Electrical System Shuts Down

[jake1m]

Hi Knowledgeable Mechanics,

The electrical system in my 2007 Volvo VNL 670 with a D12 engine shuts down every ten minutes or so. The system shuts down both when the engine is running and also when the engine is not running but the key is turned on and the electrical system is on. I installed a new egr cooler and valves but I don’t think it is related. Any ideas would be greatly appreciated.

Codes are:
MID 128 PID 100 FMI 3
MID 128 PID 84 FMI 9
MID 128 PID 171 FMI 9
MID 128 SID 146 FMI 5
MID 128 SID 230 FMI 5
MID 144 PSID 205 FMI 9

ROAD SPEED DATA ERATIC
IDLE VALIDATION SWITCH
ENGINE OIL PRESSURE
AMIENT AIR TEMP COMMUNICATION ERROR
ELECTRICAL FAULT
SAE J1939 DATA LINK DATA ERATIC

Thanks for your help,

Jake

 

[Vetech63]

Most all of those look like electrical signal problems. Have you checked the connections around the engine and transmission?

 

[jake1m]

Thanks for your reply. I have not. I will soon. I ordered a new/used VECU- Vehicle Control Unit... A few of the codes suggest it might have something to do with that unit... Thanks again.

 

[terex herder]

troubleshooting checklist for today's equipment:
1. connections
2. connections
3. connections
4. wiring
5. everything else

 

[jake1m]

thanks I will go through them all as best I can...

 

[mekanik]

It sounds like a data bus communication problem. Do you have a digital multimeter?
Measure between the J1939 data wires on the diagnostic connector connector in the cab.
The resistance between the wires should be close to 60 Ohms. Measure between
the data wires and a good ground. You should have close to 2.5 volts on each wire.
One should be slightly higher than the other.

There is a "Pass-through Panel" on the drivers side of the firewall. Make sure
all the ground wires that are on he bolts holding the panel in place have a good
connection. There is a positive and negative power connector on the panel.
I have seen the studs break on the panel causing an intermittent connection.
Make sure they are clean and tight. Check all the battery connections and power
and ground connections at the started and engine block.

Have a good look for a damaged spots and corroded wires on the wiring harnesses
under the hood.

 

[jake1m]

Thanks for your help... I do have a multi meter. I will do all the things you recommended and see if I have any luck...thank you.

 

[jake1m]

It sounds like a data bus communication problem. Do you have a digital multimeter?
Measure between the J1939 data wires on the diagnostic connector connector in the cab.
The resistance between the wires should be close to 60 Ohms. Measure between
the data wires and a good ground. You should have close to 2.5 volts on each wire.
One should be slightly higher than the other.

There is a "Pass-through Panel" on the drivers side of the firewall. Make sure
all the ground wires that are on he bolts holding the panel in place have a good
connection. There is a positive and negative power connector on the panel.
I have seen the studs break on the panel causing an intermittent connection.
Make sure they are clean and tight. Check all the battery connections and power
and ground connections at the started and engine block.

Have a good look for a damaged spots and corroded wires on the wiring harnesses
under the hood.

I checked the pass through panel on both sides...send pictures so you know we are on same page on location....no luck yet...

Another question... I have an old qualcomm I do not use because only need truck for local....I it possible to disconnect it myself?

 

[stinky64]

Picture 0186 shows the pass through panel, on the top left is a thicker wire,17A that is the power in for your engine management fuses/relay ..check that wire down to the batteries there should be a fused red wire to the + side check that fuse/ holder for melting or bad connection, also check the white wire to the - terminal especially the eyelet on the - terminal...truck off key on, RADIO OFF so you can hear, follow that red wire up the harness to the connector where it turns to a black 17A wire and wiggle the crap out of the connector and harness listening for the engine fan solenoid or something in the engine management to start clicking on and off while wiggling harness and connector. Make sure you have a full head of air so the fan solenoid works. Then turn the key off and check the connector for greenies..check all of the grounds above the passthrough connector on the firewall and inside the fire wall, also check both engine management fuses I think 70 + 72 for good connection , I have also seen the engine management relay in the fuse panel get super hot if the battery box fuse was overfused, so with key on wiggle the engine management relay and listen for telltale clicking, then try wiggling with truck running and see if it craps out..pull the relay out and check for all the terminals to be present and tight.....That round harness below the pass thru is just for abs so don't worry about that one....It's been a while but most of the ecu/engine problems on that vintage of Volvo with D12 I dealt with were there somewhere.....Oh yeah check the connector and grounds on the engine Ecu itself for obvious problems too...

 

[mekanik]

The Qualcomm system has both data links in the cable. The Qualcomm system
could be the problem. You should be able to follow the cables and disconnect it.
It should have an antenna as well that may have the data link running to it.
Follow both cables and disconnect them.
I had a Volvo VNL come in the shop last year with no functioning engine gauges
in the instrument panel. The J1708 data wires were shorted together. The installer
ran the cable to the antenna under the floor mat in the sleeper right under the hot
air vent from the sleeper heater. The insulation on the wire deteriorated from the heat
over the years and crumbled letting the wires touch. I was surprised that Volvo would
use the J1708 data link to run the gauges and not the J1939.

 

[jake1m]

The Qualcomm system has both data links in the cable. The Qualcomm system
could be the problem. You should be able to follow the cables and disconnect it.
It should have an antenna as well that may have the data link running to it.
Follow both cables and disconnect them.
I had a Volvo VNL come in the shop last year with no functioning engine gauges
in the instrument panel. The J1708 data wires were shorted together. The installer
ran the cable to the antenna under the floor mat in the sleeper right under the hot
air vent from the sleeper heater. The insulation on the wire deteriorated from the heat
over the years and crumbled letting the wires touch. I was surprised that Volvo would
use the J1708 data link to run the gauges and not the J1939.

I was able to disconnect the QUALCOMM like you advised. I think this was the problem. The truck seems to be driving well now without shutting down every ten minutes or so.... Thanks again for your help. I really appreciate it.

 

[jake1m]

Most all of those look like electrical signal problems. Have you checked the connections around the engine and transmission?

I think the problem was the old Qualcamm...I was able to disconnect it because only use truck for local... thanks for your help.