Isuzu KB P190. Manual - part 1022

ON-VEHICLE SERVICE (AW30–40LE)  7A3-3 

Diagnosis 

Basic Troubleshooting 

AW30–40LE transmission, with Transmission Control
Module (TCM), differs from the Mechanical – Hydraulic 
control type transmissions. Accordingly, its
troubleshooting procedure differs also. 

Before troubleshooting an TCM, 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
troubleshooting chart should speed the procedure. 

 

 
  

 

 

F07R200005-X 

 
 

7A3-4  ON-VEHICLE SERVICE (AW30–40LE) 

Troubleshooting Chart 

Numbers are arranged in order of probability. 

 

Perform inspections starting with number one and
working up. 

 

 
 

 

 

A/T : Automatic

 Tr

ans

mis

s

ion 

 

ON-VEHICLE SERVICE (AW30–40LE)  7A3-5 

 
 

 

 

A/T : Automatic

 Tr

ans

mis

s

ion 

 

 

7A3-6  ON-VEHICLE SERVICE (AW30–40LE) 

 
 

 

 

A/T : Automatic

 Tr

ans

mis

s

ion