the tps attaching screws and remove the tps.
  6.  

To install:

  1. Position the throttle valve in the normal closed idle position, and install the tps on the throttle body assembly, making sure the tps pickup lever is located above the tang on the throttle actuator lever.
  2.  
  3. Install the tps retainer and attaching screws using a thread locking compound on the screws. Loctite® 262 or equivalent should be used. Do not tighten the attaching screw until the tps is adjusted.
  4.  

Tps adjustment
  1. With the tps attaching screws loose, install 3 jumper wires between tps and harness connector.
  2.  
  3. With the ignition switch on , use a digital voltmeter connected to terminals B and C and adjust tps to obtain 0.40 -0.05 volts.
  4.  
  5. Tighten the attaching screws, then recheck reading to ensure the adjustment has not changed.
  6.  

If the tps is being adjusted only, remove screws, add thread locking compound (Loctite® or equivalent), then reinstall the screws.

  1. With the ignition switch off, remove the jumper wires and connect the harness to the tps.
  2.  

Tps output check test with scan tool.

The following check should be performed only when the throttle body or tps has been replaced.

  1. Use a suitable scan tool to read the tps voltage.
  2.  
  3. With the ignition switch on and the engine off, the tps voltage should be less than 1.25 volts.
  4.  
  5. If the voltage reading is higher than specified, replace the throttle position sensor.
  6.  

Idle Air Control (IAC) Valve
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the iac valve.
  4.  
  5. Remove the iac attaching screws and remove the iac.
  6.  

Before installing the new iac valve, measure the distance that the valve is extended. Measurement should be made from the motor housing to the end of the cone. Distance should be no greater than 1 1 / 8 Inch (28mm). If the cone is extended too far, adjustment is required or damage may occur to the valve when installed. To adjust, manually compress the pintle with your hand to achieve the correct length.

To install:

  1. Use a new O-ring on the iac and install the iac.
  2.  
  3. Install the iac attaching screws and tighten to 27 inch lbs. (3Nm).
  4.  
  5. Connect the electrical connector to the iac valve.
  6.  
  7. Start the engine and allow the engine to reach operating temperature.
  8.  
  9. The ecm will reset the iac, whenever the ignition switch is turned on and then off .
  10.  

Camshaft Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the serpentine drive belt and water pump drive pulley.
  4.  
  5. Disconnect the electrical connector at the sensor.
  6.  
  7. The cam sensor is located on the timing cover, behind the water pump, near the camshaft sprocket. Remove the cam sensor mounting bolt and remove the sensor from the engine.
  8.  
  9. Installation is the reverse order of the removal procedure.
  10.  
  11. Prior to installing the sensor, inspect the O-ring seal and replace as required.
  12.  

Coolant Temperature Sensor

CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air induction tube from the throttle body.
  4.  
  5. Disconnect the electrical connector at the coolant sensor.
  6.  
  7. Remove the threaded temperature sensor from the engine thermostat housing.
  8.  

To install:

  1. Check the sensor with the tip immersed in water at 50°F (10°C). The resistance across the terminals should be 5670 ohms. If not within specifications, replace the sensor.
  2.  
  3. Apply a coating of an approved thread sealant on the threads of the temperature sensor. Install the sensor.
  4.  
  5. Reconnect the sensor connector and the negative battery cable.
  6.  

Knock Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support it safely.
  4.  
  5. Disconnect the esc wiring harness from the knock sensor.
  6.  
  7. Remove the knock sensor from the engine block.
  8.  

To install:

Do not apply thread sealant to sensor threads. Sensor is precoated at factory applying additional sealant will affect the sensors ability to detect detonation.

  1. Install the knock sensor into the engine block.
  2.  
  3. Connect the electrical connector to the knock sensor.
  4.  
  5. Lower the vehicle. Connect the negative battery cable.
  6.  

Mass Air Flow (MAF) Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fresh air duct from the throttle body and air cleaner assembly.
  4.  
  5. Disconnect the electrical connector to the maf sensor.
  6.  
  7. Remove the sensor retaining screws and remove the sensor from the throttle body.
  8.  
  9. Installation is the reverse order of the removal procedure. Do not attempt to remove the gasket, it is not removable or serviced separately.
  10.  

Oxygen Sensor
  1. To ease removal of the oxygen sensor and prevent thread damage, run the engine for a short time to heat up the exhaust system. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector.
  4.  
  5. Carefully back out the oxygen sensor. Do not use solvents to clean the sensor. If the sensor is dropped, it should be replaced.
  6.  

To install:

  1. Coat the threads of the oxygen sensor with anti-seize compound.
  2.  
  3. Carefully thread the sensor on by hand and tighten with a wrench.
  4.  
  5. Connect the connector.
  6.  

Oil Pressure Sending Unit
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the wiring to the sending unit.
  4.  
  5. Unscrew the sending unit from the engine.
  6.  

To install:

  1. Apply teflon tape to the sending unit.
  2.  
  3. Carefully thread the sensor on by hand and tighten with a wrench. Do not torque past 106 inch lbs. (12 Nm).
  4.  
  5. Check the oil pressure gauge and/or warning light for proper operation.
  6.  

 
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