Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1571
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–9
Winter Drive Mode
1. The winter switch will operate when switched on after
all of the following conditions are present:
a. The gear select position is “D” range only.
b. Vehicle speed is 7 mph (11 km/h) or less.
c. Transmission oil temperature is 130
°
C (266
°
F) or
less.
d. Accelerator opening is at 8% or less.
2. Cancel Release
1. Cancellation by driver
a. Turning off the winter drive mode switch
b. Shifting select position to “3”, “2”, or “L” (Winter
drive mode is not canceled by selecting “N”, “R”,
or “P”)
c. Ignition key is turned off.
2. Automatic cancellation
a. When vehicle runs at 21mph (34 km/h) or more
for 1 second or more
b. When transmission oil temperature reaches
130
°
C (266
°
F) or above
NOTE: The mode returns to normal drive mode or power
drive mode after the winter drive mode is canceled.
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 Powertrain Control Module (PCM).
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.
7A1–10 TRANSMISSION CONTROL SYSTEM (4L30–E)
Functions of Input / Output Components
Components
Function
Speed sensor
(fixed to transmission)
Senses rotation of output shaft and feeds the data to Powertrain Control Module
(PCM).
Throttle position sensor
(TPS)
(fixed to engine)
Senses the extent of throttle valve opening and the speed of the throttle valve
lever motion to open the valve and feeds the data to PCM.
I
N
Brake switch
(fixed to brake pedal)
Senses whether the driver has pressed the brake pedal or not and feeds the
information to PCM.
N
P
U
Mode switch
(Fixed to transmission)
Senses the select lever position, and feeds the information to PCM.
U
T
S
Power drive switch
(fixed to front console)
Senses whether the driver has selected the power mode, and feeds the
information to PCM.
S
I
T/M oil temperature sensor
Senses the T/M oil temperature and feeds the data to PCM.
I
G
N
A
Engine coolant
temperature sensor
Senses the engine coolant temperature, and feeds the data to PCM.
A
L
Engine speed signal
Feeds the signals monitoring engine speed to PCM from crank angle sensor.
L
Air conditioning information
Senses whether the air conditioner has been switched on or not, and feeds the
information to PCM.
Winter switch (fixed to front
console)
Senses whether the driver has selected the winter mode, and feeds the
information to PCM.
Cruise controller
(Overdrive OFF signal)
Downshift takes place when overdrive OFF signal is received from auto cruise
controller integrated in PCM.
O
S
Shift solenoid A, B
Selects shift point and gear position suited to the vehicle running condition on
the basis of PCM output.
O
U
T
O
L
E
Band apply solenoid
Controls oil flow suited to the vehicle running condition on the basis of PCM
output.
P
U
T
E
N
O
Torque Converter
Clutch solenoid
Controls clutch engagement/disengagement suited to the vehicle running
condition on the basis of PCM output.
T
S
I
I
D
Force motor
(Pressure control
solenoid)
Adjusts the oil pump delivery pressure to line pressure suited to the vehicle
running condition on the basis of PCM output.
G
N
Power drive mode lamp
Informs the driver whether the vehicle is in power mode or not.
N
A
Winter drive mode lamp
Informs the driver whether the vehicle is in winter mode or not.
L
“CHECK TRANS” lamp
Informs the driver of failure in the system.
ATF warning lamp
Lights when ATF oil temperature rises. (only 4
×
4)
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–11
Diagnosis
Electronic Diagnosis
How To Diagnose The Problem
1. To avoid incorrect diagnostics, this book needs to be
followed accurately. Unless stated, do not jump
directly to a section that could contain the
solution. Some important information may be
missed.
2. The sections in CAPITALS and bold are the main
sections that can be found in the contents.
3. The go to “SECTION” means to continue to check
going to the “section”.
4. The go through “SECTION” means to go through the
“section” and then to go back to the place the go
through was written.
5. BASIC ELECTRIC CIRCUITS:
You should understand the basic theory of electricity.
This includes the meaning of voltage, amps, ohms,
and what happens in a circuit with an open or shorted
wire. You should also be able to read and understand
wiring diagrams.
Check Trans Indicator
Find CHECK TRANS indicator and verify if it is
A. Flashing: Go to DIAGNOSTIC CHECK.
B. Staying on: Go through CHECK TRANS CHECK.
C. Is never ON when the ignition key is turned on: Go
through CHECK TRANS CHECK
D. Is ON during 2 seconds at ignition but OFF after:
Normal operation. No DTC or malfunction.
821RY00067
Diagnostic Check
This test determines if the transmission or its input or
output connections or sensors are failing.
1. Connect the Tech 2: Go through Tech 2 OBD II
CONNECTION.
2. Turn on the ignition but not the engine.
3. Push “F0” on Tech 2 to see the Diagnostic Trouble
Code (DTC):
4. Do you have a DTC?
YES: write down all code numbers and do the DTC
CHECK
NO: the DTC can not help you find the problem.
1. Go through “CHECK TRANS” CHECK
2. IF it is flashing and the flash is 0.5 seconds ON
and 0.5 seconds OFF, this means that you should
have a DTC stored. Please recheck go to
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).
Normal
C07RY005
Abnormal
C07RY00042
7A1–12 TRANSMISSION CONTROL SYSTEM (4L30–E)
“Check Trans” Check
1. Indicator is ON during 2 seconds at ignition (or when
the engine is cranked) but it is OFF after the engine
starts. The indicator is working normally go to
DIAGNOSTIC CHECK.
821RY00067
Normal
C07RY005
2. Indicator is flashing and the flash is 0.5 seconds ON
and 0.5 seconds OFF always when ignition is on
(engine cranked or not). This means that there is a
malfunction. Go to DIAGNOSTIC CHECK.
Abnormal
C07RY00042
3. Indicator is staying ON always when Ignition is ON.
1. This means that connection between the lamp
and the indicator control unit is shorted to ground.
2. Verify if instrument panel terminal 27 of connector
I–1 is shorted to ground.
3. Verify if the indicator control unit connector B–26
terminal 20 is shorted to ground.
4. Verify that the instrument panel terminal 14 of
connector I–1 is connected to battery.
5. If problem solved: Go to CHECK TRANS
INDICATOR.
NO:Replace Powertrain Control Module (PCM).
4. Indicator is staying OFF with the ignition ON (engine
OFF).
1. This means that connection between the lamp
and the indicator control unit is shorted to battery
or opened.
2. Verify if instrument panel terminal 27 of connector
I–1 is shorted to battery or open.
3. Verify if the indicator control unit connector B–26
terminal 20 is shorted to battery or open.
4. Verify that the instrument panel terminal 14 of
connector I–1 is connected to battery. If not,
check the fuses and the connections (terminal 3
of connector H–18) voltage.
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