Test B: DTC B1251 Or DTC B1253 - In-Vehicle Temperature Sensor Open Circuit Or Short To Ground
PINPOINT TEST B: DTC B1251 OR DTC B1253 - IN-VEHICLE TEMPERATURE SENSOR OPEN CIRCUIT OR SHORT TO GROUNDNormal Operation
Under normal operation, the in-vehicle air temperature sensor receives a ground from the electronic automatic temperature control (EATC) module through circuit 3059 (YE/LG). A 5-volt reference voltage is supplied to the in-vehicle air temperature sensor from the EATC module through circuit 3060 (GY/RD).
- DTC B1251 In-Vehicle Temperature Sensor Open Circuit - The module senses no voltage drop on the sensor reference voltage circuit, indicating an open circuit.
- DTC B1253 In-Vehicle Temperature Sensor Circuit Short to Ground - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- In-vehicle air temperature sensor
- EATC module
B1-B3:
B3-B5:
