Fuel Injection Nozzle Diagnosis: Notes

If an injection nozzle is not properly delivering fuel into the pre-combustion chamber of a cylinder, driveability could be greatly effected, or a diagnostic trouble code (DTC) could be set. If other diagnosis indicates, or if the injection nozzles are suspected of not properly delivering fuel, they should be tested. Typically, a nozzle failure can be detected by using the injector balance test.

Nozzle testing is comprised of the following checks:

• Injector Balance test (performed with scan tool)
• Nozzle opening pressure (see Important statement)
• Leakage (see Important statement)