Inspection (Millenia & 626 2.5L)
- Turn ignition off. Ensure throttle valve is in closed position. Disconnect TP sensor connector. Check for continuity between terminals "C" and "D" of TP sensor connector. (Scheme 1)or (Scheme 2). Continuity should exist. If continuity exists, go to next step. If continuity does not exist, adjust TP sensor.
- Insert a feeler gauge of specified thickness between throttle lever and throttle stop screw. See «TP SENSOR CONTINUITY (MILLENIA & 626 2.5L)»(ref-91091-S05851623732001030200000) table. Connect ohmmeter between terminals "C" and "D" of TP sensor connector. (Scheme 1)or (Scheme 2). If continuity is not as specified, adjust TP sensor.
- Turn ignition off. Ensure throttle valve is in closed position. Disconnect TP sensor connector. Connect ohmmeter between terminals "C" and "D" of TP sensor connector. (Scheme 1)or (Scheme 2). Insert a feeler gauge of specified thickness between throttle lever and throttle stop screw. See «TP SENSOR CONTINUITY (MILLENIA & 626 2.5L)»(ref-91091-S05851623732001030200000) table.
- Loosen TP sensor screws. Rotate TP sensor until ohmmeter indicates continuity as specified. See «TP SENSOR CONTINUITY (MILLENIA & 626 2.5L)»(ref-91091-S05851623732001030200000) table. Tighten TP sensor screws. Open throttle valve fully a few times. Recheck TP sensor adjustment. If TP sensor is not adjusted as specified, replace TP sensor.
Scheme 1
Scheme 2
| Test Condition (1) | Continuity Between Terminals "C" & "D" |
|---|
| Millenia |
| 2.3L |
| .008" (.19 mm) | Yes |
| .015" (.37 mm) | No |
| 2.5L |
| .006" (.15 mm) | Yes |
| .020" (.50 mm) | No |
| 626 |
| 2.5L |
| .006" (.15 mm) | Yes |
| .020" (.50 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. |
TP SENSOR CONTINUITY (MILLENIA & 626 2.5L)
Inspection (Protege & 626 2.0L)
Disconnect TP sensor connector. Using an ohmmeter, measure resistance between terminals "A" and "C" of TP sensor terminals. (Scheme 3) Resistance should measure 2500-6000 ohms (Protege 1.6L) and 4000-6000 ohms (all others). If resistance is not as specified, replace TP sensor.
Scheme 3
Scheme 3: Inspection (Protege & 626 2.0L)
Inspection (B2500, B3000 & B4000)
- Connect New Generation Star (49 T088 0A0) scan tool to data link connector 2 located under left side of instrument panel, right of steering column. see scheme 9 Turn ignition on. Using scan tool, select PID/DATA MONITOR AND RECORD. Select TPS to monitor.
- Manually rotate throttle linkage and check voltage readings. See «THROTTLE POSITION (TP) SENSOR VOLTAGE (B2500, B3000 & B4000)»(ref-91091-S08590385142001030200000) table. If voltage readings are not as specified, replace TP sensor. TP sensor is not adjustable.
| Throttle Valve Position (Degrees) (1) | (2) PID Voltage |
|---|
| 0 | .65 |
| 10 | .97 |
| 20 | 1.44 |
| 30 | 1.90 |
| 40 | 2.37 |
| 50 | 2.84 |
| 60 | 3.31 |
| 70 | 3.78 |
| 80 | 4.24 |
| (1) TP sensor is not adjustable. (2) Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to data link connector 2 located under left side of instrument panel, right of steering column. |
| (1) | TP sensor is not adjustable. |
| (2) | Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to data link connector 2 located under left side of instrument panel, right of steering column. |
THROTTLE POSITION (TP) SENSOR VOLTAGE (B2500, B3000 & B4000)
Inspection Using DVOM (Miata, Millenia, Protege & 626)
Ensure TP sensor is adjusted properly. See ADJUSTMENT under THROTTLE POSITION (TP) SENSOR CONTINUITY . Turn ignition on. Using DVOM, measure voltage between ground and specified terminal at ECM/PCM. See TP SENSOR VOLTAGE (MIATA, MILLENIA, PROTEGE & 626) table. See ECM/PCM LOCATIONS table. If voltage is not as specified, replace TP sensor.
| ECM/PCM Wire Color (1) | Closed Throttle Volts | Wide Open Throttle Volts |
|---|
| Miata |
| Green/Black (3E) | .1-1.1 | 3.0-4.6 |
| Millenia |
| 2.3L |
| Yellow (3B) | .1-1.1 | 2.8-4.5 |
| 2.5L |
| Yellow/Red (3B) | .1-1.0 | 2.8-4.5 |
| Protege |
| 1.6L |
| Blue/Yellow (3D) | .1-1.1 | 3.0-4.6 |
| 1.8L |
| Blue/Yellow (3F) | .1-1.1 | 3.0-4.6 |
| 626 |
| 2.0L |
| Violet/Yellow (89) | .3-0.7 | 3.4-5.3 |
| 2.5L |
| Violet/Yellow (89) | .3-1.0 | 2.8-4.5 |
| (1) Measure voltage between ground and ECM/PCM terminal No. in parentheses. |
| (1) | Measure voltage between ground and ECM/PCM terminal No. in parentheses. |
TP SENSOR VOLTAGE (MIATA, MILLENIA, PROTEGE & 626)
| Application | Location |
|---|
| B2500, B3000 & B4000 | Passenger Side Of Cowl Area |
| Miata | Below Center Of Instrument Panel |
| Millenia | Below Center Of Instrument Panel |
| 626 | Below Front Of Center Console |
| Protege | Below Center Of Instrument Panel |
