DTC P0686, P0687, P0689, or P0690 (LPL or LPV)
Diagnostic Instructions
DTC Descriptor
| DTC P0686 00: Engine Controls Ignition Relay
Control Circuit Low Voltage |
| DTC P0687 00: Engine Controls Ignition Relay
Control Circuit High Voltage |
| DTC P0689 00: Engine Controls Ignition Relay
Feedback Circuit Low Voltage |
| DTC P0690 00: Engine Controls Ignition Relay
Feedback Circuit High Voltage |
Circuit/System Description
The powertrain relay is controlled by the engine control module
(ECM) depending upon input from the ignition switch. Battery
positive voltage is supplied to the relay coil and switch. When the
ignition switch is turned to the ON position, the ECM will provide
ground on the control circuit of the powertrain relay using a low
side driver. This will allow voltage through the relay switch
contacts to the components. The ECM monitors the voltage level on
the control circuit of the powertrain relay.
Conditions for Running the DTC
| • |
The ignition is ON, or the
engine is running. |
| • |
The ignition voltage is
between 11-18 V. |
| • |
These DTCs run continuously
once the above conditions are met. |
Conditions for Setting the DTC
P0686 00
The ECM detects the engine controls powertrain relay circuit is
less than 5 V when the relay is commanded ON for 5 s.
P0687 00
The ECM detects the engine controls powertrain relay circuit is
greater than 5 V when the relay is commanded ON for 5 s.
P0689 00
The ECM detects the engine controls powertrain relay feedback
circuit is less than 5 V when the relay is commanded ON for 5 s.
P0690 00
| • |
The ECM detects the engine
controls powertrain relay feedback circuit is greater than 2 V when
the relay is commanded OFF. |
| • |
The ECM detects the engine
controls powertrain relay feedback circuit is greater than 18 V
when the relay is commanded ON. |
Action Taken When the DTC Sets
DTCs P0686 00, P0687 00, P0689 00 and P0690 00 are Type B
DTCs.
Conditions for Clearing the DTC
DTCs P0686 00, P0687 00, P0689 00 and P0690 00 are Type B
DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
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
Circuit/System Verification
| 1. |
Cycle the ignition from OFF to
ON. You should hear and feel an audible click from the KR75
Powertrain Relay. Repeat as necessary in order to verify KR75
Powertrain Relay operation. |
| 2. |
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
| 1. |
Ignition OFF, disconnect the
KR75 Powertrain Relay. |
| 2. |
Ignition ON, verify a test
lamp illuminates between the B+ circuit terminal 30 and
ground. |
| ⇒ |
If the test lamp does not illuminate, test the B+
circuit for a short to ground or an open/high resistance. Replace
the fuse if necessary. |
| 3. |
Ignition OFF, connect a test
lamp between the control circuit terminal 85 and the B+ circuit
terminal 30. |
| ⇒ |
If the test lamp is always ON, test the control
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
| 4. |
Ignition ON. The test lamp
should turn ON. |
| ⇒ |
If the test lamp is always OFF, test the control
circuit for a short to voltage or an open/high resistance. If
circuit tests normal, replace the K20 Engine Control Module. |
| 5. |
Install a 20 A fused jumper
wire between the B+ circuit terminal 30 and the ignition circuit
terminal 87. |
| 6. |
Attempt to start the engine.
The engine should start. |
| ⇒ |
If the engine does not start, test the ignition
circuit between the KR75 Powertrain Relay and the K20 Engine
Control Module for a short to ground or for an open/high
resistance. If the circuit tests normal, replace the K20 Engine
Control Module. |
| 7. |
If all circuits test normal,
test or replace the KR75 Powertrain Relay. |
Component Testing
Relay Test
| 1. |
Ignition OFF, disconnect the
KR75 Powertrain Relay. |
| 2. |
Measure for 70-110 Ω
between terminals 85 and 86 of the KR75 Powertrain Relay.
|
| ⇒ |
If the resistance is not within the specified
range, replace the KR75 Powertrain Relay. |
| 3. |
Measure for infinite
resistance between following terminals of the KR75 Powertrain
Relay: |
| ⇒ |
If continuity is detected, replace the KR75 Powertrain
Relay. |
| 4. |
Connect a 20 A fused jumper
wire from the positive terminal of the battery to KR75 Powertrain
Relay terminal 85. Connect a jumper wire from the negative terminal
of the battery to KR75 Powertrain Relay terminal 86. Measure for
less than 5 Ω between KR75 Powertrain Relay terminal 30 and
KR75 Powertrain Relay socket terminal 87. |
| ⇒ |
If the resistance measures more than 5 Ω,
replace the KR75 Powertrain Relay. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
