APRILIA SHIVER 900 Service Station Manual page 162

Electrical system
Rear coils:
The secondary injection relay (no. 35 in the electrical circuit diagram, placed under the fuel tank, on the
right side of the filter housing. However, CHECK the relay identification with the cables colour - blue
taping) for 5 seconds and the violet/grey coil cable is closed to ground for 2 ms per each second. It is
recommended to disconnect the 4-way connector of the fuel pump to be able to hear the relay and
injector activation. Electrical continuity is required in the wiring for the relay to activate correctly: no
errors are generated in case of no activation.
DIAGNOSTIC TOOL: ELECTRICAL ERRORS
P0351 Front coil
Electrical diagnosis:
short circuit to positive / short circuit to negative, open circuit.
Error cause:
•
Short-circuit to positive: an excessive voltage was detected at PIN 28 of the ENGINE con-
nector.
•
If open circuit, short circuit to negative: a voltage equal to zero was detected at PIN 28 of
the ENGINE connector.
Troubleshooting:
•
Short-circuit to positive: disconnect the coil connector, turn the key to ON, activate the coil
with the diagnostic tool and check the voltage at PIN 28 of the connector: if there is voltage,
restore the wiring harness, if the voltage is 0, replace the coil.
•
If open circuit, short circuit to negative: check the electrical characteristics of the coil: if not
ok, replace the coil; if ok, perform the check procedure for the coil connector and for the
Marelli control unit connector; if not ok restore; if everything is ok, check the continuity of the
cable between the two ends of the cable: if there is no continuity, restore the wiring harness;
if there is continuity, with key ON, check the cable ground insulation (from the coil connector
or control unit connector); if not ok, restore the wiring harness.
P0352 Rear coil
Electrical diagnosis:
short circuit to positive / short circuit to negative, open circuit.
Error cause:
•
Short-circuit to positive: an excessive voltage was detected at PIN 27 of the ENGINE con-
nector.
•
If open circuit, short circuit to negative: a voltage equal to zero was detected at PIN 27 of
the ENGINE connector.
Troubleshooting:
ELE SYS - 162
SHIVER 900