Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 922
7A1–8
TRANSMISSION CONTROL SYSTEM (4L30–E)
Gear Shift Control
F07RT034
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–9
Winter Drive Mode
1. Operation
The winter switch will operate when switched on after
all of the following conditions are present:
Conditions:
a. The select lever 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 “D”, “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. Feeds the data to PCM.
I
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
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
Engine coolant
temperature sensor
Senses the engine coolant temperature, and feeds the data to PCM.
A
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.
Shift solenoid A, B
Selects shift point and gear position suited to the vehicle running condition on
the basis of PCM output.
O
S
O
L
Band apply solenoid
Controls oil flow suited to the vehicle running condition on the basis of PCM
output.
U
T
E
N
Torque Converter
Clutch PWM solenoid
Controls clutch apply suited to the vehicle running condition on the basis of PCM
output.
P
U
T
O
I
D
Force motor
(Pressure regulator
valve)
Adjusts the oil pump delivery pressure to line pressure suited to the vehicle
running condition on the basis of PCM output.
S
Power drive mode lamp
Informs the driver whether the vehicle is in power mode or not.
I
G Winter drive mode lamp
Informs the driver whether the vehicle is in winter mode or not.
N
CHECK TRANS lamp
Informs the driver of failure in the system.
A
L
ATF warning lamp
Lights when ATF oil temperature rises.
ABS signal
When the select lever is at “Reverse” or “L” range, sends a signal to the ABS
controller as one of the ABS control conditions.
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 GOTO “SECTION” means to continue to check
going to the “section”.
4. The GOTHROUGH “SECTION” means to go
through the “section” and then to go back to the place
the GOTHROUGH 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: GOTO DIAGNOSTIC CHECK.
B. Staying on: GOTHROUGH CHECK TRANS
CHECK.
C. Is never ON when the ignition key is turned on:
GOTHROUGH CHECK TRANS CHECK
D. Is ON during 2 seconds at ignition but OFF after:
Normal operation. No DTC or malfunction.
821RW018
Diagnostic Check
This test determines if the transmission or its input or
output connections or sensors are failing.
1. Connect the Tech 2: GOTHROUGH 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 finding the problem.
1. GOTHROUGH “CHECK TRANS” CHECK
2. IF it is flashing and the flash is 0.2 seconds ON
and 0.2 seconds OFF, this means that you should
have a DTC stored. Please recheck GOTO
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).
Normal
C07RY005
Abnormal
C07RY004
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