1A
DTC P0641: Sensor Reference Voltage 1 Circuit / Open
NOTE:
This DTC indicated only with SUZUKI scan tool.
Priority when dealing with a number of DTCs:
If DTC P0641 and either one of DTC P0100, DTC P0190, DTC P0225, DTC P0235, DTC P0409, DTCP0530 or DTC P2120 are detected, deal with DTC P0641 Sensor Reference Voltage 1 Circuit/Open first.
If DTC P0641 is detected, engine stopped and starting impossible.
Wiring Diagram
For wiring circuit and connector number, refer to “K9K Engine (Type 5)” in A-4 Engine Control System Circuit Diagram .
Detecting Condition
Status displayed on SUZUKI scan tool Detecting condition Indicator / Warning light operation
D1 Parameter at limit minimum Red stop warning light (gravity 2 fault) light up
D2 Parameter at limit maximum
Troubleshooting
Check the condition and connection of the connectors on all sensors with a 5 V feed.
A/C pressure sensor
Boost pressure sensor
Fuel pressure sensor
APP sensor
EGR valve
MAF and IAT sensor
Repair if necessary.
Check the condition and connection of ECM connectors “E17”, “C47” and “C48”.
Repair if necessary.
To locate any internal fault in one of the sensors with a 5 V supply (short circuit), disconnect earth of the sensors on the list above.
Clear DTC and recheck DTC. If the faulty sensor is located, check its connections and that it is in order.
If necessary replace the sensor.
Check the insulation, continuity and absence of interference resistance of the connections:
Between “C48-3” terminal of ECM connector and “E100-3” terminal of A/C pressure sensor
Between “C47-16” terminal of ECM connector and “C49-1” terminal of boost pressure sensor
Between “C47-15” terminal of ECM connector and “C91-1” terminal of fuel pressure sensor
Between “E17-4” terminal of ECM connector and “E97-3” terminal wire of APP sensor
Between “C47-17” terminal of ECM connector and “C46-4” terminal wire of EGR valve
Between “C47-18” terminal of ECM connector and “C98-5” terminal of MAF and IAT sensor
Repair if necessary.
If DTC P0641 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.