Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 721

109.2 SPN 3659/FMI 10
This diagnostic condition is typically a short to ground.
109.2.1 Short to Ground Check
Check as follows:
1. Turn the ignition OFF.
2. Disconnect the 120–pin MCM connector.
3. Disconnect pins 1 and 2 of Electronic Unit Pump #1.
4. Measure the resistance between pins 1 and 2 of the Electronic Unit Pump #1 harness.
See Figure 109-2.
[a] If the resistance is less than 5 Ω, repair the short between pins 1 and 2 of the
Electronic Unit Pump #1 harness and pins 15 and 14 of the 120–pin MCM
connector.Refer to section 109.2.1.1.
[b] If the resistance is greater than 5 Ω, go to step 5.
Figure 109-2 Electronic Unit Pump #1
5. Measure the resistance between pin 1 of the Electronic Unit Pump #1 harness and ground.
[a] If the resistance is less than 5 Ω, repair the short to ground between pin 1of the
Electronic Unit Pump #1 harness and pin 15 of the MCM 120–pin connector.
Refer to section 109.2.1.1.
[b] If the resistance is greater than 5 Ω, repair the short to ground between pin 2 of
the Electronic Unit Pump #1 harness and pin 14 of the MCM 120–pin connector.
Refer to section 109.2.1.1.
All information subject to change without notice.
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
109-5