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.
SENSOR RANGE CHARTS
Note. Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
| Terminals | Ohms @ Closed Throttle | Ohms @ Slightly Open Throttle |
|---|
| 4 & 6 | 0 | Infinite |
CLOSED THROTTLE POSITION (CTP) SWITCH RESISTANCE
| Terminals No. | Ohms |
|---|
| 1 & 2 | 1000 |
| 1 & 3 | 0 |
| 2 & 3 | 0 |
CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE
| Temperature | Ohms |
|---|
| 68°F (20°C) | About 2500 |
| 176°F (80°C) | About 330 |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Condition | (1) Volts |
|---|
| Lean | About 0.2 |
| Rich | About 0.7 |
| (1) Measured between connector terminal and ground. |
| (1) | Measured between connector terminal and ground. |
HEATED OXYGEN SENSOR (HO2S) VOLTAGE
| Terminals No. | Ohms |
|---|
| 1 & 2 | 25-35 |
INTAKE MANIFOLD CHANGE-OVER (IMCO) VALVE SW RESISTANCE
| Condition | (1) Volts |
|---|
| Key On Engine Off | About 0.3-1.1 |
| Engine Running (2) | About 1.5-3.4 |
| (1) Backprobe connector terminals No. 1 and 2. (2) Vary engine speed between idle and 4000 RPM. |
| (1) | Backprobe connector terminals No. 1 and 2. |
| (2) | Vary engine speed between idle and 4000 RPM. |
MASS AIRFLOW (MAF) SENSOR TEST
| Terminals | Ohms @ Idle | Ohms @ Wide Open Throttle |
|---|
| 1 & 2 | 1500-2600 | N/A |
| 2 & 3 | 750-1300 | 3600 |
THROTTLE POSITION (TP) SENSOR RESISTANCE
