Pinpoint Tests DA: Intake Air Temperature (IAT) Sensor: Introduction
WARNING:
To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
This pinpoint test is intended to diagnose the following:
- integrated mass airflow (MAF)/intake air temperature (IAT) sensor (12B579)
- harness circuits: IAT and SIGRTN
- PCM (12A650)
Voltage values calculated for VPWR equals 5 volts. These values can vary by 15% due to sensor and VPWR variations.
Harness Side
| Circuit | Pin |
|---|---|
| VPWR (Vehicle Power) | 3 |
| IAT (Intake Air Temperature) | 2 |
| SIGRTN (Signal Return) | 4 |
Harness Side
| Circuit | Pin |
|---|---|
| IAT (Intake Air Temperature) | E17 |
| SIGRTN (Signal Return) | E6 |