INTRODUCTION
Note. California and Federal applies to installed emission equipment, which may be verified by underhood emission decal. California emissions may be available in other states. References to California models applies to California emission vehicles.
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 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 Volume Airflow (VAF) meter or Mass Airflow (MAF) meter. For terminal identification and testing, see SYSTEM/COMPONENT TESTS article.
| Application & Terminals | Ohms | |
|---|---|---|
| E2-THA | ||
| 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 application and sensor testing, see the SYSTEM/COMPONENT TESTS article.
| Temperature °F (°C) | K/ohms |
|---|---|
| 122 (50) | 64-97 |
| 212 (100) | 11-16 |
| 302 (150) | 2-4 |
EGR GAS TEMPERATURE SENSOR SPECIFICATIONS
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
For engine coolant temperature sensor location, see the SYSTEM/COMPONENT TESTS article. Measure resistance between engine coolant temperature sensor electrical terminals. Ensure resistance is within specification in relation to specified temp. (Scheme 1)
Scheme 1
INTAKE AIR TEMPERATURE SENSOR
For intake air temperature sensor testing, see the SYSTEM/COMPONENT TESTS article. Measure resistance between intake air temperature sensor electrical terminals. Ensure resistance in within specification in relation to specified temp. (Scheme 1)
OXYGEN SENSOR HEATER
Oxygen sensor heater may be used only on various models and oxygen sensor applications. See OXYGEN SENSOR APPLICATION table.
| Application/ Model | Main Oxygen Sensor | Sub-Oxygen Sensor | Sensor Heater |
|---|---|---|---|
| Land Cruiser | (1) X | N/A | (2) X |
| (1) One on exhaust pipe in front of catalytic converter and one on exhaust pipe behind catalytic converter. (2) Heater used on main oxygen sensor. | |||
| (1) | One on exhaust pipe in front of catalytic converter and one on exhaust pipe behind catalytic converter. |
| (2) | Heater used on main oxygen sensor. |
OXYGEN SENSOR APPLICATION
| Application | Ohms @ 68°F (20°C) |
|---|---|
| Land Cruiser | 11-16 |
| (1) Measure resistance between sensor terminals +B and HT. For terminal ID, see the illustration in the SYSTEM/COMPONENT TESTS article. | |
| (1) | Measure resistance between sensor terminals +B and HT. For terminal ID, see the illustration in the SYSTEM/COMPONENT TESTS article. |
OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS (1)
SUB-OXYGEN SENSOR HEATER
Sub-oxygen sensor heater may be used on various models. See OXYGEN SENSOR APPLICATION table. Using ohmmeter, measure resistance between sensor terminals +B and HT. For terminal identification, see the SYSTEM/COMPONENT TESTS article. Replace sub-oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C).
THROTTLE POSITION SENSOR
For terminal identification and testing procedures, see the SYSTEM/COMPONENT TESTS article.
| Clearance: In. (mm) | Terminals | Ohms |
|---|---|---|
| 0 (0) | VTA & E2 | 200-5700 |
| .020 (.51) | IDL & E2 | 2300 Or Less |
| .030 (.76) | IDL & E2 | No Continuity |
| Fully Open | VTA & E2 | 2000-10,200 |
| " | VC & E2 | 2500-5900 |
| (1) Apply vacuum to throttle opener before checking TPS. | ||
| (1) | Apply vacuum to throttle opener before checking TPS. |
4.5L TPS RESISTANCE SPECIFICATIONS (1)
See also:
• SYSTEM/COMPONENT TESTS
• BASIC TESTING
• OXYGEN SENSOR APPLICATION