MOTO GUZZI 2Q000297 Service Station Manual page 137

V7 III ABS
1. Power supply (red/brown)
2. Ground (black/white)
Diagnostic tool - Parameters
•
Example value with key ON: 0 %
•
Example value with engine on: %
Used only at 0 or 100%
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING,
CAREFULLY READ THE GENERAL TROUBLESHOOTING
CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGIN-
NING OF THE CHECK AND CONTROL SECTION IN THE
ELECTRICAL SYSTEM CHAPTER.
Diagnostic tool - Activation
•
EV secondary air system
Diagnostics tool - Logic errors
Error cause
•
Possible malfunction
Troubleshooting
•
Disconnect the connector and check the resistance between PIN of the valve connector; if
the resistance value is close to 10-20 Ω the valve is ok, if the value of the resistance is equal
to 0 it can be said that there is a short circuit on the valve, instead if there is a resistance
equal to a ∞ this means that inside the valve occurs an open circuit; in both cases it is
necessary to replace the valve
Secondary air valve P0410 - shorted to positive / shorted to negative / open circuit
Error cause
•
Short-circuit to positive: excessive voltage measured at PIN 24 of the engine control unit
•
If shorted to negative/open circuit: no voltage has been detected. The instrument panel does
not indicate the presence of this error even in the ATT status.
Troubleshooting
•
Short-circuit to positive: disconnect the component, set the key to ON, start the vehicle and
check if the error symptom is still "shorted to positive": it means that short circuit is between
black/white cable and a cable in voltage, therefore restore wiring harness; if the error symp-
tom is short circuit to ground, it means that short circuit is inside the valve and therefore,
you must replace the component.
•
If shorted to negative or open circuit: check the component connector and control unit con-
nector: if not OK, restore; if they are OK, check the continuity of the black/white cable
between the two connectors: if not OK, restore wiring harness; if OK, with key ON, check if
Electrical system
ELE SYS - 137