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 MIU system 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 see whether the malfunction can be fixed by shaking the connector slightly.
3 Check the entire system before replacing the MIUIf the fault is fixed by replacing the MIU control unit,
install the original control unit again and check if the fault occurs again.
4 When troubleshooting use a multimeter with an internal resistance over 10 Ohm /V. Instruments that
are not suitable might damage the MIU control unit. Instruments must be used with definitions over 0.1V
and 0.5 W , the precision must be greater than 2%.
Terminals setup
TERMINAL LAYOUT
Specification Desc./Quantity
1 Injection warning light
2 Rpm indicator signal
3 Can «L» Line
4 - Lambda probe
5 + battery under permanent power supply
6 + Battery
7 Immobilizer aerial
8 Electric fan starter
Injection MP3 400 i.e.
INJEC - 6
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