Suzuki XL7 2007 Service Manual page 1847

Circuit/System Testing
1. Ignition OFF, disconnect the evaporator temperature
sensor harness connector at the evaporator
temperature sensor.
2. Ignition OFF, test for less than 1 ohm of resistance
between the low reference circuit terminal B and
ground of the evaporator temperature sensor.
➢ If greater than the specified range, test the low
reference circuit terminal for an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
3. Ignition ON, verify the evaporator air temperature
sensor parameter is greater than 4.55 volts.
➢ If less than the specified range, test the signal
circuit terminal A for a short to ground. If the circuit
tests normal, replace the HVAC control module.
DTC P0532 or P0533
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: "
DTC Descriptor
DTC P0532: Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage
DTC P0533: Air Conditioning A/C Refrigerant Pressure Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit
5 -Volt Reference Circuit
A/C Refrigerant Pressure Sensor Signal
Circuit
Low Reference Circuit
Circuit/System Description
The engine control module (ECM) monitors the high side
refrigerant pressure through the A/C refrigerant pressure
sensor. The ECM supplies a 5-volt reference and a low
reference to the sensor. Changes in the A/C refrigerant
pressure cause the A/C refrigerant pressure sensor
signal to the ECM to vary. When the pressure is low, the
signal voltage is low. When the pressure is high, the
ECM commands the cooling fans on. When pressure is
too high or too low, the ECM will not allow the A/C
compressor clutch to engage.
Conditions for Running the DTC
• The Engine is running.
• The Battery voltage is between 11 — 18 volts.
Heating, Ventilation and Air Conditioning:
4. Install a 3A fused jumper wire between the signal
circuit terminal A and the low reference circuit
terminal B of the sensor. Verify the evaporator air
temperature sensor voltage parameter is less than
0.433 volts.
➢ If greater than the specified range, test the signal
circuit for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the
HVAC control module.
5. If all circuits test normal, test or replace the
evaporator temperature sensor.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Air Conditioning (A/C) Refrigerant Low Temperature
Sensor Replacement: "
• "Control Module References: " for HVAC control
module replacement, setup and programming
Short to Open/High
Ground Resistance
P0532 P0532
P0532 P0533
— P0532
Conditions for Setting the DTC
• The ECM detects that the A/C pressure is less than
1psi (0.01 volts).
• The ECM detects that the A/C pressure is more than
425 psi (4.90 volts).
Action Taken When the DTC Sets
• The ECM will not illuminate the malfunction indicator
lamp (MIL).
• The ECM stores the failure records.
• The A/C compressor clutch is disabled.
Short to Voltage
P0533
P0532
P0533
7A-33