automatic transmission ISUZU TROOPER 1995 Workshop Manual

7 A-94 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 31
SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The 1-2/3-4 solenoid is a simple ON/OFF solenoid
located
in the main case valve body. The
solenoid is the normally closed-type. In second
or third gear the Transmission Control Module
(TCM) energizes the solenoid to open 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 HSD
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.
r----C-90 BRN/RED H-10
• There are two tests of the LSD: When the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC31 ).
• 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
terminal A2 is shorted to ground or open.
® The test is only done when ignition is ON.
® Engine Speed < 480 RPM (not cranked) and
Output Speed = 0 RPM.
@ The conditions need to be present for 0.15 to
1.03 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
I GROUND I A2 3(D)j,. M-7 ( 16
I I
I I
I I
I
I
I
I 1·2/3·4
SHIFT C-91
I SOLENOID I j> BRN/WHT
I
CONTROL I I C12
I GROUND { I ? C1
BLK/ORN
J ) BLK/BLU
L..---D1 TRANSMISSION
CONTROL MODULE
(TCM)
H-10 ( 10
~ --r ----r ----1----~ ~~~~~~~~ION
I I
1m4 rnH SHIFT SHIFT II SOLENOID II SOLENOID
-y
-_........_ __________
--41Clf M-7
II
SAND I APPLY SOLENOID I
I
I
---.J
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-95
DIAGNOSTIC TROUBLE CODE (DTC) 31
SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module (TCM) connector C-90 and C-91.
•
Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A2. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A2 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A2
and ground.
• Repair.
The
problem is intermittent. GOTO INTERMITTENT CONDmONS.
Check for an open circuit between connector C-90 terminal A2 and connector C-91 terminal C12.
IF: Wiring problem?
I Repair.
• Disconnect 1-2/3-4 solenoid connector. • IF: Ohmmeter displays between 17.5 and 18.5
ohms on the 1-2/3-4
solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.

7 A-96 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 32
SOLENOID 2-3 SHORT TO GROUND OR OPEN
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The 2-3 solenoid is a simple ON/OFF solenoid
located in the main case valve body. The
solenoid is the normally open-type. When the
port is open, fluid pressure actuates the shift
valve. In first or second gear the Transmission
Control Module (TCM) energizes the solenoid to
close a fluid inlet port.
• 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
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.
r---_ c-9o
BRN/BLK H-10
I GROUNDJ) (( A3 2
• There are two tests of the LSD: When the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC32).
• 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
terminal A3 is shorted to ground or open.
@ The test is only done when ignition is ON.
@ Engine Speed < 480 RPM (not cranked) and
Output Speed = 0 RPM.
@ The conditions need to be present for 0.15 to
0.88 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
1(A) '1 M-7
,.... --r ----r ----
1 - -- -
AUTOMATIC I
I TRANSMISSION
I I
I I
I I
I BAND I APPLY I SOLENOID!
I
I
I I
I
I
I
I
I I
I I
I 2·3 I SHIFT C-91 H-10
I SOLENOID I
( BRN/WHT (
I
CONTROl I I C12 10
I GROUND { I ? C1
BLK/ORN
j) BLK/BLU L.---D1
1-2/3-4 2-3
II
SHIFT
II
SHIFT
II SOLENOID SOLENOID
-"--------------..J
TRANSMISSION
CONTROL
MODULE (TCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-97
DIAGNOSTIC TROUBLE CODE (DTC) 32
SOLENOID 2-3 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module
(TCM) connector C-90 and C-91.
• Connect
ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A3. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A3 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A3
and ground.
Repair.
The
problem is intermittent. GOTO INTERMITTENT
CONDITIONS.
Check for an open circuit between connector C-90 terminal A3 and connector C-91 terminal C1.
IF: Wiring problem?
•
Disconnect 2-3 solenoid connector. IF: Ohmmeter displays between 17.5 and 18.5 ohms on the 2-3 solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.

7 A-98 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 33
TCC HIGH SHORT TO PLUS OR OPEN
This DTC flashes 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.
(]) No malfunction which will disable the TCC:
DTC43, 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 is turned OFF the TCC
High Side is
turned OFF.
• The TCM continually monitors the solenoid
connection 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 OFF.
•
If this circuit is shorted to plus, the TCC solenoid
is constantly commanded ON (shifts can be firm).
In 1st gear the TCC is hydraulically OFF, whatever
the TCC solenoid position. This means that the
car can be driven even with the TCC shorted to
voltage. The engine could stall when the driver is
braking strongly, if the car is stopped when the
transmission is still in second gear with TCC
applied. Note: The 3-2
shifts are very firm.
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 voltage or open.
® The condition needs to be present for 0.13
second.
• Action after the detection time:
G) TCC is turned OFF.
® CHECK TRANS indicator turned ON.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
I - - - -C-91 BRN/BLU H-10
TOFlQU!;
I ? (( 4(A) J., M-6
I Cot!M:R'teR I I c7 15 I --1· -.-- - - ---. AUTOMATIC .. CLU'IrlilH I I S~NOib I I I TRANSMISSION
leoti~~~~ I . I I T()ftotJE
I I I I II CoHVEMER I I ' CLUTCH I I I I SQLENOID I
I 1: I I
I II I I I
I I H-11 - --!._-- - - - - -
{ I
{
BLK/ORN ~
9
-=-
1 GROUND I I C1 BLK/BLU : 5
1_--_,) 01 ( 1
TRANSMISSION
CONTROL MODULE (TCM)
•

IF you have a SCAN TOOL: TECH1?
L
$
AUTOMATIC TRANSMISSION (4L30-E) 7 A-99
DIAGNOSTIC TROUBLE CODE (OTC) 33
TCC HIGH SHORT TO PLUS OR OPEN
$
• Install scan tool: TECH1 GOTHROUGH TECH1 CONNECTION. I I Without TECH1 you can not do preliminary test.
l
While driving the car in 2nd, 3rd or 4th gear check if the TCC is
slipping or not when the TCC solenoid is commanded OFF or ON by the TCM.
I
Push FO: DATA LIST:
I Read TCC state and SLIP value.
l I I
CASE: SLIP > 20 RPM with CASE: SLIP= 0+ OR -10 RPM I CASE: DTC43
I TCC =ON with TCC = OFF at any TPS: GOTO DTC43
I
This means that the TCC valve This means that the TCC valve
is stuck OFF or the TCC is stuck ON or TCC solenoid is
solenoid connections are shorted to plus.
OPEN.
I SHORT TO PLUS? SHORT TO PLUS?
A
• Ignition switch ON. Engine OFF. • Ignition switch ON. Engine OFF.
CONTINUED ON • Connect a voltmeter between • Connect a voltmeter between
NEXT~ connector C-91 terminal C7 and car connector C-91 terminal C7 and car
ground or with TCM ground terminal ground or with TCM ground terminal C1. C1. IF: voltage found: IF: voltage found:
~
YES
$ s
I GOTO TCM MEM-CAL REPLACEMENT. I I The TCC is shorted to voltage. I A CONTINUED ON
Check
wire for a short to voltage between NEXT eAG"E • terminal C7 and solenoid. Note:
This short can be to another wire of the
adapter case connector M-6.
In this case the problem occurs only when voltage is present at the second wire.
• Repair .
TCC: Torque Converter Clutch
TCM: Transmission Control Module

7A-100 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (OTC) 33
TCC HIGH SHORT TO PLUS OR OPEN
(CONTINUED)
CONTINUED FR~
PREVIOUS~E A
I
OPEN?
• Ignition switch OFF.
• Disconnect TCM connector C-90 and C-91.
• Connect ohmmeter between connector C-91 terminal C7 and C1 (TCM ground).
IF: Display is between 17.5 and 18.5 ohms.
• Disconnect transmission adapter case connector M-6. • Connect ohmmeter between terminal 4(A) of female half of
connector and transmission which is used as ground. IF: Display between 17.5 and 18.5 ohms:
• Wire between connector C-91 terminal C7 and
adapter case connector is open or shorted to another wire.
• Repair.
• Wire between adapter case connector and solenoid is open. • Or wire between transmission (ground) and
solenoid is open. • Repair.
TCC: Torque Converter Clutch TCM: Transmission Control Module •
Disconnect solenoid connector. • Connect ohmmeter between
the two solenoid
terminals.
IF: Display is between 17.5 and 18.5 ohms.
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-101
MEMO

7A-102 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE
(DTC) 34
BAND APPLY SOLENOID SHORT TO GROUND OR OPEN
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
2{8)\l, M-7
r----C-90 BRN/YEL H-10 ( 12
is turned OFF.
• The TCM continually monitors the splenoid
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 (DTC34).
• 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
terminal A9 is shorted to ground or open.
@ 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
0.75 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
: --r ----r ----
1-
- -: ~Z[;'~,~~ION
I 1'•1 ~~ If ~!FT . i '· !: J GROUND A9
I
I
I
1 ·. SOI:!Noto· R sOLI!lQI,~, . ~ , ~. sOt.ENOiti•J
I ,Ji'Ji ·
· I
I •• ) . I
--~~---------~---~ >--------< I
I
I I
BAND APPLY C-91 BRNtWHT H-10
I SOLENOID ( CONTROL : C12 10
I .
: GROUND {
. BLK/ORN . ; C1 BLK/BLU :> 01 ..... ---J
H-11
TRANSMISSION
CONTROL
MODULE (TCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-103
DIAGNOSTIC TROUBLE CODE (DTC) 34
BAND APPLY SOLENOID SHORT TO GROUND OR OPEN
• Ignition switch off. • Disconnect Transmission Control Module (TCM) connector C-90 and C-91
• Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A9. IF: Display is approx. 10 ohms:
• Connect ohmmeter between connector C-90 terminal A9 and connector C-91 terminal C1 (TCM ground)
IF: Short circuit:
• Check for faulty connector or wiring
between terminal A9
and ground.
• Repair.
The
problem is intermittent.
GOTO INTERMITTENT
CONDITIONS.
• Check for an open circuit between
connector C-90 terminal A9 and
connector
C-91 terminal C12. IF: Wiring problem?
•
Disconnect band apply solenoid connector. IF: Ohmmeter displays approx. 10
ohms on the band apply solenoid terminals:
The
problem is intermittent.
GOTO INTERMmENT CONDITIONS.