DD15 SPN 2798/FMI 3 Troubleshooting

SPN 2798/FMI 3

This diagnosis is typically injector #4, 5, or 6 needle control valve circuit has a short to battery/power.‪

Check as follows:‪

1. Disconnect the Rear Injector Harness 14–pin connector.
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pin 1 on the MCM side of the Rear Injector Harness 14–pin connector and ground.
   1. If there is voltage present, repair the short to power between pin 1 of the Rear Injector Harness 14–pin connector and pin 19 of the 120–pin MCM connector. Refer to “99.1.1 Verify Repairs” .
   2. If there is no voltage present, replace the under valve cover injector harness. Refer to “99.1.1 Verify Repairs” .

Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
   

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes.