automatic transmission ISUZU TROOPER 1995 Workshop Manual

7A-114 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 43
TCC HIGH SHORT TO GROUND
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The Torque Converter Clutch (TCC) solenoid is a
simple ON/OFF solenoid connected to the
adapter case
valve body. When the solenoid is
energized
by the Transmission Control Module
(TCM), it opens a fluid port. When the port is
open,
line pressure actuates the converter clutch
control valve
which engages the torque converter
clutch by exhausting the fluid. The TCM engages
the
torque converter clutch only when all of the
following conditions exist:
G) The transmission is at operating temperature.
@ The brake pedal is released.
® The transmission is operating in second, third
or fourth gear.
® The engine is warm (more than 70°C).
@ The shift pattern requests TCC apply.
® Shift finished.
(f) No malfunction which will disable the TCC:
DTC33, DTC55 (only short to ground).
• 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 solenoid and
the supply voltage. The High side of the TCC
solenoid is used to turn the TCC ON or OFF
because the Low side is permanently connected
to the ground of the transmission. In BACKUP
MODE or when ignition OFF the TCC High Side is
turned OFIF.
• The TCM continually monitors the solenoid
connection of to its High Side Driver for either
low or high voltage.
• There is only one test of the HSD for TCC: when
the engine is cranked and the TCC is turned ON.
Diagnostic .Aids:
• This diagnostic is an electrical test done by the
TCM.
• Detection conditions:
G) The solenoid High side connected to TCM
terminal C7 is shorted to ground.
@ The condition needs to be present for 0.07
seconds after ignition switch ON.
•
Action after the detection time: TCC is turned
OFF.
• Recovery eonditions: To recover, do an IGNITION
CYCLE.
r - - --, C-S1 BRN/BLU H-10 TORQUE I >-----__:_---<1 ~ ~'---------4-(A~) \1, M-6
g~~i~~TER I C7 II --1-- -- ---, AUTOMATIC
SOLENOID 1 TRANSMISSION
I
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CONTROL
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I {I? GROUND I I C1 )
l---~ 01
TRANSMISSION CONTROL
MODULE (TCM)
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TORQUE CONVE:RTER CLUTCH
SOLEt\A0
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-=-,5 BLK/BLU (
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•

AUTOMATIC TRANSMISSION (4L30•E) 7A-115
IF you have a SCAN TOOL: TECH1?
$
DIAGNOSTIC TROUBLE CODE (OTC) 43
TCC HIGH SHORT TO GROUND
$
• Install scan tool: TECH1 GOTHROUGH TECH1 CONNECTION . I Without TECH1 you can not do preliminary test.
While driving the car in 2nd, 3rd or 4th gear check if the TCC is slipping or not when the TCC solenoid is commanded ON by the TCM.
Push FO: DATA LIST:
I Read TCC state and SLIP value.
CASE: SLIP
> 20 RPM with I CASE: DTC 33
I TCC =ON GOTO DTC33.
This means that the TCC valve is stuck OFF or the TCC solenoid connections are shorted to ground.
SHORT TO GROUND?
• Ignition switch OFF. Engine OFF .
• Disconnect Transmission Control Module ITCM) connectors C-90 and C-91.
• Connect a ohmmeter between connector C-91 terminal C7 and car ground or with TCM ground terminal C1.
IF: Short circuit:
~ $
The TCC is shorted to ground. I The problem is intermittent.
I GOTO INTERMITTENT CONDITIONS.
• Check wiring between terminal C7 and ground.
• Repair .
TCC: Torque Converter Clutch
TCM: Transmission Control Module
I

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 SHIFT& I
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
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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
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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
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•

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
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
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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.