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P0690




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

DTCP0689
- 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 2 relays.

Conditions for Running the DTC

P0685, P0686, P0687

The DTC runs when Ignition 1 signal voltage is greater than 11 V.

P0689

* DTC P0685 is not set.

* The engine controls ignition relay is commanded ON.

* Ignition 1 signal voltage is greater than 11 V.

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

P0690

* P0685 is not set.

* The engine controls ignition relay is commanded OFF.

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

P1682

* The engine controls ignition relay is commanded ON.

* 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 ECM detects the engine controls ignition relay feedback circuit is less than 5 V when the engine controls ignition relay is commanded ON.

P0690

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

* The condition is present for greater than 5 s.

P1682

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

Action Taken When the DTC Sets

* DTCs P0685, P0686, P0687, P0689, and P0690 are Type B DTCs.

* DTC P1682 is a Type A DTC.

Conditions for Clearing the DTC

* DTCs P0685, P0686, P0687, P0689, and P0690 are Type B DTCs.

* DTC P1682 is a Type A 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 main relay, the ignition 1 relay, or the ignition relay.

Reference Information

Schematic Reference

* Engine Controls Schematics [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

* 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 any other DTC is set, diagnose that DTC 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 ignition relay ON and OFF with a scan tool while observing the following parameters:

* 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.

• If any parameter displays Malfunction
Refer to Circuit/System Testing

• If all parameters display OK or Not Run

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

• If any of the DTCs are set
Refer to Circuit/System Testing

• If none of the DTCs are set

3. 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.

• If any of the DTCs are set
Refer to Circuit/System Testing

• If none of the DTCs are set

4. All OK.

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 a test lamp illuminates between ground and the relay circuit terminals listed below:

* Terminal 85

* Terminal 30

• If the test lamp does not illuminate
Replace the front compartment fuse block. Refer to Front Compartment Fuse Block Replacement Service and Repair.

• If the test lamp illuminates

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.

* A short to voltage on any of the circuits supplied by the engine controls ignition relay can cause DTC P0690 to set.

3. Ignition ON.

4. Verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.

• If the test lamp illuminates

1. Ignition OFF, disconnect the X2 harness connector at the K20♦Engine Control Module.

2. Ignition ON.

3. Test for less than 1 V between ground and connector terminal 28.

• If 1 V or greater, repair the short to voltage in the circuit.

• If less than 1 V, replace the K20 Engine Control Module.

• If the test lamp does not illuminate

5. Ignition OFF, connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 30 and the relay switch ignition voltage circuit terminal 87.

6. Ignition ON.

7. 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 the parameter does not display B+ or the K20♦Engine Control Module does not communicate

1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module

2. Test for less than 2 ohms in the relay switch ignition voltage circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms

3. Test for infinite resistance between the relay switch ignition voltage circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K20 Engine Control Module.

• If the parameter displays B+

8. Ignition OFF, connect a DMM, set to the diode setting, between control circuit terminal 86 and ground.

9. Verify the DMM displays OL.

• If the DMM does not display OL

1. Disconnect the X1 harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between ground and the relay control circuit.

• If less than infinite resistance, repair the short to ground in the circuit.

• If infinite resistance, replace the K20 Engine Control Module.

• If the DMM displays OL

10. Ignition ON.

11. Verify the DMM displays less than 1 V.

• If the DMM does not display less than 1 V

1. Ignition OFF, disconnect the X1 connector at the K20 Engine Control Module.

2. Ignition ON.

3. Test for less than 1 V on the relay control circuit.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

4. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• if less than 2 ohms, replace the K20 Engine Control Module.

• If the DMM displays less than 1 V

12. Test or replace the KR75 Engine Controls Ignition Relay.

Component Testing

Relay Test

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

2. Test for 70-110 ohms between terminals 85 and 86:

• If less than 70 ohms or greater than 110 ohms
Replace the relay.

• If between 70-110 ohms

3. Test for infinite resistance between the terminals listed below:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If less than infinite resistance
Replace the relay.

• If infinite resistance

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.

5. Test for less than 2 ohms between terminals 30 and 87.

• If 2 ohms or greater
Replace the relay.

• If less than 2 ohms

6. All OK.

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, programming, and setup

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