Section 4
TM 9-2320-363-20-1
TROUBLESHOOTING CHARTS
E. CODE 38 -FUEL PRESSURE SENSOR (FPS) SIGNAL VOLTAGE LOW (Cent’d.)
STEP/SEQUENCE
38.7 Check ECM
Connectors
l Check terminals at the ECM engine
harness connector (both the ECM
and harness side) for damage:
bent, corroded and unseated pins
or sockets. Especially WI, M 1
and Y2 terminals and pins at
ECM.
38.8 Check for Open + 5
Volt Line
l Turn ignition off.
l Disconnect the engine harness
connector at the ECM.
l Install a jumper wire between
sockets A and C of the FPS
harness connector.
l Read resistance between sockets
WI and Y2 on the engine harness
connector.
38.9 Check for Short
l Remove jumper wire.
l Read resistance between sockets
A and C of the FPS harness
connector.
RESULT
T e r m n a l s
a n d
connecters are okay
P r o b l e m f o u n d .
Less than or
equal to 5 ohms.
Greater than
5 ohms or open.
Less than or
equal to 10.000 ohms.
Greater than
10.030 ohms or open.
WHAT TO DO NEXT
-Replace ECM, page 4-191.
Then go to 38-30.
page 3-2. Then go to 38-30.
-Go to 38-9.
-The engine +5 Volt line (ckt
#41 6) is open. Contact Direct
support.
- The engine +5 Volt line (ckt
#416) is shorted to the return
line (ckt #452). Contact
Direct Support.
-Go to 38-12.
3-287
