2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1535

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1535

relay ON, ignition voltage is supplied to several fuses in the underhood fuse block.

The ignition 1 voltage that is supplied to the ECM through the ETC fuse provides power to the internal ECM circuits associated with the throttle

actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay

contacts have closed.

Conditions for Running the DTC

P0685, P0686, and P0687

* The ignition voltage is between 10-18 V.

* The engine speed is greater than 80 RPM.

* The powertrain relay has been commanded ON and OFF.

* The DTCs run continuously once the above condition is met.

P0689 and P0690

* The ignition voltage is between 10-18 V.

* The ignition is ON.

* The DTCs runs continuously once the above condition is met.

Conditions for Setting the DTC

P0685, P0686, and P0687

The commanded state of the driver and the actual state of the control circuit do not match for greater than 4 s or for a cumulative of 30 s.

P0689 and P0690

The ECM detects that powertrain relay feedback voltage is less than 6 V for greater than 1 s, when the powertrain relay is commanded ON or OFF.

The condition exists for 4 s, or for a cumulative of 30 s.

Action Taken When the DTC Sets

DTCs P0685, P0686, P0687, P0689, and P0690 are Type C DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0685, P0686, P0687, P0689, and P0690 are Type C DTCs.

Diagnostic Aids

* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:

Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).

* An open in the relay control circuit will cause no communication with the ECM when the ignition switch is cycled OFF and then ON after

the initial failure. The malfunction indicator lamp (MIL) will flash rapidly and other relays can be heard turning on and off with the ignition

ON.

* When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals

for corrosion and the mating electrical terminals for tightness.

* Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness

terminals, or the ECM wire harness connector terminals.

Reference Information

Schematic Reference

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

Schematics (LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Distribution Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

* Electrical Center Identification Views (See: Maintenance/Fuses and Circuit Breakers/Fuse/Application and ID)

* Probing Electrical Connectors (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Circuit Testing/Probing Electrical Connectors)