Special Bulletin
Revision A:

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

1(16)

This document supersedes previous revisions.
Range of involved vehicles extended

ENGINE HARNESS REPLACEMENT –
OIL SEEPAGE AT UNIT INJECTOR PASS-THROUGH FITTING
Prevost vehicles
DESCRIPTION
On the vehicles affected by this bulletin, replace the engine harness as described in the following
procedure.

MODEL YEAR(S) AND VEHICLES INVOLVED
NOTICE TO SERVICE CENTERS
Verify vehicle eligibility by checking warranty bulletin status with SAP or via ONLINE WARRANTY
SYSTEM available on Service / Warranty tab of Prevost website.

Model

VIN
x

From 2PCG33497BC

up to 2PCG33491CC

incl.

x

From 2PCG3349XCC

up to 2PCG33495CC

incl.

X3-45 coaches
Model Year : 2011 - 2012

This bulletin does not necessarily apply to all the above-mentioned vehicles, some vehicles may have been modified before delivery. The
owners of the vehicles affected by this bulletin will be advised by a letter indicating the Vehicle Identification Number (VIN) of each
vehicle concerned.

MATERIAL NEEDED

US10 (vehicles up to 2PCG33494BC
Part No.

included) - Order kit “SP15-17”
Description

Qty

504637

CABLE TIE, NYLON

A-R

967343

O-RING, EGR CROSSOVER PIPE

1

983472

CABLE TIE, HIGH TEMPERATURE – UNDER VALVE COVER

6

8131393

RETAINER

4

20504408

CLAMP, V-BAND

1

21532258

O-RING, BREATHER TUBE

1

20538793

GASKET, VALVE COVER

1

22218696

ENGINE HARNESS

1

Special Bulletin

SP15-17A

US10+6 (vehicles starting from 2PCG33496BC
Part No.

Date

Expiration

Release

Page

05.2015

05.2017

2

2(16)

) - Order kit “SP15-17-1”
Description

Qty

504637

CABLE TIE, NYLON

A-R

967343

O-RING, EGR CROSSOVER PIPE

1

983472

CABLE TIE, HIGH TEMPERATURE – UNDER VALVE COVER

6

8131393

RETAINER

4

20504408

CLAMP, V-BAND

1

21532258

O-RING, BREATHER TUBE

1

20538793

GASKET, VALVE COVER

1

22218700

ENGINE HARNESS

1

NOTE
Material can be obtained through regular channels.

PROCEDURE

DANGER
Park vehicle safely, apply parking brake, stop engine. In the battery box, set the battery cut-off switch
to the OFF position prior to working on the vehicle.

NOTE
When performing removal of the existing engine harness, disconnect the exterior connectors
first and finish with the connectors located under the valve cover in order to avoid prolonged
period of time with cylinder head unprotected from dirt and foreign matter.
NOTE
One after the other, unplug the engine harness connectors, starting with the connectors found
outside of the engine block.
When necessary, clean the area around the connector to protect connector from dust and
foreign matter.
If necessary, identify each connecting points around the engine to ease installation of the
replacement harness.

Special Bulletin

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

3(16)

REQUIRED TOOLS
TORQUE WRENCH AND METRIC SOCKET
SET

RATCHET AND SOCKET SET – METRIC

RTV GASKET MAKER

CUTTING PLIERS

FIGURE 1: ENGINE HARNESS

Special Bulletin
12 sensor, oil level & temperature
13 aftertreatment sensor
14 sensor, pressure crankcase
15 sensor, oil pressure
16 17 solenoid valve, DRV
18 sensor, fuel pressure
19 pass-through
20 preheater, engine
21 unit injectors
22 solenoid valve, VEB
23 sensor, coolant temp
24 sensor, EGR
25 sensor, temp EGR
26 sensor, turbo speed

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

4(16)

27 VGT
28 sensor, comp discharge temp
29 sensor, oil cooling
30 oil thermostat
31 oil piston cooling jet
32 sensor, boost temp
33 CAN3
th
34 7 injector
35 solenoid valve, EGR
36 sensor, engine speed camshaft
37 sensor, engine speed crankshaft
38 39 ring terminal
40 electrical cable

Special Bulletin

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

5(16)

FIGURE 2: ENGINE SENSORS LOCATION

1 Engine Oil Level/Temperature

8 Camshaft Speed

2 Fuel Pressure

9 Exhaust Gas Recirculation (EGR) Diff. Pressure

3 Aftertreatment Fuel Pressure

10 EGR Temperature

4 Engine Oil Pressure (EOP)

11 Engine Coolant Temperature (ECT)

5 Crankshaft Speed

12 Piston Cooling Jet Oil Pressure Sensor

6 Crankcase Pressure (CCP)

13 Compressor Discharge Temperature Sensor

7 Intake Air Temperature/Pressure

Special Bulletin

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

6(16)

PROCEDURE
1. Inside the coach, remove the floor access panel.
2. Remove the EGR crossover pipe (3 clamps, fig.3).

FIGURE 3

3. Remove the clamp and disconnect the air compressor inlet
hose.
4. Remove the hose clamps (2 clamps, fig.4) at the air filter
housing and the turbocharger inlet. Remove the air intake
pipe as an assembly.

FIGURE 4

5. Remove the crankcase ventilation tube from the valve
cover (fig.5) and crankcase ventilation separator.

FIGURE 5

Special Bulletin

SP15-17A
Date

Expiration

Release

Page

05.2015

05.2017

2

7(16)

6. Disconnect the engine harness connections on the hot
side of the engine (fig. 1, 2 & 6). Remove all nylon cable
ties and P-clamps.
a)
b)
c)
d)
e)
f)
g)
h)

Turbine Shaft Speed Sensor
VGT (Variable Geometry Turbocharger Actuator)
EGR Temperature Sensor
Engine Coolant Temperature Sensor
Comp. Discharge Temperature Sensor
Oil Cooling Sensor
Oil Level & Temperature Sensor
Oil piston cooling jet
FIGURE 6
1) VGT
2) Turbine Shaft Speed Sensor

7. Move the harness from the hot side of the engine to the
front of the engine.
8. In the rear junction box, disconnect the starter wires from
the starter relay solenoid terminals and remove all nylon
cable ties (fig.7).

FIGURE 7

9. Disconnect the following rear engine harness
connections: camshaft position sensor, crankshaft
position sensor, and exhaust gas recirculation (EGR)
valve (fig.8). Remove P-clamps.
10. Remove all nylon cable ties and P-clamps holding the
harness to the rear of the engine. Move the harness
from the rear of the engine to the cold side of the
engine.

FIGURE 8
1) Exhaust Gas Recirculation (EGR) Valve
2) Camshaft Position Sensor
3) Crankshaft Position Sensor

Special Bulletin

SP15-17A
Date

Expiration

Release

Page