P0263

CYLINDER CONTRIBUTION/BALANCE












1. CHECK THE FLOW DAMPER.
1. Turn the starter switch to "LOCK" position. Stop the engine.
2. Wait for about 30 seconds and then start the engine.
3. Perform warm-up until the coolant temperature becomes 60 °C {140 °F} or higher. And erase the DTC.







4. If the same DTC is displayed again after erasing it, inspect the flow damper of displayed cylinder.

Inspection:
a. When removing the flow damper from the common rail, check that the piston is not sticking in the body. If the piston sticks, replace the flow damper.
b. Inspect the contact surface 1 between piston and fuel supply port. If there is wear and damage, replace the flow damper assembly.
c. Inspect clogging on the piston orifice. Clean or replace the flow damper assembly.







2. RECHECK THE DTC.
1. Check that the other DTC is not displayed.
If the other DTC is displayed, repair the trouble.
If the same DTC is displayed again, it is possibly from the following problems
a. Excessive fuel flow will cause fuel leakage from injection pipe (between flow damper and injector) by bending, cracking and pipe connection looseness.
- Check leakage.

b. Excessive or shortage fuel flow will cause an increase in the internal leakage of injector.
- Check injector leakage using nozzle tester.

c. Excessive fuel flow will cause injector seat defection.
- Check injector nozzle seat using nozzle tester.

d. Excessive or shortage fuel flow will cause injector operation malfunction.
- Check by replacing the injector. e. Shortage fuel flow will cause clogging of the fuel supply system.
- Check fuel filter.

2. The above problems can be diagnosed using the "Data Monitor" menu to determine the cylinder contribution quantity and "Activation Test" menu to stop the injector.