1A
DTC P0685: Main Relay Control Circuit Malfunction
Wiring Diagram
For wiring circuit and connector number, refer to “K9K Engine (Type 5)” in A-4 Engine Control System Circuit Diagram .
Detecting Condition
NOTE:
Generic scan tool displays status with * mark only.
Status displayed on SUZUKI scan tool Detecting condition Indicator / Warning light operation
*D1 Relay stuck open Does not light
D2 Relay stuck shut
Troubleshooting
Check the main relay supply fuse in main fuse box.
Replace the fuse if necessary.
Check the connection and condition and connection of the main relay socket.
Repair if necessary.
Check the condition and connection of the ECM connectors “E17” and “C48”.
Repair if necessary.
Check for insulation, continuity and absence of interference resistance of the connections:
• Between main fuse output and “C52-2” and “C52-4” terminal of main relay socket terminal
• Between “C54-1” terminal of main relay socket and “C48-24” terminal of ECM connector
• Between “C54-3” terminal of main relay socket and “E17-2” terminal of ECM connector
• Between “C54-3” terminal of main relay socket and “C48-30” terminal of ECM connector
• Between “C54-3” terminal of main relay socket and “C48-29” terminal of ECM connector
• Between “E17-1” terminal of ECM connector and vehicle body ground
• Between “E17-6” terminal of ECM connector and vehicle body ground
• Between “E17-7” terminal of ECM connector and vehicle body ground
• Between “E17-8” terminal of ECM connector and vehicle body ground
Repair if necessary.
Check main relay for operation referring to Main Relay and Radiator Fan Relay Inspection:K9K .
Replace the main relay if necessary.
If DTC P0685 is still detected, replace the ECM.
After Repair
Deal with any faults detected by SUZUKI scan tool.
Clear the DTC.
Carry out a road test followed by another check with the SUZUKI scan tool.