Isuzu Trooper (1998-2002 year). Manual - part 773

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–1

TRANSMISSION

TRANSMISSION CONTROL SYSTEM (4L30–E)

CONTENTS

Service Precaution

7A1–2

. . . . . . . . . . . . . . . . . . . . . . 

General Description

7A1–2

. . . . . . . . . . . . . . . . . . . . . 

Electronic Control Diagram

7A1–3

. . . . . . . . . . . . . 

Powertrain Control Module (PCM)

7A1–4

. . . . . . . 

Control System Diagram

7A1–5

. . . . . . . . . . . . . . . 

Shift Control

7A1–6

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Band Apply Control

7A1–6

. . . . . . . . . . . . . . . . . . . . 

Torque Converter Clutch Control
 (Electronically Controlled Capacity
 Clutch = ECCC)

7A1–6

. . . . . . . . . . . . . . . . . . . . . . 

Line Pressure Control

7A1–6

. . . . . . . . . . . . . . . . . . 

On–Board Diagnostic System

7A1–6

. . . . . . . . . . . 

Fail Safe Mechanism

7A1–6

. . . . . . . . . . . . . . . . . . . 

Torque Management Control

7A1–6

. . . . . . . . . . . . 

ATF Warning Control

7A1–6

. . . . . . . . . . . . . . . . . . . 

ABS Control

7A1–6

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Reverse Lock Out Control

7A1–6

. . . . . . . . . . . . . . 

Downhill Control

7A1–6

. . . . . . . . . . . . . . . . . . . . . . . 

Uphill Control

7A1–6

. . . . . . . . . . . . . . . . . . . . . . . . . 

Shift Mode Control

7A1–7

. . . . . . . . . . . . . . . . . . . . . 

Gear Shift Control

7A1–8

. . . . . . . . . . . . . . . . . . . . . 

Winter Drive Mode

7A1–9

. . . . . . . . . . . . . . . . . . . . . 

Backup Mode

7A1–9

. . . . . . . . . . . . . . . . . . . . . . . . . 

Functions of Input / Output Components

7A1–10

. . 

Diagnosis

7A1–11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Electronic Diagnosis

7A1–11

. . . . . . . . . . . . . . . . . . . 

Check Trans Indicator

7A1–11

. . . . . . . . . . . . . . . . . . 

Diagnostic Check

7A1–11

. . . . . . . . . . . . . . . . . . . . . . 

“Check Trans” Check

7A1–12

. . . . . . . . . . . . . . . . . . 

Tech 2 OBD II Connection

7A1–14

. . . . . . . . . . . . . . 

Transmission Data

7A1–19

. . . . . . . . . . . . . . . . . . . . . 

OBD II Diagnostic Management System

7A1–20

. . 

16 – Terminal Data Link Connector (DLC)

7A1–21

. 

Malfunction Indicator Lamp (MIL)

7A1–22

. . . . . . . . 

DTC Types

7A1–22

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

Clear DTC

7A1–23

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC Check

7A1–23

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

PCM Precaution

7A1–23

. . . . . . . . . . . . . . . . . . . . . . . 

Information On PCM

7A1–24

. . . . . . . . . . . . . . . . . . . 

Intermittent Conditions

7A1–24

. . . . . . . . . . . . . . . . . 

Transmission And PCM Identification

7A1–25

. . . . . 

Isuzu UBS

7A1–25

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Diagnostic Trouble Code (DTC)
 Identification

7A1–26

. . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0218 Transmission Fluid Over
 Temperature

7A1–27

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0705 Transmission Range Switch
 (Mode Switch) Illegal Position

7A1–29

. . . . . . . . . . . . 

DTC P0706 Transmission Range Switch
 (Mode Switch) Performance

7A1–33

. . . . . . . . . . . . . . 

DTC P0711 Transmission Fluid Temperature
 (TFT) Sensor Performance

7A1–37

. . . . . . . . . . . . . . 

DTC P0712 Transmission Fluid Temperature
 (TFT) Sensor Circuit Low Input

7A1–40

. . . . . . . . . . . 

DTC P0713 Transmission Fluid Temperature
 (TFT) Sensor Circuit High Input

7A1–43

. . . . . . . . . . . 

DTC P0719 Brake Switch Circuit Low
 (Stuck On)

7A1–46

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0722 Automatic Transmission Output
 Speed Sensor (OSS) Low Input

7A1–49

. . . . . . . . . . 

DTC P0723 Automatic Transmission Output
 Speed Sensor (OSS) Intermittent

7A1–52

. . . . . . . . . 

DTC P0724 Brake Switch Circuit High
 (Stuck Off)

7A1–55

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0730 Gear Error Without Input Speed

7A1–57

DTC P0742 Torque Converter Clutch (TCC)
 System Stuck On

7A1–60

. . . . . . . . . . . . . . . . . . . . . . . 

DTC P0748 Pressure Control Solenoid (PCS)
 (Force Motor) Circuit Electrical

7A1–62

. . . . . . . . . . . 

DTC P0751 Shift Solenoid A Performance
 (Stuck OFF)

7A1–64

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0752 Shift Solenoid A Performance
 (Stuck ON)

7A1–66

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0753 Shift Solenoid A Electrical

7A1–68

. . . . . 

DTC P0756 Shift Solenoid B Performance
 (Stuck OFF)

7A1–72

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0757 Shift Solenoid B Performance
 (Stuck ON)

7A1–74

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P0758 Shift Solenoid B Electrical

7A1–76

. . . . . 

DTC P1850 Brake Band Apply Solenoid
 Malfunction

7A1–81

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DTC P1860 TCC PWM Solenoid Electrical

7A1–86

. 

Test Description

7A1–86

. . . . . . . . . . . . . . . . . . . . . . . 

DTC P1870 Transmission Component Slipping
 (TCC Stuck OFF)

7A1–89

. . . . . . . . . . . . . . . . . . . . . . . 

Circuit Diagram (LHD)

7A1–91

. . . . . . . . . . . . . . . . . . . 

Circuit Diagram (RHD)

7A1–93

. . . . . . . . . . . . . . . . . . . 

Harness Connector Faces (LHD)

7A1–95

. . . . . . . . . . 

Harness Connector Faces (RHD)

7A1–97

. . . . . . . . . . 

Transmission Fluid Temperature (TFT) Sensor
Specifications

7A1–99

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

SECTION

7A1–2

TRANSMISSION CONTROL SYSTEM (4L30–E)

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

General Description

The 4L30–E is a 4–speed fully automatic transmission. It
uses a microcomputer as a control unit to judge running
conditions including throttle opening rate and vehicle
speed, then it sets the shifting point in the optimum timing
so that best driving performance can be achieved.
In addition, the built–in shift mode select function can
select three shift modes according to the driver’s
preference:

D

Normal mode –Normal shift pattern.

D

Winter mode –Starts in 3rd gear to reduce slippage on
ice or snow.

D

Power mode has a delayed upshift for when more
powerful acceleration is required.

Also, the built–in fail safe function (“backup mode”)
assures driving performance even if the vehicle speed
sensor, throttle signal or any solenoid fails.
Further, the self–diagnostic function conducts diagnosis
in a short time when the control system fails, thus
improving serviceability.
The major features of 4L30–E are as follows:

D

A compact structure consisting of 2 sets of planetary
gears and flat torque converter.

D

Electronic control selects the optimum shift mode
according to the driving conditions.

D

Electronic control maintains the optimum hydraulic
pressure for clutch, band brake as well as
transmission so that shift feeling is improved.

D

Two sets of planetary gears reduce friction of power
train.

Also, a lockup mechanism in the torque converter
reduces fuel consumption.

D

Wide gear ratio and high torque rate of torque
converter provide excellent starting performance.

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–3

Electronic Control Diagram

C07RY00034

7A1–4

TRANSMISSION CONTROL SYSTEM (4L30–E)

Powertrain Control Module (PCM)

C07R200018