2010 Cadillac CTS Sedan AWD V6-3.6L Page 1051

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1051

Circuit/System Description

The engine control module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel

injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits

and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is

disabled.

Conditions for Running the DTC

* The engine is running.

* The ignition voltage is between 11-18 V.

* The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P1248, P1249, P124A, P124B, P124C, or P124D

The ECM detects the injector high voltage supply circuit is shorted to the injector high voltage control circuit for greater than 2 s.

Action Taken When the DTC Sets

DTCs P1248, P1249, P124A, P124B, P124C, and P124D are Type A DTCs.

Conditions for Clearing the DTC

DTCs P1248, P1249, P124A, P124B, P124C, and P124D are Type A DTCs.

Diagnostic Aids

* Performing the fuel injector coil test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test (w/LLT) (See:

Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Injector

Solenoid Coil Test)Fuel Injector Solenoid Coil Test (w/LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel

Injector/Testing and Inspection).

* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Injector

Control Circuit Status parameters. An Injector Control Circuit Status parameter will change from OK or Not Run to Fault if there is a

condition with the circuit or a connection.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics