APRILIA RS4 125 Service Station Manual page 121

RS4 125
Check
A tester can be used for the check. In every case
the continuity of the primary and secondary wind-
ings must be checked. The reading in ohms does
not need to be exact but, if the windings are intact,
their continuity must be detected with the resist-
ance values indicated above.
Function
Allows generation of the electrical discharge on
the spark plug, with an increase of voltage.
Pin-out:
1. Relay powered (PIN 3 relay side)
2. Activation by control unit (control unit side
PIN 1)
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING, CAREFULLY READ THE GENERAL TROU-
BLESHOOTING CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGINNING OF THE CHECK
AND CONTROL SECTION IN THE ELECTRICAL SYSTEM CHAPTER.
ELECTRICAL ERRORS
H.V. Coil P0351 - shorted to positive / open circuit or shorted to negative.
Error cause
Shorted to positive: excessive voltage at PIN 1 of the control unit connector.
Circuit open or shorted to negative: interruption of the circuit or null voltage at PIN 1 of the control unit
connector.
Troubleshooting
Shorted to positive:
•
Disconnect the coil connector, turn the key to ON and activate the component through the
diagnostics instrument.
•
Verify the presence of voltage on the coil connector PIN 2: if present, restore the cabling,
otherwise replace the coil.
The circuit is open:
•
Carry out the check procedure of the coil and control unit connectors.
•
Verify continuity of the cabling between the coil and control unit: Coil PIN 2 - control unit PIN
1. In the absence of continuity restore the cabling.
Electrical system
ELE SYS - 121