automatic transmission ISUZU TROOPER 1995 Workshop Manual

7A-104 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC} 35
FORCE MOTOR OPEN OR SHORT TO PLUS OR GROUND
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
• The force motor solenoid is a device used to
regulate transmission line pressure. The TCM
uses
TPS information and vehicle speed infor­
mation to determine the line pressure appro­
priate
for a given load. The TCM will regulate the
pressure
by applying a varying amperage to the
force
motor solenoid. The applied amperage can
vary from 0.1 to 1.1 amp. The TCM then
monitors the amperage at the return line. If the
return amperage is
more than 0.2 amp from the
commanded amperage, the DTC is stored.
• The line pressure can vary from less than 50psi to
more than 200 psi. The line pressure varies
inversely
to the amount of current. High current
causes
low pressure and low current causes high
pressure.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
• The TCM monitors the amperage at the return
line. When the return amperage is
more than 0.2
amp from the commanded amperage, DTC is
stored.
• Action after the detection time: BACKUP MODE
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
----1 C-90 I IGNITION I >----R_ED_..:./G..:...R_N_4H'>--4
-2----4 ECM MAIN RELAY I INPUT A7
8
I I C-91 H-10 I VIO;WHT >~----'-----~<~<------~ I FORCE I I -C15 4
2(6) l M-6
MOTOR I--1------...., AUTOMATIC I SOLENOID I I T s ON
CONTROL I I RAN MISSI
I I+J Jl I I I FORCE
I : : til: :g~~H> :
I II I
I FORCE II I
I
MOTOR I I I - --- - --- - -SOLENOID HEJ t M-6 I CONTROL I I VIO/RED H-10 I f-) >·-----------(<(~------~ I l : C16 13 BLK/ORN H-11 1 {'f~c-1-=~~----~~.·~
1
I GAOUNO I >-1 __ ___cB:..:l::.c:K/c.::.B=..:LU:..__ ________ -<
I 01
----' TRANSMISSION
CONTROL
MODULE
(TCM)
•

AUTOMATIC TRANSMISSION (4l30-E) 7A-105
DIAGNOSTIC
TROUBLE CODE (DTC) 35
FORCE MOTOR OPEN OR SHORT TO PLUS OR GROUND
• Ignition switch off.
• Disconnect Transmission Control Module (TCM) connector C-90 and C-91
• Connect ohmmeter between connector C-91 terminals C15 and C16. IF: Display is between 3.7 and 4.7 ohms:
• Connect ohmmeter between connector C-91 terminals C15 and C1 {TCM ground) then between
terminal C15 and connecter C-90 terminal A7 (TCM ignition) then between terminals C16 and C1 (TCM ground) then between terminals C16 and A7 (TCM ignition).
IF: Display indicates a short circuit:
The
problem is
intermittent. GOTO INTERMITIENT
CONDITIONS.
• Disconnect automatic transmission adapter case
connector M-6.
• Connect ohmmeter between terminals 2(8) and 1(E)
of female half of the connector (solenoid side). IF: Display between 3.7 and 4.7 ohms:
Repair wires
for open between terminals C15 or C16 and adapter
case connector M-6.
• Disconnect solenoid connector. • Connect ohmmeter between solenoid
terminals.
IF: Display between 3.7 and 4.7 ohms:
Repair wires
for open
between adapter case
connector and
solenoid connector.
Replace force motor solenoid.

7A-106 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 36
SHIFT HIGH SHORT TO GROUND OR OPEN
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
permanently 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 (DTC36).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the
shift
BRN/YEL H-10 (
BRN/BLK 12 I
BRN/RED ;: ( 16
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 seconds. 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 ground or open.
@ The test is only done when ignition is ON.
@ Engine1 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 Gonditions: To recover, do an IGNITION
CYCLE.
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-107
DIAGNOSTIC TROUBLE CODE (DTC) 36
SHIFT HIGH SHORT TO GROUND OR OPEN
• 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 A2 and between
C12 and A3 and between C12 and A9. IF: Display is approx. 10 ohms for the band apply and 18 ohms for the other solenoids:
I
$ $
• Connect ohmmeter between connector C-91 terminal • Check for an open circuit between connector
C12 and C1 (TCM ground). C-91 terminal C12 and the other terminals A2,
IF: Short circuit: A3
and A9.
I IF: Wiring problem?
I
$ 8
$ $ • Check for faulty connector or wiring between terminal C12 I Repair. I The problem is
and ground. intermittent.
• Repair
. GOTO INTERMmENT
CONDITIONS.
I The problem is intermittent. GOTO INTERMITTENT CONDITIONS.

7A-108 AUTOMATIC TRANSMISSION (4l30·E)
DIAGNOSTIC TROUBLE CODE (DTC) 37
TORQUE MANAGEMENT SERIAL LINE FAULTY
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
• Torque Management is a function that decreases
the engine
torque during transmission shifts. To
do so the Transmission Control Module (TCM)
exchanges
information on a wire with the Engine
Control Module (ECM) that governs the Engine.
This
wire is the Data Link Connector which is also
used by the Scan tool to communicate with the
TCM and the ECM.
r----
I I
I I
I I
I ,_
I C-91
I SERIAL DATA I RED
ca
I I '-._....;
Diagnostic .Aids:
• This
Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
•
Detection conditions:
CD Torque~ control failure detected
® Each time a shift occurs with the Torque
Management active, the TCM sends a
message
to the ECM. If the ECM does not
acknowledge this message, the DTC is stored.
• Action after the detection time: BACKUP MODE
• Recovery Gonditions: To recover, do an IGNITION
CYCLE.
NOTE:
CD When connecting the TECH1 to the data link
connector, be sure to turn off the ignition
switch.
® Since the torque management exchanges
information between the TCM and the ECM at
all times, the DTC37 is sometimes detects in the
following condition.
However,
this is not an abnormal condition.
• When the engine stops while driving and then
it is restarted.
• When the battery voltage goes down
excessively and the engine does not start
again.
When DTC37 is detected in the above
conditions,
turn off the ignition switch, correct
the
abnormal condition and erase the trouble
code.
II L
C-2 ~--I
r I ---- ----<+tC2 I
I I I '-" t
I I II' BLK/BLU
LT GRN/BLU (~ C
4 I
I I
r I I
I
I
I 3 I 2 I 1 I
---I ENGINE
... ---J CONTROL
MODULE
TRANSMISSION
DATA LINK CONNECTOR (C:-9) (ECM) CONTROL
MODULE (TCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-109
DIAGNOSTIC
TROUBLE CODE (DTC) 37
TORQUE MANAGEMENT SERIAL LINE FAULTY
• Peform TECH1 SELF-TEST GOTHROUGH TECH1 CONNECTION. IF: TECH1 OK:
• Ignition switch OFF. • Disconnect TECH1.
• Connect ohmmeter between connector C-9 terminal 3
and ground.
IF: Display approx. 0 ohms :
• Ignition switch ON.
• Connect voltmeter between Connector C-9 terminal 1
and 3.
IF: Display battery voltage:
• Ignition switch OFF. • Connect ohmmeter between connector C-9 terminal2 and ECM connector C-2 terminal C2. • Then connect ohmmeter between TCM connector C-91 terminal CB and ECM connector C-2 terminal C2. IF: Display approx. 0 ohms:
• Check for short between connector C-9 terminal 2
and ground and between terminal 2 and B+. IF OK, GOTO TCM MEM·CAL REPLACEMENT.
See TECH1 OPERATOR'S MANUAL
Check wire for open.
Check Engine Control
Module (ECM)
and wire
to ECM and connector C-9.

7A-110 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 41
SOLENOID 1-2/3-4 SHORT TO PLUS
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.
H-7
• There are two tests of the LSD: when the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC41 ).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
solenoids ( 1-2/2-3, 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 plus.
@ 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
0.88 seGond after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
,.... BATTERY-1 C-90
I INPUT I ( A4 GRN/WHT I IGNITION I ? RED/GRN H-42 )) 8 I INPUT A7 II BRN/VEL H-10
I { I r"'
( 12 BRN/BLK I I GROUND I f A3 BRN/RED 2(~
I
I A2 ( 16 I I
I I
I
I
I I
I I
I I
I
SHIFT& I
I BANDAPPLY C-91 BRN/WHT H-10
SOLENOID I (
I _:oNTROL _I C12 10
·~ ciJr
SHifT . SHIFT
II II SOLENOID II SOLENOID
' y
-"--------------.J
•-::------ECM MAIN RELAY
>---=---=--~--< ~----3(-D-,1'1-- --"~ L -2(B,l M 7
r-- -r ----r -·---
1-- --
AUTOMATIC I
I TRANSMISSION
I I
I BAND 1 APPLY I SOLENOID I
I I
I I
TRANSMISSION
CONTROL MODULE (TCMI
•

AUTOMATIC TRANSMISSION (4L30-E) 1 A-111
DIAGNOSTIC TROUBLE CODE (DTC) 41
SOLENOID 1·2/3-4 SHORT TO PLUS
• Ignition switch OFF.
• Disconnect Transmission Control Module (TCM)
connectors C-90 and C-91.
• Connect ohmmeter between connector C-90 terminals A2 and A7 (TCM ignition) then between A2 and A4 (TCM battery) then between A2 and C12.
IF: Short circuit:
• Check for faulty connector or wiring between terminal A2 and the shorted terminal.
• Repair.
• Connect ohmmeter between A2 and A3 then between
A2 and A9.
IF: Short circuit:
The
problem is intermittent. GOTO INTERMITTENT
CONDITIONS.

7A-112 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 42
SOLENOID 2-3 SHORT TO PLUS
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.
• There are two tests of the LSD: when the engine
is cranked (DTC82) and
when the ignition is
turned ON (DTC42).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the
shift
solenoids (1-2/2-3, 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 HISD. 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 ~:onditions:
CD The solenoid Low side connected to TCM
terminal A3 shorted to plus.
® 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
1.03 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
• Recovery conditions: To recover, do an IGNITION
CYCLE.
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-113
DIAGNOSTIC TROUBLE CODE (DTC) 42
SOLENOID 2-3 SHORT TO PLUS
• Ignition switch OFF.
• Disconnect Transmission Control Module (TCM)
connectors C-90 and C-91.
• Connect ohmmeter between connector C-90 terminals A3 and A7 (TCM ignition) then between A3
and A4 (TCM battery) then between A3 and C12.
IF: Short circuit:
• Check for faulty connector or wiring between terminal A3 and the shorted terminal.
•
Repair.
• Connect ohmmeter between A3 and A2 then between
A3 and A9.
IF: Short circuit:
The
problem is intermittent. GOTO INTERMmENT CONDITIONS.