Section 4
TM 9-2320-363-20-1
TROUBLESHOOTING CHARTS
D. CHART6. "CHECK ENGINE" LIGHT ALWAYS ON, NO DATA LINK AND WON’T FLASH CODES (Cent’d.)
C6-4 Check ECM
Connectors
l Turn ignition off.
l Check terminals at the vehicle
harness connectors (both the ECM
and harness side) for damage:
bent, corroded and unseated pins
or sockets. Pay special attention
to the terminals and sockets in the
6-pin power connector and
sockets B 1 and B3 of the 30-pin
vehicle harness.
C6-30 Verify Repairs
l Turn ignition off.
l Reconnect all connectors.
l Turn ignition on.
. Clear codes
l Turn ignition off.
l Turn ignition on while at the same
time observing the “’Check
Engine" light.
l If "Check Engine” light stays on.
read historical codes.
WHAT TO DO NEXT
Go to C6-30.
Repair terminals/connectors,
page 3-2. Then go to C6-30.
Repairs are complete.
Go to C4-1. Page 3-164.
All system diagnostics are
com plete Please review this
see: on from the first step to find
the error
Go to START-1, page 3-121, to
service codes.
3-175
