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. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance unless otherwise instructed in test procedure.
SENSOR RANGE CHARTS
| Temperature °F (°C) | Ohms |
|---|---|
| 4 (-20) | 15,000 |
| 32 (0) | 5800 |
| 68 (20) | 2500 |
| 176 (80) | 330 |
| 212 (100) | 160 |
AIR TEMPERATURE SENSOR RESISTANCE
| Application | Ohms | |
|---|---|---|
| 240, 740 & 940 | ||
| 14°F (-10°C) | 8260-10,560 | |
| 68°F (20°C) | 2280-2720 | |
| 176°F (80°C) | 290-364 | |
| 960 | ||
| 32°F (0°C) | 7300 | |
| 68°F (20°C) | 2800 | |
| 176°F (80°C) | 300 | |
COOLANT TEMPERATURE SENSOR RESISTANCE
| Application | Ohms |
|---|---|
| 240, 740 & 940 | 5.5-6.5 |
| (1) Unit contains four resistors: one per injector. Check resistance between center terminal and 4 other terminals. | |
| (1) | Unit contains four resistors: one per injector. Check resistance between center terminal and 4 other terminals. |
FUEL INJECTOR BALLAST RESISTOR RESISTANCE (1)
| Application | Ohms |
|---|---|
| 4-Cylinder | 8 |
| 6-Cylinder | 25 |
AIR CONTROL VALVE (IDLE VALVE) RESISTANCE
| Terminals | Ohms |
|---|---|
| 2 & 3 (1) | 2.5-4.0 |
| (1) Resistance is measured between these terminals. | |
| (1) | Resistance is measured between these terminals. |
MASS AIRFLOW SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 68 (20) | 2-3 |
| 660 (350) | 7-14 |
OXYGEN SENSOR HEATER RESISTANCE