Captiva

DTC P0685, P0689, P0690, or P1682

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

P0685, P0690

P1682

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.

P0690

P1682

The ECM detects that there is greater than 3 V difference between the Run/Crank relay signal and the Main relay signal circuits for less than 1 s.

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

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 (EC) Ignition Relay ON and OFF with a scan tool while observing the following Engine Controls Ignition Relay control circuit status 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.

2. Ignition ON, observe the DTC information with a scan tool. DTC P0685, P0690, or P1682 should not set.
3. Ignition ON, observe the scan tool Ignition 1 Voltage Signal and the Engine Controls Ignition Relay Feedback Signal parameters. There should be less than 3 V difference between the two parameters.
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.

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 KR73 Main relay.
2. Verify that a test lamp illuminates between ground and the relay circuit terminals listed below:

•	Terminal 85

•	Terminal 30

⇒	If the test lamp does not illuminate, test the relay battery voltage circuit for an open/high resistance.

Note: 

•	The ignition voltage circuit is between the Main relay and the ECM. The ignition voltage circuit is a feedback circuit.

•	High resistance in the circuit/underhood fuse block for either the Main relay or the run/crank relay can cause DTC P1682 to set.

3. Ignition ON, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.

⇒	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. Ignition ON, observe the scan tool Engine Controls Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display B+.

⇒	If not the specified value, or the ECM does not communicate, test the ignition voltage circuit between the Main 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.

6. Ignition OFF, connect a DMM set to the diode setting between control circuit terminal 86 and ground. Verify the DMM displays OL.

⇒	If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Ignition ON, verify the DMM displays less than 1 V.

⇒	If not the specified range, test the control circuit for a short to voltage, or an open circuit/high resistance. If the circuit tests normal, replace the K20 ECM.

8. If all circuits test normal, replace the KR73 Main relay.

1. Remove the KR73 Main relay.

Note: Depending on the application, the relay coil resistance will be within one of the following ranges.

2. Test for one of the following resistance specifications between terminals 85 and 86 of the KR73 Main relay:

•

70-110 Ω

•

200-250 Ω

⇒	If not within the specified range, replace the KR73 Main relay.

3. Test for infinite resistance between the following terminals of the KR73 Main relay:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If not the specified value, replace the KR73 Main 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.

⇒	If greater than the specified range, replace the KR73 Main relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.