Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 505

66.2 SPN 706/FMI 4
This diagnosis is typically a short to ground.
66.2.1 Short to Ground Check
Check as follows:
1. Check for multiple codes.
[a] If 704/4 is active with 706/4, repair the short to ground between pin 93 of the
120–pin MCM connector and pin 2 of the EPV2 connector and pin 4 of the wastegate
connector. See Figure 66-2. Refer to section 66.2.1.1.
Figure 66-2 EPV2 (Entry Connecting Flap) and Wastegate
[b] If only 706/4 is active, go to step 2.
2. Disconnect the EPV2 connector.
3. Disconnect the 120–pin MCM connector.
4. Measure the resistance between pins 1 and 2 of the EPV2 connector.
[a] If the resistance is less than 5 Ω, repair the short between wires 66 and 93 of the
120–pin MCM connector. Refer to section 66.2.1.1.
[b] If the resistance is greater than 5 Ω, go to step 5.
5. Measure the resistance between pin 1 of the EPV2 connector and ground.
[a] If the resistance is less than 5 Ω, repair the short circuit between pin 1 of the EPV2
connector and ground. Refer to section 66.2.1.1.
[b] If the resistance is greater than 5 Ω, refer to section 66.2.1.1.
All information subject to change without notice.
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(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
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