Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 628
7A1–12 AUTOMATIC TRANSMISSION (4L30-E)
BACKUP MODE
If a major system failure occurs which could affect safety or damage the transmission under normal
vehicle operation, the diagnostic system detects the fault and overrides the TCM.
The “CHECK TRANS” light flashes to alert the driver, and the transmission must be manually shifted
as follows:
Select lever position
Gear Ratio Selected
D
4 (Fourth)
Manual 3
4 (Fourth)
Manual 2
3 (Third)
Manual L
1 (First)
R
Reverse
Shifts are firmer to prevent clutch slip and consequent wear. The fault should be corrected as soon as
possible.
AUTOMATIC TRANSMISSION (4L30-E) 7A1–13
FUNCTIONS OF INPUT/OUTPUT COMPONENTS
Components
Function
Speed sensor
Senses rotation of output shaft and feeds the data to Transmission
(fixed to transmission T/M) Control Module (TCM)
Throttle
Senses the extent of throttle valve opening and the speed of the throttle
position sensor (TPS)
valve lever motion to open the valve and feeds the data to TCM (fed to
(fixed to engine)
Engine Control Module (ECM) also)
Brake Switch (SW)
Senses whether the driver has pressed the brake pedal or not and feeds
(fixed to brake pedal)
the information to TCM
Kick-down SW (fixed to
Senses whether the driver has pushed the accelerator pedal fully or not
accelerator pedal)
and feeds the information to TCM
Mode SW (fixed to T/M)
Senses the select lever position and feeds the information to TCM
Power drive SW
Senses whether the driver has selected the power mode and feeds the
(fixed to front console)
information to TCM
T/M oil temp. sensor
Senses the T/M oil temperature and feeds the data to TCM
Engine coolant
Senses the engine cooling water temperature and feeds the data to TCM
temperature SW
(feeds the signal from ECM)
Engine speed signal
Feeds the signals monitoring engine speed to TCM from crank angle sensor
(feeds the signal from ECM)
Air conditioning
Senses whether the air conditioner has been switched on or not and
information
feeds the information to TCM
On-board diagnostic input
By monitoring the Ground (GND), the location of failure is shown on the
T/M monitor lamp (“CHECK TRANS”) by flashing the diagnostic trouble
code
Shift solenoid A, B
Selects shift point and gear position suited to the vehicle running con-
dition on the basis of TCM output
Band apply solenoid
Controls oil flow suited to the vehicle running condition on the basis of
TCM output
Torque Converter
Controls clutch engagement/disengagement suited to the vehicle
Clutch solenoid
running condition on the basis of TCM output
Force motor
Adjusts the oil pump delivery pressure to line pressure suited to the
(Pressure regulator
vehicle running condition on the basis TCM output
valve)
Power drive mode lamp
Informs the driver whether the vehicle is in power mode or not
T/M monitor lamp
Informs the driver of failure in the system. It also displays the self diag-
(“CHECK TRANS”)
nosis code.
Data Link Connector (DLC)
When connected with TECH2 or tester, can communicate the data for
function check, etc. (fed to ECM also). When TECH2 is not connected,
can communicate the signal for torque management with ECM.
When short-circuited with the bipolar connector, the T/M monitor lamp
displays a failure by code.
S
O
L
E
N
O
I
D
O
U
T
P
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T
S
I
G
N
A
L
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N
P
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T
S
I
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N
A
L
7A1–14 AUTOMATIC TRANSMISSION (4L30-E)
RANGE REFERENCE CHART
1-2/3-4 2-3
O/DRIVE
OVERRUN FOURTH
THIRD
REVERSE
SECOND
PRINCIPLE
BAND
RANGE
GEAR
SOL SOL
ROLLER
CLUTCH
CLUTCH
CLUTCH
CLUTCH
CLUTCH
SPRAG
ASSEMBLY
ENGINE
N.C. N.O.
CLUTCH
(OC)
(C4)
(C3)
(RC)
(C2)
ASSEMBLY
(B)
BRAKING
(OFW)
(PFW)
P-N
OFF
ON
APPLIED
NO
R
REVERSE OFF
ON
LD
APPLIED
APPLIED
LD
NO
1ST
OFF
ON
LD
APPLIED
LD
APPLIED
NO
2ND
ON
ON
LD
APPLIED
APPLIED
FW
APPLIED
YES
D
3RD
ON
OFF
LD
APPLIED
APPLIED
APPLIED
NE
YES
4TH
OFF OFF
FW
APPLIED
APPLIED
APPLIED
NE
YES
1ST
OFF
ON
LD
APPLIED
LD
APPLIED
NO
3
2ND
ON
ON
LD
APPLIED
APPLIED
FW
APPLIED
YES
3RD
ON
OFF
LD
APPLIED
APPLIED
APPLIED
NE
YES
1ST
OFF
ON
LD
APPLIED
APPLIED
LD
APPLIED
YES
2
2ND
ON
ON
LD
APPLIED
APPLIED
FW
APPLIED
YES
L
1ST
OFF
ON
LD
APPLIED
APPLIED
LD
APPLIED
YES
LD : LOCKED IN DRIVE
FW : FREEWHEELING
NE : NOT EFFECTIVE
C07RT010
AUTOMATIC TRANSMISSION (4L30-E) 7A1–15
NORMAL OPERATION OF 4L30-E
TRANSMISSION
1.
TORQUE CONVERTER CLUTCH (TCC)
APPLICATION CONDITIONS:
The TCC is normally applied in 2nd, 3rd and 4th
gears only when all of the following conditions
exist:
– The engine coolant temperature is above 70°C
(158°F).
– The brake pedal is released.
– The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and
4th gears when the transmission oil temperature is
above 135°C (275°F).
This mode should be canceled at 125°C (257°F).
2.
SPECIAL SHIFT PATTERN WHEN THE
ENGINE IS COLD:
A special shift pattern is activated when the engine
coolant temperature is below 70°C (158°F). (3-4
shifts for example are delayed for small throttle
openings and will occur a few MPH higher)
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