TM 9-2320-387-24-l
TRANSMISSION
SYSTEM
DIAGNOSTIC FLOWCHART
r&
1 TESTOPTIONS
KNOWN INFO
.
CONNECT DIAGNOSTIC SWITCH
CABLE TO THE TRANSMISSION
CONTROL MODULE (TCM) J2
CONNECTOR. DISCONNECT
GLOW PLUG CONTROLLER. TURN
VEHICLE IGNITION TO THE RUN
POSITION. DOES TRANSMISSION
CHECK LAMP STEADILY
ILLUMINATE?
VISUAL
1
REASON FOR QUESTION
Ttansmisssion
check lamp may
be faulty.
NO LEAKS
FLUID OK
SHIFTER OK
POSSIBLE
PROBLEMS
TRANSMISSION
1 TEST OPTIONS
KNOWN INFO
I
MULTIMETER
NO LEAKS
FLUID OK
SHIFTER OK
CHECK VOLTAGE ON HARNESS
LEADS TO TRANSMISSION CHECK
LAMP. DID YOU GET:
>12 V ON PIN 1 (CKT 657B)?
0 V ON PIN 2 (CKT 657A)?
POSSIBLE
PROBLEMS
1
REASON FOR QUESTION
Transmission check lamp or
harness leads may be faulty.
TRANSh’!XION
0 YES
t
83
1
TEST OPTIONS
POSITION SWITCH TO ON. DOES
THE TRANSMISSION CHECK LAMP
FLASH THREE CODE 12s
INDICATING THE TCM IS CAPABLE
OF DIAGNOSTICS?
SEE FLOWCHART
AT RIGHT.
KNOWN INFO
NO LEAKS
FLUID OK
SHIFTER OK
POSSIBLE
PROBLEMS
REASON FOR QUESTION
Transmission check lamp must
flash three code 12s indicating the
TCM is capable at diagnostics.
TRANSMISSION
2-392
