B1310

CIRCUIT DESCRIPTION
The Outside Air Temperature (OAT) sensor is a thermistor that controls signal voltage to the Air Conditioning Programmer (ACM). The ACM applies voltage on CKT 735. When the sensor is cold the resistance is high, and the ACM will see a high signal voltage at pin "C8." When the sensor warms, resistance is reduced and the signal voltage is pulled low through CKT 407. Signal voltage varies from 5V (open circuit) and 0V (short circuit).

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

FAILURE CONDITION(S)
If Outside temperature drops below approximately -38°C, this DTC should be ignored.

ACTION TAKEN
1. Display "___" on Instrument Panel Cluster (IPC) or Climate Control Panel (CCP) (with analog IPC) temperature display.
2. A default value of 15°C (60°F) will be used to allow operation of the A/C system.

TEST DESCRIPTION
1. Scan Tool displays outside temperature. Jumpering the harness connector will determine whether the wiring or sensor is the cause.

NOTES ON INTERMITTENTS
If an intermittent DTC 131310 is being set, connect scan tool, and 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.