Section 4
TM 9-2320-363-20-1
TROUBLESHOOTING CHARTS
E. CODE 38- FUEL PRESSURE SENSOR (FPS) SIGNAL VOLTAGE LOW (Cent’d.)
38.1 O Check for Short to
Battery +
l Remove both fuses to the
ECM.
l Disconnect the vehicle harness
and 6-way power harness
connectors at the ECM.
l Read resistance between socket
M 1 of the engine harness
connector and socket B3 of the
vehicle harness connector.
l Also read resistance between
socket M 1 on the engine harness
connector and the following
sockets on the 6-way power
harness connector: A. B. E and F.
38-11 Check for Short on
Ground
l Turn ignition off.
l Remove jumper wires.
l Measure resistance between
sockets Ml and Y2 on the engine
harness.
38-12 Replace FPS
l Turn ignition off.
l Replace FPS.
l Reconnect all connectors.
l Turn ignition on.
l Clear Codes.
l Start engine. Run until “Check
Engine” light comes on or for one
minute.
RESULT
I
WHAT TO DO NEXT
All readings are
Go to 38-12.
greater than 10,000 ohms
or open.
Any reading is
A short exists between the
less than or equal to
sockets where less than 10,000
10,000 ohms.
ohms resistance was read.
Repair short, page 3-2, and
reinsert fuses. Then go to 38-30.
Greater than
Go to 38-6.
10.000 ohms.
Less than or
Signal line (ckt #905) and return
equal to 10.000 ohms.
line (ckt #952) are shorted
together. Contact Direct Support.
‘. Check Engine”
Go to 38-7.
light comes on.
“.Check Engine”’
Go to 38-30
light does not
come on.
3-289
