Isuzu N-Series. Manual — part 893
Transmission Control System (Smoother) 7A-27
Reset Switch
Select Solenoid
Selector Lever
Connector No.
B-105
Connector Color
Black
Test Adapter No.
J-35616-4A
Pin
Wire Color
Pin Function
1
—
Not Used
2
—
Not Used
3
—
Not Used
4
BLK/ORN
Reset Switch Voltage Feed
5
—
Not Used
6
GRY/BLU
Reset Switch Signal
Connector No.
J-234
Connector Color
Green
Test Adapter No.
J-35616-42
N7A2113E
1
2
N7A2103E
Pin Wire
Color
Pin
Function
1
BLK
Select Solenoid Valve Ground
2
WHT/BLK
Select Solenoid Valve Control
Connector No.
N-19
Connector Color
White
Test Adapter No.
J-35616-33
Pin Wire
Color
Pin
Function
1
LT GRN/
RED
Illumination Lamp Voltage Feed
2
RED/BLK
Selector Lever “R” Position Switch
Signal
3
YEL/RED
1st Gear Start Switch Signal
4
GRN/BLK
Selector Lever “A” Position Switch
Signal
5
BLU
Economy Mode Switch Signal
6
WHT/BLK
Selector Lever “N” Position Switch
Signal
7
ORN
Selector Lever “D” Position Switch
Signal
8
PNK/BLK
Selector Lever “
−” Position Switch
Signal
9
BLK
Selector Lever Ground
10
BLU/BLK
Selector Lever “+” Position Switch
Signal
10
9
8
7
6
5
4
3
2
1
N7A2115E
7A-28 Transmission Control System (Smoother)
Solenoid Valves & Transmission Fluid Temperature
Sensor In-line Harness Connector
Turbine Speed Sensor
Connector No.
J-237
Connector Color
Gray
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
RED/YEL
Lock Up Clutch Solenoid Valve
Control
2
YEL/RED
Transmission Fluid Temperature
Sensor Signal
3
YEL/BLK
Gearshift Clutch Solenoid Valve
Control
4
BLU/WHT
Transmission Fluid Temperature
Sensor Low Reference
N7A2116E
N7A2110E
Connector No.
J-232
Connector Color
Gray
Test Adapter No.
J-35616-33
Pin Wire
Color
Pin
Function
1
ORN/BLU
Turbine Speed Sensor Low
Reference
2
WHT/BLU
Turbine Speed Sensor Signal
Transmission Control System (Smoother) 7A-29
Diagnostic Information and Procedures
General Service Information
Non-OEM Parts
All of the on-board diagnostic (OBD) has been
calibrated to run with original equipment manufacturer
(OEM) parts. Accordingly, if commercially sold sensor or
switch is installed, it makes a wrong diagnosis and turn
on the transmission warning lamp. Aftermarket
electronics, such as cellular phones, stereos, and anti-
theft devices, may indicate electromagnetic interference
(EMI) into the control system if they are improperly
installed. This may cause a false sensor reading and
turn on the transmission warning lamp.
Poor Vehicle Maintenance
The sensitivity of OBD will cause the transmission
warning lamp turn on if the vehicle is not maintained
properly. Restricted oil filters, fuel filters, and crankcase
deposits due to lack of oil changes or improper oil
viscosity can trigger actual vehicle faults that were not
previously monitored prior to OBD. Poor vehicle
maintenance cannot be classified as a “non-vehicle
fault”, but with the sensitivity of OBD diagnostics, vehicle
maintenance schedules must be more closely followed.
Visual/Physical Transmission Compartment
Inspection
Perform a careful visual and physical transmission
compartment inspection when performing any
diagnostic procedure or diagnosing the cause of an
emission test failure. This can often lead to repairing a
problem without further steps. Use the following
guidelines when performing a visual/physical
inspection:
• Inspect all vacuum hoses for punches, cuts,
disconnects, and correct routing.
• Inspect hoses that are difficult to see behind other
components.
• Inspect all wires in the transmission compartment
for proper connections, burned or chafed spots,
pinched wires, contact with sharp edges or contact
with hot exhaust manifolds or pipes.
Basic Knowledge of Tools Required
Lack of basic knowledge of this powertrain when
performing diagnostic procedures could result in an
incorrect diagnosis or damage to powertrain
components. Do not attempt to diagnose a powertrain
problem without this basic knowledge. A basic
understanding of hand tools is necessary to effectively
use this section of the service manual.
Transmission Warning Lamp
Basically, the transmission warning lamp is turned on
when the transmission control module (TCM) detects a
DTC that will impact the vehicle performance. When the
transmission warning lamp remains “ON” while the
engine is running, or when a malfunction is suspected
due to a driveability problem, a Diagnostic System
Check must be performed. The procedures for these
checks are given in Diagnostic System Check -
Transmission Controls.
Reading Flash Diagnostic Trouble Codes (DTC)
The provision for communicating with the TCM is the
Data Link Connector (DLC). The DTCs 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 transmission
warning 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, the ignition switch must
be moved to the “ON” position, with the engine not
running. The transmission warning lamp will indicate a
DTC three times is a DTC is present and history. 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. The flash DTC display will
continue as long as the DLC is shorted.
Notice:
• If DTC is present, buzzer also sounds with a lamp
illumination.
• When present DTC and history DTC are mixed,
present DTC is always output first, regardless of
number of DTC.
7A-30 Transmission Control System (Smoother)
Reading Diagnostic Trouble Codes (DTCs) with
The Tech 2
The procedure for reading DTC(s) is used a diagnostic
Tech 2. To read DTCs, use the Tech 2 “Read DTC Info
As Stored By ECU”.
Clearing Diagnostic Trouble Codes (DTCs) with
The Tech 2 or without Tech2
Do not clear DTCs unless directed to do so by the
service information provided for each diagnostic
procedure. To clear DTCs, use with the Tech 2 “Clear
DTC Information”. If there is no Tech 2, clear with reset
switch operation.
DTC Clear Method with Reset Switch Operation
1. Turn ON the ignition, with the engine OFF.
2. Use a jumper wire and the DLC terminal “11”
(diagnostic request) is pulled “Low” (grounded) by
jumped to DLC terminal “4”.
3. Press reset switch for at least 1 second and
release it within 6 seconds.
4. If completed, buzzer will sound with a short beep.
Notice:
If the buzzer does not sound, restart clear procedure
from step 1.
Tech 2 Scan Tool
Isuzu recommend using Tech 2. Refer to the Tech 2
Users Guide for proper start up procedures.
Operating Procedure
1. Press Enter at start screen.
2. Select Diagnostic > appropriate vehicle
identification > Transmission > Smoother.
3. The following table shows, which functions are
used the available equipment versions.
F0: Diagnostic Trouble Codes
The purpose of this mode is to display stored trouble
code in the TCM. When “Clear DTC Information” is
selected, “Clear DTC Information”, warning screen
appears. This screen informs you that by cleaning DTCs
“all stored DTC information in the TCM will be erased”.
F1: Data Display
The purpose of this mode is to continuously monitor
data parameters. The current actual values of all
important sensors and signals, solenoid commands in
the system are display through this mode.
Refer to the “Tech 2 Data List” in this section.
F2: Snapshot
“Snapshot” allow you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault. The snapshot will collect
parameter information around a trigger point that you
select.
Refer to the Tech 2 user instructions for more
information.
Example: DTC 24 stored
ON
OFF
2.4
0.6
0.6
0.6
0.6
2.4
0.3
0.3
0.3
1.2
1.2
Unit: second
2nd digit number
0.6
1st digit number
0.3
0.6
0.6
2
4
N7A2118E
F0: Diagnostic Trouble Codes
F0: Read DTC Info As Stored By ECU
F1: Clear DTC Information
F1: Data Display
F2: Snapshot
F3: Programming
F0: Program Vehicle Type
F1: PTO Requested Engine Speed
F2: Program Speedometer Driven Gear
N7A2119E
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