Watch the fuel pump pressure while slowly
accelerating the engine from idle to maximum speed.
The pressure should always be greater than zero. If
you can drive the vehicle while measuring the
pressure, check to be sure it is still above zero even
during maximum acceleration (maximum engine
power). You can use STUICE-R
test 24 with control
function 02 (minimum).
the engine with the
in neutral doesnt work for this
engine because the fuel supply cant increase as
fast as the engine can accelerate so you wont
get good test results.
Proper engine performance depends
upon the availability of the correct fuel
volume to the injection pump.
Pay attention to when the engine runs rough.
runs rough only while warming up after a cold start, it
may be a glow plug problem and you should run the
Glow Plug Circuit tests.
Rough running may also be caused by air leaks in the
fuel supply lines. Air in the fuel should purge itself
while idling. If rough running occurs after a period of
high speed or high power running but seems to go
away after idling, then look for air leaks in the fuel
supply lines and fittings. If rough running occurs while
driving but idles ok, check the fuel return check valve
for any malfunctions (para. 3-36).
Try to adjust the engine idle speed by
turning the idle speed screw (para. 3-45).
Continue testing if you can adjust the
If you cannot, notify
DS maintenance (chapter 14).
Engine must be at normal operating temperature
when making speed checks. Air filter must be in
place and all accessories (lights, heater fan, etc.)
must be turned off.
Thts engme has a min-max governor which controls
engine speed at both idle and full thronle.
FUEL PUMP VOLUME TEST
1. Disconnect fuel line at injection pump inlet
and route fuel line into a suitable 1 quart
(1 liter) container.
2. Crank the engine for 30 seconds.
3. If the pump and lines are ok, you should gE
about 1 pint (l/2 quart) (.5 L) in 30 second5
FUEL PUMP PRESSURE
STE/lCE-R TEST 24
already connected to DCA and
1. Select Fuel Supply Pressure test,
2. Perform CAL.
3. Crank (or start) the engine.
NOTE : STE/ICE-R can display a pressure
below 0. Be sure to notice if the display is
FUEL PUMP PRESSURE TEST
1. Connect a tee into the fuel line between
the fuel filter outlet and the injection
2. Attach gauge to tee.
3. Crank (or start) engine.
STEIICE-R TEST 10
1. Start Test 10. Engine RPM.
2. Crank or start the engine. Displayed
reading is RPM. Cranking rpm should
be at least 100 rpm. Idle rpm
should be 700-750.