H1 CHECK THE AIR CONDITIONING (A/C) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATIONS (PIDS) |
- Using a scan tool, view PCM Parameter Identifications (PIDs).
- With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM Parameter Identification (PID) ACP_PRESS.
Are the pressure values of the manifold gauge set and the Parameter Identifications (PIDs) similar?
|
H2 COMPARE THE EVAPORATOR TEMPERATURE SENSOR TO THE POWERTRAIN CONTROL MODULE (PCM) AMBIENT AIR TEMPERATURE (AAT) PARAMETER IDENTIFICATION (PID) |
- Allow the vehicle exterior and interior to stabilize to ambient temperature.
- Disconnect Evaporator Temperature Sensor.
- Measure:
Positive Lead | Measurement / Action | Negative Lead |
---|
C296-1 |
| C296-3 |
- Compare the resistance values to the table below:
Ambient Temperature °F ( °C) | Resistance | -39.9 °F ( -40 °C) | 832,519 — 1,017,523 ohms | -4.0 °F ( -20 °C) | 263,111 — 290,807 ohms | 32.0 °F ( °C) | 91,058 — 100,644 ohms | 68.0 °F ( 20 °C) | 35,473 — 39,207 ohms | 77.0 °F ( 25 °C) | 28,500 — 31,500 ohms | 103.9 °F ( 40 °C) | 15,307 — 16,919 ohms | 139.9 °F ( 60 °C) | 7,171 — 7,925 ohms | 175.9 °F ( 80 °C) | 3,630 — 4,042 ohms |
- Ignition ON .
- Using a scan tool, view PCM Parameter Identifications (PIDs).
- Monitor the PCM Parameter Identification (PID) AAT.
Are the temperature values similar?
No | INSTALL a new evaporator temperature sensor.
REFER to: Evaporator Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation). |
|
H3 CHECK THE AIR CONDITIONING (A/C) SWITCH (CC_SW_AC) HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE PID WITH THE AIR CONDITIONING (A/C) ON |
- Using a scan tool, view Heating, Ventilation, and Air Conditioning (HVAC) control Module Parameter Identifications (PIDs).
- Monitor the Heating, Ventilation, and Air Conditioning (HVAC) control Module Parameter Identification (PID) CC_SW_AC.
Does the Parameter Identification (PID) read ON?
|
H4 CHECK THE AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) POWERTRAIN CONTROL MODULE (PCM) PID WITH THE AIR CONDITIONING (A/C) ON |
- Using a scan tool, view PCM Parameter Identifications (PIDs).
- Monitor the PCM Parameter Identification (PID) ACC_CMD.
Does the Parameter Identification (PID) read ON?
|
H5 CHECK FOR CORRECT AIR CONDITIONING CONTROL MODULE (ACCM) OPERATION |
- Ignition OFF.
- Disconnect and inspect the Air Conditioning Control Module (ACCM) connectors.
- Repair:
- corrosion (replace connector or terminals – clean module pins)
- damaged or bent pins – replace terminals/pins
- pushed-out pins – replace pins as necessary
- Reconnect the Air Conditioning Control Module (ACCM) connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes | CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, discontinue this test and follow Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Air Conditioning (A/C) Electric Compressor.
REFER to: Air Conditioning (A/C) Electric Compressor (412-00 Climate Control System - General Information, Removal and Installation). |
No | The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. |
|
H6 CHECK FOR CORRECT HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE OPERATION |
- Ignition OFF.
- Disconnect and inspect the Heating, Ventilation, and Air Conditioning (HVAC) control module connectors.
- Repair:
- corrosion (replace connector or terminals – clean module pins)
- damaged or bent pins – replace terminals/pins
- pushed-out pins – replace pins as necessary
- Reconnect the Heating, Ventilation, and Air Conditioning (HVAC) control module connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
|