Friday, January 21, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 1000

2010 Cadillac Truck SRX FWD V6-3.0L Page 1000



* Engine coolant consumption-Refer to Loss of Coolant (See: Engine, Cooling and Exhaust/Cooling System/Testing and



Inspection/Symptom Related Diagnostic Procedures/Loss of Coolant).



瀚慖f you find any of the above conditions, repair as necessary.



2. If all conditions test normal, test or replace the appropriate B52 HO2S.



Repair Instructions



Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control



Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 1)



* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 2)



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 1)



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 2)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming



P15A0



DTC P159F or P15A0



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)provide an overview of each diagnostic category.



DTC Descriptors



DTC P159F



- Fuel Economy Mode Switch Circuit Low Voltage



DTC P15A0



- Fuel Economy Mode Switch Circuit High Voltage



Diagnostic Fault Information



Circuit Description



The ECM supplies 5 V reference voltage, through the 5 V reference voltage circuit, to the S87 fuel economy mode switch. The 5 V reference



voltage causes current to flow through a series of resistors in the switch to the switch ground circuit. The ECM monitors the reference voltage



through a discrete fuel economy mode switch signal circuit. When the switch button is momentarily pressed, the switch contacts allow the 5 V



reference voltage to by-pass one of the resistors. The ECM detects the resulting voltage drop as a fuel economy mode request and sends a GMLAN



message to the transmission control module (TCM) indicating the request. When the TCM receives the request, throttle progressions and



transmission shift points are modified to optimize fuel efficiency. The instrument panel cluster (IPC) also receives the fuel economy mode request



message from the ECM and illuminates the fuel economy mode indicator lamp. The fuel economy mode switch must be pressed for between



0.094-1.5 s to activate the fuel economy mode.



Conditions for Running the DTC



* Ignition key must be turned to ON.



* DTCs P159F and P15A0 run continuously when the above condition is met.

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