Ignition Harness

Tiny
ANITAPITTS
  • MEMBER
  • 2001 VOLVO V40
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 218,000 MILES
Last month my ASB light came on, I took my car to get checked and was told that the spark plugs needed to be replaced and new ignition coil packs. I had just replaced the plugs two months earlier, but agreed. The day I drove my car off the lot, the check engine light came on after driving for 30 minutes. I took my car back and was told that something was loose. The check engine light came on again. I took it back and now am being told that it needs a new ignition harness. Do 2001 Volvo V40's have this and could it cause my check engine and AGAIN, the ASB light to come back on?
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Tuesday, November 30th, 2010 AT 4:26 PM

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Tiny
CARADIODOC
  • EXPERT
The ABS system has nothing to do with the spark plugs and wires unless, in very unusual situations they are radiating signals that are picked up by the wires going to an ABS wheel speed sensor. Ford trucks are the only ones that have a little trouble with that. When the ABS warning light turns on, there will be a diagnostic fault code stored in the computer's memory that will lead to the circuit or system with the problem, not necessarily the defective part. Those codes are the starting point in the diagnosis of the ABS light.

It is very rare to need an entire wiring harness for any circuit in the car unless they are sure it is the cause of an intermittent and hard-to-diagnose problem. That is something mechanics fall back on when they don't know how to diagnose a problem. Multiple melted wires, such as after an engine fire, would be the exception. If they found bare wires or wires touching each other, they found the problem and things like that can be fixed without replacing the entire harness.

As for the Check Engine light, the same goes for stored diagnostic codes in the Engine Computer. Since it came on right after ignition system parts were installed, the logical place to start looking is with those parts. There are a lot of aftermarket parts that work just fine in most applications but have some little quirk that makes them not work right in a few applications. Volvos use a lot of weird parts and it may be necessary to use original ones. In most states, shops are required to give you your old parts that were replaced. If you have them, you might ask the shop to put them back in since they weren't very old and didn't solve a problem.

Caradiodoc
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Tuesday, November 30th, 2010 AT 5:01 PM
Tiny
JIS001
  • EXPERT
It is rare that the ignition harness failes but it does from time to time. The harness is not very expensive since you are not actually replacing the whole engine harness. Just the harness for the coils and cvvt solenoid reset valve. What usually failes is the capacitor inside the harness. What you would experiance with that failing is a random misfiring, shaking under load, and the check engine light flashing. Now as for the ABS light coming on, did they actually scan and diagnose any fault codes related to the ABS? If they did can you post the codes that were scanned?
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Wednesday, December 1st, 2010 AT 3:50 AM

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