Pinpoint Tests FB: Ambient Air Temperature (AAT): 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:
AMBIENT AIR TEMPERATURE (AAT) SENSOR EXPECTED VALUES
| Temperature | AAT Sensor Values | |
|---|---|---|
| °C | °F | Resistance (K ohms) |
| -1.1 to 4.4 | 30 to 40 | 27.49 to 33.47 |
| 4.4 to 10 | 40 to 50 | 22.06 to 28.86 |
| 10 to 15.6 | 50 to 60 | 16.63 to 23.10 |
| 15.6 to 21.1 | 60 to 70 | 11.74 to 17.32 |
| 21.1 to 26.7 | 70 to 80 | 9.34 to 12.14 |
| 26.7 to 32.2 | 80 to 90 | 8.49 to 9.62 |
| 32.2 to 37.8 | 90 to 100 | 5.93 to 7.87 |
| 37.8 to 43.3 | 100 to 110 | 4.78 to 6.11 |
Harness Side
| Circuit | Pin |
|---|---|
| AAT (Ambient Air Temperature) | 1 |
| SIGRTN (Signal Return) | 2 |
Harness Side
| Circuit | Pin |
|---|---|
| AAT (Ambient Air Temperature) | B33 |
| SIGRTN (Signal Return) | B45 |