DIC low voltage
08-21-2014, 11:31 AM
#1
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
DIC low voltage
Hey all new long time lurker here
My DIC volt Meter is reading 11.0v (engine off) but checking at the battery or alternator shows 12.7ish. With the engine running, the DIC shows 12.5-12.8, but checking at the battery/alt I'm seeing 13.9-14.5
Ever since this issue popped up, I've had the dreaded ABS/TCS service lights come on intermittently. Code is 28-TCS C1255. All systems will function fine when the lights are off.
Found a broken wire at the EBCM plug and have fixed that with a new pin/wire.
Where do I start?
Thanks
My DIC volt Meter is reading 11.0v (engine off) but checking at the battery or alternator shows 12.7ish. With the engine running, the DIC shows 12.5-12.8, but checking at the battery/alt I'm seeing 13.9-14.5
Ever since this issue popped up, I've had the dreaded ABS/TCS service lights come on intermittently. Code is 28-TCS C1255. All systems will function fine when the lights are off.
Found a broken wire at the EBCM plug and have fixed that with a new pin/wire.
Where do I start?
Thanks
08-21-2014, 12:48 PM
#2
Race Director
Member Since: Apr 2007
Location: South Western Ontario
Posts: 11,061
Received 845 Likes
on
721 Posts
I would check the connections at the starter solenoid and the connection of the main lead from the battery positive to the under hood fuse stud.
If that doesn't pan out then I'd start checking the grounds next.
If that doesn't pan out then I'd start checking the grounds next.
08-21-2014, 01:19 PM
#3
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
I get battery voltage from battery + to all the grounds under the hood, and the power connection on the fuse block shows battery voltage when grounded, (I've thoroughly cleaned all the grounds with sandpaper.
08-21-2014, 03:00 PM
#4
Le Mans Master
Could be the electrical portion of the ignition switch. Common problem since the contacts carry a good bit of current and they can get burned and drop the voltage.
I can get you some info on how to test for that later when I get home. Some people clean the internal contacts or just replace it if that is the issue. I have that info too.
With regard to that code it is called the EBCM "code of death". I think it is separate from your specific voltage issue. Could be a connection issue but if not then it may be a much more serious issue.
What year is your car?
I can get you some info on how to test for that later when I get home. Some people clean the internal contacts or just replace it if that is the issue. I have that info too.
With regard to that code it is called the EBCM "code of death". I think it is separate from your specific voltage issue. Could be a connection issue but if not then it may be a much more serious issue.
What year is your car?
08-21-2014, 03:08 PM
#5
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
Could be the electrical portion of the ignition switch. Common problem since the contacts carry a good bit of current and they can get burned and drop the voltage.
I can get you some info on how to test for that later when I get home. Some people clean the internal contacts or just replace it if that is the issue. I have that info too.
With regard to that code it is called the EBCM "code of death". I think it is separate from your specific voltage issue. Could be a connection issue but if not then it may be a much more serious issue.
What year is your car?
I can get you some info on how to test for that later when I get home. Some people clean the internal contacts or just replace it if that is the issue. I have that info too.
With regard to that code it is called the EBCM "code of death". I think it is separate from your specific voltage issue. Could be a connection issue but if not then it may be a much more serious issue.
What year is your car?
I followed bill's ign switch repair, (my contacts all tested fine before, and maybe slightly improved after the clean). I've got 2-3 fuses showing a lower voltage than the rest, but I don't have the interior fuse cover to tell me what they are
08-21-2014, 03:43 PM
#6
Tech Contributor
Member Since: Dec 1999
Location: Anthony TX
Posts: 32,736
Received 2,180 Likes
on
1,583 Posts
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The DIC Analog and Digital voltage reading is read or comes from a contact from the IGNITION SWITCH.
When the contacts get dirty, the switch supplies less and less output until one day, you see low voltage DTCs when you read codes
The LDCM and RDCM are the most sensitive.
Replace or service the Ignition Switch, clear your DTCs and see what you get.
Bill
08-21-2014, 04:10 PM
#7
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
100% Correct
The DIC Analog and Digital voltage reading is read or comes from a contact from the IGNITION SWITCH.
When the contacts get dirty, the switch supplies less and less output until one day, you see low voltage DTCs when you read codes
The LDCM and RDCM are the most sensitive.
Replace or service the Ignition Switch, clear your DTCs and see what you get.
Bill
The DIC Analog and Digital voltage reading is read or comes from a contact from the IGNITION SWITCH.
When the contacts get dirty, the switch supplies less and less output until one day, you see low voltage DTCs when you read codes
The LDCM and RDCM are the most sensitive.
Replace or service the Ignition Switch, clear your DTCs and see what you get.
Bill
08-21-2014, 04:12 PM
#8
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
100% Correct
The DIC Analog and Digital voltage reading is read or comes from a contact from the IGNITION SWITCH.
When the contacts get dirty, the switch supplies less and less output until one day, you see low voltage DTCs when you read codes
The LDCM and RDCM are the most sensitive.
Replace or service the Ignition Switch, clear your DTCs and see what you get.
Bill
The DIC Analog and Digital voltage reading is read or comes from a contact from the IGNITION SWITCH.
When the contacts get dirty, the switch supplies less and less output until one day, you see low voltage DTCs when you read codes
The LDCM and RDCM are the most sensitive.
Replace or service the Ignition Switch, clear your DTCs and see what you get.
Bill
I'll open it back up and get some pics with my meter too
08-21-2014, 06:23 PM
#9
Tech Contributor
Member Since: Dec 1999
Location: Anthony TX
Posts: 32,736
Received 2,180 Likes
on
1,583 Posts
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Thanks for replying! I've read tons of your posts. I'm baffled on the key switch tho because it ohms out correctly (when I checked it before dis-assembly it was still "in spec" if that's what ya wanna call it. There was no pitting, just mild carbon. 80% basically wiped off with a rag. 1000grit took care of the rest
I'll open it back up and get some pics with my meter too
I'll open it back up and get some pics with my meter too
The two large pins in the black connector are dirty and spread apart"
Bill
08-22-2014, 06:18 AM
#10
Le Mans Master
Look on your owners manual for fuse locations.
08-25-2014, 08:00 PM
#11
7th Gear
Thread Starter
Member Since: Aug 2014
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
ok, so looking at my connectors, one or two appear to be kinda smushed.. how do i remove them and re-spread them..