P1531

DTC P1531

CIRCUIT DESCRIPTION
The Dash Integration Module (DIM) monitors the A/C low side refrigerant temperature through the A/C refrigerant low temperature sensor. When the refrigerant is cold, the sensor resistance and signal voltage are high. When the refrigerant is warm, the sensor resistance and signal voltage are low. The DIM will not request A/C compressor clutch engagement when the refrigerant temperature is low enough to cause the A/C evaporator core to freeze.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The DIM detects the A/C refrigerant low temperature sensor signal circuit is less than 0.09 V (5 counts) or more than 4.90 V (250 counts).

ACTION TAKEN WHEN THE DTC SETS
The DIM will substitute a default value of 6°C (43°F) to allow operation of the A/C system.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the DIM no longer detects a failure.
- The history DTC will clear after 40 fault free ignition cycles.
- The DTC can be cleared with a scan tool.

TEST DESCRIPTION

Steps 1 - 2:

Steps 3 - 5:

Steps 6 - 10:

Steps 11 - 12:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper wire opens when you perform this test, the signal circuit is shorted to voltage.