DTC P0685, P0689, P0690 or P1682 (LFW)
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DTC P0685, P0689, P0690 or P1682 (LFW)
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DTC P0685
Engine Controls Ignition Relay Control Circuit
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
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Diagnostic Fault Information
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Powertrain Relay
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Relay Coil Supply Voltage
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-
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P0685, P0689, P1682
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-
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Relay Control Circuit
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P0690
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P0685, P0689, P1682
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P0685, P0689, P1682
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Relay Feedback Circuit
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P0689, P1682
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P0689, P1682
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P0690
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Run/Crank Relay
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Ignition 1 Signal
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1
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1
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2
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1. Will cause a No Crank condition.
2. Engine continues to operate with ignition OFF.
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Engine Controls Ignition Relay Control Circuit Low Voltage, Open, and High Voltage Test Status - Component Commanded OFF
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating conditions:
Component commanded OFF
Parameter Normal Range:
The following illustrates the normal parameter state with no circuit conditions:
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Component OFF - OK for Open/Low Voltage test and Not Run for High Voltage test
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Component ON - Not Run for Open/Low Voltage test and OK for High Voltage test
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Battery Voltage
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-
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Malfunction
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-
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Engine Controls Ignition Relay Control Circuit
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Malfunction
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Malfunction
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Not Run
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Engine Controls Ignition Relay Control Circuit Low Voltage, Open, and High Voltage Test Status - Component Commanded ON
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating conditions:
Component commanded ON
Parameter Normal Range:
The following illustrates the normal parameter state with no circuit conditions:
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Component OFF - OK for Open/Low Voltage test and Not Run for High Voltage test
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Component ON - Not Run for Open/Low Voltage test and OK for High Voltage test
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Battery Voltage
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-
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Not Run
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-
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Engine Controls Ignition Relay Control Circuit
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Not Run
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Not Run
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Malfunction
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Circuit/System Description
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There are 2 ignition voltage circuits in the engine control module (ECM). One circuit is supplied by the powertrain relay and the other is supplied by the run/crank relay. The ECM monitors and compares the ignition voltage supplied by the 2 relays.
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Conditions for Running the DTC
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P0685
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Ignition 1 signal voltage is between 11-32 V.
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The DTC runs continuously once the above conditions are met.
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P0689, P0690
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The powertrain relay is commanded on.
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The DTC runs continuously once the above conditions are met.
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P1682
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The powertrain relay is commanded on.
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Ignition 1 Signal voltage is greater than 5.5 V.
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The DTC runs continuously once the above conditions are met.
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Conditions for Setting the DTC
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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 that the engine controls ignition relay feedback circuit is less than 5 V when the relay is commanded ON.
P0690
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The ECM detects the engine controls ignition relay feedback circuit is greater than 2 V when the relay is commanded OFF.
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The ECM detects the engine controls ignition relay feedback circuit is greater than 18 V when the relay is commanded ON.
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The condition is present for greater than 2 s.
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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.
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Action Taken When the DTC Sets
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DTCs P0685 and P0690 are Type B DTCs.
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DTC P1682 is a Type A DTC.
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DTC P0689 is a Type C DTC.
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Conditions for Clearing the DTC
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DTCs P0685 and P0690 are Type B DTCs.
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DTC P1682 is a Type A DTC.
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DTC P0689 is a Type C DTC.
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Schematic Reference
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Note
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A short to voltage on other components may cause DTC P0690 to set. If any other DTC is set, diagnose that DTC first.
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If you were sent here from Engine Cranks But Does Not Run, proceed to Circuit/System Testing.
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Ignition ON, command the Engine Controls Ignition Relay ON and OFF with a scan tool while observing the following Engine Controls Ignition Relay control circuit status parameters:
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Engine Controls Ignition Relay Control Circuit Low Voltage Test Status
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Engine Controls Ignition Relay Control Circuit Open Test Status
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Engine Controls Ignition Relay Control Circuit High Voltage Test Status
Each parameter should display OK or Not Run in each commanded state.
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2.
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Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. DTCs P0685, P0689, P0690, or P1682 should not set.
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3.
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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.
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Note
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You must perform the Circuit/System Verification before proceeding with Circuit/System Testing unless sent here from Engine Cranks But Does Not Run.
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1.
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Ignition OFF, disconnect the KR75 powertrain relay.
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2.
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Verify a test lamp illuminates between ground and the relay circuit terminals listed below:
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3.
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If the test lamp does not illuminate, test the relay battery voltage circuit for an open/high resistance.
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4.
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Note
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The ignition voltage circuit is between the powertrain relay and the ECM. The ignition voltage circuit is a feedback circuit.
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High resistance in the circuit/underhood fuse block for either the powertrain relay or the run/crank relay can cause DTC P1682 to set.
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Ignition ON, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 30 and ground.
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5.
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If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
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6.
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Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 87 and the relay switch ignition voltage circuit terminal 30.
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7.
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Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display B+.
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8.
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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/high resistance. If the circuit/connections test normal, replace the K20 ECM.
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9.
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Ignition OFF, connect a DMM set to the diode setting between control circuit terminal 85 and ground. Verify the DMM displays OL.
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10.
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If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
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11.
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Ignition ON, verify the DMM displays less than 1 V.
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12.
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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 ECM.
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13.
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If all circuits test normal, replace the KR75 powertrain relay.
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1.
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Note
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Depending on the application, the relay coil resistance will be within one of the following ranges.
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Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay:
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2.
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If not within the specified range, replace the KR75 powertrain relay.
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3.
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Test for infinite resistance between the following terminals of the KR75 powertrain relay:
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4.
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If not the specified value, replace the KR75 powertrain relay.
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5.
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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.
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6.
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If greater than the specified range, replace the KR75 powertrain relay.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
