2003 Golf 1.8 Ignition Coil Wiring Diagram

July 22, 2010 Updated: January 31, 2020 By: Abraham Torres-Arredondo Article ID: 434

This tutorial will help you to diagnose a bad ignition control module (ICM) causing a misfire condition on your VW 1.8L Passat (New Beetle, Jetta, Golf) . It will also help you to troubleshoot a bad Coil-On-Plug (COP) ignition coil.

One of the most common failures with this type of ignition control module (ICM) is a misfire condition in which the ignition module doesn't activate one of the Coil-On-Plug (COP) ignition coils.

This condition is usually misdiagnosed as a bad ignition coil and the end result is money spent on parts that don't solve the misfire issue.

In this article, I'll show you my way of testing the ignition control module. It's a very easy test, that doesn't involve using any expensive diagnostic equipment (not even a scan tool!) and that I've used time and time again, over the years, with very accurate results.

For your cross reference information, the ignition control module that this article covers are:

1. AutoZone part #:
   1. Duralast RB155
2. O'Reilly part #:
   1. MasterPro 2-7122
   2. Import Direct 14-0284
   3. Import Direct 14-0279
   4. AC Delco F1909A
3. Others:
   1. STANDARD MOTOR PRODUCTS Part # LX920
   2. Airtex Part # 6H1022
   3. WELLS Part # RB155

What Tools Do I Need To Test The Ignition Control Module And The COP Coils

As I mentioned at the beginning of this tutorial, you don't need a scan tool. Here are the tools you'll need:

1. Multimeter
   1. A digital or analog multimeter will work.
   2. If you need to buy one or are looking to upgrade, check out my recommendations here: Buying A Digital Multimeter for Automotive Diagnostic Testing.
2. A spark tester
   1. A dedicated spark tester is a must-have tool to correctly diagnose an ignition system misfire or no-spark condition. I'm gonna' recommend to you the HEI spark tester because of its accuracy and ease of use. To find out more about this spark tester, you can read more here: HEI Spark Tester.
3. Wire Piercing Probe
   1. Although not an absolute must, this tool is a time saver of the first order. To see what this tool looks like, go here: Wire Piercing Probe.

You'll also need basic hand tools to remove the ignition module (if it tests bad that is), like a ratchet wrench, sockets, etc.

Ignition Module Circuit Descriptions

The ignition control module has two connectors. Looking down at the ignition module (with the ignition module still bolted in place), you'll notice that the ignition control module has a left connector and a right connector.

In the pin out charts below is a brief job description of what each wire does.

NOTE: Although I've included the color of the wires, in the charts below, I can tell you that they are not gonna' match the colors that are on your vehicle (it's been my experience that the colors described on the wiring diagrams usually never matches what's on the VW).

So then, how can you locate the wire you'll need to test? Very easily, because the connector labeled as the 'Left Connector' (in the photo above) has only 4 wires connected to it and the connector labeled as the 'Right Connector' has 5 wires connecting to it.

Also, you'll find the number of the wire embossed on the ignition control module (Igniter) and this will also help you further identify the wire to be tested.

Right ICM Connector Pin outs
Pin	Wire Color	Description
1	Gray *	Cyl. #1 Ignition Coil Signal
2	Gray w/ Brown stripe *	Cyl. #2 Ignition Coil Signal
3	Gray w/ Black stripe *	Cyl. #3 Ignition Coil Signal
4	Brown w/ Black stripe *	Cyl. #14 Ignition Coil Signal

* Your specific VW vehicle may have different colors.

Left ICM Connector Pin out
Pin	Wire Color	Description
1	Grey w/ Yellow stripe *	To Fuel Injection Computer
2	Yellow w/ Grey stripe *	To Fuel Injection Computer
3	Brown *	Chassis Ground
4	Red w/ Gray stripe *	To Fuel Injection Computer
5	Green w/ White stripe *	To Fuel Injection Computer

* Your specific VW vehicle may have different colors.

COP Ignition Coil Circuit Descriptions

OK, before we jump into the testing part (in the next page), you need to know a few more things and this is what each of the three wires that connect to the ignition coil connector do.

This is important because in the tests (in this tutorial), I'm gonna' ask you to verify Power (12 Volts), Ground and continuity between the ICM and coil at the ignition coil's 3-wire electrical connector.

OK, these are the circuits (wires):

COP Ignition Coil Connector Pin outs
Pin	Wire Color	Description
1	Color will vary with coil *	ICM Switching Signal
2	Brown w/ Yellow stripe *	Chassis Ground
3	Black w/ Blue stripe *	Power -12 Volts

* Your specific VW vehicle may have different colors.

Once again, I want to tell you that you don't have to worry about the specific colors of the wires on your vehicle since you'll be able to locate the correct wire to test with the photo I'm providing.

OK, let's turn the page and get testing!

Source: https://easyautodiagnostics.com/vw/1.8L/icm-and-ignition-coil-tests-1

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