Service manual

© 2002 Cannondale Corporation - All Rights Reserved
18
Electrical_EFI Service Manual.fm
and the wiring is in good condition. Make sure the
boots are in place.
Check for voltage at the pump when the start
button is pressed. Check for any open or short
circuit conditions in the fuel pump circuit. Consult
the vehicle wiring diagram. Take corrective action
if necessary.
Quick connect fuel fittings - Make sure the O-rings
are in good condition. Damaged O-rings can
result in pressure loss or the introduction of air
into the fuel lines reducing developed fuel
pressure. The fittings have an internal and
external O-ring. External O-rings can be checked
visually. Fuel flow can be restricted or stop is the
internal O-rings are swollen or damaged.
2. Replace the fuel filter to assure adequate fuel flow
to the pump.
CAUTION:
Do not perform this test with unfiltered fuel;
severe damage can occur to the pump or fuel
injectors.
3. Fill fuel tank with the specified fuel as required.
4. Hold a clean rag around the regulator inlet and
loosen the hose clamp to relieve any residual fuel
system pressure.
5. Install a T-fitting and fuel pressure gauge between
the regulator inlet and hose coming from the
injectors. Make sure the return line attached to
the regulator outlet is connected to the fuel tank-
tank.
6. Start the engine and read the generated fuel pres-
sure.
If the fuel pressure reading is OK, the pump and
regulator are OK.
If the fuel pressure reading is low, quickly discon-
nect and reconnect the fuel tank return line, if the
fuel pressure reading increases when the return
line is disconnected, the regulator is faulty replace
it.
If the fuel pressure does not increase, replace the
pump and regulator.
SERVICE: Fuel pressure
3.0 ± .25 bar
Dynamic Test - Voltage test
1. First, use a multi meter to check for battery
voltage to the pump at the (+) fuel pump terminal.
2. Use an Ohmmeter. Connect the positive lead to
main harness connector CN16 pin B. Connect the
negative lead to ground. Have an assistant turn
the ignition switch “ON”. Press the engine start
button and release it.
If there is continuity, the pump harness circuit is
OK.
If there is no continuity, disconnect the ECU and
check for continuity between CN16 pin B and
ECU connector pin P1 H1. There should be conti-
nuity. Take corrective action and repeat step 2.
If no continuity is present between CN16 pin B
and P1 H1 after the circuit is corrected, replace
the ECU (It is not switching the pump circuit to
ground).
WARNIN
G
Gasoline is extremely flammable and is
explosive. Handle with extreme care!
When inserting a pressure gauge into the
fuel system, make sure all hose connec-
tion are secure. Make sure the fuel tank
outlet and inlet lines are connected prop-
erly to the tank.