MOTO GUZZI B043157 Service Station Manual page 137

Moto Guzzi California 1400
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Check circuit continuity from probe connector (PIN 1 and PIN 2) toward the probe: replace
the oxygen sensor 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 22 and PIN 10 and restore the cable harness.
'right cylinder lambda probe P0136
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shorted to positive
Error cause
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Excessive voltage (battery voltage) has been detected at PIN 9 and 38 of the ENGINE
connector. Caution: the 'Oxygen sensor' parameter is not the real value that is read; a re-
covery value is displayed instead. The instrument panel does not indicate the presence of
this error even in the ATT status.
Troubleshooting
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shorted to positive: with key set to ON, disconnect the sensor connector and measure PIN
1 voltage on the cable harness side (grey cable): if there is voltage (5 or 12 V), restore the
cable harness; if there is not, replace the oxygen sensor
'Heating right cylinder lambda probe P0141
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short circuit to positive/ open circuit, short circuit to negative
Error cause
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If shorted to positive: excessive voltage has been detected at PIN 38 of the ENGINE con-
nector. If the circuit is open, shorted to negative: voltage equal to zero has been detected
at PIN 38 of the ENGINE connector. The instrument panel does not indicate the presence
of this error even in the ATT status.
Troubleshooting
•
If shorted to positive: disconnect the probe connector and check the sensor correct resist-
ance: replace the sensor if not OK; if it is OK, restore the cable harness (Black cable)
•
If circuit is open, shorted to negative: check circuit continuity from probe connector (PIN 3
and 4) toward the probe: if it is not OK, replace the probe; if it is OK, check the sensor
connector and the Marelli control unit connector: if it is not OK, restore; if it is OK, with key
set to ON and sensor connector disconnected, check if there is battery voltage at PIN 4: if
it is not OK, check the Red/Brown cable continuity between the probe connector and the
auxiliary injection relay (No. 28 in the wiring diagram, placed in the front relay box, left side;
CHECK, however, the identification of the relay with the colour of the cables). If there are
also coil, lower and upper injector and secondary air errors, check the relay and its excitation
and power line; if there is voltage at PIN 4, check the Black cable ground insulation (PIN 3):
if not OK, restore the cable harness. If it is OK, check the continuity of the Black cable
Electrical system
ELE SYS - 137