3-335
Section 4
TROUBLESHOOTING CHARTS
E. ENG5V - ENGINE HARNESS + 5 VOLT SUPPLY (Cent’d.)
STEP/SEQUENCE
ENG5V-5 Check for Short to
Ground
l Turn ignition off.
l Remove jumper wire.
l Read resistance between sockets
A and C of the sensor connector.
l Also read resistance between
socket C of the sensor connector
and a good ground.
ENG5V=6 Check for Short to
Battery +
l Turn ignition off.
l Remove both fuses to the ECM.
. Disconnect all five connectors at
the ECM.
l Read resistance between socket
W1 on the engine harness
connector and B3 on the vehicle
harness connector.
l AISO read resistance between
socket W1 on the engine harness
connector and the following
sockets on the 6-way power
harness connector: A, B, E and F.
L e s s t h a n o r —
equal to 5 ohms.
Greater than
5 ohms or open.
Both readings are
greater than 10,000
ohms or open.
Either reading is —
less than or equal
to 10,000 ohms.
A l l r e a d i n g s a r e
greater than 10,000
ohms or open.
A n y r e a d i n g i s —
less than or equal
to 10,000 ohms.
TM 9-2320-363-20-1
WHAT TO DO NEXT
(ckt #416) or the sensor return
line (ckt #452) is open.
Contact Direct Support.
- The engine +5 volt line (ckt
#41 6) is shorted to either the
sensor return line (ckt #452) or
to chassis ground. Contact
Direct Support.
- A short exists between sockets
where less than 10,000 ohms
resistance was read. Contact
Direct Support.
