2010 Cadillac Truck SRX FWD V6-3.0L Page 1256

2010 Cadillac Truck SRX FWD V6-3.0L Page 1256

replace the K20 ECM.

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 ECM.

6. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

7. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and the 5 V reference circuit terminal 11. Verify the scan tool Fuel

Rail Pressure Sensor voltage parameter is greater than 4.96 V.

瀚慖f less than the specified value, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace

the K20 ECM.

8. Ignition OFF, remove the intake manifold.

9. Connect the multi-way harness connector X198.

Note: Testing for steps 12 through 16 are performed at the fuel rail fuel pressure sensor connector.

10. Disconnect the B47 fuel rail fuel pressure sensor connector.

11. Remove the fuse that supplies B+ to terminal 52-X1 of the K20 ECM.

12. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal C and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.

13. Install the fuse that supplies B+ to terminal 52-X1 of the K20 ECM.

14. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A 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.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage.

15. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage.

16. Connect a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A. Verify the scan tool Fuel

Rail Pressure Sensor voltage parameter is greater than 4.96 V.

瀚慖f less than the specified value, test the signal circuit for an open/high resistance or a short to ground.

17. If all circuits test normal, replace the B47 fuel rail fuel pressure sensor.

Repair Instructions

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

* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure

Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)

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

P0193

DTC P0192 or P0193 (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 P0192

- Fuel Rail Pressure Sensor Circuit Low Voltage

DTC P0193

- Fuel Rail Pressure Sensor Circuit High Voltage