Throttle Position Sensor: Adjustments
DISPLAY PANELSElectronic Climate Control (ECC) Panel:
Fuel Data Center:
OPERATING ON-BOARD DIAGNOSTICS
Diagnostic Flow Diagram - Part 1 Of 3:
Diagnostic Flow Diagram - Part 2 Of 3:
Diagnostic Flow Diagram - Part 3 Of 3:
ADJUSTING TPS
NOTE: Engine should be at normal operating temperature. This adjustment should only be performed when the TPS has been replaced or when required to do so by diagnostic tests.
1. Turn the engine "OFF", key "ON". Enter diagnostics and select PCM/ECM override E.5.3, ISC Motor. Press the "Cooler" button on the Electronic Climate Control (ECC) to retract the ISC motor to the minimum air setting. The FDC will change from "50" to "00". The ISC motor will slowly retract (about 20 seconds) to a fully retracted position. Verify that the throttle lever is resting on the minimum idle speed screw. With the ISC plunger fully retracted, disconnect the ISC harness.
2. If the engine stalls, minimum idle speed may need to be reset.
3. With the engine running at the minimum rpm setting, check TPS voltage using TPS jumper harness tool J 38490 or equivalent and a Digital Volt Meter.
4. If the voltage is 0.45 to 0.55 volts go to step 8.
5. Using a T-25 L-shape torx wrench, loosen the TPS screws just enough to permit the sensor to be rotated. Open the throttle and let it snap shut against the minimum air screw. Adjust the TPS so the voltage is 0.45 to 0.55 volts.
6. Tighten the TPS mounting screws with the sensor in the adjusted position.
7. Recheck the parameter to be sure the TPS voltage is 0.45 to 0.55 volts.
8. Reconnect the ISC harness. Start the engine and allow the ISC to self adjust.
NOTE: If the Minimum Idle Speed or TPS were adjusted, perform TPS/IDLE LEARN PROCEDURE.
TPS / IDLE LEARN PROCEDURE
1. Warm engine until operating temperature is reached.
2. Enter diagnostics. Turn ignition "OFF". Allow 20 seconds for the ISC motor to retract and perform its TPS learn. Repeat this step.
3. With brake applied and the Climate Control in the "OFF" position, place the transmission in the "DRIVE" position and allow the engine to idle for at least one minute
4. Make sure the outside air temperature reading is at least 50°F. While still in "DRIVE", with brakes applied and at idle, place Climate Control in the "AUTO" position and verify A/C clutch engagement. Allow engine to idle at least one minute.
5. Place transmission in "PARK" and turn engine "OFF".