To the top of the document
Volt
   
GMDE Start Page Load static TOC Load dynamic TOC Help?

DTC P0685, P0689, P0690, or 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 Descriptors

DTC P0685: Engine Controls Ignition Relay Control Circuit

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

Powertrain Relay

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Relay Control Circuit

C0242, P0690, P1682

C0242, P0102, P0141, P0598, P0689, P0AB9, P0AC4, P1682

C0242, P0102, P0135, P0141, P0598, P0685, P0689, P0AB9, P0AC4, P1682, U0168

Relay Feedback Circuit

C0242, P0689, P1682

C0242, P0689, P1682

P0690

Run/Crank Relay

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Ignition 1 Signal

C0848, C1241, P0335* , P0700, P0AB9, P2535*, P2535**, P2535***, P2537, U0100, U1818, U1861

C0848, C1241, P0335*, P0700, P0AB9, P2535*, P2535**, P2535***, P2537, U0100, U1818, U1861

1

1. Engine continues to operate with Vehicle OFF.

* Hybrid powertrain control module DTC

** Transmission control module DTC

*** Hybrid powertrain control module 2 DTC

Typical Scan Tool Data

Engine Controls Ignition Relay Control Circuit Open, Low Voltage, High Voltage Test Status--Component Commanded OFF, Vehicle OFF

Circuit

Short to Ground

Open

Short to Voltage

Operating Conditions: Component commanded OFF and Vehicle OFF.

Parameter Normal Range: The following illustrates the normal parameter state with no circuit conditions:

    • Component OFF - OK for Open/Low Voltage Test Status and Not Run for High Voltage Test Status
    • Component ON - Not Run for Open/Low Voltage Test Status and OK for High Voltage Test Status

Battery Voltage

-

Malfunction

-

Engine Controls Ignition Relay Control Circuit

Malfunction

Malfunction

Not Run

Engine Controls Ignition Relay Control Circuit Open, Low Voltage, High Voltage Test Status--Component Commanded ON

Circuit

Short to Ground

Open

Short to Voltage

Operating Conditions: Component commanded ON

Parameter Normal Range: The following illustrates the normal parameter state with no circuit conditions:

    • Component OFF - OK for Open/Low Voltage Test Status and Not Run for High Voltage Test Status
    • Component ON - Not Run for Open/Low Voltage Test Status and OK for High Voltage Test Status

Battery Voltage

-

Not Run

-

Engine Controls Ignition Relay Control Circuit

Not Run

Not Run

Malfunction

Circuit/System Description

There are 2 ignition voltage circuits supplied to the engine control module (ECM). One is supplied by the powertrain relay, or EC ignition relay, and the other is supplied by the Run/Crank relay. The ECM monitors and compares the ignition voltage supplied by the 2 relays.

Conditions for Running the DTC

P0685

    • The vehicle is ON.
    • The ignition voltage is greater than 11 V.
    • The DTC runs continuously when the above conditions are met.

P0689

    • DTC P0685 is not set.
    • The powertrain relay is commanded on.
    • The ignition voltage is greater than 11 V.
    • The DTC runs continuously when the above conditions are met.

P0690

    • DTC P0685 is not set.
    • The powertrain relay is commanded on.
    • The DTC runs continuously when the above conditions are met.

P1682

    • The powertrain 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.

P0689

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

P0690

    • The ECM detects the engine controls ignition relay feedback circuit is greater than 2 V when the powertrain relay is commanded OFF.
    • The condition is present for greater than 4 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

P0685, P0690

    • DTCs P0685 and P0690 are Type B DTCs.
    • A message centre displays Propulsion Power is Reduced.
    • Under certain conditions, the ECM commands the engine OFF.

P0689

    • DTC P0689 is a Type C DTC.
    • A message centre displays Propulsion Power is Reduced.
    • Under certain conditions, the ECM commands the engine OFF.

P1682

    • DTC P1682 is a Type A DTC.
    • A message centre displays Propulsion Power is Reduced.
    • Under certain conditions, the ECM commands the engine OFF.

Conditions for Clearing the DTC
    • DTCs P0685 and P0690 are Type B DTCs.
    • DTC P0689 is a Type C DTC.
    • DTC P1682 is a Type A DTC.

Reference Information

Schematic Reference

    •  Engine Controls Schematics
    •  Power Distribution Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Electrical Centre Identification Views
    •  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: 

   • A short to voltage on a power feed circuit for another component 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. Vehicle in Service Mode, observe the DTC information with a scan tool. Verify no other DTCs are set.
    2. ⇒If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. Command the Engine Controls Ignition Relay ON and OFF with a scan tool while observing the following parameters:
    3. • 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.
  3. Observe the scan tool DTC information. DTC P0685, P0689, P0690, or P1682 should not set.
  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. Vehicle OFF, disconnect the KR75 powertrain relay.
  2. Verify a test lamp illuminates between ground and the relay circuit terminals listed below:
    3. • Terminal 86
    • 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 powertrain relay or the run/crank relay can cause DTC P1682 to set.

  3. Vehicle in Service Mode, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.
    4. ⇒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. Observe the scan tool Engine Controls Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display B+.
    6. ⇒If not the specified value, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM for a short to ground or for an open circuit/high resistance. If the circuit/connections test normal, replace the K20 ECM.
  6. Vehicle OFF, connect a DMM set to the diode setting between control circuit terminal 85 and ground. Verify the DMM displays OL.
    7. ⇒If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  7. Vehicle in Service Mode, verify the DMM displays less than 1 V.
    8. ⇒If not within the specified range, test the control circuit terminal 85 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  8. If all circuits test normal, replace the KR75 powertrain relay.

Component Testing
  1. Vehicle OFF, disconnect the KR75 powertrain relay.
  2. Test for 70-110 Ω between terminals 85 and 86 of the KR75 powertrain relay.
    3. ⇒If not within the specified range, replace the KR75 powertrain relay.
  3. Test for infinite resistance between the following terminals of the KR75 powertrain relay:
    4. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    ⇒If not the specified value, replace the KR75 powertrain 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 Ω between terminals 30 and 87.
    5. ⇒If greater than the specified range, replace the KR75 powertrain relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement : Within an Electrical Centre → Attached to Wire Harness
    • Control Module References for ECM replacement, setup, and programming
   


&#169© Copyright Chevrolet. All rights reserved