Evaporator Temperature Sensor 7/41
GENERAL
The evaporator temperature sensor sends the current evaporator temperature to the engine control module (ECM) via the climate control module (CCM). The engine control module (ECM) then determines whether the compressor should be started.
Type
Temperature-dependent, NTC resistor (negative temperature coefficient).
characteristic
Resistance between terminals #29 and #38 on the breakout box should be 3.44 kΩ at +20 °C. Resistance decreases as temperature increases.
Other information
Diagnostic trouble code B1B7115 is generated upon short circuit to supply voltage or open circuit.
Diagnostic trouble code B1B7111 is generated upon short circuit to ground.
TERMINAL
| Breakout box connection | Connector terminal | Control module terminal | Signal type | Miscellaneous |
|---|---|---|---|---|
| #29 | #1 | #C1:5 | Evaporator temperature sensor, signal (+) | - |
| #38 | #2 | #C1:14 | Evaporator temperature sensor, signal (-) | - |
CHECK
Prerequisites (unless otherwise specified):
- Breakout box connected.
- Sensor connected.
- Ignition switch position 0.
Check 1
Evaporator temperature sensor:
Measure resistance between terminals #29 and #38 on the breakout box. The value should follow the information below:
R = 3.44 kΩ at 20 °C.
R = 1.47 kΩ at 40 °C.
R = 336 Ω at 80 °C.
R = 187 Ω at 100 °C.