2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1411
Circuit/System Verification
Engine running, observe the scan tool Engine Oil Pressure Sensor parameter. The reading should be between 0.3-4.8 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B37B Engine Oil Pressure Sensor.
2. Ignition OFF, test for less than 10 ohm between the low reference circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
Engine Control Module.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground.
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the K20 Engine Control Module.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine
Control Module.
4. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 V.
瀚慖f less than the specified range, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K20 Engine
Control Module.
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 1. Verify the scan tool Engine Oil
Pressure Sensor parameter is less than 0.3 V.
瀚慖f 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 K20 Engine Control Module.
6. If all circuits test normal, replace the B37B Engine Oil Pressure Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Oil Pressure Sensor and/or Switch Replacement (LF1) (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure
Sensor/Service and Repair)Engine Oil Pressure Sensor and/or Switch Replacement (LAU) (See: Engine, Cooling and
Exhaust/Engine/Engine Lubrication/Oil Pressure Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming.
P0530
DTC B393B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B393B 04
- Air Conditioning Compressor Valve Control Circuit Open
DTC B393B 0B
- Air Conditioning Compressor Valve Control Circuit High Current
Circuit/System Description
The HVAC control module supplies battery voltage to the A/C compressor. When the A/C switch is pressed, the HVAC control module provides a
pulse width modulation (PWM) signal to the A/C compressor in order to command the performance of the A/C compressor. The performance of the
A/C compressor is regulated according to adjusted interior temperature on the basis of characteristic lines. Therefore the HVAC control module
grounds the A/C compressor with the PWM signal.
