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
