Throttle Position Sensor: Service and Repair

Description:

TPS Adjustment Metro W/ Upgraded Emissions:

Removal Procedure
1. Disconnect the negative (-) battery cable.
2. Disconnect the Intake Air Temperature (IAT) sensor electrical connector.
3. Disconnect the PCV hose from the Air Cleaner (ACL).
4. Disconnect the one bolt and the wing nut from the Air Cleaner (ACL) to the Throttle Body Fuel Injection (TBI) unit.
5. Remove the Air Cleaner (ACL) from the Throttle Body Fuel Injection (TBI) unit.
6. Disconnect the throttle Position (TP) sensor electrical connector.
7. Remove the two screws and the TP sensor from the TBI unit.

Installation Procedure
1. Install the TP sensor to the TB unit with the two screws, but do not tighten fully.
2. Connect the TP sensor electrical connector.
3. Connect the PCV hose to the Air Cleaner (ACL).
4. Connect the IAT sensor electrical connector.
5. Install the Air Cleaner (ACL) to the TBI unit.
6. Secure the Air Cleaner (ACL) with the one bolt and the wing nut. Tighten the ACL bracket bolt to 10 Nm (7.5 lb. ft.).
7. Connect the negative (-) battery cable. Tighten the negative (-) battery cable-to-negative (-) battery terminal retainer to 5.5 Nm (4 lb. ft.).

Description:

Adjustment Procedure
Using a Digital Multimeter (J 39200 or equivalent) perform the following steps:
1. Insert a 3.5 mm (0.14-inch) feeler gage between the throttle stop screw and the throttle lever.
2. Inspect the Idle Speed Control (ISC) motor plunger. If the ISC motor plunger is contacting the throttle lever screw, then the engine must be brought to operating temperature.
3. Back probe the TP sensor signal circuit at the PCM connector to ground.
4. Turn ON the ignition.
5. While observing TP sensor voltage on the DVM, turn the TP sensor until the voltage reading is 0.98 to 1.02 volts. Tighten the TP sensor screws to 2.0 Nm (18 lb. in.). Using a scan tool perform the following steps:
1. Insert a 3.5 mm (0.14-inch) feeler gage between the throttle stop screw and the throttle lever.
2. Inspect the Idle Speed Control (ISC) motor plunger. If the ISC motor plunger is contacting the throttle lever screw, then the engine must be brought to operating temperature.
3. Connect a scan tool to the Data Link Connector (DLC) and select the TP sensor voltage parameter.
4. Turn ON the ignition.
5. While observing TP sensor voltage on the scan tool, turn the TP sensor until the voltage reading is 0.98 to 1.02 volts. Tighten the TP sensor screws to 2.0 Nm (18 lb. in.).