Engine Controls - Sensor Operating Range Charts: Introduction
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.
NOTE:
Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature |
Ohms |
| -4°F (-20°C) |
14,600-17,800 |
| 68°F (20°C) |
2200-2700 |
| 104°F (40°C) |
1000-1300 |
| 140°F (60°C) |
500-650 |
| 176°F (80°C) |
290-350 |
EGR POSITION SENSOR RESISTANCE
| Terminals |
Ohms With No Vacuum Applied |
Ohms @ 5.9 In. Hg |
| "A" & "B" |
2700 |
2700 |
| "A" & "C" |
500 |
2700 |
| "B" & "C" |
2400 |
100 |
FUEL TEMPERATURE SENSOR RESISTANCE
| Temperature |
Ohms |
| 68°F (20°C) |
2200-2700 |
| 176°F (80°C) |
290-350 |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Application |
Ohms |
| RX7 |
| 68°F (20°C) |
2200-2700 |
| 176°F (80°C) |
290-350 |
MANIFOLD ABSOLUTE PRESSURE SENSOR
| Application |
Volts |
| Engine At Idle |
1.3-1.6 |
| MAP Sensor Hose Disconnect & Plugged |
2.38-2.78 |
| 29 in. Hg Vacuum Applied To Map Sensor |
4.35-4.65 |
OXYGEN SENSOR
| Operating Condition |
Volts |
| Rapidly Accelerating |
0.5-1.0 |
| Deceleration |
0.0-0.4 |
THROTTLE POSITION SENSOR VOLTAGE
| Wire Color To Ground |
Closed Throttle Volts |
WOT Volts |
| RX7s |
| Green/Red (3F) |
.75-1.25 |
4.8-5.0 |
| Black/Green (3G) |
0.1-0.7 |
4.2-4.6 |