Tests DA: Intake Air Temp. (IAT)/Engine Coolant Temp. (ECT) Sensors

NOTE
This Pinpoint Test is intended to diagnose the following:
- Intake Air Temperature (IAT) sensor
- Integrated intake air temperature (IAT) sensor
- Engine Coolant Temperature (ECT) sensor
- Engine Oil Temperature (EOT) sensor
- Harness circuits: AT, ECT, EOT and SIG RTN
- Powertrain Control Module (PCM)

The term "applicable" is used in this pinpoint test and refers to the temperature sensor indicated by the Diagnostic Trouble Code (DTC). Example: ECTV, IATV, EOTV.

Tables and Graphs

Voltage And Resistance Graph:

Voltage And Resistance Specifications:

Ambient temperature must be above 10°C (5O°F) to receive acceptable input from the Intake Air Temperature (IAT) sensor.

Engine oil temperature must be greater than 10°C (50°F) to pass the KOEO Self-Test and greater than 66°C (15O°F) to pass the KOER Self-Test.

Voltage values were calculated for VREF 5.0 volts. These values can vary 15 percent due to sensor and VREF variations.

NOTE: Engine coolant temperature must be greater than 10°C (5O°F) to pass the KOEO Self-Test and greater than 82°C (180°F) to pass the KOER Self-Test. To accomplish this, the engine must be at normal operating temperature.

Pinpoint Test Schematics and Connectors