BULLETIN NUMBER:
IB17-X-001C

IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL

ISSUE DATE:
JULY 2019
GROUP:
MISCELLANEOUS

INTRODUCTION TO FTR
AFFECTED VEHICLES


2018-2021 MY Isuzu FTR

This bulletin supersedes bulletin IB17-X-001B, which is being revised to update
affected model years. Please discard previous bulletin IB17-X-001B.
INFORMATION
The information below is provided to help technicians better understand common
vehicle operations that may be incorrectly perceived by customers as a problem.
Additionally, diagnostic scan tool connection requirements are outlined for easier
technician diagnosis.

Possible Customer
Complaint

Intermittent ticking or light
knocking noise from engine
area.

Check Engine Light/MIL On

Normal Condition Description
Purge valve noise - When the air tanks are at a full level, air
from the compressor will exhaust (exit) from the bottom of
the dryer. A ticking/light knocking sound may be heard from
the exhausting air. This sound can be confused with an
engine noise when standing outside of the vehicle on the
driver’s side at the back of the cab. This sound from air
exiting the dryer is normal and does not require repair. (See
Figure 1 below for purge valve location)
DTC P0027 may set when the vehicle is started and the
brake air pressure is very low or at 0 psi. This is most likely
to happen after the air system has been serviced or if the
vehicle has been stored for a long period of time and air
pressure has depleted. If this DTC was set after starting
under the previously described conditions and the exhaust
brake functions properly, there is no problem. The DTC
should be cleared before returning the vehicle back into
service.

Air Brake Pressure goes to
zero (0) psi after 2 – 3 days
storage

Brake squeal during braking

Roaring noise in the cab
while running

Light leakage from the air system is normal. Over the
course of 2 – 3 days of not running the engine this leakage
will deplete the pressure in the air system to zero (0) psi.
Normal air pressure will soon build up after the engine is
started.

Some brake noise is normal. Noise caused by glazing of
the brake shoes can be addressed by sanding the shoes
with 80 to 100--grit sandpaper. Sanding should not be done
in the direction of drum rotation. Drivers’ braking habits and
certain types of vehicle upfit can cause glazing.
Fan noise – Because the cooling fan is directly underneath
the cab, a vehicle operator might interpret “fan noise” to be
a problem when it is not. The viscous fan clutch will
typically engage both during initial start-up and when there
is a lot of heat from the radiator air flow. The sound of the
cooling fan engaging is normal and only seems unusually
“loud” because the fan is located directly underneath the
cab.

Water dripping from the
dash vent and water on the
floor mat

During periods of high ambient humidity, moisture may drip
from the HVAC outlets while operating the air conditioning.
To alleviate this, customers should keep the windows rolled
up and utilize “outside” air mode when operating the air
conditioning.

Radio is muted when the
gear lever is moved to the
reverse (R) position.

The radio automatically mutes when reverse (R) is selected
to allow the driver to concentrate completely on his or her
surroundings while the truck is moving backwards. This is a
normal condition.

Purge Valve
Figure 1

SCAN TOOL COMMUNICATION with FTR
No.

1.

Description

The metal case
IDSS interface will
only communicate
with the listed
Electronic Control
Units (ECUs).

ECUs
Engine
Control
Module
(ECM)
DEF Control
Module
(DCU)
Mimamori
ECU
Fleet
Management
System (if
equipped)
(FMS)

ECM

2.

The IDSS Tablet
will communicate
with all onboard
ECUs.

DCU
Mimamori
ECU
Electronic
Brake Control
Module
(EBCM)
FMS (if
equipped)

IDSS Interface/Scan Tool

ECM
3.

The plastic case
IDSS interface will
communicate with
all onboard ECUs.

DCU
Mimamori
ECU
EBCM
FMS (if
equipped)

ECM

4.

A new interface
cable with double
red ends is
required for
complete
communication
with all onboard
ECUs.

DCU
Mimamori
ECU
EBCM
FMS (if
equipped)

ECM

5.

A new interface Ycable is required
for complete
communication
with all onboard
ECUs.

DCU
Mimamori
ECU
EBCM
FMS (if
equipped)

Transmission control module (TCM) data can only be retrieved using Allison DOC
Software. IDSS currently does not support Allison DOC Software.
6.