2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 993
6. If all circuits/connections test normal, test or replace the B52 Heated Oxygen Sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the B52 Heated Oxygen Sensor.
2. Test for 5-25 ohm between the control terminal 2 and the ignition terminal 1 of the B52 Heated Oxygen Sensor.
瀚慖f not within the specified range, replace the B52 Heated Oxygen Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Sensor 1 (LAU) (See: Powertrain Management/Computers and Control Systems/Oxygen
Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Sensor 1)
* Heated Oxygen Sensor Replacement - Sensor 2 (LAU) (See: Powertrain Management/Computers and Control Systems/Oxygen
Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Sensor 2)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement, setup, and
programming
P0032
DTC P0030, P0031, P0032, P0036, P0037, or P0038 (Without LF1)
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 Descriptors
DTC P0030
- HO2S Heater Control Circuit Sensor 1
DTC P0031
- HO2S Heater Control Circuit Low Voltage Sensor 1
DTC P0032
- HO2S Heater Control Circuit High Voltage Sensor 1
DTC P0036
- Heater Control Circuit Sensor 2
DTC P0037
- HO2S Heater Control Circuit Low Voltage Sensor 2
DTC P0038
- HO2S Heater Control Circuit High Voltage Sensor 2
Diagnostic Fault Information
Circuit Description
The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the
operating temperature during extended idle periods. When the ignition is turned to the ON position, ignition voltage is supplied directly to the
sensor heater. The Engine Control Module (ECM) controls the heater operation by first modulating the control circuit to ground when the sensors
are cold. This prevents the possibility of thermal shock to the sensor, from condensation build-up on the sensor, by controlling the sensors rate of
heating. After a predetermined amount of time, the ECM commands the heaters ON continuously. Once the sensor reaches operating temperature,
