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 testing procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
AIRFLOW METER
Airflow meter may be referred to as Mass Airflow (MAF) meter. For terminal identification and testing, see SYSTEM/COMPONENT TESTS article.
| Temperature | Ohms |
|---|---|
| 4°F (20°C) | 10,000-20,000 |
| 32°F (0°C) | 4000-7000 |
| 68°F (20°C) | 2000-3000 |
| 104°F (40°C) | 900-1300 |
| 140°F (60°C) | 400-700 |
| 176°F (80°C) | 200-400 |
AIRFLOW METER RESISTANCE SPECIFICATIONS
CRANKSHAFT POSITION SENSOR
For crankshaft position sensor testing, see BASIC TESTING article.
| Application | Ohms |
|---|---|
| Cold (1) | 1630-2740 |
| Hot (2) | 2065-3225 |
| (1) Cold is with temperature of 14-122°F (-10-50°C). (2) Hot is with temperature of 122-212°F (50-100°C). | |
| (1) | Cold is with temperature of 14-122°F (-10-50°C). |
| (2) | Hot is with temperature of 122-212°F (50-100°C). |
CRANKSHAFT POSITION SENSOR RESISTANCE
EGR GAS TEMPERATURE SENSOR
For EGR gas temperature sensor testing, see information in SYSTEM/COMPONENT TESTS article.
| Temperature °F (°C) | Ohms |
|---|---|
| 122 (50) | 64,000-97,000 |
| 212 (100) | 11,000-16,000 |
| 302 (150) | 2000-4000 |
EGR GAS TEMPERATURE SENSOR SPECIFICATIONS
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
For engine coolant temperature sensor location, see information in SYSTEM/COMPONENT TESTS article. Using ohmmeter, check resistance between electrical terminals on engine coolant temperature sensor. Ensure resistance is within specification in relation to specified temperature. (Scheme 1)
Scheme 1
HEATED OXYGEN SENSOR
For heated oxygen sensor application and sensor testing, see SYSTEM/COMPONENT TESTS article.
THROTTLE POSITION (TP) SENSOR
For terminal identification and testing procedures, see SYSTEM/COMPONENT TESTS article.
| Application | Clearance: In. (mm) | Terminals | Ohms |
|---|---|---|---|
| 4.5L (1) | 0 (0) | VTA & E2 | 200-5700 |
| " | .020 (.50) | IDL & E2 | 2300 Or Less |
| " | .030 (.75) | IDL & E2 | No Continuity |
| " | Fully Open | VTA & E2 | 2000-10,200 |
| " | " | VC & E2 | 2500-5900 |
| (1) Apply vacuum to throttle opener before checking TP sensor. | |||
| (1) | Apply vacuum to throttle opener before checking TP sensor. |
THROTTLE POSITION SENSOR RESISTANCE SPECIFICATIONS