Circuit Description
The Dash Integration Module (DIM) monitors the A/C low side refrigerant temperature via 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 greater 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
The numbers below refer to the step numbers on the diagnostic table.
-
Tests for the proper operation of the circuit in the high voltage range.
-
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.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate the Evaporator Temp. parameter is within the specified range? | -37°C to +127°C (-34°F to +261°F) | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
Does the scan tool indicate the Evaporator Temp. parameter is less than the specified value? | -37°C (-34°F) | Go to Step 4 | Go to Step 5 | |
Does the scan tool indicate the Evaporator Temp. parameter is greater than the specified value? | 127°C (261°F) | Go to Step 8 | Go to Step 6 | |
5 | Test the A/C refrigerant low temperature sensor signal circuit of the A/C low temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
6 | Test the A/C refrigerant low temperature sensor signal circuit of the A/C low temperature sensor for a short to voltage, a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 7 |
7 | Test the low reference circuit of the A/C low temperature sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the A/C low temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the dash integration module (DIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
10 | Replace the A/C low temperature sensor. Refer to Air Conditioning (A/C) Refrigerant Low Temperature Sensor Replacement in Heating, Ventilation and Air Conditioning. Did you complete the replacement? | -- | Go to Step 12 | -- |
11 |
Important: : Perform the BCM Programming/RPO Configuration procedure in Body Control System for the replacement dash integration module (DIM). Replace the dash integration module. Refer to Dash Integration Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
