APRILIA RSV4 RR 2017 Service Station Manual page 155

RSV4 RR-RF
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short circuit to positive:check the value indicated by the parameter handle position sensor
track B: disconnect the connector and read the value indicated by the diagnostic tool: if the
voltage does not vary, there is a short circuit on the wiring harness of the relative cable, if
the voltage goes to zero, replace the handle sensor.
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open circuit, short circuit to negative: check the handle sensor connector and Marelli control
unit connector, if not ok restore, if ok check cable continuity between the two terminals, if
not ok restore, if ok check the ground insulation of the cable (from the handle sensor con-
nector or control unit connector): if not ground insulated, restore the wiring harness, if ground
insulated check, with key ON, that power supply is present at PIN 4 of the potentiometer
and that the ground is present at PIN 5, if present correctly replace the handle sensor, if not
present check the continuity of the malfunctioning cable: if the continuity is present replace
the control unit, if not present replace the wiring harness
DIAGNOSTIC TOOL: LOGIC ERRORS
P1227 Tracks A-B handle position sensor
Functional diagnosis:
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Signal not congruent
Error cause:
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Detected two voltages signals at PIN 39 and 13 of the ENGINE connector (tracks A-B)
This error is indicated by flashing the general warning light and by lighting up in a fixed manner the MI
warning light.
Troubleshooting:
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Check the parameters for the track A and track B Handle position sensor. The values de-
tected on track A must be comprised between 1 V (gas throttle completely closed) and 4 V
(gas throttle completely open). The values detected on track B must be comprised between
0.5 V (gas throttle completely closed) and 2 V (gas throttle completely open). If one of these
values differs significantly from the indicated value, it means that the potentiometer is faulty.
check the handle sensor connector and control unit connector; if not OK, restore. If OK,
check that cable resistance between the handle sensor cable and the control unit is a few
tenths of Ohm; otherwise, restore the wiring harness; if ok, replace the complete handle
command.
Electrical system
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