2010 Cadillac Truck Escalade RWD V8-6.2L Page 2443

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2443

DTC Descriptor

DTC P1682

- Ignition 1 Switch Circuit 2

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

There are 2 ignition voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay,

through a fuse. This ignition voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC)

operation. The second ignition voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM

circuits. If the ECM detects a voltage difference between the 2 ignition voltage circuits, DTC P1682 will set.

Conditions for Running the DTC

* The ignition is ON.

* System voltage is more than 7 V.

* The powertrain relay is commanded ON.

* DTC P1682 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the voltage level difference is greater than 3 V between the 2 ignition 1 voltage circuits for less than 1 s.

Action Taken When the DTC Sets

DTC P1682 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1682 is a Type A DTC.

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).

Reference Information

Schematic Reference

* Engine Controls Schematics (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)

Electrical Information Reference

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

Testing/Circuit Testing)