NHTSA ID Number: 10164461
Manufacturer Communication Number: MI19-32
TSB/Document Date: 2019-09-05
Summary
This Maintenance Information explains how to install harness #7770134, designed to bypass the Engine Compartment Harness (Prevost
part), connecting the DPF harness (10-pin connector) and the Engine Harness (31-pin connector).
MAINTENANCE
INFORMATION
DATE :
SUBJECT :
MI19-32
September 2019
SECTION : 01 ENGINE
DETROIT DIESEL DDEC VI
DPF HARNESS TO ENGINE HARNESS
BYPASS HARNESS
First Release
(MCM)
08-29-19
IMPORTANT NOTICE
This modification is recommended by Prevost to increase your vehicle's performance. Note that no
reimbursement will be awarded for carrying out this modification.
APPLICATION
Model
All US07 vehicles equipped with DDEC VI Detroit Diesel engine
DESCRIPTION
Harness #7770134 is designed to bypass the Engine Compartment Harness (Prevost part). It
connects between two Detroit Diesel harnesses that are the DPF harness (10-pin connector)
and the Engine Harness (31-pin connector).
Harness #7770134 may prevent replacing the complete Engine Compartment Harness
depending on the issue. Usually the issue is engine shutting down due to DPF temperature
spike. A “high exhaust temperature” diagnostic troubleshooting code may be present.
MATERIAL NEEDED
Part No.
Description
Qty
7770134
BYPASS HARNESS (DPF TO MCM)
1
685678
EXTRACTION TOOL FOR AMP 2.5 mm TERMINAL
1
NOTE
Material can be obtained through regular channels.
Writer:
EL
MI19-32
Page 2 / 6
PROCEDURE
DANGER
Park vehicle safely, apply parking brake, stop engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.
Lock out & Tag out (LOTO) must be performed during set-up, maintenance or repair activities. Refer to
your local procedure for detailed information regarding the control of hazardous energy.
Writer:
EL
MI19-32
Page 3 / 6
DPF HARNESS
1. Locate connector A74 (10-pin) of the DPF harness.
2. On the A74 connector half found at the end of the engine
compartment harness, extract circuits 505, 506, 507, 508, 511,
512, 513, 514.
Terminal extraction
1) Remove the PLR. Pull from the posts.
2) Use extraction tool (or small screwdriver) to remove the
terminals.
3) Slightly lift the plastic lock tab in the cavity while pulling on
the wire to remove the terminal out of the rear of the
connector housing.
Writer:
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MI19-32
Page 4 / 6
3. Replace with circuits 505, 506, 507, 508, 511, 512, 513, 514 of
the bypass harness #7770134. See the pin-out table at right.
Writer:
EL
Connector A74 – 10-PIN
DPF harness connector pinout
CIRCUIT
PIN
505
506
507
508
511
512
513
514
1
2
4
3
5
6
7
8
MI19-32
Page 5 / 6
ENGINE HARNESS
4. Locate connector A73.J1 (31-pin MCM pigtail) of the engine
harness.
5. On the A73.J1 connector half found at the end of the engine
compartment harness, extract circuits 505, 506, 507, 508,
511, 512, 513, 514.
Use extraction tool #685678
6. Replace with circuits 505, 506, 507, 508, 511, 512, 513, 514
of the bypass harness #7770134. See the pin-out table at
right.
Connector A73.J1 – 31-PIN
MCM pigtail connector (engine
harness) pin-out
CIRCUIT
505
506
507
508
511
512
513
514
Writer:
EL
PIN
28
29
30
31
17
18
19
24
MI19-32
Page 6 / 6
FINAL STEP
7. Protect all the original circuits from corrosion using good
quality adhesive-lined heat shrink tubing. Appropriately
secure the harness with nylon ties.
8. Check that there are no related DTC’s. You may use DDDL
software if available.
PARTS / WASTE DISPOSAL
Discard according to applicable environmental regulations (Municipal/State[Prov.]/ Federal)
Access all our Service Bulletins on http://techpub.prevostcar.com/en/
Or scan the QR-Code with your smart phone
.
Are you a Vehicle owner?
E-mail us at technicalpublications_prev@volvo.com and type “ADD” in the subject to
receive warranty bulletins applicable to your vehicle(s) by e-mail.
Writer:
EL
- 6X better wear protection on critical engine parts than...
- 1.3X better sludge protection than industry standards*
- 3X Stronger against viscosity breakdown than leading full...
- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
- Extra detergents safeguard against friction, corrosion and...
- Advanced friction-fighting additives help maximize...
- Provides performance benefits for high mileage, new and...
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TSB/Document ID: MI19-32
Replacement Service Bulletin Number:
MFR Communication Date: 2019-08-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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