Posted: Sep 05 2012 at 8:43pm | IP Logged

DTC P0510: CLOSED THROTTLE POSITION (TP) SWITCH

DTC P0120: THROTTLE POSITION (TP) SENSOR

When installing the TPS, it has to be adjusted correctly failing which it would cause the code to show.

1. Check Base Idle Speed

Check idle speed. Base idle speed should be 650-750 RPM with transmission in Park or Neutral. If idle speed is as specified, go to next step. If idle speed is not as specified, adjust by turning idle speed adjusting screw. See Fig. 16 . Go to next step.

2. Check Closed TP Switch Idle Position

Turn ignition off. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect TP switch harness connector. See Fig. 17 . Insert a .012" (.30 mm) feeler gauge between throttle adjusting screw and stopper. See Fig. 18 .

3. Check continuity between TP switch terminals No. 4 and 5. See Fig. 17 . Continuity should exist. Remove .012" (.30 mm) feeler gauge, and insert .016" (.40 mm) feeler gauge. Continuity should not exist. If continuity is as specified, go to step 6. If continuity is not as specified, go to next step.

4. TP Sensor Idle Position Adjustment

Ensure engine is at normal operating temperature. Loosen TP sensor bolts. Remove .016" (.40 mm) feeler gauge, and insert .014" (.35 mm) feeler gauge. Open and close throttle. Continuity should not exist while closing throttle. If continuity exists, turn TP sensor body clockwise until continuity does not exist.

5. Remove .014" (.35 mm) feeler gauge, and insert .012" (.30 mm) feeler gauge. Slowly rotate TP sensor body counterclockwise until continuity exists, then tighten TP sensor bolts. Ensure continuity exists when throttle is closed and does not exist when throttle is open. Repeat 2 or 3 times. Remove .012" (.30 mm) feeler gauge, and insert .016" (.40 mm) feeler gauge. Ensure continuity does not exist when throttle is closed. Repeat 2 or 3 times. Go to next step.

6. Reset TP Sensor Idle Position Memory

Remove feeler gauge. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Turn ignition off. Turn ignition on, wait at least 5 seconds, then turn ignition off and wait at least 5 seconds. Repeat 20 times. Go to next step.

7. Check Target Idle Speed

Check idle speed. Target idle speed should be 700-800 RPM with transmission in Park or Neutral. If idle speed is as specified, go to next step. If idle speed is not as specified, adjust by turning idle speed adjusting screw. See Fig. 16 . Go to next step.

8. Clear DTC Memory

DTCs may be stored in ECM and/or Transmission Control Module (TCM) from performing basic inspection. Clear DTCs from ECM and TCM.