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 diagnostic trouble code, but it may cause driveability problems.
NOTE:
Unless stated otherwise in test procedure, perform all resistance and voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
CLOSED THROTTLE POSITION (CTP) SWITCH RESISTANCE
| Terminals No. |
Ohms Closed Throttle |
Ohms Slightly Open Throttle |
| 4 & 6 |
0 |
Infinite (Open) |
CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE
| Terminals No. |
Ohms |
| 1 & 2 |
Approx. 1000 |
| 1 & 3 |
Infinite (Open) |
| 2 & 3 |
Infinite (Open) |
EGR TEMPERATURE SENSOR RESISTANCE TEST
| Temperature °F (°C) |
Ohms |
| 122 (50) |
500,000-600,000 |
| 257 (125) |
35,000-40,000 |
| 392 (200) |
4500-6500 |
ECT SENSOR RESISTANCE
| Temperature °F (°C) |
Ohms |
| 86 (30) |
1500-2000 |
| 104 (40) |
1000-1500 |
| 122 (50) |
800-1000 |
| 140 (60) |
500-700 |
| 158 (70) |
375-500 |
| 176 (80) |
275-375 |
| 194 (90) |
225-275 |
ENGINE SPEED (RPM) SENSOR RESISTANCE
| Terminals No. |
Ohms |
| 1 & 2 |
Approx. 1 |
| 1 & 3 |
Infinite (Open) |
| 2 & 3 |
Infinite (Open) |
HEATED OXYGEN SENSOR (HO2S) VOLTAGE
| Condition |
Volts |
| Lean |
Approx. 0.2 |
| Rich |
Approx. 0.7 |
INTAKE AIR (IAT) SENSOR RESISTANCE
| Temperature °F (°C) |
Ohms |
| 86 (30) |
1500-2000 |
| 104 (40) |
1000-1500 |
| 122 (50) |
800-1000 |
| 140 (60) |
500-700 |
| 158 (70) |
375-500 |
| 176 (80) |
275-375 |
| 194 (90) |
225-275 |
MASS AIRFLOW (MAF) SENSOR TEST
| Condition |
Volts |
| Key On Engine Off |
About 0.3-1.1 |
| Engine Running |
1.5 Minimum-3.4 Maximum |
THROTTLE POSITION (TP) SENSOR RESISTANCE
| Terminals No. |
Ohms At Idle |
Ohms Wide Open Throttle |
| 1 & 2 |
1500-2600 |
N/A |
| 2 & 3 |
750-1300 |
3600 Maximum |