2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 2020

With a scan tool, attempt to communicate with all modules.

Circuit/System Testing

1. With a scan tool, verify DTC U0100-U0299 or U2105-U2199 is not set as current.

瀚慖f DTC is set, refer to DTC U0100-U02FF (See: U Code Charts/U0100) or DTC U2105-U2199 (See: U Code Charts/U2105).

2. Ignition OFF, test for less than 5 ohm between the applicable module ground circuit and ground.

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

3. Ignition OFF, disconnect the applicable module harness connector.

4. Ignition ON, verify a test lamp illuminates between the following circuits of the applicable module and ground:

* The battery positive voltage input circuits

* The battery positive voltage output circuits

* The ignition voltage input circuits

* The ignition voltage output circuits

* The switched battery positive voltage supply circuits

瀚慖f the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuit fuse is open, test the circuit for a short to

ground. If the circuit tests normal, replace the applicable control module.

5. Ignition OFF, test for less than 5 ohm between the non-communicating modules GMLAN serial data circuits and the module reporting DTC

U0002.

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

6. If all circuits test normal, replace the applicable control module.

Repair Instructions

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

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

* GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Wiring Repairs/GMLAN Wiring Repairs)

U02FF

DTC U0100-U02FF

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 Descriptor

Refer to Control Module U Code List (See: Diagnostic Trouble Code Descriptions/Control Module U Code List).

Diagnostic Fault Information