check engine ISUZU TROOPER 1995 Workshop Manual

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
•

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)
•

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-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)
•

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.
•

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)
•