1A
DTC P0651: Sensor Reference Voltage 2 Circuit / Open
Wiring Diagram
For wiring circuit and connector number, refer to “K9K Engine (Type 5)” in A-4 Engine Control System Circuit Diagram .
NOTE:
If DTC P0651 is detected, the idle speed is locked at 1000 rpm, engine performance reduced to 75%.
Detecting Condition
Status displayed on SUZUKI scan tool Detecting condition Indicator / Warning light operation
CC0 Short circuit to ground Injection warning light (gravity 1 fault) light up
CO 0 Open circuit or short circuit to 12 V
Troubleshooting for CC0: Short Circuit to Ground
Check the connection and condition of the APP sensor connector.
Repair if necessary.
Check the condition and connection of the ECM “E17” connector.
Repair if necessary.
Check APP sensor referring to APP Sensor Inspection:K9K .
If the resistance is not, replace APP sensor.
Check for 5 V on “E97-2” terminal of the APP sensor connector.
Check for earth on “E97-6” terminal of the APP sensor connector.
Repair if necessary.
Check the insulation and continuity of the following connection:
Between “E17-15” terminal of the ECM connector and “E97-2” terminal of the APP sensor connector.
Repair if necessary.
Disconnect ECM “E17” connector and the APP sensor connector.
Check the earth insulation of the connection on “E17-15” terminal of the ECM connector.
Repair if necessary.
If DTC P0651 is still detected, replace the ECM.
Troubleshooting for CO 0: Open Circuit or Short Circuit to 12 V
Check the connection and condition of the APP sensor connector.
Repair if necessary.
Check the condition and connection of the ECM “E17” connector.
Repair if necessary.
Check APP sensor referring to APP Sensor Inspection:K9K .
Replace APP sensor if necessary.
Check for 5 V on “E97-2” terminal of the APP sensor connector.
Check for earth on “E97-6” terminal of the APP sensor connector.
Repair if necessary.
Disconnect ECM “E17” connector and the APP sensor connector.
• Check the insulation on ECM connector between “E17-15” and “E17-27” terminals.
• Check the +12 V insulation of the connection on “E17-15” terminal of the ECM connector.
Repair if necessary.
Check the insulation and continuity of the following connection:
• Between “E17-15” terminal of the ECM connector and “E97-2” terminal of the APP sensor connector.
• Between “E17-27” terminal of the ECM connector and “E97-6” terminal of the APP sensor connector.
Repair if necessary.
If DTC P0651 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.