engine ISUZU KB P190 2007 Workshop Repair Manual

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
(4W D 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 (2W D
Only)
Power, 3rd start indicator
lamp
Check trans indicator
lamp
Data link connector Self-diagnosis
function



Transmission
Control
Module (TCM)
4L mode
Tachometer
signal output
APP PW M
position signal
output
Figure 54. Control Circuit Block Diagram

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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/ SW L&R/
B.P/SW 2-4
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: Shifting the select lever to manual position at high speed, the transmission may hold the gear position
until vehicle speed get down to certain speed to prevent engine overrun.
- Engaged or operated
- Operative when accelerating



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CONSTRUCTION AND FUNCTION 7A1-41
1st Gear in D, 3, 2 Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. As
the low clutch is engaged, the movement of the rear internal gear is restricted. Since the low one-way clutch
acts at the same time, counterclockwise rotations of the rear internal gear are locked. As a result, the driving
force transmitted to the rear sun gear rotates the rear planetary carrier clockwise, then the rotation speed is
decreased and multiple force is transmitted to the output shaft.
When decelerating, the rotating speed of the rear planetary carrier (rear pinion gear) is higher than that of the
rear sun gear and the rear internal gear attempts to rotate clockwise. At this time, the low one-way clutch
does not act but races, and therefore the rear internal gear rotates clockwise. The reverse torque from the
driving shaft is not transmitted to the engine side and the engine brake does not act.










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7A1-42 CONSTRUCTION AND FUNCTION
1st Gear in L Position
The basic mechanism is the same as in the D, 3, and 2 positions. To apply the engine brake, the low &
reverse brake is engaged to restrict the movement of the low one-way clutch.
When decelerating, as the rear internal gear is fixed, reverse torque from the drive shaft is transmitted to the
engine side so that the engine brake is applied.







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CONSTRUCTION AND FUNCTION 7A1-43
2nd Gear in D, 3, 2 Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. As
in the case of the 1st gear, the low clutch is engaged and the movement of the rear internal gear is restricted.
Since the 2-4 brake is engaged, the front sun gear is fixed. As a result, movement of the rear internal gear is
restricted, and the driving force transmitted to the rear sun gear rotates the rear planetary carrier clockwise.
The rotating speed of the rear planetary carrier is higher than in 1st gear as the rear internal gear rotates.
When decelerating, the engine brake is applied.








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7A1-44 CONSTRUCTION AND FUNCTION
3rd Gear in D, 3 Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. As
in the case of the 1st gear and 2nd gear, the low clutch is engaged and the movement of the rear internal
gear is restricted. Since the high clutch is engaged, the driving force from the input shaft is directly
transmitted to the rear internal gear. As a result, the rpm of the rear sun gear and the rear internal gear
becomes the same as that of the input shaft, so that the rear pinion gear rotates not independently but
together with the rear sun gear and rear internal gear.
When decelerating, the engine brake is applied.





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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-5
Diagnostic Trouble Code (DTC) List
DTC Flash CodeDTC Descriptor
P0560 16 System Voltage Malfunction
P0602 — Control Module Programming Error
P0705 17 Inhibitor Switch Malfunction
P0710 15 Transmission Fluid Temperature Sensor Circuit Malfunction
P0717 14 Input/Turbine Speed Sensor “A” Circuit No Signal
P0722 11 Output Speed Sensor Circuit No Signal
P0727 13 Engine Speed Sensor Input Circuit No Signal
P0731 41 Gear 1 Incorrect Ratio
P0732 42 Gear 2 Incorrect Ratio
P0733 43 Gear 3 Incorrect Ratio
P0734 44 Gear 4 Incorrect Ratio
P0748 35 Line Pressure Solenoid Malfunction
P0753 31 Low & Reverse Brake Duty Solenoid Malfunction
P0758 32 2-4 Brake Duty Solenoid Malfunction
P0763 33 High Clutch Duty Solenoid Malfunction
P0768 34 Low Clutch Duty Solenoid Malfunction
P1120 22 Throttle Position Signal Malfunction
P1750 51 Low & Reverse Brake Fail Safe Valve Malfunction
P1755 52 2-4 Brake Fail Safe Valve Malfunction
P1853 26 Low & Reverse Brake Pressure Switch Malfunction
P1858 27 2-4 Brake Pressure Switch Malfunction
P1860 36 Lock Up Duty Solenoid Malfunction
P1863 28 High Clutch Pressure Switch Malfunction
P1875 25 Ground Return Malfunction

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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-17
Transmission Control Module (TCM)
Connector End Views
TCM (Gray connector)
TCM (White connector)
Connector No.C-94
Connector color Gray
Test adapter No. J-35616-64A
Pin No. Wire color Pin function
1 RED/ WHT Battery voltage
2 YEL/ VIO P range switch signal
3 RED Brake pedal switch signal
4 PNK/ WHT 3rd start lamp control
5 VIO/ GRN Keyword serial data communication
6 — Not used
7 BLK/ RED Engine speed signal input
8 — Not used
9 — Not used
10 BLK/ YEL Vehicle speed signal output (2WD)
11 GRN/ WHT 3rd start switch signal
12 BLU/ WHT 4WD low signal output
13 — Not used
14 — Not used
15 — Not used
16 RED/ WHT Accelerator pedal position (APP) signal input
17 BLK/GRN 3 range switch signal
18 YEL/ BLK Diagnostic request switch
19 ORN/ BLU Transmission oil temperature lamp control
20 GRY/ YEL Check trans lamp control
1
10
19
2
11
20
3
12
21
4
13
5
14
6
15
7
16
22
8
17
23
9
18
24
21 PNK Power lamp control
22 — Not used
23 — Not used
24 GRN/ YEL Power drive switch signal
Connector No. C-95
Connector color White
Test adapter No. J-35616-64A
Pin No. Wire color Pin function
1 RED/ YEL 2-4 brake TFP switch signal
2 PNK/ BLK 2 range switch signal
3 BRN/ RED ISS sensor signal
4 BLU TFT sensor signal
5 BLK Ground
6 BLU/ BLK Low & reverse brake solenoid control
7 BLK/ YEL 2 & 4 brake solenoid control
8 RED High clutch solenoid control
9 WHT/ BLU Low clutch solenoid control
10 RED/ BLK N range switch signal 11 BLU D range switch signal
12 YEL Low & reverse brake TFP switch
13 YEL/ RED OSS sensor signal
14 BLU/ BLK TFT sensor low reference
15 — Not used
16 — Not used
17 BLK TCC solenoid control
18 WHT Ignition voltage
1
10
19
2
11
20
3
12
21
4
13
5
14
6
15
7
16
22
8
17
23
9
18
24

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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-21
Diagnostic Information and Procedures
Diagnostic Starting Point - Transmission Controls
Begin the system diagnosis with Diagnostic System
Check - Transmission Controls. The Diagnostic System
Check - Transmission Controls will provide the
following information:
• The identification of the control modules which command the system.
• The ability of the control modules to communicate through the serial data circuit.
• The identification of any stored diagnostic trouble codes (DTCs) and the their statuses.
The use of the Diagnostic System Check -
Transmission Controls will identify the correct
procedure for diagnosing the system and where the
procedure is located. Reading Flash Diagnostic Trouble Codes (DTC)
The provision for communicating with the TCM is the
Data Link Connector (DLC). The DTC(s) stored in the
TCM memory can be read either through a hand-held
diagnostic scanner such as Tech 2 plugged into the
DLC or by counting the number of flashes of the
CHECK TRANS lamp when the diagnostic test terminal
of the DLC is grounded. The DLC terminal “11”
(diagnostic request) is pulled “Low” (grounded) by
jumped to DLC terminal “4”, which is a ground wire.
Once terminals “11” and “4” have been connected, turn
the ignition switch ON, with the engine OFF. The
CHECK TRANS lamp initially flashes 12. If more than
one DTC has been stored in the TCM's memory, the
DTCs will be output numerical order with each DTC
being displayed three times. All the stored DTCs are
flashed, then return 12 and continue to flash the DTC. If
no DTC exists, the CHECK TRANS flashes 12
continuously. The flash DTC display will continue as
long as the DLC is shorted.
Diagnostic Trouble Codes (DTC) Clear Method
If there is no scan tool, history DTCs can be cleared by
removing the ECM (B) (10A) fuse for at least 10
seconds with the ignition switch OFF.
Unit: second
131313323232121313133232321212
Example: DTC 13 stored
ON
OFF
Example: DTC 32 stored
Example: DTC 13 and 32 are stored
ON
OFF 3
1
0.40.40.40.4
32
0.40.40.40.40.4
2nd digit number1st digit number
3.23.20.40.40.41.2
2nd digit number 1st digit number
0.40.41.23.23.2

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7A2-22 TRANSMISSION CONTROL SYSTEM (JR405E)
Diagnostic System Check - Transmission Controls
Description
The Diagnostic System Check - Transmission Controls
is an organized approach to identifying a condition that
is created by a malfunction in the electronic
transmission control system. The Diagnostic System
Check must be the starting point for any driveability
concern. The Diagnostic System Check directs the
service technician to the next logical step in order to
diagnose the concern. Understanding and correctly
using the diagnostic table reduces diagnostic time, and
prevents the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. Lack of communication may be because of a partial
or a total malfunction of the serial data circuit.
8. If there are other modules with DTCs set, refer to the
DTC list. The DTC list directs you to the appropriate
diagnostic procedure. If the control module stores
multiple DTCs, diagnose the DTCs in the following
order:
• Component level DTCs, such as sensor DTCs, solenoid DTCs, actuator DTCs, and relay DTCs.
Diagnose the multiple DTCs within this category in
numerical order. Begin with the lowest numbered
DTC, unless the diagnostic table directs you
otherwise. Diagnostic System Check Transmission Controls
Important: • DO NOT perform this diagnostic if there is not a driveability concern, unless another procedure
directs you to this diagnostic.
• Before you proceed with diagnosis, search for applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO NOT clear the DTCs.
• Ensure the battery has a full charge.
• Ensure the battery cables (+) (-) are clean and tight.
• Ensure the TCM grounds are clean, tight, and in the correct location.
• Ensure the TCM harness connectors are clean and correctly connected.
• Ensure the TCM terminals are clean and correctly mating.
• If there are gear ratio DTC's (P0731, P0732, P0733 or P0734), diagnose sensor DTCs and
solenoid DTCs first.
Diagnostic System Check - Transmission Controls
Step Action Value(s)Yes No
1 Install a scan tool.
Does the scan tool turn ON? —
Go to Step 2 Go to Scan Tool
Does Not Power Up
2 1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the listed control modules.
•TCM
• Electronic hydraulic control unit (EHCU) [ABS module] (If so equipped)
• Supplemental restraint system (SRS) control module (If so equipped)
Does the scan tool communicate with all the listed
control modules? —
Go to Step 3 Go to Scan Tool
Does Not
Communicate with Keyword Device
3 Attempt to start the engine.
Does the engine start and idle? —
Go to Step 4 Go to Engine
Cranks but Does
Not Run in engine control section
4 Select the DTC display function for the following
control modules:
•TCM
• Engine control module (ECM)
Does the scan tool display any DTCs? —
Go to Step 5 Go to Step 9
5 Does the scan tool other control module
communication fault DTCs? —Go to Applicable
DTC Go to Step 6

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