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.
CLOSED THROTTLE POSITION (CTP) SWITCH RESISTANCE
| Terminals |
Ohms @ Closed Throttle |
Ohms @ Slightly Open Throttle |
| 4 & 6 |
0 |
Infinite |
CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE
| Terminals No. |
Ohms |
| 1 & 2 |
1000 |
| 1 & 3 |
0 |
| 2 & 3 |
0 |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature |
Ohms |
| 68°F (20°C) |
About 2500 |
| 176°F (80°C) |
About 330 |
INTAKE MANIFOLD CHANGE-OVER (IMCO) VALVE SWITCH RESISTANCE
| Terminals No. |
Ohms |
| 1 & 2 |
25-35 |
MASS AIRFLOW (MAF) SENSOR TEST
| Condition |
Volts |
| Key On Engine Off |
About 0.3-1.1 |
| Engine Running |
About 1.5-3.4 |
OXYGEN SENSOR (O2S) VOLTAGE
| Condition |
Volts |
| Lean |
About 0.2 |
| Rich |
About 0.7 |
THROTTLE POSITION (TP) SENSOR RESISTANCE
| Terminals |
Ohms @ Idle |
Ohms @ Wide Open Throttle |
| 1 & 2 |
1500-2600 |
N/A |
| 2 & 3 |
750-1300 |
3600 |