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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART -2 - ENGINE CRANKS BUT WILL NOT START (Cont’d)
STEP/SEQUENCE
C 2-8
Check SRS/TRS Gap
Remove ECM (para 7-29.1)
Turn camshaft counterclockwise
until the TRS is over a TRS
“tooth” of the pulse wheel.
Tap the front of the camshaft
rearward with a soft hammer (to
remove camshaft end play).
l Using a feeler gauge check
gap between the pulse wheel teeth
and TRS (nominal gap is
0.020” or 0.5 mm).
C 2-9
(Deleted)
C 2-10
Check Pulse Wheel
l Inspect DDEC pulse wheel for:
-Loose wheel.
-Chipped or missing teeth.
C 2-11
Check ECM Connectors
l Turn ignition off.
l Disconnect all connectors at the
ECM.
l Check terminal at all ECM
connectors (both the ECM and
harness side) for damage; bent,
corroded and unseated pins or
sockets.
RESULT
Incorrect gap.
Gap setting
is correct.
Pulse wheel OK.
Problem found.
Terminal and
connectors are okay.
Problem found.
WHAT TO DO NEXT
Loosen the screw at the top of
the TRS/SRS mounting bracket.
(Don’t touch the two screws that
go into the block front end
plate-they will affect engine
timing.) Adjust the TRS/SRS until
the gap setting is correct. Tighten
screw. (lf problems returns,
pulse wheel may be loose or
bad, notify supervisor.) Then go
to C 2-30.
Go to C 2-10.
Go to C 2-11.
Pulse wheel requires repair or
replacement. Notify supervisor.
Replace ECM (para 7-29.1).
Then go to C 2-30.
Repair terminals/connectors
(para 7-77). Then go to C 2-30.
H-47
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