renesis
8th March, 2011, 03:57 PM
Hi, I have a Volvo B12M bus with D12D engine, Knorr EBS, Knorr ELC, EGS gearbox.
I am unable to start the bus with the ignition key switch. The ignition switch is working well as it is connected to the VECU showing the correct signal when turned to "start" position.
If I short the starter motor the bus can start, or if I short the IOA module ( a certain pin ) to 24V I can start the bus.
The following are the items checked
1) Rear start (engine compartment start) - all functional
2) Neutral gear position sensor - functional and correct
3) Ignition switch is fine
4) Relays are all working fine
5) Supply +30 and Ignition 15 are all ok
6) CAN J1939 and J1708 lines are all connected well with no breaks
I have tried connecting VCADS to this vehicle,but am not able to get any information. VCADS hangs at "Collecting vehicle information... 30%". It seems as though my VCADS cannot access all the other ECUs (including EECU, EBS, ELC, VECU..etc)
The funny thing is, I can view the ECUs' ID and part number through the instrument cluster.
Another same vehicle B12M (same specs) I have no problems with VCADS identifying and diagnosing it.
What other checks should I perform?
Any advice will be greatly appreciated.
Thank You
I am unable to start the bus with the ignition key switch. The ignition switch is working well as it is connected to the VECU showing the correct signal when turned to "start" position.
If I short the starter motor the bus can start, or if I short the IOA module ( a certain pin ) to 24V I can start the bus.
The following are the items checked
1) Rear start (engine compartment start) - all functional
2) Neutral gear position sensor - functional and correct
3) Ignition switch is fine
4) Relays are all working fine
5) Supply +30 and Ignition 15 are all ok
6) CAN J1939 and J1708 lines are all connected well with no breaks
I have tried connecting VCADS to this vehicle,but am not able to get any information. VCADS hangs at "Collecting vehicle information... 30%". It seems as though my VCADS cannot access all the other ECUs (including EECU, EBS, ELC, VECU..etc)
The funny thing is, I can view the ECUs' ID and part number through the instrument cluster.
Another same vehicle B12M (same specs) I have no problems with VCADS identifying and diagnosing it.
What other checks should I perform?
Any advice will be greatly appreciated.
Thank You