relay ISUZU TF SERIES 2004 Workshop Manual

HEATER AND AIR CONDITIONING 1-95

MAGNETIC CLUTCH DOES NOT RUN


Replace
YES

Are the A/C thermo (X-15), heater & A/C (X-11)
and A/C compressor (X-14) relay OK?


Are the No. SBF 8 fuse (30A) and the No. EB-13
(10A) fuses OK
YES

Is the pressure switch (C-24) OK?
YES


Are the A/C switch (B-57) and the fan switch (B-13)
OK?
NO
YES


Is there continuity between the engine harness
connector terminal No.1 (E-2) and engine room
harness connector terminal No.2 (X-14)?


Disconnect the A/C compressor relay.


Turn the ignition switch "ON" (Engine is running)

A/C switch and fan control knob (fan switch "ON")
NO
Replace
NO
Defective switch or insufficient
refrigerant
NO
NO
Does the magnetic clutch
operate?
YES
Replace


Disconnect the magnetic clutch connector.


Is there battery voltage between the engine room
harness connector terminal No.1 (E-2) and ground?
Defective compressor
YESNO
Defective magnetic clutch

1-96 HEATER AND AIR CONDITIONING




Open circuit between the engine
harness connector terminal No.1 (E-
13) and engine room harness
connector terminal No.2 (X-14).
YES


Is there battery voltage between the engine room
harness connector terminal No.1 (X-14) and
ground?
YES


Disconnect the A/C thermo relay.
YES

Is there continuity between the ECM harness
connector terminal No. 11 (E-61) and engine
room harness connector terminal No.4 (X-14)?
NO
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No.1 (X-14).
NO
Open circuit between the No.EB-13
fuse and engine room harness
connector terminal No. 3 (X-14).
NO

Is there battery voltage the engine room harness
connector terminal No.3 (X-14) and ground?
YES


Is there continuity between the ECM harness
connector terminal No.31 (E-61) and engine
room harness connector terminal No.1 (X-15)? Open circuit between the ECM
harness connector No. 11 (E-61) and
engine room harness connector
terminal No. 4 (X-14).
NO
YES

Is there battery voltage between the engine room
harness connector terminal No.3 (X-15) and
ground?
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 2 (X-15).
NO
YES

Is there continuity between the engine room harness
connector terminal No. 4 (X-15) and the engine room
harness connector terminal No. 1 (C-24)?
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 3 (X-15).
NO


Disconnect the ECM harness connector.

Disconnect the pressure switch.

HEATER AND AIR CONDITIONING 1-97



YES

Disconnect the condenser fan relay connector
condenser fan.
YES


Is there battery voltage between the engine
room harness connector terminal NO. 3 (C-
24) and ground? Open circuit between the condenser
fan relay No.4 (X-6) 4JAH No. 3 (X-
13) and engine room harness
connector terminal No. 4 (X-14).
NO

Is there continuity between the relay terminal
No. 4 (X-6) and engine room harness connector
terminal No.4 (C-24)?
YES

connect the A/C thermo relay connector.
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 4 (C-24).
NO
YES

Is there battery voltage between the engine
room harness connector terminal No.3 (C-55)
dd?
Open circuit between the engine room
harness connector terminal No. 2 (C-
24) and the engine room harness
connector terminal No. 2 (C-55).
NO
YES

Is there continuity between the engine room
harness connector terminal No.1 (C-55) and
ground (C-109) ? Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 3 (C-55).
NO


Disconnect the electronic themostat.


Is there continuity between the engine room
harness connector terminal No. 2 (C-55) and the
engine room harness connector terminal No. 2
(C-24)?
Open circuit between the engine
room harness connector terminal
No. 4 (X-15) and the engine room
harness connector terminal No. 1(C-
24).
NO

1-100 HEATER AND AIR CONDITIONING



Replace
YES


Are the A/C thermo (X-15), heater & A/C (X-11)
and A/C compressor (X-14) relay OK?


Are the No. SBF 8 fuse (30A) and the No. EB-13
(10A) fuses OK?
YES


Is the pressure switch (C-24) OK?
YES


Are the A/C switch (B-57) and the fan switch (B-13)
OK?
NO
YES


Is there continuity between the engine harness
connector terminal No.1 (E-2) and engine room
harness connector terminal No.2 (X-14)?

Disconnect the A/C compressor relay.


Turn the ignition switch "ON" (Engine is running)


A/C switch and fan control knob (fan switch "ON")
NO
Replace
NO
Defective switch or insufficient
refrigerant
NO
NO
Does the magnetic clutch
operate?
YES
Replace


Disconnect the magnetic clutch connector.

Is there battery voltage between the engine room
harness connector terminal No.1 (E-2) and ground?
Defective compressor
YESNO
Defective magnetic clutch

HEATER AND AIR CONDITIONING 1-101



Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No.1 (X-14).
NO
YES


Is there battery voltage between the engine room
harness connector terminal No.1 (X-14) and
ground?
YES


Disconnect the A/C thermo relay.
YES


Is there continuity between the ECM harness
connector terminal No. 14 (C-56) and engine
room harness connector terminal No.4 (X-14)?
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 3 (X-14).
NO


Is there battery voltage the engine room harness
connector terminal No.3 (X-14) and ground?
YES


Is there continuity between the ECM harness
connector terminal No. 26 (C-56) and engine
room harness connector terminal No. 1 (X-15)?Open circuit between the ECM
harness connector No.14 (C-56) and
engine room harness connector
terminal No. 4 (X-14).
NO
YES

Is there battery voltage between the engine room
harness connector terminal No. 2 (X-15) and
ground?
Open circuit between the ECM
harness connector No. 26 (C-56) and
the engine room harness connector
terminal No. 1 (X-15).
NO
YES


Is there continuity between the engine room
harness connector terminal No. 3 (X-15) and the
engine room harness connector terminal No. 1 (C-
24
).
Open circuit between the No. EB-13
fuse and engine room harness
connector terminal No. 4 (X-15).
NO


Disconnect the ECM harness connector.

Disconnect the pressure switch?
Open circuit between the engine harness
connector terminal No.1 (E-3) and engine
room harness connector terminal No.2 (X-
14).
NO

1-102 HEATER AND AIR CONDITIONING



YES


Disconnect the condenser fan relay connector condenser
fan.
YES

Is there battery voltage between the engine room
harness connector terminal NO. 3 (C-24) and ground?Open circuit between the condenser fan
relay No.3 (X-7) and engine room harness
connector terminal No. 4 (X-14).
NO

Is there continuity between the relay terminal No. 3 (X-7)
and engine room harness connector terminal No.4 (C-
24)?
YES
Open circuit between the No. EB-13 fuse
and engine room harness connector
terminal No. 4 (C-24).
NO
YES


Is there continuity between the engine room harness
connector terminal No. 2 (C-55) and the engine room
harness connector terminal No. 2 (C-24)?
Open circuit between the engine room
harness connector terminal No. 4 (CX-15)
and the engine room harness connector
terminal No. 1 (C-24).
NO


Disconnect the pressure switch.


Is there continuity between the engine room harness
connector terminal No. 4 (X-15) and the engine room
harness connector terminal No. 1 (C-24).
Open circuit between the No. EB-13 fuse
and engine room harness connector
terminal No. 2 (X-15).
NO


Connect the A/C thermo relay connector.


Disconnect the electronic thermostat.

IMMOBILIZER SYSTEM 11A-3

General Description
The immobilizer system consists of the four major
components which are Engine Control Module (ECM),
Immobilizer Control Unit (lCU), transponder, and scan
tool (Tech-2).
This system can be activated by a correctly programmed
transponder and starter switch is set to OFF.
This system can be deactivated by a correctl
y
programmed transponder key connected with a correctly
programmed ECM and a correctly programmed lCU.
While the system is on :
The starter cut off relay deactivates function of starter,
and the fuel injector power source is deactivated also.


Check Engine lamp is flashing.


Warning buzzer is operating.
(With antitheft system)






Gasoline Engine (6VE1, C24SE)

LTW3BALF000101

11A-6 IMMOBILIZER SYSTEM

What happens without proper transponder
operation?
One of the function of transponder is to deactivate or
activate starter function. lf the proper transponder is not
used, starter cannot be operated. Because starter rela
y
stays off, cranking engine is not possible.
After the starter relay is activated, transponder signal
triggers to let lCU calculate by transponder address
signal and immobilizer algorithm.
When the result matches with necessary condition, it
makes injector power source be activated.
If transponder does not send correct signal, lCU and
ECM do not activate injector system on.
Therefore the vehicle cannot be operated.
No proper transponder is available, what
should be done for the system?
When any proper transponder is not available, a new
transponder should be programmed. Up to 5
transponders can be provided with a scan tool (Tech-2)
and by proper procedure.
In addition to the absence of proper transponder, it ma
y
happen particular secret code to the particular vehicle is
missing. ln this case, the secret code must be provided
by your organization.
Otherwise transponder cannot be programmed in an
y
way.
lf the essential for a scan tool (Tech-2) for programming
and proper software for Tech-2 are not available, there
is no permanent way to fix system. Temporary replace
with new ECM, new ICU and new transponder without
any secret code can make the system be deactivated,
but it does not last long. Such a replacement does not
solve any condition. Even after replacement, the system
is activated automatically in short time and then no
operation of the vehicle can be made in any way.
Tech-2 should be provided in your organization.
Caution to the operation
lf an attempt is made to start the engine while the
immobilizer system is activated, the check engine lamp
flashes and the engine will not start.
Summary of operation
Switch on: Set the ignition and starter switch to OFF.
(Activate)
Switch off: Set the ignition and starter switch to ON b
y
using the transponder key. (Deactivate)

What your organization should provide for
your customer





Car Pass

For a new owner, your dealership must hand Car Pass
card, which has identification numbers of new owner's
vehicle immobilizer system. This information is ver
y
important in case of repair or lost of transponder.
The followings are necessary items provided by you
r
responsibility.
1)
Car pass with identification for a new owner
2)
Blank car pass card when it is for reissue
3)
Instruction to dealers how to use car pass card






Security code management

Your organization must keep security codes for all
vehicles as confidential data. Once the security codes
are lost, anybody who have the security code can
access immobilizer system. Your organization has
responsibility of any missing vehicles caused by stolen
security code.






Essential tool (Scan tool : Tech-2)

Your dealership must have Tech-2, and Tech-2 updated
software for immobilizer system.

11A-12 IMMOBILIZER SYSTEM

Pin-outs; For Electronic Control Engine (6VE1, C24SE, 4JH1-TC, 4JA1-TC)
RUW38HSF000201


No. Pin Function
A-1 Antenna coil positive
A-2


A-3 Antenna coil negative
B-1 Starter Relay (6VE1, C24SE Engine) / Immobilizer Relay (4JH1-TC/4JA1-TC Engine)
B-2 Ground
B-3 Voltage from ignition switch ON
B-4 Back up voltage supply
B-5 To Tech-2
B-6 Vehicle speed sensor (6VE1, C24SE Engine) / Not used (4JH1-TC/4JA1-TC Engine)
B-7 Communication: carry on line from ECM to ICU (Check engine lamp)
B-8 Communication: carry on line from ICU to ECM (Communication line W)

11A-14 IMMOBILIZER SYSTEM

Pin-outs




RUW48HSF000201


No. Pin Function
1 Back up voltage supply
2 Voltage from ignition switch ON
3 Lamp
4


5


6 Antenna coil positive
7 Ground
8 Engine immobilizer unit
9 To Tech2
10


11

12


13 Antenna coil negative
14 Starter cut relay