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 will cause driveability problems.
Note. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.
COOLANT TEMPERATURE SENSOR
| °F (°C) | Ohms |
|---|
| 212 (100) | 177 |
| 158 (70) | 467 |
| 100 (38) | 1800 |
| 68 (20) | 3520 |
| 23 (-5) | 12,300 |
| 0 (-18) | 25,000 |
| 40 (-40) | 100,700 |
| (1) Measure resistance across sensor terminals. |
| (1) | Measure resistance across sensor terminals. |
COOLANT TEMPERATURE SENSOR RESISTANCE VALUES (1)
INTAKE AIR TEMPERATURE (IAT) SENSOR
| °F (°C) | Ohms |
|---|
| 210 (100) | 185 |
| 160 (70) | 450 |
| 100 (38) | 1800 |
| 70 (20) | 3400 |
| 40 (4) | 7500 |
| 20 (-7) | 13,500 |
| 0 (-18) | 25,000 |
| 40 (-40) | 100,700 |
| (1) Measure resistance across sensor terminals. |
| (1) | Measure resistance across sensor terminals. |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE VALUES (1)
MAP SENSOR
| Altitude (Ft.) | Volts |
|---|
| Below 1000 | 3.8-5.5 |
| 1000-2000 | 3.6-5.3 |
| 2000-3000 | 3.5-5.1 |
| 3000-4000 | 3.3-5.0 |
| 4000-5000 | 3.2-4.8 |
| 5000-6000 | 3.0-4.6 |
| 6000-7000 | 2.9-4.5 |
| 7000-8000 | 2.8-4.3 |
| 8000-9000 | 2.6-4.2 |
| 9000-10,000 | 2.5-4.0 |
| (1) Measured at sensor, or as seen on scan tester. |
| (1) | Measured at sensor, or as seen on scan tester. |
MAP SENSOR VOLTAGE RANGE (1)
OXYGEN SENSOR
| Condition | Volts |
|---|
| Lean | .1 |
| Rich | .9 |
| (1) Measure voltage between oxygen sensor ground and signal terminals at ECM. |
| (1) | Measure voltage between oxygen sensor ground and signal terminals at ECM. |
OXYGEN SENSOR VOLTAGE TEST (1)
