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SHIVER 900
•
If open circuit, short circuit to negative: check the Marelli control unit connector and the
sensor connector; if NOT OK restore, if everything is OK, with key OFF, check the continuity
between Marelli control unit connector PIN 24 and the sensor connector PIN 3: if there is no
continuity, restore the wiring harness, if there is continuity, check the ground insulation of
the cable: if there is continuity to ground, restore the wiring harness, if there is no continuity,
check (with key in ON position) that there is a voltage of approx. 5 V present at PIN 1 on the
sensor connector: if NOT OK, turn the key to OFF and check the continuity between the
ENGINE connector PIN 25 and PIN 1 on the sensor connector: if NOT OK, restore the wiring
harness; if ok, replace the control unit; if a voltage of 5 V is present at PIN 1, check (with
key in ON position) for continuity between PIN 3 on the sensor connector and ground: if NOT
OK, restore the wiring harness; if OK, replace the sensor.
P1105 Rear cylinder air pressure sensor
Electrical diagnosis:
•
short circuit to positive / open circuit, short circuit to negative, signal not plausible.
Error cause
•
Short-circuit to positive: excessive voltage detected at PIN 49 of the Marelli ECU detected.
•
If open circuit, short circuit to negative: voltage equal to zero detected at PIN 49 of the Marelli
ECU.
This error is indicated by lighting up in a fixed manner the MI warning light.
Troubleshooting
•
Short-circuit to positive: verify that the parameter of the rear cylinder air Pressure Sensor
on the diagnosis instrument is approx. 1200 mbar; disconnect the sensor connector: if the
value does not change, this means there is a short circuit in the cable between the Marelli
control unit connector and the sensor connector; restore the wiring harness; if the value
changes, replace the sensor.
•
If open circuit, short circuit to negative: check the Marelli control unit connector and the
sensor connector; if NOT OK restore, if everything is OK, with key OFF, check the continuity
between Marelli control unit connector PIN 49 and the sensor connector PIN 3: if there is no
continuity, restore the wiring harness, if there is continuity, check the ground insulation of
the cable: if there is continuity to ground, restore the wiring harness, if there is no continuity,
check (with key in ON position) that there is a voltage of approx. 5 V present at PIN 1 on the
sensor connector: if NOT OK, turn the key to OFF and check the continuity between ENGINE
connector PIN 25 and PIN 1 on the sensor connector: if NOT OK, restore the wiring harness;
if OK, replace the control unit; if a voltage of 5 V is present at PIN 1, check (with key in ON
position) for continuity between PIN 3 on the sensor connector and ground: if NOT OK,
restore the wiring harness; if OK, replace the sensor.
DIAGNOSTIC TOOL: LOGIC ERRORS
Electrical system
ELE SYS - 143
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