Detroit Diesel EPA07 Series 60 DDEC VI Troubleshooting Manual page 734

96.2 SPN 2798/FMI 4
96.2 SPN 2798/FMI 4
This diagnosis is typically injector # 4, 5, or 6 needle control valve circuit is shorted to ground.
96.2.1 Short to Ground Check
Check as follows:
1. Disconnect the Rear Injector Harness 12–pin connector.
2. Inspect the Rear Injector Harness 12–pin connector for bent or spread pins, inspect the
connector seal for damage (signs of water or oil intrusion).
[a] If the water or oil intrusion, bent or spread pins are found, repair as necessary.
[b] If connector shows no signs of damage, go to step 3.
3. Measure the resistance between pin 3 on the valve cover side of the Rear Injector Harness
12–pin connector and ground. If you are using J-48671–10, measure between injector #4
pin 1 and ground.
[a] If the resistance is greater than 3 Ω, go to step 4.
[b] If the resistance is less than 3 Ω, go to step 6.
4. Measure the resistance between pin 5 on the valve cover side of the Rear Injector Harness
12–pin connector and ground. If you are using J-48671–10, measure between injector #5
pin 1 and ground.
[a] If the resistance is greater than 3 Ω, go to step 5.
[b] If the resistance is less than 3 Ω, go to step 6.
5. Measure the resistance between pin 9 on the valve cover side of the Rear Injector Harness
12–pin connector and ground. If you are using J-48671–10, measure between injector #6
pin 1 and ground.
[a] If the resistance is greater than 3 Ω, go to step 13.
[b] If the resistance is less than 3 Ω, go to step 6.
6. Remove the upper valve cover.
7. Disconnect injector #4.
8. Measure the resistance between pin 3 on the valve cover side of the Rear Injector Harness
12–pin connector and ground. If you are using J-48671–10, measure between injector #4
pin 1 and ground.
[a] If the resistance is greater than 3 Ω, replace the #4 injector. Refer to section 96.2.1.1.
[b] If the resistance is less than 3 Ω, go to step 9.
9. Disconnect injector #5.
10. Measure the resistance between pin 5 on the valve cover side of the Rear Injector Harness
12–pin connector and ground. If you are using J-48671–10, measure between injector #5
pin 1 and ground.
96-4
All information subject to change without notice.
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