Isuzu Trooper (1998-2002 year). Manual - part 704

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–13

DIAGNOSIS

BASIC TROUBLESHOOTING

AW30-40LE transmission, called Electronic Controlled Transmission (ECT), differs from oil pressure control type
transmissions in that it is controlled by a microcomputer. Accordingly, its troubleshooting procedure differs also.
Before troubleshooting an ECT, first determine whether the problem is electrical or mechanical. To do this, just refer to
the basic troubleshooting flowchart provided below. If the cause is already known, using the basic troubleshooting
chart below along with the general troubleshooting chart on the following page should speed the procedure.

7A–14

AUTOMATIC TRANSMISSION (AW30-40LE)

821RY00012

F07LV002

740RY00013

740RY00014

SELF-DIAGNOSIS

Warning to the driver

• When trouble has occurred to throttle position sensor, output

revolution sensor, input revolution sensor, neutral start
switch, engine revolution signal, speed meter signal, or
solenoids, "CHECK TRANS" lamp is blinked (1.25 Hz) even
during driving to warn the driver.

• The trouble is recorded by trouble code in TCM.

• When temporary trouble has been shooted, the "CHECK

TRANS" lamp stops blinking. This blinking can be stopped
by setting the ignition key off. But the trouble code remains
memorized in TCM.

Self-diagnosis code (Flashing code) display

• For quick search for faulty parts, 12 different items of trouble

code are indicated by "CHECK TRANS" lamp blinking.

• The storaged trouble codes can be identified by shorting the

terminals No. 11 and No. 4 or 5 (ground) of data link
connector with a lead wire.

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–15

F07LV001

Indication Method:

1. Terminals No. 11 are No. 4 or 5 (ground) of data link

connector are short circuited.

2. Turn the ignition key to the ON position.

3. In case there no trouble, normal code is indicated.

4. In case a plurality of trouble codes have occurred at a time,

each code is indicated three times in numerical order.

NOTE:  
Power line runs through data link connector. 
Be careful shorting with a lead wire, etc. 
(The vehicle side of control module may be damaged.) For
identification of trouble code, connect Tech2 to data link
connector.

Clear of trouble code memory

1. Clear the trouble code memory using F1: Clear DTC

Information for Tech2.

2. After more than 1 second has elapsed after the ignition key

has been turned ON, short between No. 11 and No. 4 or 5
(ground) of data link connector. Then, after 1 second, but
within 6 seconds, discontinue shorting.

7A–16

AUTOMATIC TRANSMISSION (AW30-40LE)

Flashing code

F07RY00016