B1315

CIRCUIT DESCRIPTION
The evaporator inlet temperature sensor is a thermistor that controls signal voltage to the ACM. The ACM applies voltage on CKT 731. When sensor is cold its resistance is high, the ACM will see a high signal voltage at pin "D15." When sensor warms, the resistance becomes less and the signal voltage is pulled low through CKT 407. This signal voltage varies between 5V (open circuit) and 0V (short circuit).

TEST CONDITION(S)
1. Ignition "ON."

ACTION TAKEN
1. A/C compressor clutch not allowed to engage.
2. Instrument Panel Cluster (IPC) displays "SERVICE A/C SYSTEM - A/C COMPRESSOR OFF."
3. A default temperature reading of 6°C (43°F) will be implemented.

TEST DESCRIPTION
1. Scan Tool displays Low Side temperature. Disconnecting the sensor will determine if the wiring or sensor is the cause.
2. Test lamp will not light. Test lamp is used to provide a resistance.

TEST DESCRIPTION
If an intermittent DTC B1315 is being set connect Scan Tool, select ACM Data list, Open/Shorts Data and note reading.

Manipulate the wiring while observing scan tool. If failure is induced, the reading will jump. Check for poor terminal contact, obstructed, or defective sensor.