Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2004MALIBU V6-3.5L VIN 8REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL TESTING - HVAC SYSTEM - MANUALSCAN TOOL DATA DEFINITIONS
2004 Chevrolet Malibu V6-3.5L VIN 8
Scan Tool Data Definitions
2004 Chevrolet Malibu V6-3.5L VIN 8SECTION Scan Tool Data Definitions
SCAN TOOL DATA DEFINITIONS
A/C Disengage Reason: The scan tool displays one of the following reasons why the PCM has disengaged the a/c compressor; None, System Voltage, WOT, CKP, Learn Active, Engine Run Time, Coolant Hot, Anti Stall, A/C Pressure, Engine Speed, Trans Engine Speed, A/C Pressure Sensor, Low Voltage, High Voltage, Outside Air, Temp, A/C Switched Off.
A/C High Side Pressure Sensor: The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the PCM input from the A/C refrigerant pressure sensor is converted to a pressure value.
A/C High Side Pressure Sensor: The scan tool displays 0-5 volts. The voltage applied to the PCM input for the A/C refrigerant pressure sensor.
A/C Off for WOT: The scan tool displays the high throttle disable of the a/c compressor.
A/C Pressure Disable: The scan tool displays the status of the a/c high side pressure sensor. The scan tool displays Active/Inactive.
A/C Relay Command: The scan tool displays On/Off. The scan tool displays the control decision for the compressor clutch relay output as determined by the PCM.
A/C Relay Circuit History: The scan tool displays the following message stating the history status of the a/c relay control circuit. The scan tool displays OK/Open/Short.
A/C Request Signal: The scan tool displays Yes/No. The scan tool displays Yes when the PCM receives a message to engage the A/C compressor clutch. The scan tool displays No when the PCM receives a message to disengage the A/C compressor clutch.
A/C Request Switch: The scan tool displays On/Off. The a/c request switch shows current status of the a/c request switch function on the BCM.
ECT Sensor: The scan tool displays -40 to +215°C (-40 to +419°F). The voltage applied to the PCM input from the engine coolant temperature sensor is converted to a temperature value.
FC Relay 1 Command: The scan tool displays the command status of the PCM to relay 1. The scan tool displays On/Off.
FC Relay 2 and 3 Command: The scan tool displays the command status of the PCM to relays 2 and 3. The scan tool displays On/Off.
Ignition 1 Signal: The scan tool shows available voltage at the PCM. The scan tool displays 0-12 volts.
Outside Air Temp Sensor: The voltage applied to the BCM input for the outside air temperature sensor. The scan tool displays 0-5 volts.
A/C Disengage Reason: The scan tool displays one of the following reasons why the PCM has disengaged the a/c compressor; None, System Voltage, WOT, CKP, Learn Active, Engine Run Time, Coolant Hot, Anti Stall, A/C Pressure, Engine Speed, Trans Engine Speed, A/C Pressure Sensor, Low Voltage, High Voltage, Outside Air, Temp, A/C Switched Off.
A/C High Side Pressure Sensor: The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the PCM input from the A/C refrigerant pressure sensor is converted to a pressure value.
A/C High Side Pressure Sensor: The scan tool displays 0-5 volts. The voltage applied to the PCM input for the A/C refrigerant pressure sensor.
A/C Off for WOT: The scan tool displays the high throttle disable of the a/c compressor.
A/C Pressure Disable: The scan tool displays the status of the a/c high side pressure sensor. The scan tool displays Active/Inactive.
A/C Relay Command: The scan tool displays On/Off. The scan tool displays the control decision for the compressor clutch relay output as determined by the PCM.
A/C Relay Circuit History: The scan tool displays the following message stating the history status of the a/c relay control circuit. The scan tool displays OK/Open/Short.
A/C Request Signal: The scan tool displays Yes/No. The scan tool displays Yes when the PCM receives a message to engage the A/C compressor clutch. The scan tool displays No when the PCM receives a message to disengage the A/C compressor clutch.
A/C Request Switch: The scan tool displays On/Off. The a/c request switch shows current status of the a/c request switch function on the BCM.
ECT Sensor: The scan tool displays -40 to +215°C (-40 to +419°F). The voltage applied to the PCM input from the engine coolant temperature sensor is converted to a temperature value.
FC Relay 1 Command: The scan tool displays the command status of the PCM to relay 1. The scan tool displays On/Off.
FC Relay 2 and 3 Command: The scan tool displays the command status of the PCM to relays 2 and 3. The scan tool displays On/Off.
Ignition 1 Signal: The scan tool shows available voltage at the PCM. The scan tool displays 0-12 volts.
Outside Air Temp Sensor: The voltage applied to the BCM input for the outside air temperature sensor. The scan tool displays 0-5 volts.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.