SB 3132

Subject: Ambient Temperature Sensor Relocation
Field change Program:
Service Bulletin
Coach Section:
07-Electrical
Bulletin Number: Revision:
3132
A
P/N:
07-08-3145, 07-08-7232
Date:
03/20/2020
Type:
Product Improvement
Application:
Coach Model
Model Year
VIN
J4500
2018 - 2020
68377 - 69944
J3500
2019 - 2020
68877, 68909, 68935, 68965, 21000 - 21068
Read this entire procedure before beginning work.
Use Safe Shop Practices at All Times.
To avoid personal injury:
a. Proper Personal Protective Equipment (PPE) must be worn. Safety glasses and
protective gloves are required for working with DEF Fluid.
b. Turn the main battery disconnect switch to the OFF position.
c. Ensure that both the front and the rear wheels are chocked.
d. Position the ENGINE RUN and ENGINE START switches on the engine
compartment remote control box to the OFF position.
e. Allow enough time for components to cool down prior to working in the engine
compartment.
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
1.0
Description
This bulletin outlines the steps to relocate the ambient temperature sensor from the spare
tire compartment to the bumperette to improve the accuracy of the sensor reading. This
bulletin needs to be done in conjunction with Service Bulletin 3123.
2.0
Material requirements
For coaches equipped with an ISX/ X12 engine, no material is required.
For coaches equipped with a DD13 engine, the following material is required:
ITEM
1
3.0
PART NO
19-4-7
QTY U/M
1
EA
DESCRIPTION
Clamp - Line Support, 29/32 Dia
Special tools
No special tools required.
4.0
Procedure for the coaches equipped with an ISX/ X12 engine
4.1
Disconnecting the ambient temperature sensor
Open the front junction box door by pulling the lever on the driver’s left-hand console.
Pull the lever to
open Front Junction
Box door
Open front junction
box door
Motor Coach Industries Ltd.
Page 2 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Remove and discard the nut and bolt securing the p-clamp. Save the p-clamp
Remove and discard
the bolt and nut
Unplug the harness from the ambient temperature sensor. Save the ambient temperature
sensor.
Unplug the harness
4.2
Rerouting the ambient temperature sensor to the bumperette
Cut the tie wraps securing the sensor harness.
Cut tie wraps
Motor Coach Industries Ltd.
Page 3 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Pull the grommet of the clearance hole through which the fog light harness is fed to the
exterior.
Pull the grommet
CAUTION
Do not damage the fog light harness passing through the grommet
Feed the sensor harness through the grommet into the cavity behind the LH bumperette.
Cavity behind the LH
bumperette
Feed sensor harness
through the grommet
Re-install the grommet.
Motor Coach Industries Ltd.
Page 4 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
4.3
Re-installing the ambient temperature sensor
Pull the front bumper link to open the front bumper.
Pull the front bumper link
Re-connect the harness to the ambient temperature sensor.
Remove and save the bottom bolt of the LH bumperette.
Remove and save the bolt
Motor Coach Industries Ltd.
Page 5 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Install the ambient temperature sensor to the bumperette at the location of the bottom
bolt using existing p-clamp and bolt.
Install ambient temperature sensor
using existing p-clamp and bolt
Make sure to face the sensor upwards as shown in the picture above.
5.0
Procedure for the coaches equipped with a DD13 engine
5.1
Disconnecting the ambient temperature sensor
Open the front junction box door by pulling the lever on the driver’s left-hand console.
Pull the lever to
open Front Junction
Box door
Opened Front
Junction Box door
Motor Coach Industries Ltd.
Page 6 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Remove and discard the washer and nut securing the ambient temperature sensor.
Remove and discard
the washer and nut
Unplug the harness from the ambient temperature sensor. Save the ambient temperature
sensor.
5.2
Rerouting the ambient temperature sensor harness to the bumperette
Cut the tie wraps securing the sensor harness.
Unplug the harness
Cut tie wraps
Motor Coach Industries Ltd.
Page 7 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Pull the grommet through which the fog light harness is fed to the exterior.
Pull the grommet
CAUTION
Do not damage the fog light harness passing through the grommet
Feed the sensor harness through the grommet into the cavity behind the LH bumperette.
Cavity behind the LH
bumperette
Feed sensor harness
through the grommet
Re-install the grommet.
Motor Coach Industries Ltd.
Page 8 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
5.3
Re-installing the ambient temperature sensor
Pull the front bumper link to open the front bumper.
Pull the front bumper link
Re-connect the harness to the ambient temperature sensor.
Remove and save the bottom bolt of the LH bumperette.
Remove and save the bolt
Motor Coach Industries Ltd.
Page 9 of 10
SERVICE BULLETIN 3132
Ambient Temperature Sensor Relocation
Install the ambient temperature sensor to the bumperette at the location of the bottom
bolt using a p-clamp, MCI P/N: 19-4-47, and existing bolt.
Install ambient temperature sensor
using p-clamp and existing bolt
Make sure to face the sensor upwards as shown in the picture above.
End of the procedure
Motor Coach Industries Ltd.
Page 10 of 10