Service Information

Cruze

DTC P1682

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P1682 00: Ignition 1 Switch Circuit 2

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Voltage (Powertrain Relay)	P0689 00, P1682 00	P0689 00, P1516 00, P1682 00, P2101 00	P0690 00	-
Ignition 1 Voltage (Run/Crank Relay)	-	P1682 00	-	-

Typical Scan Tool Data

Ignition 1 Signal

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF. Powertrain ignition relay commanded ON.
Ignition 1 Signal	0 V	0 V	B+

Engine Controls Ignition Relay Feedback Signal

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF. Powertrain ignition relay commanded ON.
Engine Control Ignition Relay Feedback Signal	0 V	0 V	B+

There are 2 ignition voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay, through fuse F10UA 15 A. 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 fuse F5UA 15 A, 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 00 will set.

Conditions for Running the DTC

•	The ignition is ON.

•	System voltage is more than 6 V.

•	Powertrain relay is commanded ON.

•	DTC P1682 00 runs continuously when the above conditions are met.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note: On the scan tool, the powertrain relay is referred to as the Engine Controls Ignition Relay.

Ignition ON, observe the DTC information with a scan tool. Verify DTCs P0685 00, P0689 00, or P0690 00 are set.

⇒	If any of the above DTCs are set, refer to DTC P0685, P0689, or P0690 .

Ignition ON, observe the scan tool Engine Control Ignition Relay Feedback signal parameter. The parameter should display B+.

⇒	If less than the specified value, refer to DTC P0685, P0689, or P0690 .

Ignition ON, observe the scan tool Ignition 1 Signal and the Engine Control Ignition Relay Feedback signal parameters. Both parameters should display within 3 V.
Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing

Ignition OFF, disconnect the K20 Engine Control Module connector X1 and the K20 Engine Control Module connector X2.
Ignition ON, test for B+ between the K20 Engine Control Module harness connector terminals listed below and ground:

•	Terminal X1 19

•	Terminal X2 13

•	Terminal X2 28

⇒	If less than the specified value, repair the appropriate ignition voltage circuits for a short to ground or an open/high resistance.

If all circuits test normal, replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References