ECO mode ISUZU TROOPER 1995 Repair Manual

7A-122 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 52
KICK DOWN ALWAYS ON OR SHORT TO GROUND
This DTC does NOT flash the CHECK TRANS
indicator and does
NOT set the BACKUP MODE.
Circuit Description:
• When the driver presses the accelerator pedal
down fully, the kick down switch closes, sending
a
ground signal to the Transmission Control
Module (TCM).
• This information is used to do shifts with a high
Engine Speed RPM.
• When the kick down switch is closed the Throttle
Position Sensor (TPS) is already at 100%.
Diagnostic Aids:
• This diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
1
I
I
I
I
----
KICK DOWN SWITCH INPtit
C-90 LT BLU
85
C-91 H-11
• Detection conditions:
G) Kick down switch ON (short to ground) and
TPS
<70%.
@ No malfunction: TPS short to voltage or
ground (DTC21 and DTC22).
@ The conditions need to be present for at least
1 second.
•
Action after the detection time: Kick Down
information not taken into account.
• Recovery conditions: To recover, Kick Down
needs
to be seen as OFF during detection time.
H-7
'}-1 KICK DOWN I SWITCH
I { I ? BLKJORN ~
I GROUND II C1 BLKJBLU :q ) D1 < I ____ , 1
TRANSMISSION
I
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1 r::o
CONTROL
MODULE ITCM)
•

7A-124 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 53
MODE SWITCH IN P OR N OR R BAD POSITION
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The mode switch supplies the Transmission
Control Module (TCM) with information regard­
ing
the selector lever position: P, R, N, D, 3, 2 or
L. The selector lever position is indicated by the
state
of four ON/OFF contacts. The mode switch
is located on one side of the transmission. It is
on
the transmission manual shaft and is fixed to
the main case.
• The mode switch is also used to provide the
information P or N to the engine crank wiring.
The engine can be cranked only if connector C-43
terminal 4(H) is connected to terminal 1(E), which
is connected to ground.
• The mode switch is also used to provide the back
up lamp power in reverse. This is the reason
why the mode switch is supplied through a 15A
fuse
(C-3). This fuse can burn due to short circuit
in the back up lamp.
•
When this fuse is open, the mode switch does
not work and DTC54 is set.
• The mode position is defined by the shift linkage
which is a link between the shift lever and the
mode switch. A bad adjustment of the shift link­
age can create a mode switch problem (DTC53).
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
•
Detection conditions of P or N bad position:
CD A/T Input Speed <3000 RPM
0 TPS > 20%
@ Mode Switch = P or N
® No malfunction: TPS short to voltage or
ground (DTC21, DTC22), Engine Speed
(DTC13).
® The conditions need to be present for at least
4 seconds.
• Action after the detection time: Default position
assumed for pressure calculation and shift
pattern =always in D.
• Recovery Conditions: To recover, have the
engine speed higher than 3000 RPM with a TPS
higher than 20% when the mode switch is not in
PorN.
• Detection conditions of R bad position:
CD A/T Output Speed> approx. 100 KPH
0 Mode Switch= R
@ No malfunction: Output speed (DTC11).
Downshift Protection (DTC62).
® The conditions need to be present for at least
4 seconds.
• Action aft,:H the detection time: Default position
assumed for pressure calculation and shift
pattern = always in D.
• Recovery conditions: To recover, have the output
speed hi~1her than 100 KPH when the mode
switch is not R.
'''·"'·'lllfHJi'.!d'
1
-FUSe C-3 --~ FUSE BOX 16A I I STARTER RELAY
L _____ l I
~~J~Jr'~~~ION RED/BLK BLU/RED
I "'R 2 I R 2J 'R 2 • R 2J I
I '1o N D 3 ~/ l' N D 3 '( D ; / I
:~1-_-_-_~:-~ ~ ~'~t ~-: ~"~\_-_-~-_!!;~= = = ==~-: 2(F) "[ 6(C) 7(B) BIA) 3(G) liE) "'I C-43
BACKUP ( RED/BLU. . BLU ~It
LAMP ~'"""" "'""" "' e> < INPUT RELAY I MODULE
B4 '-- - -_Q6 - - - -_27 '-- - -_Q4 C-91 4 ~ - - -_co~T~L J
r - - - - - - - - - - - - - - - - - --- -- -1 TRANsM1ss1oN
I ~~~0RL~LITCM) I TRANSMISSION CONTROL INPUTS I
~-----------------------~
•

7A-126 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 54
MODE SWITCH ILLEGAL POSITION
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Circuit Description:
• The mode switch supplies the Transmission
Control Module (TCM) with information re­
garding the
selector lever position: P, R, N, D, 3, 2
or L. The selector lever position is indicated by
the state of four ON/OFF contacts. The mode
switch is located on one side of the transmission.
It is on the transmission manual shaft and is fixed
to the main case.
• The mode switch is also used to provide the
information P or N to the engine crank wiring.
The engine can be cranked only if connector C-43
terminal 4(H) is connected to terminal 1(E), which
is connected to ground.
• The mode switch is also used to provide the back
up
lamp power in reverse. This is the reason
why the mode switch is supplied through a 15A
fuse (C-3). This fuse can burn due
to short circuit
in the back
up lamp. •
When
this fuse is open, the mode switch does
not work and DTC54 is set.
• The mode position is defined by the shift linkage
which is a link between the shift lever and the
mode switch. A bad adjustment of the shift
linkage can create a mode switch problem
(DTC53).
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD Selector Pin A and Pin B and Pin C are not
active: no position is identified then.
@ Based upon Table 1, in Park shift selector
position the code is set when Pin A is open or
shorted to ground.
@ The conditions need to be present for at least
5 seconds.
• Action after the detection time: BACKUP MODE
•
Recovery Gonditions: To recover, do an IGNITION
CYCLE.
ii!Qpi.lifiiUI@ii!ll
•

7A-128 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 55
BRAKE SWITCH SHORT TO GROUND OR OPEN
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The brake switch is a switch on the brake pedal
that is used to provide the information: brakes
are
applied. This is used by different features:
cruise control, stop
light and Transmission
Control Module (TCM).
•
The TCM uses the information (brakes applied)
mainly to release the Torque Converter Clutch
(TCC).
•
The brake switch input is constantly connected to
battery when the pedal is pressed. TCM terminal
D9 is connected to Voltage.
• The brake switch input is opened when the pedal
is released.
TCM terminal D9 is grounded.
r----
IBRAKESW I INPUT I
I I C-91 GRN/YEL H-7 I >-D9--~~~------~<
I II a
II
I GROUND I C1 I { }
I I >D1
I I
I I ._ ___ j
TRANSMISSION
CONTROL
MODULE (TCM) BLK!ORN
~-11
B~LU~q
Diagnostic
Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
CD Brake seen as applied during an acceleration
from less than 10 Km/h to more than 60 Km/h
within 6 seconds.
@ After this acceleration the vehicle speed was
higher than 60 Km/h during at least 6
seconds.
@ No Malfunction: Output Speed (DTC11 ).
Downshift Protection (DTC62).
@ The conditions need to be present for at least
5
times during an ignition cycle.
• Action after the detection time: No action but, as
the brake is seen as applied, the TCC is never
applied.
• Recovery conditions: To recover, brake has to be
released.
CRUISE CONTROL UNIT(8) RELAY
CRUISE MAIN (4)
BATTERY(+)
!'~~s:_ d B-14 ~ _ I _B-14 ~--<~~
2 L--_I 1
STOP LIGHT SW
•

7A-130 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC
TROUBLE CODE (DTC)·56
BRAKE SWITCH SHORT TO PLUS
This DTC does NOT flash the CHECK TRANS
indicator and does
NOT set the BACKUP MODE.
Circuit Description:
• The brake switch is a switch on the brake pedal
that is used to provide the information: brakes
are
applied. This is used by different features:
cruise
control, stop light and Transmission
Control Module (TCM).
•
The TCM uses the information (brakes applied)
mainly to release the Torque Converter Clutch
(TCC).
• The brake switch input is constantly connected to
battery when the pedal is pressed. TCM terminal
D9 is connected to Voltage.
•
The brake switch input is opened when the pedal
is released. TCM terminal D9 is grounded.
r----
IBRAKESW I INPUT I
I I C-91 GRN!YEL H-7 I lf~D-9--~~~------~~
I II I
I GROUND { 1 ?c1 II I >o1
I I
I I
.._ ___ J
TRANSMISSION
CONTROL
MODULE (TCM)
H-11
BLK!ORN sq
BLK!BLU ~
1
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
•
Detection conditions:
CD Brake seen as released during a deceleration
from more than 60 Km/h to less than 10 Km/h
within 6 seconds.
® Before this deceleration the car vehicle speed
was
higher than 60 Km/h during at least 6
seconds.
@ No Malfunction: Output Speed (DTC11).
Downshift Protection (DTC62).
@ The conditions need to be present for at least
5 times; during an ignition cycle.
•
Action atte~r the detection time: No action but, as
the brake is seen as released, the TCC is applied
even when the brake is applied.
•
Recovery conditions: To recover, brake has to be
released.
BATTERY(+)
,.------, d / '
GRN/YEL I /~;3 I ~-~3' I
~4 I I 1 I
STOP LIGHT <0---.Jr ~~l/ \3 1 ___ , 2/
' / ' BRAKE SW ,. .......... -----.......
CRUISE CONTROL UNIT(8) RELAY CRUISE MAIN (4)
BATTERY(+)
~~~R~s:_ d
·:.:-: ---~~~-14
2 L--_I 1
STOP LIGHT SW
•

7A-132 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 61
GEAR ERROR
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP MODE.
Circuit Description:
• The Transmission Control Module (TCM) is
calculating the slippage of the Converter and
transmission based upon the Engine Speed, the
Output Speed and the current gear ratio.
• The slippage of the converter at a high enough
engine speed is low. Then the transmission
should not slip more than a given value when
there is no shift.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
CD Engine Speed > 3500 RPM
@ Using the ratio of the current gear the
Converter Slippage is calculated based upon
the engine speed and the output speed. This
slippage must be more than:
528
RPM in 4th gear
536 RPM in 3rd gear
556 RPM in 2nd gear
595 RPM in 1st gear
@ No malfunction: Engine Speed (DTC13).
Output Speed (DTC11 ). Downshift Protection
(DTC62).
@ The last change of shift solenoid was more
than 3 seconds ago.
® The conditions need to be present for at least
5.5 seconds.
• Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
NOTE:
The TCC slip data is a calculated value, and not an
accurate one.
This value should be used to see if the TCC is
engaged or not.
•

7A-134 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 62
DOWNSHIFT PROTECTION
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
• The output speed information is used to
determine if the transmission has to upshift or
downshift.
• If this information suddenly changes due to an
open circuit or some electrical interference the
transmission
would downshift.
• To avoid this the Transmission Control Module
(TCM) is constantly checking the variations of the
Output Speed. If this variation is too great (too
much decrease
or increase) DTC62 is set. This
variation is taken into
amount only when the
output speed is more than : 90 KPH.
• The transmission output speed sensor provides
information on vehicle speed to the TCM. The
speed sensor circuit consists
of a magnetic
induction
type sensor. The sensor is mounted
above a target wheel pressed on the output shaft
in the transmission extension. As the
output
shaft turns, the target wheel teeth induce a
TRANSMISSION SPEED SENSOR SHIELDS
variable voltage in the magnetic pickup. This
alternating current (AC) signal is provided to the
TCM. The
voltage increases with the speed of
the wheel but this is not used to define the speed
of the vehicle. As the vehicle moves faster, the
signal alternates faster between positive and
negative
voltages. The Output speed information
is proportiional to the frequency of the signal.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
G) Variation of Output Speed >16 KPH/0.025s.
@ Ignition ON more than 5 seconds.
@ Mode Switch not in P, N or R.
@ Last Output Speed > 90 KPH.
@ The conditions need to be present for at least
0.1 second.
• Action after the detection time: BACKUP MODE.
•
Recovery Gonditions: To recover, do an IGNITION
CYCLE.
- - - -C-90 / " I ,---:-"'\. '-. ~---+I WHT I I I I ~-10 I 'I I 'I M-1
5 r - - - - - - -TRANSMISSION ) f I SPEED SENSOR I . I f A 12 I I I I ~ I I I I
I II I I I I I I I I I
I II I I I I 1 I I
~~~~rie II I Ill I I
IINPUT II I I I I
1 1 1 I l I I I I -? ORN I I < I I
I l: ):~~ BLK \~ __ ~~ __ ~
I GROUNO I C-91 BLK/ORN H-11
I I I C1 BLK/BLU ~ 9_ I ____ I D1
TRANSMISSION
CONTROL MODULE (TCM)
2 I I (EXTENSION)
: : .·(C},h.·.. ,.·, .. ·.,· .. : HOUSING
II II ·<;',~ . I
I I . 'I ' . . I
I I I
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•

AUTOMATIC TRANSMISSION (4L30-E) 7A-137
DIAGNOSTIC TROUBLE CODE (DTC) 63
EPROM CSUM FAILURE
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The Erasable Programmable Read Only Memory
(EPROM) is an electronic circuit that contains the
commands that control the Transmission Control
Module (TCM).
•
The EPROM content is checked automatically
approx. each second by the TCM. This is called
Check
Sum (CSUM) calculation. If this CSUM is
false
this means that one command is altered.
• This can be due to a circuit failure or a bad
contact between the EPROM and
the TCM and
the
DTC63 will be set.
• If all EPROM connections are bad, the TCM does
not work. The CSUM can not be calculated and
detected.
Nothing works, not even the CHECK
TRANS
indicator.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
G) Bad EPROM Check Sum.
@ The condition needs to be present for at least
approx. 1 second.
• Action after the detection time: BACKUP MODE.
• Recovery conditions: To recover, do an IGNITION
CYCLE.
To Solve the Problem
• Check the EPROM MEM-CAL connector.
• If condition still exists, replace MEM-CAL.

7A-138 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 82
SHIFT OR BAND APPLY SOLENOIDS FAULTY DURING DRIVING
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The shift solenoids are simple ON/OFF solenoids
located in the main case valve body. The
solenoids are
normally closed or open-type.
Depending
on gear the Transmission Control
Module (TCM) controls the solenoids to open or
close a fluid inlet port. When the port is open,
fluid pressure actuates the shift valve.
• The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a
ground to the other
side (low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the
supply voltage. The High side of the solenoid
is
permanently supplied with voltage, except in
BACKUP
MODE or when Ignition is OFF the High
Side Driver is turned
OFF.
• The Low Side Driver (LSD) is a circuit of the TCM
that acts as a switch between the solenoid and
ground. When the solenoid is commanded ON
the TCM is switching the solenoid to ground. The
TCM
continually monitors each solenoid
connection
to its Low Side Driver and to its High
Side Driver
for either low or high voltage.
• DTC82 is activated when the Shift High Side
Driver
or one of the Shift Low Side Drivers
senses a
short circuit or open circuit when the
engine is cranked, then when the car is driven.
DTC82 can be set
only when the TCM is
activating the solenoids in
with the problem
circuit.
• To know where the fault comes from, do
IGNITION CYCLE to use the TCM self-check of
solenoids when Engine is not cranked but
Ignition ON.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD HSD or LSD is improperly ON.
@ The condition needs to be present for at least
0.15 sec:ond.
•
Action after the detection time: BACKUP MODE
•
Recovery conditions: To recover, do after
IGNITION CYCLE.
•

7A-142 AUTOMATIC TRANSMISSION (4l30-E)
TRANSMISSION OPERATING MODE TEST
Circuit
Description:
The Transmission Control Module (TCM) can
controls 4L30-E operation in three modes: Power
mode, Normal mode, and Winter mode. The driver
determines the transmission operating mode
through the Power/Normal mode switch and the
Winter mode switch.
The
Power mode provides better part-throttle ac­
celeration
by delaying part-throttle upshifts.
In Winter mode, the transmission starts in third
gear to reduce tire slippage on ice and snow. When
the driver selects Winter mode, the TCM overrides
the
Power or Normal mode. The TCM will enter
Winter mode only when all of the following
conditions are met:
• Selector lever in D range.
• Vehicle speed 7 mph ( 11 km/h) or less.
•
Transmission oil temperature 120°C (248°F) or
less.
•
Throttle opening 8% or less.
•
Kick-down switch is off.
Winter mode will be canceled if any of the following
conditions are met:
• Driver depresses Winter mode switch again.
• Driver moves selector lever to 3,2 or L (TCM will
stay in Winter mode if lever is moved from D to N
orR or P).
• Ignition switch is turned off.
• Vehicle speed is 21 mph (34 km/h) or more for
longer than one second.
• Transmission oil temperature is greater than
140°C (284·°F).
• Kickdown switch is "ON" for more than 3
seconds.
When Winter mode is canceled, the TCM returns
the transmission
to Normal mode.
HOT IN ON OR START H-9 PNK/GRN
.«19 u
'1----~ FUSEBOX C-10 I 7.5A I
I
____ J
H-25 v 10
lBLUIYEL
14 1-9
r--- - - --AUTOMATIC
I
I I TRANSMISSION
WARNING/
I INDICATOR I ASSEMBLY (METER)
I
I WINTER MODE _INOICATORJ
GRY/WHT
«~13~-BL-K/~G-R-N----]
89 - - -~ 11 C-90
I~POW'ERMOOE-WiNTER MODE 1 TRANSMISSION
INDICATOR INDICATOR I CONTROL I CONTROL CONTROL MODULE !TCMI
I POWER MODE WINTER MODE I _gN~~L[.!NPUT-E!:::J£-BLE INPUl.. I
88 r ----86 rC-90 VIO/RED VIO/GRN 7 16 H-7
3 t ----~ 1 B-30
--\~~~--:~~~~NTER
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•