To determine if a faulty fuel injector is causing the cylinder to misfire, perform the following steps:
1. Install DDL adaptor to the data cable and plug the adaptor into the DDL connector in the
vehicle; refer to OEM guidelines.
2. Start and run the engine at no-load.
3. From the DDEC VI Select Menu, scroll to select ENGINE and press the ENTER key.
4. Scroll to FUEL INJECTOR INFO (CUTOUT) and press the ENTER key.
5. Scroll to select NEW TEST and press the ENTER key.
6. Scroll to select RPM SETTING FOR CCO TEST NORMAL and scroll to select 1000
and press the ENTER key.
7. Scroll to select AUTO and press the ENTER key. Wait for END OF TEST.
NOTE:
If an injector cannot be cutout, an ERROR message will appear. Press FUNC to exit the
cylinder cutout function, press the FUNC key.
8.Scroll the list to review the results of the cylinder cutout test. To find suspect injectors,
look for a cylinder with a value that is within 0.2° of the NO CUTOUT PULSE WIDTH,
by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE
WIDTH values.
[a]If any CUTOUT PULSE WIDTH values are within 0.2° of the NO CUTOUT PULSE
WIDTH, shut down the engine; refer to section 8.5.1.
[b]If any CUTOUT PULSE WIDTH values are not within 0.2° of the NO CUTOUT
PULSE WIDTH, shut down the engine; refer to section 8.6.
8.5.1
Faulty Fuel Injector Repair
Perform the following steps for faulty fuel injector assembly(s):
1. Remove and replace injector assembly(s) whose values are within 0.2° of the NO
CUTOUT PULSE WIDTH; refer to appropriate service manual, fuel system chapter.
2. Verify replaced injector assembly(s); refer to section 8.5.1.1.
8.5.1.1
Verification of Repair for Faulty Fuel Injector
Perform the following to determine if the replaced fuel injector(s) resolved the excessive exhaust smoke condition:
1. Refer to section 8.5 for exhaust caution before proceeding. Start the engine.
2. Run the engine speed to full load.
3. Visually inspect the exhaust for excessive smoke.
[a] If the engine exhaust emission appears normal, no further troubleshooting is required.
Shut down the engine.
[b] If the engine exhaust emission is excessive, check for defective turbocharger;
refer to section 8.6. Shut down the engine.
