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Connectors
and Wiring
1. Check for engine hesitations caused
by loose contacts by moving the wiring
harnesses and watching for changes in
the rpms.
2. Check wires 5, 6, 17, and 49 for
proper continuity to ground.
Voltage
Supply
1. Inspect and check that the harness
plugs for the dual relays are in good
condition.
2. Verify that there are no voltage
drops due to high resistance contacts
in the relays or wiring.
Cold Start Valve
1. Verify the cold start valve functions,
paying careful attention for leaks when
running.
Alternator
and Regulator
1. With the engine stopped, remove the
plug from the alternator. Start the
engine. If this eliminates the engine
misses, check the alternator and
regulator.
Fuel Quantity
Cold Start Valve
1. Detach the fuel line at the cold start
valve and hold the hose inside a 5 liter
container that has a graduated scale.
2. With the ignition switch in the on
position, operate the air flow sensor
flap by hand and start the fuel pump.
3. After 1 minute, the fuel quantity
should measure 1.5 – 2 liters.
4. If the quantity is not correct, check
for clogged fuel filter, pinched or
clogged lines, pressure regulator, and
fuel pump.
Fuel Quantity
Injection Valves
1. Remove one valve at a time and
inject fuel into a graduated container.
2. Measure each injection valve for 30
seconds.
3. Compare the results and determine
if any valves are not providing
consistent quantities of fuel.
Air Flow Sensor
1. Verify operation of air flow sensor
Control
Unit
1.Connect tachometer and operate
engine.
2. Move the multiple plug connector
and tap on the control unit.
3. Determine if engine hesitates during
this process.