Inspection
- Disconnect TP sensor connector. Connect ohmmeter between TP sensor connector terminals "E" and IDL. (Scheme 4) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. See TP SENSOR CONTINUITY (MIATA A/T, MX-3 1.6L A/T & 1.8L, PROTEGE A/T, 323 A/T, MX-6 2.5L & 626 2.5L) table.
- If continuity is not as specified, adjust TP sensor. See ADJUSTMENT procedure. If continuity is as specified, connect ohmmeter between TP sensor connector terminals Vt and "E". If resistance is less than 1000 ohms with throttle fully closed and about 5000 ohms with throttle wide open, TP sensor is adjusted. If resistance is not as specified, adjust TP sensor. See ADJUSTMENT procedure.
Note. If ohmmeter reading indicates a rough transition anywhere in range between lowest and highest readings, TP sensor potentiometer is faulty. Replace TP sensor.
- Disconnect TP sensor connector. Connect ohmmeter between TP sensor connector terminals "E" and IDL. (Scheme 4) Loosen TP sensor attaching screws.
- Insert a.006" (.15 mm) feeler gauge (MX-3 1.8L, MX-6 2.5L and 626 2.5L) or.010" (.25 mm) feeler gauge (all other models) between throttle lever and throttle stop screw. Rotate TP sensor clockwise about 30 degrees, then rotate counterclockwise until ohmmeter indicates continuity.
- Remove feeler gauge. Insert a.020" (.50 mm) feeler gauge (MX-3 1.8L, MX-6 2.5L and 626 2.5L) or.016" (.40 mm) feeler gauge (all other models) between throttle lever and throttle stop screw. If ohmmeter indicates no continuity, go to next step. If ohmmeter indicates continuity, repeat adjustment procedure.
- Tighten TP sensor attaching screws. Open throttle valve fully and verify resistance between terminals "E" and Vt is about 5000 ohms.
Note. TP sensor on MX-6 2.0L and 626 2.0L is not adjustable.
Scheme 4
| Test Condition (1) | (2) Continuity |
|---|
| MX-3 1.8L, MX-6 2.5L & 626 2.5L |
| .006" (.15 mm) | Yes |
| .020" (.50 mm) | No |
| All Others |
| .004" (.10 mm) | Yes |
| .024" (.60 mm) | No |
| (1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. (2) Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL. |
| (1) | Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
| (2) | Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL. |
TP SENSOR CONTINUITY (MIATA A/T, MX-3 - 1.6L A/T & 1.8L, PROTEGE A/T, 323 A/T, MX-6 2.5L & 626 2.5L)
- Disconnect TP sensor connector. Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. See TP SENSOR CONTINUITY (MIATA, MX-3 1.6L, PROTEGE & 323 - M/T) table.
- Connect ohmmeter between specified terminals of TP sensor connector. (Scheme 5) If continuity is not as specified, adjust TP sensor. See ADJUSTMENT procedure.
- Disconnect TP sensor connector. Connect ohmmeter between terminals IDL and TL/E of TP sensor connector. (Scheme 5) Insert a.016" (.41 mm) feeler gauge between throttle lever and throttle stop screw.
- Loosen TP sensor screws. Rotate TP sensor clockwise about 30 degrees, then rotate counterclockwise until ohmmeter indicates continuity.
- Remove feeler gauge. Insert a.027" (.69 mm) feeler gauge between throttle lever and throttle stop screw. If ohmmeter indicates no continuity, go to next step. If ohmmeter indicates continuity, repeat adjustment procedure.
- Tighten TP sensor attaching screws. Open throttle valve fully a few times. Recheck TP sensor adjustment.
Scheme 5
| Condition | Continuity Between IDL & TL/E | Continuity Between POW & TL/E |
|---|
| Miata |
| .016" (.41 mm) (1) | Yes | No |
| .027" (.7 mm) (1) | No | No |
| WOT | No | Yes |
| MX-3 1.6L, Protege & 323 |
| .004" (.10 mm) (1) | Yes | No |
| .039" (1.0 mm) (1) | No | No |
| WOT | No | Yes |
| (1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
| (1) | Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
TP SENSOR CONTINUITY (MIATA, MX-3 1.6L, PROTEGE & 323 - M/T)
Disconnect TP sensor connector. Using an ohmmeter, measure resistance between specified terminals of TP sensor connector. See TP SENSOR RESISTANCE (MPV 3.0L & 929) table. (Scheme 6)or (Scheme 7). If resistance is not as specified, adjust TP sensor. See ADJUSTMENT procedure.
- Insert a feeler gauge of specified thickness between throttle lever and throttle stop screw. See TP SENSOR ADJUSTMENT (MPV 3.0L & 929) table. Check continuity between TP sensor connector terminals "C" and "D". (Scheme 6)or (Scheme 7).
- If continuity is not as specified, loosen TP sensor mounting screws. Rotate TP sensor until continuity is as specified. Tighten mounting screws. Connect TP sensor connector.
| Application | Ohms |
|---|
| MPV 3.0L |
| Between Terminals "A" & "D" | 3000-6000 |
| Between Terminals "B" & "D" |
| Closed Throttle | About 1000 Or Less |
| Wide Open Throttle | 3000-6000 |
| 929 |
| Between Terminals "A" & "D" | 3000-6000 |
| Between Terminals "B" & "D" |
| Closed Throttle | 200-600 |
| Wide Open Throttle | 3300-7000 |
TP SENSOR RESISTANCE (MPV 3.0L & 929)
| Condition (1) | Continuity Between Terminals "C" & "D" |
|---|
| MPV 3.0L |
| .020" (.5 mm) | Yes |
| .028" (.7 mm) | No |
| 929 |
| .004" (.1 mm) | Yes |
| .008" (.2 mm) | No |
| (1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
| (1) | Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
Scheme 6
Scheme 7
