Section 4
TROUBLESHOOTING
CHARTS
E.
CODE 37-
FUEL PRESSURE SENSOR
(FPS) SIGNAL
VOLTAGE
HIGH
NOTE — This chart IS only to be used If
1 )
All base mechanical checks and physical inspection have been performed with no problem found and
2) Diagnosis of DDEC-II was started at step Start-1 (page 3- 121) and you have now been referred here.
37-1 Mutiple Code Check
ere
there any other active codes
beside
Code 37?
37-2
Sensor
Check
l Turn ignition off.
l Disconnect
FPS connector.
l Turn ignition on,
l Start and run engine
l Select Engine Temperature
(Mode
13 COOLANT
TEMP or 18 OIL
TEMP) on the DDR.
l Warm Up engine until
engine
temperature
reading
is greater
than 60 degrees
C
(140 degrees
F)
l Leave engine running at idle after
warm up.
l Read active codes.
37-3
Return Circuit Check
l Turn ignition off.
. Disconnect
the engine
harness
connector
at the ECM
l Install a jumper wire between
pins
A and B of the FPS harness
connector.
l Read resistance
between
sockets
M 1 and Y2 on the engine
harness
connector.
No other codes.
Yes, any or all
of the following codes:
14-15,23,33-36,38.
Yes - but none
of the above.
Code 38 (and any
codes
except
Code 37).
Code 37 (and any
other codes).
Less than or
equal to 5 ohms.
Greater
than
5 ohms or open.
TM9-2320-383-20-1
I
WHAT TO DO NEXT
Go to 37-2
GO to ENG5V-1 (page 3-333).
Go
to 37-2
Go
to 37-3
Go
to 37-5
Go
to 37-4.
Return
line (ckt #452)
is open.
Contact Direct Support.
3-277
