Throttle Position Sensor: Adjustments

CLOSED THROTTLE POSITION SWITCH AND THROTTLE POSITION SENSOR ADJUSTMENT




Required Special Tools:
MB991502: Scan Tool (MUT-II)
MB991348: Test Harness Set






CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector. When not using the scan tool MB991502, proceed as follows.
1. Disconnect the throttle position sensor connector.




2. Connect the ohmmeter between terminals 2 (closed throttle position switch) and 1 (sensor ground) by using jumper wire.




2. Insert a feeler gauge as follows:

Insert a feeler gauge with a thickness of 0.65 mm (0.026 inch) between the fixed SAS and the throttle lever.

3.
Insert a feeler gauge with a thickness of 1.4 mm (0.055 inch) between the levers shown in the figure.

NOTE: Do not insert the feeler gauge 3 mm (0.118 inch) or more. If doing that, the throttle lever opening angle becomes larger than the predetermined angle, causing maladjustment.

4. When using the scan tool MB991502, turn the ignition switch to the "ON" position. (Do not start engine.) Observe operation of the closed throttle position switch.

5. Loosen the throttle position sensor mounting bolts. Turn the throttle position sensor body fully clockwise.
6. In this condition, make sure that the closed throttle position switch is "ON".
7. Slowly turn the throttle position sensor counterclockwise until the closed throttle position switch is turns "OFF". Tighten the throttle position sensor mounting bolt at that position. When using the scan tool MB991502, proceed to Step 8.

8. When not using the scan tool MB991502, proceed as follows.
1. Connect special tool MB991348 between the throttle position sensor connectors which have been disconnected. (Connect all terminals taking care not to mistake the terminal number.)
2. Connect a digital voltmeter between the throttle position sensor terminals 3 (sensor output) and 1 (sensor ground).
3. Turn the ignition switch to the "ON" position. (Do not start the engine.)

9. Check the throttle position sensor output voltage.

Standard value: 400 - 1000 mV

10. If there is a deviation from the standard value, check the throttle position sensor and the related harness.
11. Remove the feeler gauge.
Confirm the closed throttle position switch changed from "OFF" to "ON".
12. Turn the ignition switch to the "LOCK" (OFF) position.
13. Disconnect scan tool MB991502.
When the scan tool MB991502 is not used, remove special tool MB991348, and connect the throttle position sensor connector.

NOTE: If a diagnostic trouble code is sent while adjusting the throttle position sensor, use scan tool MB991502 to erase the diagnostic trouble code.