•
short circuit to positive / short circuit to negative / open circuit, overvoltage, excessive internal
temperature.
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 29 - 41. If shorted to
negative: no voltage has been detected. If the circuit is open: an interruption or excessive
ampere input or control unit overheating has been detected
Troubleshooting
•
If shorted to positive: disconnect the throttle body connector, set key to ON and check volt-
age at PIN 3: if the voltage read is higher or equal to 5V, there is a short circuit on the cable
harness; replace the throttle body if the voltage is null
•
If shorted to negative: disconnect the throttle body connector, set the key to ON and check
if PIN 3 is in continuity with the vehicle ground connection: if there is continuity, restore the
cable harness; if there is not continuity, replace the throttle body
•
If the circuit is open, there is overvoltage or excessive internal temperature: check the throttle
body connector and the control unit connector: if not OK, restore; if OK, disconnect the
throttle body connector and control unit connector and check if there is cables continuity; if
there is no continuity, restore the cable harness. If there is continuity, with the throttle body
connector connected, check that the resistance, from the throttle control unit connector,
between PIN 29 and 41 is within 1 and 2.5 Ohm; if it is not, replace the throttle body; if it is,
check that the throttle body is not mechanically blocked: if blocked, solve the problem and
replace the body; if it is not, replace the control unit
Front throttle control circuit P0186
•
short circuit to positive / short circuit to negative / open circuit, overvoltage, excessive internal
temperature circuit open
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 3 - 15. If shorted to neg-
ative: no voltage has been detected. If the circuit is open: an interruption or excessive
ampere input or control unit overheating has been detected
Troubleshooting
•
If shorted to positive: disconnect the throttle body connector, set key to ON and check volt-
age at PIN 3: if the voltage read is higher or equal to 5V, there is a short circuit on the cable
harness; replace the throttle body if the voltage is null
•
If shorted to negative: disconnect the throttle body connector, set the key to ON and check
if PIN 3 is in continuity with the vehicle ground connection: if there is continuity, restore the
cable harness; if there is not continuity, replace the throttle body
•
If the circuit is open, there is overvoltage or excessive internal temperature: check the throttle
body connector and the control unit connector: if not OK, restore; if OK, disconnect the
RSV4 R Electrical system
ELE SYS - 193
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