2010 Cadillac Truck SRX FWD V6-3.0L Page 1505

2010 Cadillac Truck SRX FWD V6-3.0L Page 1505

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

J 41413-200 - Evaporative Emission System Tester (EEST)

Circuit/System Verification

1. Remove the fuel cap.

2. Ignition ON, engine OFF.

3. Observe the Fuel Tank Pressure Sensor parameter with a scan tool.

4. The Fuel Tank Pressure Sensor parameter should be 1.3-1.7 V.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B150 fuel tank pressure sensor.

2. Ignition OFF, test for less than 5 ohm of resistance between the low reference circuit terminal 2 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

ECM.

3. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool B150 fuel tank pressure sensor parameter is less than 0.2V.

瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5V reference circuit terminal 3. Verify the scan tool fuel tank

pressure sensor parameter is greater than 4.7V.

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

K20 ECM.

6. If all circuits test normal, test or replace the B150 fuel tank pressure sensor.

Repair Instructions

* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service

and Repair)

* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic

procedure.

* For DTC P0451 or P0454, clear DTCs with a scan tool.

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

P0453

DTC P0451-P0454 (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 P0451

- Fuel Tank Pressure Sensor Performance