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.
AIRFLOW SENSOR VOLTAGES
| Terminal |
Ignition On Volts |
Engine Running Volts |
| "A" (Power Supply) |
12.0 |
12.0 |
| "B" (Airflow Signal |
0.5-1.0 |
1.0-2.0 |
| "D" (Ground) |
0 |
0 |
| "E" (Ground) |
0 |
0 |
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 |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Temperature |
Ohms |
| 32°F (0°C) |
5000-6000 |
| 68°F (20°C) |
2100-2700 |
| 104°F (40°C) |
1000-1500 |
| 176°F (80°C) |
300-380 |
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 |
Wide Open Throttle Volts |
| Red/Black (2M) |
0.1-1.0 |
3.1-4.5 |