ISUZU TROOPER 1995 Workshop Manual

AUTOMATIC TRANSMISSION (4L30-E) 7 A-89
DIAGNOSTIC TROUBLE CODE (DTC) 23
THROTTLE POSITION SENSOR CONNECTOR OPEN
Check Engine Control Module (ECM)
DTC.
IF: DTC on Throttle Position Sensor (TPS) exists:
I
Check diagnosis of ECM and repair. • Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON, engine not running.
• Selector lever position "P". • Select FO: DATA LIST: "TPS SIGNAL". IF: TECH 1 DISPLAY approx. 2.5 volts whatever the throttle valve position:
IF: TPS connector E-5 on I the engine is open: DTC 23 is intermittent. GOTO INTERMITTENT
CONDITIONS.
~
NO
Repair. j
• Ignition switch OFF. Disconnect connector C-91. Connect ohmmeter between connector C-91 terminals C5 and C6. If open circuit: • Check for an open between connector C-91 terminal C5 to connector E-5 terminal 3 with a simultaneous open of the terminal C6 to the connector E-5 terminal1. This faulty connection can be at the intermediate connector H-5 terminal 10 and 11.
• Repair. If not OK: Ignition switch OFF. Disconnect sensor.
• Connect ohmmeter between sensor terminals 3 wiper and 1 low side. If resistance between TPS terminal 3 and 1 does not change when the throttle valve angle is changed: Replace TPS.

7 A-90 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 25
SUPPLY VOLTAGE TOO LOW
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Specification decreases with the transmission
oil temperature:
Circuit Description:
-40°C (-40°F) = S.7 volts
90°C (194°F) = 9.0 volts
150°C (304°F) = 9.2 volts The ignition voltage of Transmission Control
Module (TCM) terminals A7 and AS is monitored by
the TCM and when the voltage is too low (approx. 9
volts) the DTC25 is stored and the BACKUP MODE
is set.
@ The condition needs to be present for at least
1 second
• Action after the detection time: BACKUP MODE
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Recovery conditions: To recover, the ignition
voltage must be higher than specification.
Specification decreases
with the transmission oil
temperature:
-40°C (-40°F) = 9.2 volts
90°C (194°F) = 9.5 volts
150°C (304°F) = 9.6 volts
• Detection conditions:
CD Ignition voltage measured between TCM
terminal A7 or AS and ground C1 is lower
than specification .
. · fU I
I '
f:L;~soA L., ____ J
RELAY & FUSE BOX
1--, {)-:,.--____..J BATTERY
l
T
L __ I
r
I C-14 C-8 I I 15A 15A FUSE -__ + _ j BOX
H-13t 3
H-7 'x~.~~'---7 r ]_-
GRN/WHT
BATTERY I GROUND INPUT IGNITION I INPUT I
L-----------TRANSMISSION
CONTROL MODULE
(TCM) IGN.SW.
RED/WHT
C-1 C-1 C-2
A6 B1 C16
r -;ATTERV INPUT-l
I
I l _____ j
ENGINE
CONTROL MODULE
(ECM)
I I
I-_j GENERATOR

AUTOMATIC TRANSMISSION (4L30-E) 7A-91
DIAGNOSTIC TROUBLE CODE (DTC) 25
SUPPLY VOLTAGE TOO LOW
• Ignition switch ON. Engine OFF.
• Connect voltmeter between B+ and B-terminals of battery. IF: Display greater than 9 volts:
•
Engine running.
• Connect voltmeter between B+ and B-terminals of battery.
IF: display between 13 and 16 volts?
• Ignition
switch OFF. • Disconnect Transmission Control Module (TCM)
connector C-90 and C-91. • Ignition switch ON. Engine OFF.
• Connect voltmeter between connector C-90 terminal A7 and connector C-91 terminal C1. IF: Display greater than 9 volts:
Check for faulty connection and if OK.
GOTO INTERMITTENT CONDITIONS.
Check fuse and wire to A7, AS and C1 for
open circuit.

7 A-92 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 26
SUPPLY VOLTAGE TOO HIGH
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
The ignition voltage of Transmission Control
Module (TCM) terminals A7 and AS is monitored by
the TCM and when the voltage is too high (approx.
16 volts) the
DTC26 is stored and the BACKUP
MODE is set.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
BATTERY
I FUSE I
L..-FL·1~A-I
RELAY & FUSE BOX
r
I
I
H-7
GRN/WHT
H-11 BLK/ORN
• Detection conditions:
CD Ignition voltage measured between TCM
terminal
A7 or AS and ground C1 is higher
than 16 volts.
® The condition needs to be present for at least
1 second.
• Action after the detection time : BACKUP MODE
• Recovery conditions: To recover, ignition voltage
<16
volts.
-F~;K--:
Fl:.-2 F•. L·3 50A 3DA 1
-_I
1--1 (1-,,--...----J L __ I
IGN.SW.
C-8 I 15A FUSE _ j BOX
3
RED/WHT
RELAY & FUSE BOX
r 1
I-..J GENERATOR
1
,-----------e-T ~:>( BLK/BLU
~ I RED/GRN
1
C-91 ~p:!_ C1 !-~ _ _ ~8-_ A7 C-90
C-1 C-1 C-2
I - - - -BATTER~ - - - -I
I GROUND INPUT IGNITION I INPUT l ___________ l
TRANSMISSION
CONTROL MODULE
(TCM)
_ A6 _B1_ C16
r BATTERY INPUT I I I
l _____ j
ENGINE
CONTROL
MODULE (ECM)

AUTOMATIC TRANSMISSION (4l30·E) 7 A-93
DIAGNOSTIC TROUBLE CODE (DTC) 26
SUPPLY VOLTAGE TOO HIGH
• Ignition switch ON. Engine OFF.
• Connect voltmeter between B+ and B-terminals of battery. IF: Display greater than 16 volts:
•
Engine running. • Connect voltmeter between B+ and B-terminals of
battery. IF: Display between 3 to 16 volts:
• Ignition
switch OFF. • Disconnect Transmission Control
Module (TCM) connector C-90 and
C-91. • Ignition switch ON. Engine ON.
•
Connect voltmeter between
connector C-90 terminals A7 and
connector C-91 terminal C1. IF: Display higher than 16 volts:
Check regulator. The problem is
intermittent.
GOTO
INTERMITIENT CONDITIONS.

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)
•