2004 ISUZU TF SERIES reverse switch

7A1-34 CONSTRUCTION AND FUNCTION
MAJOR INPUT/OUTPUT COMPONENT AND THEIR FUNCTIONS
Speed sensor Detects output shaft revolution and sends rpm signal to TCM.
Turbine sensor Detects input shaft revolution and sends rpm signal to TCM.
Engine speed sensor Inputs engine revolution from engine control computer.
Brake switch Detects brake pedal operated by the driver and sends signal to
TCM.
Inhibitor switch Detects select lever position and sends signal to TCM.
Mode select switch Detects "Power Drive" or "3rd Start" selected by the driver and
sends signal to TCM.
4L switch (4WD Only) Inputs 4L mode from transfer control computer.
ATF thermo sensor Detects ATF temperature and sends signal to TCM.
High clutch oil pressure switch Detects high clutch supply oil pressure and sends signal to
TCM.
2-4 brake oil pressure switch Detects 2-4 brake supply oil pressure and sends signal to
TCM.
Low & Reverse brake oil pressure switch Detects low & reverse brake supply oil pressure and signal to
TCM.
Throttle position sensor Inputs throttle opening angle from engine control computer.
Input
TCM Judges necessary line pressure, gear shifting point and lock-up
operation based on electrical signals from switches and
sensors and sends appropriate signals to solenoids.
Line pressure solenoid Regulates oil pump delivery pressure to the appropriate line
pressure for current driving condition based on signal from
TCM.
Low clutch solenoid Selects appropriate gear shifting position for current driving
condition and regulates low clutch supply oil pressure based on
signal from TCM.
High clutch solenoid Selects appropriate gear shifting position for current driving
condition and regulates high clutch supply oil pressure based
on signal from TCM.
2-4 brake solenoid Selects appropriate gear shifting position for current driving
condition and regulates 2-4 brake supply oil pressure based on
signal from TCM.
Low & Reverse brake solenoid Selects appropriate gear shifting position for current driving
condition and regulates low & reverse brake supply oil
pressure based on signal from TCM.
Lock-up solenoid Regulates lock-up pressure to appropriate level for current
driving conditions based on signal from TCM.
Mode indicator lamp Indicates POWER DRIVE or 3rd START switch position.
Speed meter signal (2WD Only) Outputs vehicle speed to speed meter.
A/T OIL TEMP indicator lamp Indicates A/T OIL TEMP indicator lamp in case of high
temperature.
Output
CHECK TRANS indicator lamp Indicates CHECK TRANS indicator lamp in case of
malfunction.

CONSTRUCTION AND FUNCTION 7A1-35
CONTROL CIRCUIT BLOCK DIAGRAM



Speed sensor
Turbine sensor
Brake switch
Inhibitor switch
Power drive, 3rd start
switch
ATF oil thermo sensor
High clutch oil pressure
switch
2-4 brake oil pressure
switch
Low & reverse brake oil
pressure switch
Transfer control module
(4WD Only)



Engine Control Module
(ECM)
Line pressure solenoid
Low clutch solenoid
High clutch solenoid
2-4 brake solenoid
Low & reverse brake
solenoid
Lock-up solenoid
ATF temperature
indicator lamp
Speed meter (2WD
Only)
Power, 3rd start indicator
lamp
Check trans indicator
lamp
Data link connector Self-diagnosis
function



Transmission
Control
Module
(TCM)
4L mode
Engine
speed
Throttle
angle
Figure 54. Control Circuit Block Diagram

CONSTRUCTION AND FUNCTION 7A1-37
COMPONENT AND THEIR OPERATING CONDITION

Clutch Brake Solenoid Pressure Switch
Select
lever
position
Gear
position
Gear
Shift
Lock-
up
L/C
H/C
R/C
L/O.C
L&R/B
2-4/B
L/C.S
H/C.S
L&R/
B.S
2-4/
B.S
L/U.S H/
C.P/
SWL&R/
B.P/
SW2-4
B.P/
SW
P - -

R Reverse -

N - -

1st

2nd
3rd


D
4th

1st

2nd
3rd


3
4th(*1)


1st

2nd

3rd(*1)



2
4th(*1)


1st
2nd(*1)

3rd(*1)



L
4th(*1)



*1:Transmission is shifted at high speed to prevent engine over-run.
- Engaged or operated
- Operative when accelerating

DIAGNOSIS (JR405E) 7A2-1
SECTION 7A2
DIAGNOSIS
TABLE OF CONTENTS
PAGE
BASIC TROUBLE SHOOTING..................................................................................................7A2-6
CHECK TRANS INDICATOR & SELF DIAGNOSIS..............................................................7A2-7
DIAGNOSIS WITH TECH 2........................................................................................................7A2-9
TECH 2 CONNECTION .................................................................................................. 7A2-9
TECH 2 OPERATING FLOW CHART (START UP)..............................................................7A2-10
TYPICAL SCAN DATA................................................................................................................7A2-13
MISCELLANEOUS TEST...........................................................................................................7A2-14
INTERMITTENT DIAGNOSIS....................................................................................................7A2-16
SNAPSHOT DISPLAY WITH TIS 2000....................................................................................7A2-17
SERVICE PROGRAMMING SYSTEM (SPS) ................................................................. 7A2-21
CIRCUIT DIAGRAM.....................................................................................................................7A2-24
PART LOCATION........................................................................................................................7A2-26
CONNECTOR LIST.....................................................................................................................7A2-31
DIAGNOSIS TROUBLE CODE TABLE...................................................................................7A2-33
FAIL-SAFE FUNCTION..............................................................................................................7A2-35
DTC P0722 (FLASH CODE 11) VEHICLE SPEED SENSOR NO SIGNAL......................7A2-36
DTC P0727 (FLASH CODE 13) ENGINE REVOLUTION SENSOR NO SIGNAL............7A2-38
DTC P0717 (FLASH CODE 14) TURBINE SPEED SENSOR NO SIGNAL......................7A2-40
DTC P0710 (FLASH CODE 15) ATF TEMPERATURE SENSOR FAILURE....................7A2-42
DTC P0560 (FLASH CODE 16) SYSTEM VOLTAGE FAILURE........................................7A2-43
DTC P0705 (FLASH CODE 17) INHIBITOR SWITCH FAILURE........................................7A2-44
DTC P1120 (FLASH CODE 22) THROTTLE SIGNAL FAILURE........................................7A2-46
DTC P1875 (FLASH CODE 25) GND RETURN CIRCUIT FAILURE.................................7A2-47
DTC P0753 (FLASH CODE 31) LOW & REVERSE BRAKE DUTY
SOLENOID FAILURE................................................................................................................7A2-48
DTC P0758 (FLASH CODE 32) 2-4 BRAKE DUTY SOLENOID FAILURE......................7A2-51
DTC P0763 (FLASH CODE 33) HIGH CLUTCH DUTY SOLENOID FAILURE................7A2-54
DTC P0768 (FLASH CODE 34) LOW CLUTCH DUTY SOLENOID FAILURE................7A2-57

7A2-2 DIAGNOSIS (JR405E)
PAGE
DTC P0748 (FLASH CODE 35) LINE PRESSURE SOLENOID FAILURE.......................7A2-60
DTC P1860 (FLASH CODE 36) LOCK-UP DUTY SOLENOID FAILURE.........................7A2-62
DTC P1853 (FLASH CODE 26) LOW & REVERSE BRAKE PRESSURE
SWITCH FAILURE......................................................................................................................7A2-64
DTC P1858 (FLASH CODE 27) 2-4 BRAKE PRESSURE SWITCH FAILURE................7A2-68
DTC P1863 (FLASH CODE 28) HIGH CLUTCH PRESSURE SWITCH FAILURE..........7A2-72
DTC P0731 (FLASH CODE 41) 1st GEAR RATIO ERROR................................................7A2-76
DTC P0732 (FLASH CODE 42) 2nd GEAR RATIO ERROR...............................................7A2-76
DTC P0733 (FLASH CODE 43) 3rd GEAR RATIO ERROR................................................7A2-76
DTC P0734 (FLASH CODE 44) 4th GEAR RATIO ERROR................................................7A2-76
DTC P1750 (FLASH CODE 51) LOW & REVERSE BRAKE FAIL-SAFE
VALVE FAILURE........................................................................................................................7A2-78
DTC P1755 (FLASH CODE 52) 2-4 BRAKE FAIL-SAFE VALVE FAILURE....................7A2-80
DTC P0602 Programming Error ................................................................................... 7A2-82
SYMPTOM DIAGNOSIS.............................................................................................................7A2-83
SYMPTOM DIAGNOSIS TABLE...............................................................................................7A2-84
No. A1: VEHICLE DOES NOT RUN IN D, 3, 2, L and RANGE..........................................7A2-93
No. A2: VEHICLE DOES NOT RUN IN R RANGE................................................................7A2-94
No. A3: VEHICLE DOES NOT RUN IN D, 3, 2 and RANGE...............................................7A2-95
No. B1: VEHICLE RUNS IN N RANGE...................................................................................7A2-96
No. B2: POOR ACCELERATION AT STARTING.................................................................7A2-97
No. B3: ENGINE RACE UP DURING STARTING (SLIP)....................................................7A2-100
No. B4: LARGE SHOCK WHEN SHIFT LEVER IS CHANGED TO N TO D
RANGE OR N TO R RANGE....................................................................................................7A2-103
No. B5: ENGINE STALLS WHEN SELECTING FROM N RANGE TO R, D, 3, 2
OR L RANGE...............................................................................................................................7A2-104
No. B6: ENGINE STARTER DOES NOT RUN IN P OR N RANGE...................................7A2-106
No. B7: ENGINE STARTER RUNS EXCEPT IN P OR N RANGE.....................................7A2-106
No. B8: EXTENDED TIME LAG WHEN SHIFT LEVER IS CHANGED TO N TO D........7A2-106
No. B9: EXTENDED TIME LAG WHEN SHIFT LEVER IS CHANGED TO N TO R........7A2-106
No. B10: BRAKE IS APPLIED IN R RANGE..........................................................................7A2-107
No. B11: INSUFFICIENT STARTING OR SHAKING IN D RANGE...................................7A2-107

DIAGNOSIS (JR405E) 7A2-5
PAGE
NO. Z3: MODE LAMP (POWER DRIVE OR 3RD START) LIGHTS UP WHEN
THE POWER MODE OR 3RD START MODE IS TURNED OFF .................................. 7A2-137
NO. Z4: OIL TEMPERATURE WARNING LAMP LIGHTS UP ...................................... 7A2-137
NO. Z5: SELECT LEVER FEELING IS FAULTY. .......................................................... 7A2-137
NO. Z6: POOR FUEL CONSUMPTION ......................................................................... 7A2-138
NO. Z7: PATTERN SELECT SWITCH IS FAULTY........................................................ 7A2-138
NO. Z8: OIL IS SPLASHED DURING THE RUNNING .................................................. 7A2-138
NO. Z9: ABNORMAL SMELL ........................................................................................ 7A2-138
NO. Z10: ATF QUANTITY IS LOW OR HIGH ................................................................ 7A2-138
NO. Z11: ABNORMAL OIL PRESSURE........................................................................ 7A2-139
NO. Z12: REVERSE BUZZER DOES NOT RING .......................................................... 7A2-139
STALL TEST .................................................................................................................. 7A2-140
LINE PRESSURE TEST................................................................................................. 7A2-141
TIME LAG TEST............................................................................................................. 7A2-143
TEST DRIVE................................................................................................................... 7A2-144
SHIFT POINT CHART .................................................................................................... 7A2-147
SHIFT POINT DIAGRAM................................................................................................ 7A2-149
TCM VOLTAGE CHECK ................................................................................................ 7A2-154

DIAGNOSIS (JR405E) 7A2-33
DIAGNOSIS TROUBLE CODE TABLE

Flash Code
(P-Code)

CHECK TRANS Flash Pattern

Description
CHECK
TRANS
Warning

11 (P0722) Vehicle Speed Sensor No Signal ON


12 (-) Normal -


13 (P0727) ON

Engine Revolution Sensor No
Signal

14 (P0717) Turbine Speed Sensor No Signal ON


15 (P0710) ATF Temperature Sensor FailureOFF


16 (P0560) System Voltage Failure ON


17 (P0705) Inhibitor Switch Failure ON


22 (P1120) Throttle Signal Failure ON


25 (P1875) GND Return Circuit Failure ON


26 (P1853) ON

Low & Reverse Brake Pressure
Switch Failure

27 (P1858) 2-4 Brake Pressure Switch FailureON


28 (P1863) ON

High Clutch Pressure Switch
Failure

31 (P0753) ON

Low & Reverse Brake Duty
Solenoid Failure

32 (P0758) 2-4BrakeDutySolenoidFailure ON


33 (P0763) ON
High Clutch Duty Solenoid Failure

DIAGNOSIS (JR405E) 7A2-35
FAIL-SAFEFUNCTION
Fail-Safe Condition
Flash Code
(P-Code)

Description
CHECK
TRANS
Warning

Gear Shift
Solenoid
Line
Pressure
Solenoid

Lock-up

Remark
11
(P0722)
Vehicle peed Sensor No
Signal ON 3rdFix All Stop - Inhibited
13
(P0727)
Engine Revolution Sensor
No Signal ON - - - Inhibited
14
(P0717)
Turbine Speed Sensor No
Signal ON 3rdFix All Stop - Inhibited
15
(P0710)
ATF Temperature Sensor
Failure OFF 3,2,L - - Inhibited*1
16
(P0560)
System Voltage Failure ON 3rdFix All Stop - Inhibited*2
17
(P0705)
Inhibitor Switch Failure ON 3rdFix All Stop - Inhibited
22
(P1120)
Throttle Signal Failure ON 3rdFix All Stop - Inhibited
25
(P1875)
GND Return Circuit
Failure ON 3rdFix All Stop - Inhibited*2
26
(P1853)
Low & Reverse Brake
Pressure Switch Failure ON No Fail-safe Function
27
(P1858)
2-4 Brake Pressure
Switch Failure ON No Fail-safe Function
28
(P1863)
High Clutch Pressure
Switch Failure ON No Fail-safe Function
31
(P0753)
Low & Reverse Brake
Duty Solenoid Failure ON 3rdFix All Stop - Inhibited
32
(P0758)
2-4 Brake Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
33
(P0763)
High Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
34
(P0768)
Low Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
35
(P0748)
Line Pressure Solenoid
Failure ON - - Stop -
36
(P1860)
Lock-up Duty Solenoid
Failure ON - - - Inhibited
41
(P0731)
1stGearRatioError ON No Fail-safe Function
42
(P0732)
2ndGearRatioError ON No Fail-safe Function
43
(P0733)
3rdGearRatioError ON No Fail-safe Function
44
(P0734)
4thGearRatioError ON No Fail-safe Function
51
(P1750)
Low & Reverse Brake
Fail-safe Valve Failure ON 3rdFix All Stop - Inhibited
52
(P1755)
2-4 Brake Fail-safe Valve
Failure ON 3rdFix All Stop - Inhibited
-
(P0602)
ECU Programming Error ON No Fail-safe Function
*1: When the engine speed is more than 470 rpm for 10 minuets, the lock-up and gear shift to 4th (over-drive) are
allowed.
*2: In case of fail-safe valve failure, gear shift to 4th (over-drive) is inhibited.