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Electrical system
covery value is displayed instead. The instrument panel does not indicate the presence of
this error even in the ATT status.
Troubleshooting
•
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 Lambda probe
Oxygen sensor heating P0135
•
short circuit to positive/ open circuit, short circuit to negative
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 32 of the ENGINE con-
nector. If the circuit is open, shorted to negative: voltage equal to zero has been detected
at PIN 32 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 (green 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 orange/green cable continuity between the probe connector and the
injection relay (No. 33 in the wiring diagram, placed under the saddle next to the battery
positive, 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 ground insulation of the green
cable (PIN 3): if not OK, restore the cable harness. If it is OK, check the continuity of the
Green cable (between the sensor connector PIN 3 and the ENGINE PIN 32) and restore the
cable harness.
•
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 orange/green cable continuity between the probe connector and the
injection relay (No. 33 in the wiring diagram, placed under the saddle next to the battery
positive, CHECK, however, the identification of the relay (with the colour of the cables). If
there are also coil, injector and secondary air errors, check the relay and its excitation and
power line; if there is voltage at PIN 4, check ground insulation of the green cable (PIN 3):
ELE SYS - 182
TUONO V4 R a-PRC ABS
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