Troubleshooting hints
1An EMS failure is more likely to be due to the connections than to the components.
Before troubleshooting the EMS, carry out the following checks:
A: Electrical power supply
a. Battery voltage
b. Blown fuse
c. Remote controls
d. Connectors
B: Chassis earthing
C: Fuel supply
a. Broken fuel pump
b. Dirty fuel filter
D: Ignition system
a. Faulty spark plug
b. Broken coil
c. Broken shielded cap
E: Intake circuit
a. Dirty air filter
b. Dirty by-pass circuit
c. Faulty Stepper motor
F: Other
a. Incorrect distribution timing
b. Wrong idle mixture
c.Incorrect reset of the throttle valve position sensor
2 EMS faults may be caused by loose connectors. Make sure that all connections have been correctly
made.
Check the connections as follows:
A check that the terminals are not bent.
B check that the connectors have been properly connected.
C check whether the malfunction can be fixed by shaking the connector slightly.
3 Check the entire system before replacing the EMS control unit.If the fault is fixed by replacing the
EMS control unit, install the original control unit again and check whether the fault occurs again.
4 Use a multimeter with an internal resistance of more than 10K when troubleshooting. Ohm /V. In-
struments that are not suitable might damage the EMS control unit. Instruments must be used with
definitions over 0.1V and 0.5 W ; precision must be greater than 2%.
GP 800 i.e. Injection
INJEC - 5
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