2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1483

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1483

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

Circuit/System Verification

Engine running, observe the scan tool Generator F-Terminal Signal Circuit parameter. The Generator F-Terminal Signal Circuit parameter should

display between 5-99%.

Circuit/System Testing

1. Verify that a test lamp illuminates between the G13 Generator B+ terminal A X1 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

2. Ignition OFF, disconnect the X2 harness connector at the G13 Generator.

3. Ignition ON, verify the scan tool Generator F-Terminal Signal parameter displays less than 5%.

瀚慖f greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20

Engine Control Module.

4. Install a 3 A fused jumper wire between B+ and the signal circuit terminal 2.

5. Verify the scan tool Generator F-Terminal Signal parameter displays greater than 95%.

瀚慖f less than the specified range, test the signal circuit terminal 2 for a short to ground or an open/high resistance. If the circuit tests

normal, replace the K20 Engine Control Module.

6. If the circuit tests normal replace the G13 Generator.

Repair Instructions

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

* Generator Replacement (LF1) (See: Starting and Charging/Charging System/Alternator/Service and Repair)Generator Replacement (LAU)

(See: Starting and Charging/Charging System/Alternator/Service and Repair)

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

P0626

DTC P0625 or P0626

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 P0625

- Generator F-Terminal Circuit Low Voltage

DTC P0626

- Generator F-Terminal Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) uses the generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the generator.

The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side