Start-up system check
Function
Communicates to the control unit the will to start-
up the engine.
Operation / operating principle
Press the start-up button to close the specific cir-
cuit taking the PIN 58 of the control unit to a voltage
equal to zero (ground closing).
Level in wiring diagram:
Start-up signal
Location:
•
on the vehicle: right light switch.
•
connector: inside the bow (4-ways
black).
Electrical characteristics:
•
key released: the circuit is open
•
key pressed: the circuit is closed
Pin out:
2: voltage + 5V
3. ground
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.
DIAGNOSIS INSTRUMENT: ELECTRICAL ERRORS
Starter switch P0170
•
shorted to positive / open circuit, shorted to negative.
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 58; if the circuit is open,
shorted to negative: voltage equal to zero has been detected.
DIAGNOSIS INSTRUMENT: LOGIC ERRORS
Starter switch P0169
•
signal not valid.
Error cause
•
Fault in the switch (lock) of the engine start-up. The instrument panel does not indicate the
presence of this error even in the ATT status.
Troubleshooting
RSV4 R Electrical system
ELE SYS - 141
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