DD15 SPN 3598/FMI 4 Troubleshooting

SPN 3598/FMI 4

This fault indicates the Proportional Valve Bank 2 circuit has failed low.‪

Check as follows:‪

1. Turn the ignition OFF.
2. Disconnect the Rear Valve Cover Injector Harness connector.
   
3. Measure the resistance between pin 14 on the engine side of the Valve Cover Injector Harness connector and ground.
   1. If the resistance is less than 5 Ω, repair the short to ground between the Rear Valve Cover Injector Harness and the medium (rear) engine brake solenoid.
   2. If the resistance is greater than 5 Ω, go to the next step.
4. Disconnect the EGR Valve connector.
5. Measure the resistance between pin 1 of the EGR Valve and ground.Note: This measurement is ON the EGR Valve.
   1. If the resistance is less than 5 Ω, replace the EGR Valve. Refer to “117.1.1 Verify Repairs” .
   2. If the resistance is greater than 5 Ω, go to the next step.
6. Disconnect the MCM 120–pin connector.
7. Measure the resistance between pin 1 of the EGR Valve Harness connector and ground.
   1. If the resistance is less than 5 Ω, repair the short to ground between pin 62 of the MCM 120–pin connector and the EGR Valve/Rear Valve Cover Injector Harness connectors. Refer to “117.1.1 Verify Repairs” .
   2. If the resistance is greater than 5 Ω, go to the next step.
8. Disconnect the Fuel Cutoff Valve connector.
9. Measure the resistance between pin 2 of the Fuel Cutoff Valve Harness connector and ground.
   1. If the resistance is less than 5 Ω, go to the next step.
   2. If the resistance is greater than 5 Ω, replace the Doser Block Assembly. Refer to “117.1.1 Verify Repairs” .
10. Disconnect the Electronic Dosing Valve connector.
11. Measure the resistance between pin 2 of the Electronic Dosing Valve connector and ground.
    1. If the resistance is less than 5 Ω, repair the short to ground between pin 64 of the MCM 120–pin connector and the Electronic Dosing Valve/Fuel Cutoff Valve connector.Refer to “117.1.1 Verify Repairs” .
    2. If the resistance is greater than 5 Ω, replace the Doser Block Assembly. Refer to “117.1.1 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.