ISUZU TROOPER 1995 Workshop Manual

AUTOMATIC TRANSMISSION (4L30-E) 7 A-69
CHART 1
DIAGNOSIS CONNECTOR AND VOLTAGE SUPPLY TEST
HOf AT All TIMES
r
L
GRN/WHT
FUSE C-14 15A
H-7 4
A4 C-90 DIAGNOSIS
CONNECTOR
(C-92) r------
1 I
----J 2
BLKI ORN
HOT IN ON OR START
FUSE C-8
15A I
I
__ _I
FUSE BOX
HOT AT ALL TIMES
---
l
A FUSE FL-3 30A
I I
I
I
H-13
BLKJYEL
1
[_ --
RED/WHT
L-___ _j
2
X-12
:1?.---- -:~t~v
I }-I t·---I L _______ _j
---r-12
H-42/o 8
3
BLK
RED/GRN
""--------i~ TO ENGINE
..- CONTROL
MODULE
(ECM)
YELl
BLK BLK!ORN
D16
BLKI
ORN
Cl Dl C-91 A7 AS C-90
RELAY& FUSE BOX
~------------------------BATTERY DIAGNOSTIC · · I
I INPUT INPUT GROUND IGNITION I
I INPUT I
TRANSMISSION
CONTROL MODULE
(TCM)
I SERIAL DATA
------------------------1 CB C-91
RED
YEL/BLU
L T GRN/BLU BLKIBLU
,_1_, ~n
I I ________ J
C12 C-2 r------------
1 I
I I
1...--------_J DATA LINK CONNECTOR (C-9)
ENGINE CONTROL MODULE (ECM)

7A-70 AUTOMATIC TRANSMISSION (4L30-E)
CHART 1
DIAGNOSIS CONNECTOR AND VOLTAGE SUPPLY TEST
TECH 1 REFERS TO CHART 1 WHEN THE EQUIPMENT IS CORRECTLY CONNECTED, BUT NO DATA (WITH IGNITION ON) IS RECEIVED
FROM TECH 1.
• PERFORM TECH 1 SELF-TEST . IS TECH 1 OK?
~ ~
• IGNITION SWITCH OFF . I SEE TECH 1 OPERATOR'S MANUAL. I • DISCONNECT TCM CONNECTOR C-90 AND C-91 .
• IGNITION SWITCH ON .
• CONNECT VOLTMETER BETWEEN TERMINAL A4 AND GROUND TERMINAL C1 OR D1 OF TCM CONNECTOR.
•
THEN CONNECT VOLTMETER BETWEEN TERMINAL A7 OR AS AND GROUND TERMINAL C1 OR D1 OF TCM
CONNECTOR.
DO BOTH DISPLAYS INDICATE
BATTERY VOLTAGE?
+ ~ • IGNITON SWITCH OFF. I CHECK FUSE OR WIRE FOR OPEN. I • CONNECT OHMMETER BETWEEN TERMINAL 2 OF 3-PIN DATA LINK CONNECTOR C-9 AND TERMINAL CS OF
TCM CONNECTOR C-91.
•
THEN CONNECT OHMMETER BETWEEN TERMINAL 1 OF
2-PIN DIAGNOSTIC CONNECTOR C-92 AND TERMINAL D16 OF TCM CONNECTOR C-91
• THEN CONNECT OHMMETER BETWEEN TERMINAL 2 OF 2-PIN DIAGNOSTIC CONNECTOR C-92 AND TERMINAL C1 OR D1 OF TCM CONNECTOR C-91.
DO BOTH DISPLAYS INDICATE APPROXIMATELY 0 OHMS?
~ ~ • CHECK FOR SHORT BETWEEN TERMINAL CS AND I CHECK WIRE FOR OPEN. I GROUND AND BETWEEN TERMINAL CS AND B+. IF OK, GOTO TCM MEM-CAL REPLACEMENT.
____________ _,,(

AUTOMATIC TRANSMISSION (4L30-E) 7 A-71
CHART 2: DIAGNOSTIC TROUBLE CODE (OTC)
I v
' FOR
DTC MALFUNCTION DIAGNOSIS
SEE PAGE
11 OUTPUT
SPEED FAILURE 7A -74
13 ENGINE SPEED FAILURE 7A -78
15 TRANSMISSION OIL TEMPERATURE SHORT TO PLUS OR OPEN 7A-80
16 TRANSMISSION OIL TEMPERATURE SHORT TO GROUND 7A-82
21 THROTTLE POSITION SENSOR SHORT TO PLUS OR OPEN 7A-84
22 THROTTLE POSITION SENSOR SHORT TO GROUND 7A-86
23 THROTTLE
POSITION SENSOR CONNECTOR OPEN 7A-88
25
SUPPLY VOLTAGE TOO LOW 7A-90
26 SUPPLY VOLTAGE TOO HIGH 7A-92
31 SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN 7A-94
32
SOLENOID 2-3 SHORT TO GROUND OR OPEN 7A-96
33 TCC
HIGH SHORT TO PLUS OR OPEN 7A-98
34
BAND APPLY SOLENOID SHORT TO GROUND OR OPEN 7A-102
35 FORCE MOTOR OPEN OR SHORT TO PLUS OR GROUND 7A-104
36 SHIFT HIGH SHORT TO GROUND OR OPEN 7A-106
37 TORQUE MANAGEMENT SERIAL LINE FAULTY 7A-108
41 SOLENOID 1-2/3-4 SHORT TO PLUS 7A-110
42 SOLENOID 2-3 SHORT TO PLUS 7A-112
43 TCC HIGH SHORT TO GROUND 7A-114
44
BAND APPLY SOLENOID SHORT TO PLUS 7A-116
46 SHIFT HIGH SHORT TO PLUS 7A-118
51 ENGINE COOLANT SWITCH SHORT TO GROUND, PLUS OR OPEN 7A-120
52 KICK DOWN ALWAYS ON OR SHORT TO GROUND 7A-122
53 MODE SWITCH IN P OR N OR R BAD POSITION 7A-124
54
MODE SWITCH ILLEGAL POSITION 7A-126
55 BRAKE
SWITCH SHORT TO GROUND OR OPEN 7A-128
56 BRAKE
SWITCH
SHORT TO PLUS 7A-130
61 GEAR ERROR 7A-132
62 DOWNSHIFT PROTECTION 7A-134
63
EPROM CSUM FAILURE 7A-137
82 SHIFT OR BAND APPLY SOLENOIDS FAULTY DURING DRIVING 7A-138

7A-72 AUTOMATIC TRANSMISSION (4L30-E)
CHART 3: TRANSMISSION AND TCM IDENTIFICATION
Chart 3 contains a list of all important information concerning rear axle ratio, Transmission Control Module
(TCM), and transmission identification.
VEHICLE
Type Engine
lsuzu/ 3.2L V6 Trooper
ISUZU TROOPER
2 3
Rr axle TCM
Ratio
ISUZU
Parts
No.
4.555 8-16218-439-0
8-16218-449-0
The
identification plate is located on the left-hand side
of the transmission above the mode switch.
Alpha
Code
JA
JB
AT Transmission identification on vehicle identification plate :
1. Model code (GW) 2. Calibration code
3. Production serial number
4. Production
part number
4
Calibration
Code
G16
Fig. 7A-10
TRANSMISSION
lsuzu Part
No. Model Code
8-960 17-587-0 GW
(4X4)
TCM IDENTIFICATION:
A. ISUZU part number B. Model of car C. DELCO part number D. Application E. Service TCM number
F. Broadcast code

AUTOMATIC TRANSMISSION (4L30-E) 7A-73
CHART 5: F5: ACTUATOR TEST QUICK CHECK
Before carrying out the Actuator Test, the selector lever should be placed in selector position "N ".
The ignition should be switched ON, engine not running.
TECH 1 DISPLAY
NOTES CORRECT RESULT FOR
DIAGNOSIS
SEE*1
SOLEN. 1-2/3-4 Press arrow up (ON)
"Click" heard from DTC31
Press
arrow down (OFF) transmission or 41
SOLENOID 2-3 Press arrow up (ON) "Click" heard from DTC 32
Press arrow down (OFF) transmission or 42
SHIFT SOLENOID Press arrow up (ON)
"Click" heard from DTC 82
Press arrow down (OFF) transmission
TCC SOLENOID Not used --
TCC HIGH (D) Press arrow up (ON)
"Click" heard from DTC33
Press
arrow down (OFF) transmission or 43
ATF LAMP Press arrow up (ON) A/TOIL TEMP lamp A/TOIL TEMPERA-
Press
arrow down (OFF) ON TURE INDICATOR
TEST (PAGE
~ 41)
POWER LAMP
Press arrow up (ON) POWER lamp ON TRANSMISSION Press arrow down (OFF) OPERATING
WINTER
LAMP Press arrow up (ON)
WINTER lamp ON MODE
TEST
Press arrow down (OFF) (P1'\(3E 1 42)
CHK. TRN. LAMP Press arrow up (ON) CHECK TRANS lamp CHECK TRANS
Press arrow down (OFF) ON CHECK (12AGE .11:8)
ABS OFF LAMP Not used - -
NOTE:
(*1) FOR DIAGNOSIS OF A DTC SEE CHART 2: DIAGNOSTIC
TROUBLE CODES (DTC) (~)

7 A-74 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 11
OUTPUT SPEED FAILURE
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
The transmission output speed sensor provides
information on vehicle speed to the Transmission
Control Module (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 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
proportional to the frequency of the signal.
TRANSMISSION SPEED SENSOR SHIELDS
Diagnostic Aids:
• This diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
CD Output Speed < OR = 0 KPH (0 MPH).
® Engine Speed > 3000 RPM.
@ No Malfunction: Engine Speed DTC 13. Mode
Switch DTC54.
@ Selector lever not in Park, Reverse, or Neutral.
@ The conditions need to be present for at least
5 seconds.
• Action after the detection time:
CD CHECK TRANS Indicator is turned ON.
® TCM in BACKUP MODE
•
Recovery conditions :To recover do an IGNITION
CYCLE.
- - -,.,.. C-90 "" - -~ ~ ""\' - -:-' M-15 r - - - - - - -TRANSMISSION I I WHT I , I , H<~o I , I , t , I SPEED SENSOR I +I > I I I I 6 I I I I 2 I (EXTENSION) I A12 I I I HOUSING
I II 111
11111111 ©I
', VEHICLE ', II I
I I I I I I I I I I !I ' ,~, 1
:
SPEED . I I I I I I I I I II "-.
I INPUT I I I I I I I I I I
I I I
ORN I I I I I I I I
I
-1 ~812 BLK l-- -~b - -~ ,> - - - - - - -I
I ll B11 s
I GROUND I C-91 BLK/ORN H-9_11
I I I C1 BLK/BLU : I
J __ -_I D1
TRANSMISSION
CONTROL MODULE
(TCM)
•

AUTOMATIC TRANSMISSION (4L30·E) 7 A-75
DIAGNOSTIC TROUBLE CODE (DTC) 11
OUTPUT SPEED FAILURE
W CAUTION: If wire to connector C-90 terminal 812 is short to voltage, Transmission Control Module
(TCM) will be damaged.
IF the DTC 53 is set:
I I
~
GOTH ROUGH DTC 53 first J I IF you have a SCAN TOOL: TECH17 I and do a test drive. I
cf
$
• Raise drive wheels. • Ignition switch OFF.
• Connect the TECH1 GOTH ROUGH TECH1 • Disconnect TCM connector C-90 & C-91.
CONNECTION. • Connect ohmmeter between connector C-90 terminal
• Push "FO": DATALIST: DISPLAY. Read •AT OUTPUT A12 and terminal 812 . SPEED". IF: display is approx. 3K ohms: IF: Output Speed different from 0 RPM when the wheels are turning:
diJ
§J
$
T
Problem is intermittent. GOTO INTERMITTENT
CONDITIONS. • Connect ohmmeter between connector C-90 terminal A12 and ground connector C-91 terminal C1.
IF: display indicates an open circuit:
$ ~
Check for faulty TCM connection. IF OK GOTO TCM MEM-CAL
REPLACEMENT.
HINT: the wire between TCM terminal 812 and sensor connector M-15 terminal 1 can be shorted to ground or open without creating a problem because the TCM 812 pin is connected to the TCM ground internally and the signal is
detected only on the A 12 input.
• Check wire for a short to ground between terminal A 12 and sensor
connector M-15 terminal 2. IF: display indicates a short circuit:
I
A CONTINUED
ONNEX~
NO
• Disconnect transmission speed
sensor connector M-15.
• 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 .
I Replace transmission
speed sensor.

7A-76 AUTOMATIC TRANSMISSION (4L30-E)
CONTINUED FROM
PREVIOUS~ A
• Connect voltmeter between connector C-90 terminal
A 12 and ground connector C-91 terminal C1.
• Ignition switch ON. IF: display indicates approximately 0 volt:
Check
for faulty TCM
connectors.
IF OK GOTO TCM MEM·
CAL REPLACEMENT.
Check wire for a short
to voltage between
terminal A12 and
speed sensor
connector M-15.

AUTOMATIC TRANSMISSION (4L30-E) 7A-77
MEMO

7A-78 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 13
ENGINE SPEED FAILURE
This DTC flashes the CHECK TRANS indicator and
set the BACKUP
MODE.
Circuit Description:
The ignition module sends a signal to the
Transmission
Control Module (TCM) that indicates
engine speed in
RPM. The Engine Control Module
(ECM) also receives this signal. When the vehicle is
in
neutral gear and the engine is at idle, the engine
speed
should be approximately 800 RPM.
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< or= 200 RPM.
@ Output Speed > 1024 RPM.
@ Acceleration > 2 Km/h/s.
@ No DTC: Output Speed DTC11, Downshift
Protection DTC62 or Mode Switch Illegal
Position DTC54.
@ Selector Lever not in Park or Neutral.
@ The conditions need to be present for at least
0.5
second.
• Action after the detection time: BACKUP MODE
•
Recovery conditions: To recover do an IGNITION
CYCLE
>--
-------t~lt--H--4~>-_4=.--+· TACHOMETER (METER [!1]31 r - - - -C-91 BLK/RED ~ H·S
I ENGINE I fD12 (A SPEED I I - - - - - - - --, DISTRIBUTOR I INPUT I I ASSEMBLy
I I I I 4 E-21 l I 1 r----ots 1 I I ENGINE I MODULE I
I II I I SPeED I OUTPUT 1
I II I ~---..J I
I I I H-11 I I
I GROUND {II fc1 BLK!ORN~q I_---------
I ) BLK/BLU ~ 1
'----j D1 TRANSMISSION CONTROL MODULE (TCMI
..