- Remove A/C ECU (instrument cluster ECU), leaving harness connectors connected. Turn ignition on.
- Measure voltage (backprobe) between A/C ECU connector terminals C14-7 (Black/Red wire) and C14-16 (White/Red wire). (Схема №3)or (Схема №4). See «AMBIENT TEMPERATURE SENSOR CIRCUIT VOLTAGE SPECIFICATIONS»(ref-98896-S14378772842001060500000) table.
- If voltage is as specified, temporarily substitute a known-good A/C ECU, then retest system. If voltage is not as specified, test ambient temperature sensor. See «AMBIENT TEMPERATURE SENSOR»(ref-98896-S21867244762001060500000) under COMPONENT TESTS. Replace sensor as necessary. If sensor is okay, go to next step.
- Inspect wiring harness and connectors between sensor and A/C ECU. See «WIRING DIAGRAMS»(ref-98896-S06345939912001060500000). Repair as necessary. If wiring harness and connectors are okay, temporarily substitute a known-good A/C ECU. Retest system.
| Sensor Temperature - °F (°C) | (1) Volts |
|---|
| 77 (25) | 1.35-1.75 |
| 104 (40) | 0.85-1.25 |
| (1) As temperature increases, voltage should gradually decrease. |
| (1) | As temperature increases, voltage should gradually decrease. |
AMBIENT TEMPERATURE SENSOR CIRCUIT VOLTAGE SPECIFICATIONS
