transmission ISUZU TROOPER 1995 Workshop Manual

7A-126 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 54
MODE SWITCH ILLEGAL POSITION
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Circuit Description:
• The mode switch supplies the Transmission
Control Module (TCM) with information re­
garding the
selector lever position: P, R, N, D, 3, 2
or L. The selector lever position is indicated by
the state of four ON/OFF contacts. The mode
switch is located on one side of the transmission.
It is on the transmission manual shaft and is fixed
to the main case.
• The mode switch is also used to provide the
information P or N to the engine crank wiring.
The engine can be cranked only if connector C-43
terminal 4(H) is connected to terminal 1(E), which
is connected to ground.
• The mode switch is also used to provide the back
up
lamp power in reverse. This is the reason
why the mode switch is supplied through a 15A
fuse (C-3). This fuse can burn due
to short circuit
in the back
up lamp. •
When
this fuse is open, the mode switch does
not work and DTC54 is set.
• The mode position is defined by the shift linkage
which is a link between the shift lever and the
mode switch. A bad adjustment of the shift
linkage can create a mode switch problem
(DTC53).
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD Selector Pin A and Pin B and Pin C are not
active: no position is identified then.
@ Based upon Table 1, in Park shift selector
position the code is set when Pin A is open or
shorted to ground.
@ The conditions need to be present for at least
5 seconds.
• Action after the detection time: BACKUP MODE
•
Recovery Gonditions: To recover, do an IGNITION
CYCLE.
ii!Qpi.lifiiUI@ii!ll
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-127
DIAGNOSTIC TROUBLE CODE (DTC) 54
MODE SWITCH ILLEGAL POSITION
• Install scan tool GOTH ROUGH TECH1 CONNECTION. • Ignition switch ON. Engine OFF. • Selector FO: DATALIST: "SELECTOR POS".
• Move shift selector lever through all positions and
compare results with Table 1. IF: all selector pin displays correct:
The
problem is
intermittent.
GOTO INTERMITTENT
CONDITIONS.
Table 1
• Check fuse and wire to connector C-43 terminal 5 (D) for opens.
GOTHROUGH MODE SWITCH
SETTING PROCEDURE (PACiii· 14-llli
If problem not solved, replace mode
switch.
• Check the wire and connector. • Repair.
SHIFT SELECTOR POSITION
TECH 1 DISPLAY p R N D 3 2 L
SELECTOR PIN A X X X X
SELECTOR PIN B X
X X X
SELECTOR PIN C X
X X X
SELECTOR PIN P X
X X
X
Note: "X" indicates TECH1 displays" ACTIVE". •
Disconnect
mode switch connector C-
43. • Connect ohmmeter between terminal 5(D) and respectively all terminals of mode switch connector C-43.
• Move shift selector lever through all positions and compare results with
Table 1. IF: One selector pin display is
incorrect:
• Check wire to cruise control unit and
Transmission Control Module (TCM).
•
Repair.

7A-128 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 55
BRAKE SWITCH SHORT TO GROUND OR OPEN
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The brake switch is a switch on the brake pedal
that is used to provide the information: brakes
are
applied. This is used by different features:
cruise control, stop
light and Transmission
Control Module (TCM).
•
The TCM uses the information (brakes applied)
mainly to release the Torque Converter Clutch
(TCC).
•
The brake switch input is constantly connected to
battery when the pedal is pressed. TCM terminal
D9 is connected to Voltage.
• The brake switch input is opened when the pedal
is released.
TCM terminal D9 is grounded.
r----
IBRAKESW I INPUT I
I I C-91 GRN/YEL H-7 I >-D9--~~~------~<
I II a
II
I GROUND I C1 I { }
I I >D1
I I
I I ._ ___ j
TRANSMISSION
CONTROL
MODULE (TCM) BLK!ORN
~-11
B~LU~q
Diagnostic
Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
CD Brake seen as applied during an acceleration
from less than 10 Km/h to more than 60 Km/h
within 6 seconds.
@ After this acceleration the vehicle speed was
higher than 60 Km/h during at least 6
seconds.
@ No Malfunction: Output Speed (DTC11 ).
Downshift Protection (DTC62).
@ The conditions need to be present for at least
5
times during an ignition cycle.
• Action after the detection time: No action but, as
the brake is seen as applied, the TCC is never
applied.
• Recovery conditions: To recover, brake has to be
released.
CRUISE CONTROL UNIT(8) RELAY
CRUISE MAIN (4)
BATTERY(+)
!'~~s:_ d B-14 ~ _ I _B-14 ~--<~~
2 L--_I 1
STOP LIGHT SW
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-129
DIAGNOSTIC TROUBLE CODE (DTC) 55
BRAKE SWITCH SHORT TO GROUND OR OPEN
• Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON. Engine ON.
• Select FO: DATA LIST: uBRAKE SWITCW.
•
Apply brake. IF: Display is uACTIVE":
The problem is
intermittent.
GOTO
INTERMITTENT
CONDITIONS. •
Check the short circuit to ground or open.
• Repair.

7A-130 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC
TROUBLE CODE (DTC)·56
BRAKE SWITCH SHORT TO PLUS
This DTC does NOT flash the CHECK TRANS
indicator and does
NOT set the BACKUP MODE.
Circuit Description:
• The brake switch is a switch on the brake pedal
that is used to provide the information: brakes
are
applied. This is used by different features:
cruise
control, stop light and Transmission
Control Module (TCM).
•
The TCM uses the information (brakes applied)
mainly to release the Torque Converter Clutch
(TCC).
• The brake switch input is constantly connected to
battery when the pedal is pressed. TCM terminal
D9 is connected to Voltage.
•
The brake switch input is opened when the pedal
is released. TCM terminal D9 is grounded.
r----
IBRAKESW I INPUT I
I I C-91 GRN!YEL H-7 I lf~D-9--~~~------~~
I II I
I GROUND { 1 ?c1 II I >o1
I I
I I
.._ ___ J
TRANSMISSION
CONTROL
MODULE (TCM)
H-11
BLK!ORN sq
BLK!BLU ~
1
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
•
Detection conditions:
CD Brake seen as released during a deceleration
from more than 60 Km/h to less than 10 Km/h
within 6 seconds.
® Before this deceleration the car vehicle speed
was
higher than 60 Km/h during at least 6
seconds.
@ No Malfunction: Output Speed (DTC11).
Downshift Protection (DTC62).
@ The conditions need to be present for at least
5 times; during an ignition cycle.
•
Action atte~r the detection time: No action but, as
the brake is seen as released, the TCC is applied
even when the brake is applied.
•
Recovery conditions: To recover, brake has to be
released.
BATTERY(+)
,.------, d / '
GRN/YEL I /~;3 I ~-~3' I
~4 I I 1 I
STOP LIGHT <0---.Jr ~~l/ \3 1 ___ , 2/
' / ' BRAKE SW ,. .......... -----.......
CRUISE CONTROL UNIT(8) RELAY CRUISE MAIN (4)
BATTERY(+)
~~~R~s:_ d
·:.:-: ---~~~-14
2 L--_I 1
STOP LIGHT SW
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-131
DIAGNOSTIC TROUBLE CODE (DTC) 56
BRAKE SWITCH SHORT TO PLUS
• Install scan tool GOTH ROUGH TECH1 CONNECTION.
• Ignition switch ON. Engine ON.
• Select FO: DATA LIST: uBRAKE SWITCH".
•
Do not touch brake. IF: Display is uACTIVEu:
•
Check the short circuit
to voltage.
•
Repair. The
problem is
intermittent. GOTO
INTERMITTENT CONDITIONS.

7A-132 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 61
GEAR ERROR
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP MODE.
Circuit Description:
• The Transmission Control Module (TCM) is
calculating the slippage of the Converter and
transmission based upon the Engine Speed, the
Output Speed and the current gear ratio.
• The slippage of the converter at a high enough
engine speed is low. Then the transmission
should not slip more than a given value when
there is no shift.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
CD Engine Speed > 3500 RPM
@ Using the ratio of the current gear the
Converter Slippage is calculated based upon
the engine speed and the output speed. This
slippage must be more than:
528
RPM in 4th gear
536 RPM in 3rd gear
556 RPM in 2nd gear
595 RPM in 1st gear
@ No malfunction: Engine Speed (DTC13).
Output Speed (DTC11 ). Downshift Protection
(DTC62).
@ The last change of shift solenoid was more
than 3 seconds ago.
® The conditions need to be present for at least
5.5 seconds.
• Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
NOTE:
The TCC slip data is a calculated value, and not an
accurate one.
This value should be used to see if the TCC is
engaged or not.
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-133
DIAGNOSTIC TROUBLE CODE (DTC) 61
GEAR ERROR
IF the car has been in BACKUP MODE when the problem occurred:
IF there is another DTC which causes Backup Mode (DTC20, DTC21, DTC22, DTC23, DTC25, DTC26, DTC31,
DTC32, DTC34, DTC35, DTC36, DTC37, DTC41, DTC42,
DTC44, DTC46, DTC54, DTC63, DTC82):
Verify this other diagnosis first (because,
in backup mode the
DTC61 is detected in Manual 2 at high engine speed though there is no problem). GOTO next DTCs.
Do a test drive to reproduce the problem using the DRIVER
INFORMATION.
IF reproduced without Backup
Mode:
GOTO TCM MEM-CAL
REPLACEMENT.

7A-134 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 62
DOWNSHIFT PROTECTION
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
• The output speed information is used to
determine if the transmission has to upshift or
downshift.
• If this information suddenly changes due to an
open circuit or some electrical interference the
transmission
would downshift.
• To avoid this the Transmission Control Module
(TCM) is constantly checking the variations of the
Output Speed. If this variation is too great (too
much decrease
or increase) DTC62 is set. This
variation is taken into
amount only when the
output speed is more than : 90 KPH.
• The transmission output speed sensor provides
information on vehicle speed to the TCM. The
speed sensor circuit consists
of a magnetic
induction
type sensor. The sensor is mounted
above a target wheel pressed on the output shaft
in the transmission extension. As the
output
shaft turns, the target wheel teeth induce a
TRANSMISSION SPEED SENSOR SHIELDS
variable voltage in the magnetic pickup. This
alternating current (AC) signal is provided to the
TCM. The
voltage increases with the speed of
the wheel but this is not used to define the speed
of the vehicle. As the vehicle moves faster, the
signal alternates faster between positive and
negative
voltages. The Output speed information
is proportiional to the frequency of the signal.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
G) Variation of Output Speed >16 KPH/0.025s.
@ Ignition ON more than 5 seconds.
@ Mode Switch not in P, N or R.
@ Last Output Speed > 90 KPH.
@ The conditions need to be present for at least
0.1 second.
• Action after the detection time: BACKUP MODE.
•
Recovery Gonditions: To recover, do an IGNITION
CYCLE.
- - - -C-90 / " I ,---:-"'\. '-. ~---+I WHT I I I I ~-10 I 'I I 'I M-1
5 r - - - - - - -TRANSMISSION ) f I SPEED SENSOR I . I f A 12 I I I I ~ I I I I
I II I I I I I I I I I
I II I I I I 1 I I
~~~~rie II I Ill I I
IINPUT II I I I I
1 1 1 I l I I I I -? ORN I I < I I
I l: ):~~ BLK \~ __ ~~ __ ~
I GROUNO I C-91 BLK/ORN H-11
I I I C1 BLK/BLU ~ 9_ I ____ I D1
TRANSMISSION
CONTROL MODULE (TCM)
2 I I (EXTENSION)
: : .·(C},h.·.. ,.·, .. ·.,· .. : HOUSING
II II ·<;',~ . I
I I . 'I ' . . I
I I I
) I> 1 ________ I
•

AUTOMATIC TRANSMISSION (4l30-E) 7 A .... 135
DIAGNOSTIC TROUBLE CODE (DTC) 62
DOWNSHIFT PROTECTION
W WARNING: If wire to connector C-90 terminal 812 is short to voltage,
Transmission Control Module (TCM) will be damaged.
GOTH ROUGH DTC53 first and do a test drive.
• Raise drive wheels.
•
Connect the TECH1 GOTHROUGH TECH1 CONNECTION.
•
Push FO: DATA LIST: DISPLAY. Read "AT OUTPUT SPEED".
IF: Output speed different from 0 RPM when the wheels are turning:
Problem is intermittent. GOTO INTERMITTENT
CONDITIONS.
•
Ignition switch OFF.
GOTO DTC 11: OUTPUT SPEED
FAILURE: Diagnostic Aids.
• Disconnect TCM connector C·90 and C-91. • Connect ohmmeter between connector C-90 terminals A 12 and
812.
IF: Display is approx. 3K ohms:
• Connect ohmmeter between connector C-90 terminal A12 and ground connector C-91 terminal C1. • Disconnect transmission speed sensor
connector M-15.
IF: Display indicates an open circuit:
• Check for faulty TCM
connection. If OK GOTO TCMMEM-CAL REPLACEMENT.
A
CONTINUED ON
NEXT-PAGe- •
Connect ohmmeter between terminals 1
and
2 of the speed sensor. IF: Display approx. 3K ohms:
• Wires from connector C-90 to sensor
connector are open or shorted together. • Repair.
Replace transmission
speed sensor.