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P1682




DTC P0685-P0687, P0689, P0690, or P1682

Diagnostic Instructions

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

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

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

DTC Descriptors

DTC P0685
- Engine Controls Ignition Relay Control Circuit

DTC P0686
- Engine Controls Ignition Relay Control Circuit Low Voltage

DTC P0687
- Engine Controls Ignition Relay Control Circuit High Voltage

DTC P0689
- Engine Controls Ignition Relay Feedback Circuit Low Voltage

DTC P0690
- Engine Controls Ignition Relay Feedback Circuit High Voltage

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). One is supplied by the engine controls ignition relay and the other is supplied by the ignition run relay. The ECM monitors and compares the ignition voltage supplied by the two relays.

Conditions for Running the DTC

P0685, P0686, P0687

The DTC runs continuously when the ignition voltage is greater than 11 V.

P0689

* The engine controls ignition relay is commanded ON.

* The ignition voltage is greater than 11 V.

* DTC P0685 is not set.

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

P0690

* The engine controls ignition relay is commanded ON.

* DTC P0685 is not set.

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

P1682

* The engine controls ignition relay is commanded ON.

* The ignition voltage is greater than 5.5 V.

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

Conditions for Setting the DTC

P0685

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 2 s.

P0686

The ECM detects a short to ground on the control circuit for greater than 2 s.

P0687

The ECM detects a short to voltage on the control circuit for greater than 2 s.

P0689

The engine controls ignition relay voltage is less than 5 V for greater than 5 s.

P0690

* The ECM detects the engine controls ignition relay feedback circuit is greater than 4 V when the relay is commanded OFF.

* The condition is present for greater than 5 s.

P1682

The ECM detects that there is greater than 3 V difference between the ignition run relay signal and the engine controls ignition relay signal circuits for less than 1 s.

Action Taken When the DTC Sets

* DTC P1682 is a Type A DTC.

* DTCs P0685, P0686, P0687, and P0690 are Type B DTCs.

* DTC P0689 is a Type C DTC.

Conditions for Clearing the DTC

* DTC P1682 is a Type A DTC.

* DTCs P0685, P0686, P0687, and P0690 are Type B DTCs.

* DTC P0689 is a Type C DTC.

Diagnostic Aids

The engine controls ignition relay may also be labeled the powertrain relay, the engine control module relay, or the main relay. The ignition run relay may also be labeled the run/crank relay, the ignition 1 relay, the ignition main relay, or the ignition relay.

Reference Information

Schematic Reference

* Engine Controls Schematics ((LFX)) [1][2]Electrical Diagrams

* Power Distribution Schematics Power Distribution Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Electrical Center Identification Views X50A Fuse Block - Underhood Label (North America)

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Note:

* A short to voltage on other components may cause DTC P0690 to set. If other DTCs are set, diagnose those DTCs first.

* If you were sent here from Engine Cranks But Does Not Run proceed to Circuit/System Testing.

1. Ignition ON, command the Engine Controls (EC) Ignition Relay ON and OFF with a scan tool while observing the parameters listed below:

* Engine Controls Ignition Relay Control Circuit Low Voltage Test Status

* Engine Controls Ignition Relay Control Circuit Open Test Status

* Engine Controls Ignition Relay Control Circuit High Voltage Test Status
Each parameter should display OK or Not Run in each commanded state.

2. Ignition ON, observe the DTC information with a scan tool. DTC P0685, P0686, P0687, P0689, P0690, or P1682 should not set.

3. Ignition ON, observe the scan tool Ignition 1 Voltage Signal and the Engine Controls Ignition Relay Feedback Signal parameters. There should be less than 3 V difference between the two parameters.

4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing unless sent here from Engine Cranks But Does Not Run.

1. Ignition OFF, disconnect the KR75 Engine Controls Ignition Relay.

2. Verify that a test lamp illuminates between ground and the relay circuit terminals listed below:

* Terminal 85

* Terminal 30

• If the test lamp does not illuminate, test the relay battery voltage circuit for an open/high resistance.

Note: High resistance in the circuit/underhood fuse block for either the engine controls ignition relay or the ignition run relay can cause DTC P1682 to set.

3. Ignition ON, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.

• If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.

4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 30 and the relay switch ignition voltage circuit terminal 87.

5. Ignition ON, observe the scan tool Engine Controls Ignition Relay Feedback Signal parameter. The K20 Engine Control Module should communicate, and the parameter should display B+.

• If not the specified value, or the K20 Engine Control Module does not communicate, test the ignition voltage circuit between the engine control module relay and the K20 Engine Control Module for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 Engine Control Module.

6. Ignition OFF, connect a DMM set to the diode setting between control circuit terminal 86 and ground. Verify the DMM displays OL.

• If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

7. Ignition ON, verify the DMM displays less than 1 V.

• If not the specified range, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

8. If all circuits test normal, replace the KR75 Engine Controls Ignition Relay.

Component Testing

1. Remove the KR75 Engine Controls Ignition Relay.

Note: Depending on the application, the relay coil resistance will be within one of the following ranges.

2. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 Engine Controls Ignition Relay:

* 70-110 ohms

* 200-250 ohms

• If not within the specified range, replace the KR75 Engine Controls Ignition Relay.

3. Test for infinite resistance between the following terminals of the KR75 Engine Controls Ignition Relay:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If not the specified value, replace the KR75 Engine Controls Ignition Relay.

4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

• If greater than the specified range, replace the KR75 Engine Controls Ignition Relay.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)

* Control Module References Control Module References for Engine Control Module replacement, setup, and programming

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