B1313

CIRCUIT DESCRIPTION
The High Side Temperature sensor is a thermistor that controls signal voltage to the ACM. The ACM applies voltage on CKT 732. When sensor is cold, the resistance is high, and the ACM will see high signal voltage at pin "C5." When the sensor warms, its resistance becomes less and signal voltage is pulled low through CKT 407. Signal voltage will vary between 5V (open circuit) and 0V (short circuit).

TEST CONDITION(S)
1. Ignition "ON." DTC 1310 is not set.

ACTION TAKEN
1. High cooling fans operate when A/C compressor operation is possible.
2. A default value of 79°C (144°F) will be substituted to continue operation of the system.

TEST DESCRIPTION
1. Scan Tool displays High Side Temp. 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.

NOTES ON INTERMITTENTS
In some vehicles, this DTC may set intermittently if sensor temperature falls below 30°F. The DTC will become history after sensor temperature increases.

If an intermittent DTC B1313 is being set, use a 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.