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P0690




DTC P0685 or P0690

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0685
- Engine Controls Ignition Relay Control Circuit

DTC P0690
- Engine Controls Ignition Relay Feedback Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The powertrain relay, which is PWR/TRN relay 33, is a normally open relay. The relay switch is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the relay switch contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit through an output driver module (ODM). The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the 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
* The battery voltage is between 9-18 volts.
* The ignition is ON.
* The powertrain relay has been commanded ON.

P0690
* The battery voltage is between 9-16 volts.
* The ignition is OFF.
* The powertrain relay has been commanded ON or OFF.

Conditions for Setting the DTC

P0685
* The commanded state of the ODM does not match and the actual state of the control circuit.
* The condition is present for more than 5 seconds.

P0690
* The ECM detects more than 2 volts on the ignition 1 voltage circuit to the ECM.
* The condition is present for more than 2 seconds.

Action Taken When the DTC Sets

DTCs P0685 and P0690 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0685 and P0690 are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, verify that the EC Ignition Relay Feedback Signal parameter indicates B+ voltage.
2. Ignition ON, command the powertrain relay ON and OFF. Listen or feel to verify that the powertrain relay turns ON and OFF with the commanded states.
3. Engine running, command the powertrain relay ON and OFF with a scan tool while observing the following powertrain relay coil control circuit status parameters:

* Powertrain Relay Coil Control Ckt. Short Gnd Test Status
* Powertrain Relay Coil Control Ckt. Open Test Status
* Powertrain Relay Coil Control Ckt. Short Volts Test Status
* Each parameter should toggle between OK and Not Run or Not Run and OK.

4. Ignition ON, engine OFF, with a test lamp, probe both test points of all the fuses that are powered by the powertrain relay. The test lamp should illuminate ON for at least one test point of each fuse.
5. 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

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the powertrain relay, which is PWR/TRN relay 33.
2. Ignition ON, verify that a test lamp does not illuminate between the ignition circuit terminal 30 and ground.

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

3. Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.

• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

5. Disconnect the X2 harness connector at the ECM.
6. Test for less than 2 ohms between ground and the ECM terminal 73 X2.

• If greater than the specified range, test the ground circuit for an open/high resistance.

7. Ignition ON, verify that a test lamp illuminates between connector terminal 19 X1 and ground.

• If the test lamp does not illuminate, test the circuit for an open/high resistance and a short to ground. If the circuit tests normal and its fuse is open, replace the ECM.

8. Ignition OFF, connect the harness connector at the ECM.
9. Ignition ON, connect a jumper wire between the B+ circuit terminal 87 and the ignition circuit terminal 30. Verify that the EC Ignition Relay Feedback Signal parameter indicates B+ voltage.

• If the parameter does not indicate B+ voltage, test the ignition circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

10. Ignition OFF, allow the ECM to completely power down.
11. Verify that a test lamp does not illuminate between the B+ circuit terminal 86 and the control circuit terminal 85.

• If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

12. Remove the test lamp.
13. Ignition ON, verify the scan tool EC Ign. Relay Ckt Short Volts Test Status parameter is OK.

• If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

14. Install a 3A fused jumper wire between the control circuit terminal 85 and the B+ circuit terminal 86. Verify the scan tool EC Ign. Relay Ckt Short Volts Test Status parameter is Fault.

• If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

15. If all circuits test normal, replace the powertrain relay.

Component Testing

* Measure for 70-110 ohms between terminals 85 and 86 of the relay.

• If the resistance is not within the specified range, replace the relay.

* Measure for infinite resistance between terminals 30 and 86 of the relay.

• If continuity is detected, replace the relay.

* Measure for infinite resistance between terminals 30 and 87 of the relay.

• If continuity is detected, replace the relay.

* Measure for infinite resistance between terminals 30 and 85 of the relay.

• If continuity is detected, replace the relay.

* Measure for infinite resistance between terminals 85 and 87 of the relay.

• If continuity is detected, replace the relay.

* Connect a 20A fused jumper wire from the battery positive cable at the battery to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay with a DMM.

• If the resistance measures more than 2 ohms, replace the relay.

Repair Instructions

* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Underhood Electrical Center or Junction Block Replacement (Underhood Electrical Center or Junction Block Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming

Repair Verification

1. Install any components that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 seconds.
5. Ignition ON, command the powertrain relay ON and OFF with a scan tool while observing the powertrain relay circuit status parameters. The circuit status parameters should change from OK to Not Run or Not Run to OK.

• If another DTC is present, refer to Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) and perform the appropriate diagnostic procedure.

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