APRILIA DORSODURO FACTORY ABS 2011 Service Station Manual page 139

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DORSODURO FACTORY ABS
•
Shorted to positive: disconnect the probe connector and check the sensor correct resistance:
replace the sensor if not OK; if it is OK, restore the cable harness.
•
circuit is open, shorted to negative: check the continuity from probe connector (PIN 3 and
4) towards the probe: if not OK, replace the probe; if it is correct, check the sensor connector
and the Marelli control unit connector. If not OK, restore. If OK, and with key set to ON and
sensor connector disconnected, check if there is battery voltage at PIN 4: if not ok, check
the red/black cable between the probe connector and the auxiliary injection relay (No. 40 in
the wiring diagram, located under the fuel tank, right side, second relay starting from the
front; CHECK, however, the identification of the relay with the colour of the cables). If there
are also coil and injector errors, check the relay and its excitation and power line; if there is
voltage at PIN 4, check the grey/blue cable ground insulation (PIN 3): if not OK, restore the
cable harness. If it is OK, check the continuity of the grey/blue cable (between the sensor
connector PIN 3 and the ENGINE PIN 32) and restore the cable harness.
NAVIGATOR: LOGIC ERRORS
Lambda probe P0134 - voltage without variation.
Error cause
•
An abnormal behaviour of the voltage at PIN 43 of the ENGINE connector has been detec-
ted: the voltage, that should vary over time, keeps a constant value instead.
Troubleshooting
•
Check circuit continuity from probe connector (PIN 1 and PIN 2) toward the probe: replace
the lambda probe if there is no continuity; if there is continuity, check the sensor connector
and the Marelli control unit connector: If not OK, restore. If OK, check continuity between
the ENGINE connector PIN 43 and PIN 60 and restore the cable harness.
CAUTION
IN CASE THE Lambda sensor correction PARAMETER, WITH ENGINE AT IDLE AND H2O T >90
°C, WHICH IS NOT WITHIN THE 0.9 - 1.1 RANGE, WITHOUT ERRORS, CHECK:
- IF < 0.9, THE PROBE READS LEAN COMBUSTION CONDITIONS AND THE CONTROL UNIT
INCREASES INJECTION TIME; CAUSES: CHECK FOR INCORRECT AIR INTAKE, LITTLE PET-
ROL, RUSTY TERMINAL CONTACTS, DEFECTIVE PROBE.
- IF > 1.1, THE PROBE READS RICH COMBUSTION CONDITIONS AND THE CONTROL UNIT RE-
DUCES INJECTION TIME; CAUSES: LITTLE AIR, EXCESSIVE PETROL, DEFECTIVE PROBE.
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Electrical system
ELE SYS - 139