transmission ISUZU TROOPER 1995 Workshop Manual

7A-116 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 44
BAND APPLY SOLENOID SHORT TO PLUS
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Circuit Description:
• The band apply solenoid is a normally open
solenoid which controls the flow of fluid for brake
band
application. The Transmission Control
Module (TCM) uses Pulse Width Modulation
(PWM) and changes the duty cycle to control the
solenoid. The TCM turns the solenoid ON
(energized) and OFF (de-energized) at a constant
frequency. The
length of time the solenoid is
energized
during each ON/OFF cycle is called the
pulse width. By varying or "modulating" the
pulse width, the solenoid output pressure is
changed.
Since the solenoid is normally closed,
increasing the pulse width increases the duty
cycle and decreases the output pressure. PWM
control provides smooth band application
without an accumulator. The band is only applied
in first and second gears.
• In the event of an electrical failure (open), the
solenoid regulates at the maximum oil flow (0%
duty cycle).
•
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 HSD
H-7
is turned OFF.
• The TCM continually monitors the solenoid
connection to its Low Side Driver (LSD) for either
low or high voltage. The 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.
• There are two tests of the LSD: when the engine
is cranked (DTC82) and
when the ignition is
turned
ON (DTC44).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the
shift
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set
to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end
of all tests, the remaining tests are not done.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD The solenoid Low side connected to TCM
termin.al A9 is shorted to voltage.
@ The test is only done when ignition is ON.
@ Engine Speed < 480 RPM (not cranked) and
Output
Speed = 0 RPM.
@ The condition needs to be present for 0.15 to
1.18 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
,... BATTERY-, C-90
I INPUT I? A4 GRN/WHT ·~-----BATTERY
( 4
I IGNITION I ? I INPUT A7 II
I { I? AS I GROUND I ? A3
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I A2
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I BANDAPPLY C-91 SOLENOID I 1 _:oNTROL _ 1
TRANSMISSION
CONTROL MODULE (TCMI
C12
RED/GRN
BRN/YEL
BRN/BLK
BRN/RED
BRN/WHT
H-42 •--::------ECM MAIN RELAY )) 8 H-10
«--------3-(D--,I'l----- --'~L -,,,l M-7
( 12
2:j
16 r-- -r ----r ----
1-- --
AUTOMATIC I
I TRANSMISSION
: H::Q]:;& : I OLE SOlENOID I
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1-213-4 2-:
-II
SHIFT
II
s SOLE NOlO s
-"--------_______ .J
H-10 ( 10
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-117
DIAGNOSTIC TROUBLE CODE (DTC) 44
BAND APPLY SOLENOID SHORT TO PLUS
• Ignition switch OFF.
• Disconnect Transmission Control Module (TCM)
connectors C-90 and C-91.
• Connect ohmmeter between connector C-90 terminals A9 and A7 ITCM ignition) then between A9
and A4 (TCM battery) then between A9 and C12. IF: Short circuit:
• Check for faulty connector or wiring between terminal A9 and the shorted terminal. Repair.
• Connect ohmmeter between A9 and A2 then
between A9 and A3.
IF: Short circuit:
The
problem is intermittent.
GOTO INTERMnTENT CONDinONS.

7A-118 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 46
SHIFT HIGH SHORT TO PLUS
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The solenoids are 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
Transmission Control Module (TCM) that acts as
a
switch between the solenoids and the supply
voltage. The High side of the solenoid is per­
manently supplied with voltage, except in
BACKUP
MODE or when ignition is OFF the High
Side
Driver is turned OFF.
•
The TCM continually monitors the solenoid
connection to its High Side Driver for either low
or high voltage.
•
There are two tests of the HSD: when the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC46).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
H-7
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end of all tests, the remaining tests are not done.
Diagnostic Aids:
• This diagnostic is an electrical test done by the
TCM.
•
Detection conditions:
CD The solenoid High side connected to TCM
terminal C12 is shorted to voltage.
@ The test is only done when ignition is ON.
@ EnginE! Speed < 480 RPM (not cranked) and
Output Speed = 0 RPM.
® The condition needs to be present for 0.15 to
1.34 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
,.. BATTERY-1 C-90
JNPUT ( A4 GRN/WHT ( 4
IGNJTION I RED/GRN H-42
INPUT ( A7 »a BRN/YEL H-10
-:::------ECM MAIN RELAY
G~UND {
I A9 12 I BRN/BLK
2
A2 ( 16 r-----'----<~----3(-D~,J,----"~L-218.1 M-1
SHIFT& BAND APPLY C-91 SOLENOID I ~ONTROL _I C12
TRANSMISSION CONTROL MODULE (TCM) BRN/WHT
H-10 ( 10
H/3-4
2·3
II
SHIFT
II
SHIFT
II SOLENOID SOLENOID
:--r----r----1---: ~~~~;ION
BAND I
I APPLY I SOLENOID I
~ I I
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-'--------------.J
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-119
DIAGNOSTIC TROUBLE CODE (DTC) 46
SHIFT HIGH SHORT TO PLUS
• Ignition switch OFF .
• Disconnect Transmission Control Module (TCM) connectors C-90 and C-91.
• Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A7 (TCM ignition)
then between C12 and A4 (TCM battery). IF: Short circuit:
I
$ $
• Check for faulty connector or wiring between I The problem is intermittent. J terminal C12 and the shorted terminal.
GOTO INTERMITTENT CONDITIONS. Repair.

7A-120 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC
TROUBLE CODE (DTC) 51
ENGINE COOLANT SWITCH SHORT TO GROUND, PLUS OR OPEN
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The Engine Coolant Temperature is measured by
a sensor in the coolant system. This information
is used by the Engine Control Module (ECM) for
the engine. The ECM provides the information:
Engine Warm to the Transmission Control
Module (TCM) when the ECM measures a
temperature
higher than 70°C (158°F).
• The information is provided using a wire
between the ECM terminal A9 and the TCM
terminal D14. When the engine is warm the ECM
connects its terminal A9 to ground using a Low
Side Driver. When the engine is Cold the ECM
lets this wire open and the TCM pulls it up to 5
volts.
•
When Ignition is ON and Engine is OFF: the ECM
always sends the information "engine cold" even
if the engine is warm. The information is valid
only when the engine is ON.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions of engine always cold:
CD Engine! seen as cold: wire short to voltage or
open.
@ Transmission Oil Temperature >150°C (302°F)
or more than 20 minutes since last ignition
cycle.
@ Detection conditions need to be present for at
least 25 seconds.
• Detection conditions of engine always warm:
CD Engine! seen as warm: wire short to ground.
@ Transmission Oil Temperature< ooc (32°F).
@ Without problem on Transmission Tem­
perature sensor then:
voltage on AfT Oil
Temperature sensor <4.74 V.
@ Detection conditions need to be present for at
least 6 seconds.
• Action after the detection time: No action.
• Recovery conditions: To recover, Engine Coolant
Temperature change information need to be
present
for more than 6 seconds.
r - - - -C·91 BRN C-1 r - - - -
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~---J ~---J TRANSMISSION ENGINE
CONTROL CONTROL
MODULE
(TCM) MODULE (ECM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-121
DIAGNOSTIC TROUBLE CODE (DTC) 51
ENGINE COOLANT SWITCH SHORT TO GROUND, PLUS OR OPEN
• This DTC can be set when there is no problem at
all. This is due to the fact that when the engine
stalls the ignition is still ON then Engine Control
Module (ECM) provides a false information:
engine cold. The Transmission Control Module
(TCM), knowing that the last ignition cycle
happened more than 20 minutes ago, then sets
DTC51.
• Check voltage between connector C-91 terminal 014 and connector C-91 terminal C1 (TCM ground). • Ignition switch ON. Engine ON. Engine warm. IF: Voltage higher than 5 volts:
•
There is a short circuit to voltage.
•
Repair.
• Using the Scan Tool you can check with TECH1:
FO: ENG. TEMP. SW information. When the
engine is
cold or when the engine is OFF the
TECH1 should show: COLD. When the engine is
warm the TECH1 should show WARM.
• This DTC is not very important. In the worst case
it would not allow the Torque Converter Clutch
(TCC) to be applied. This will cause low fuel
economy.
There is not currently a problem. GOTO INTERMITTENT CONDITIONS.
• This is an open circuit or the ECM is not sending the correct information. See also ECM information, SeetiQR 6E.
• Voltage approx. 0 volts means that the signal is OK or that
there is a short circuit to ground. • Repair.
There is
not currently a problem. GOTO INTERMITTENT CONDITIONS.
• Turn the engine OFF with the ignition ON. IF: The voltage goes back to 5
volts:
•
As the voltage is staying at 0 volts, there is a short to ground. • Repair.

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
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----
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 ~
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TRANSMISSION
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CONTROL
MODULE ITCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-123
DIAGNOSTIC TROUBLE CODE (DTC) 52
KICK DOWN ALWAYS ON OR SHORT TO GROUND
IF: DTC 23 Throttle Position Sensor (TPS) connector
• Ignition switch ON. Engine OFF.
• Accelerator pedal not depressed. • Connect a voltmeter between connector C-90
terminal B5 and connector C-91 terminal C1 (TCM
ground).
IF: Display approx. 0 volts:
•
Check the wires and connector
and the switch to detect the
short to ground.
• Repair. The
problem is
intermittent. GOTO INTERMITTENT
CONDITIONS.

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
~-----------------------~
•

AUTOMATIC TRANSMISSION (4l30-E) 7 A-125
DIAGNOSTIC TROUBLE CODE (DTC) 53
MODE SWITCH IN P OR N OR R BAD POSITION
IF: DTC 23 Throttle Position Sensor (TPS) connector
open or DTC 13 Engine speed, DTC 54 Mode switch
illegal position exists:
Table 1
TECH1 DISPLAY p
SELECTOR PIN A X
SELECTOR PIN B
SELECTOR PIN C
SELECTOR PIN P X
• Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON. Engine running.
• Selector lever position "P". • Select FO: DATALIST: "TOP SIGNAL" or FO: DATA LIST: "AT INPUT SPEED".
IF: Display does not change with engine speed or TPS:
DTC 23 or DTC 13 not detected
but are the reason for this DTC 53.
GOTO DTC13 or DTC23.
R
X
X
The problem is
intermittent. GOTO
INTERMITTENT
CONDITIONS.
SHIFT
SELECTOR POSITION
N D
3
X
X X X
X
X
X X
2 L
X
X X
X
• Ignition switch ON.
• Select FO: DATALIST: "SELECTOR POS.".
• Move shift selector lever through all positions
and compare
results with table 1. IF: all selector pin displays correct:
• Check automatic transmission mode switch
adjustment. GOTHROUGH MODE SWITCH
SETTING PROCEDURE (~. ;"A•1~'Yl
• Repair.
Note:
"X" indicatesTECH1 displays "ACTIVE".