CRANKSHAFT POSITION (CKP) SENSOR
| Application | (1) Ohms |
| B2500, B3000 & B4000 (1) | 300-800 |
| Miata | (2) |
| Millenia 2.3L | 950-1250 |
| Millenia 2.5L & 626 (3) | 520-580 |
| Protege (3) | 500-600 |
| (1) Measure resistance between CKP sensor terminals. Specification is with sensor temperature at 68°F (20°C) (2) Information not available from manufacturer. (3) Measure resistance between sensor terminals "A" and "B". (Scheme 1) Specification is with sensor temperature at 68°F (20°C). |
| (1) | Measure resistance between CKP sensor terminals. Specification is with sensor temperature at 68°F (20°C) |
| (2) | Information not available from manufacturer. |
| (3) | Measure resistance between sensor terminals "A" and "B". (Scheme 1) Specification is with sensor temperature at 68°F (20°C). |
CRANKSHAFT POSITION SENSOR RESISTANCE
Scheme 1
DIFFERENTIAL PRESSURE FEEDBACK EGR (DPFE) SENSOR
| Pressure (psi) | In. Hg | (1) Volts |
| 4.34 | 8.83 | 4.56 |
| 3.25 | 6.62 | 3.54 |
| 2.17 | 4.41 | 2.51 |
| 1.08 | 2.21 | 1.48 |
| 0.0 | 0.0 | 0.5 |
| (1) Voltage specifications are calculated for a VREF equaling 5 volts. Specification may differ by as much as 15 percent. |
| (1) | Voltage specifications are calculated for a VREF equaling 5 volts. Specification may differ by as much as 15 percent. |
DIFFERENTIAL PRESSURE FEEDBACK EGR (DPFE) SENSOR VOLTAGE (B2500, B3000 & B4000)
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
| Temperature °F (°C) | (1) PID Voltage | Ohms |
| 50 (10) | 3.52 | 58,750 |
| 68 (20) | 3.06 | 37,300 |
| 86 (30) | 2.62 | 24,270 |
| 104 (40) | 2.16 | 16,150 |
| 122 (50) | 1.70 | 10,970 |
| 140 (60) | 1.35 | 7600 |
| 158 (70) | 1.04 | 5370 |
| 176 (80) | 0.80 | 3840 |
| 194 (90) | 0.61 | 2800 |
| 212 (100) | 0.47 | 2070 |
| 230 (110) | 0.36 | 1550 |
| 248 (120) | 0.28 | 1180 |
| (1) Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
| (1) | Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR SPECIFICATIONS (B2500, B3000 & B4000)
| Temperature °F (°C) | Ohms |
| Miata & Protege (1) |
| 68 (20) | 2200-2700 |
| 176 (80) | 290-350 |
| Millenia (2) |
| 68 (20) | 2200-2700 |
| 176 (80) | 290-350 |
| 626 (2) |
| 68 (20) | 35,500-39,200 |
| 176 (80) | 7180-7920 |
| (1) Measure resistance between ECT sensor terminals "A" and "B". (Scheme 2)or (Scheme 3). (2) Measure resistance between ECT sensor terminals. |
| (2) | Measure resistance between ECT sensor terminals. |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (EXCEPT B2500, B3000 & B4000)
Scheme 2
Scheme 3
INTAKE AIR TEMPERATURE (IAT) SENSOR
Note. IAT sensor on Protege 1.8L is part of Mass Airflow (MAF) sensor. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article.
| Temperature °F (°C) | (1) PID Voltage | (2) Ohms |
| 50 (10) | 3.52 | 58,750 |
| 68 (20) | 3.06 | 37,300 |
| 86 (30) | 2.62 | 24,270 |
| 104 (40) | 2.16 | 16,150 |
| 122 (50) | 1.70 | 10,970 |
| 140 (60) | 1.35 | 7600 |
| 158 (70) | 1.04 | 5370 |
| 176 (80) | 0.80 | 3840 |
| 194 (90 | 0.61 | 2800 |
| 212 (100 | 0.47 | 2070 |
| 230 (110 | 0.36 | 1550 |
| 248 (120) | 0.28 | 1180 |
| (1) Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. (2) Measure resistance between IAT sensor terminals. |
| (1) | Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
| (2) | Measure resistance between IAT sensor terminals. |
INTAKE AIR TEMPERATURE (IAT) SENSOR SPECIFICATIONS (B2500, B3000 & B4000)
| Temperature °F (°C) | (1) Ohms |
| IAT Sensor (Air Cleaner Housing) |
| 68 (20) | 2200-2700 |
| 176 (80) | 290-350 |
| IAT Sensor (Dynamic Chamber) |
| 77 (25) | 29,700-36,300 |
| 185 (85) | 3330-3670 |
| IAT Sensor (Lysolm Compressor) |
| 212 (100) | 5600-6900 |
| (1) Measure resistance between IAT sensor terminals. |
| (1) | Measure resistance between IAT sensor terminals. |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (MILLENIA 2.3L)
| Temperature °F (°C) | (1) Ohms |
| Miata |
| 68 (20) | 2090-2810 |
| 176 (80) | 274-370 |
| Millenia 2.5L |
| 68 (20) | 2200-2700 |
| 176 (80) | 290-350 |
| Protege 1.6L |
| 50 (10) | 3100-4400 |
| 68 (20) | 2200-2700 |
| 86 (30) | 1400-1900 |
| Protege 1.8L |
| 68 (20) | 2200-2700 |
| 176 (80) | 270-370 |
| 626 |
| 68 (20) | 35,500-39,200 |
| 176 (80) | 7180-7920 |
| (1) Measure resistance between IAT sensor terminals. |
| (1) | Measure resistance between IAT sensor terminals. |
INTAKE AIR TEMPERATURE SENSOR RESISTANCE (MIATA, MILLENIA 2.5L, PROTEGE & 626)
KNOCK SENSOR
| Temperature °F (°C) | (1) Ohms |
| 68 (20) | 560,000 |
| (1) Measure resistance between terminal "A" (White wire on Miata and 626, Red wire on Millenia 2.3L) and knock sensor body. |
| (1) | Measure resistance between terminal "A" (White wire on Miata and 626, Red wire on Millenia 2.3L) and knock sensor body. |
KNOCK SENSOR RESISTANCE (MIATA, MILLENIA & 626)
MASS AIRFLOW (MAF) SENSOR
| Condition | (1) Volts |
| Miata |
| Ignition On | 1.5 |
| Idle | 1.9-2.0 |
| Millenia |
| Ignition On | 1.3-1.5 |
| Idle | 1.5-3.0 |
| Protege |
| 1.6L |
| Ignition On | .9-2.0 |
| Idle | 1.7-2.4 |
| 1.8L |
| Ignition On | .2-1.0 |
| Idle | .2-2.0 |
| 626 |
| 2.0L |
| Ignition On | .02 |
| Idle | .6-1.1 |
| 2.5L |
| Ignition On | Less Than 1 |
| Idle | 1-2 |
| (1) Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
| (1) | Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
MASS AIRFLOW (MAF) SENSOR VOLTAGE (EXCEPT B2500, B3000 & B4000)
THROTTLE POSITION SENSOR
| Throttle Valve Position (Degrees) (1) | (2) PID Voltage |
| Zero | 0.65 |
| 10 | 0.97 |
| 20 | 1.44 |
| 30 | 1.90 |
| 40 | 2.37 |
| 50 | 2.84 |
| 60 | 3.31 |
| 70 | 3.78 |
| 80 | 3.90 |
| (1) TP sensor is not adjustable. (2) Check sensor voltage using New Generation Star (49 T088 0A0) scan tool connected to Data Link Connector (DLC) 2. DLC is 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 (DLC) 2. DLC is located under left side of instrument panel, right of steering column. |
THROTTLE POSITION (TP) SENSOR VOLTAGE (B2500, B3000 & B4000)