1. Neutral S/W
If clutch S/W signal is ON, this signal is sent to ECM which monitors cltuch operation. That is used to monitor driving and shifting. ECM starts engine by controlling starter relay if clutch signal is ON at idle stop.
ECM sets DTC P0820 if neutral gear switch is ON for more than 4 sec. while clutch switch is on and engine rpm changes. In this case, Idle stop function is not performing by ECM.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal check, low
Poor connection
Neutral S/W circuit
Neutral S/W
Enable Conditions
No misfire detection
Clutch torque > 20%
Delta engine speed > 40rpm/segment
Threshold Value
Netral postion sensor signal ON
Diagnostic Time
4sec
MIL ON Condition
DTC only(Idle stop forbidden)