APRILIA SHIVER 900, Service Station Manual

Page: 153 / 444

the switching from "HIGH RATIO" to "LOW RATIO" is missing for a certain"adjusted" number
of upper dead points (PMS or TDC).
The instrument panel indicates this error by lighting up in a fixed manner the MI warning light.
Troubleshooting:
•
If no switching from high: the fault may be generated in the supply system (poor pin sealing)
or in the probe. Check the wiring harness. if NOT OK restore; if OK, replace the lambda
probe.
•
If no switching from low: the fault may be generated in the supply system (dirty injector, low
fuel supply system pressure) or in the probe. Check the wiring harness. if NOT OK restore;
if OK, replace the lambda probe.
•
For the (non polarised) type of probes, this error may be caused also by a short circuit to
the wiring harness ground.
NOTE
THIS ERROR DISABLES THE RATIO CONTROL IN CLOSED LOOP.
(REAR CYLINDER)
Function
In charge of telling the control unit whether the mixture is lean or rich
Operation / Operating principle
The Marelli injection control unit reads and interprets a voltage generated by the difference in oxygen
content between the exhaust fumes and the ambient. It does not require an external supply source but,
in order to work properly, it should reach a high operating temperature: that is why there is a heating
circuit inside
Level in electrical circuit diagram:
Lambda probe
Position:
•
on manifold: on the rear part of the vehicle in correspondence with the shock absorber
•
connector: on the left side, between the rear cylinder an the frame (4 way black connector)
Electrical specifications
•
Heater circuit: 7-9
Ω
at ambient temp.
Pin out:
1. Sensor (black wire)
2. Sensor signal - (grey wire)
3. Heater ground connection (white cable)
4. Heater power supply (white cable)
DIAGNOSTIC TOOL:PARAMETERS
Lambda probe
SHIVER 900
Electrical system
ELE SYS - 153