P1602 code on toyota vitz 2006. Please help

[volkan.rulex]

I am getting p1602 on my obd reader but check engine light is off. Please tell me the solution. Have changed the battery.

[volkan.rulex]

[ahmedstudio]

Low voltage to ECM.

Was the battery properly charged before installation?

[volkan.rulex]

Yes I checked it by myself. It was fully charged

[volkan.rulex]

control module voltage is 13.5. Is that normal or low on idle ?

[ahmedstudio]

If its a 12V battery vehicle, then the ECU is likely to work from 9V until 14V with no issues. That is the usual requirement. So 13.5 is alright.

What make is the vehicle? I believe its a KIA or an Audi...?

Meanwhile, disconnect the battery terminals, switch on headlights to run down any current left, short out the ECU by touching battery terminals with eachother (while the battery is unplugged), clean the OBDII Port pins with Contact Cleaner/Injector Spray. Let it dry for 15 minutes. Reconnect battery terminals, check if there's any corrosion. Apply petroleum jelly on battery terminals. Check wiring from alternator and ground connections. @volkan.rulex

[volkan.rulex]

Its toyota vitz 2007 with 1kr engine

[volkan.rulex]

I believe that the alternator is weak. What do you say ?

[ahmedstudio]

Service the alternator.

[volkan.rulex]

Servicing done today. Lets hope that the code does not come back..

[ahmedstudio]

disconnect the battery terminals, switch on headlights to run down any current left, short out the ECU by touching battery terminals with eachother (while the battery is unplugged), clean the OBDII Port pins with Contact Cleaner/Injector Spray. Let it dry for 15 minutes. Reconnect battery terminals, check if there's any corrosion. Apply petroleum jelly on battery terminals.

Do the above mentioned too @volkan.rulex