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Connectors
and Wiring
Voltage
Supply
Cold Start Valve
Alternator
and Regulator
Fuel Quantity
Cold Start Valve
Fuel Quantity
Injection Valves
Air Flow Sensor
Control
Unit
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.
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.
1. Verify the cold start valve functions,
paying careful attention for leaks when
running.
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.
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.
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.
1. Verify operation of air flow sensor
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.
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