1A
DTC P0203: Injector Circuit Malfunction – Cylinder 3
NOTE:
• Cylinder number is counted from flywheel side.
• Fault finding procedure application conditions for stored DTC:
The DTC is detected when engine is running at idle speed.
• When DTC P0203 occurs, the idle speed is locked at 1000 rpm, there is engine noise, the engine speed is unstable, and engine performance is reduced to 75%.
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
*CO Open circuit MIL and injection warning light (gravity 1 fault) light up
*CC Short circuit
D1 Parameter at limit minimum Injection warning light (gravity 1 fault) light up
D2 Parameter at limit maximum
Troubleshooting
Switch off the ignition and wait 15 seconds.
Check the connection and condition of the injector connector.
Repair if necessary.
Check the connection and condition of the ECM “C47” connector.
Repair if necessary.
Using SUZUKI scan tool, carry out the “Cylinder 3 Injector” (in output test on scan tool).
If injector 3 cannot be heard operating five times in a cycle, connect the wire of the injector of cylinder 4 to the injector of cylinder 3 and carry out the “Cylinder 4 Injector” (in output test on scan tool).
Does this injector actuation cycle work?
Yes Injector 3 is not defective; the fault is in the injector 3 control circuit.
Check for continuity and absence of interference resistance of the connections:
• Between “C47-46” terminal of ECM connector and “C38-1” terminal of injector No.3 connector
• Between “C47-45” terminal of ECM connector and “C38-2” terminal of injector No.3 connector
Repair if necessary.
If DTC P0203 is still detected, replace the ECM.
No Injector 3 is faulty, replace the cylinder 3 injector.
Troubleshooting for D1: At Minimum Stop, D2: At Maximum Stop
Check that the injector calibration codes are registered correctly in the ECM.
Check the connection and condition of the “C47-9” terminal of ECM connector.
Repair if necessary.
Check that the knock sensor is secured on the engine.
Repair if necessary.
After retightening the knock sensor, initialize the fuel pressure value by using “Initialize High Pressure Pump” under “Miscellaneous test” (“MISC TEST”) of SUZUKI scan tool.
If DTC P0202 is still detected, replace the cylinder 2 injector.
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.