No spark.

Tiny
VENGEANCE69
  • MEMBER
  • 1994 ISUZU RODEO
I have replaced the ignition coil, distributor cap, rotor, plugs and wires. I cannot find the ignition control module for this vehicle. Where is it located. Does it even have one? I found a blue wire loose under the hood and determined that this was the ground wire to the coil. I gronded it and checked for 12V at the coil connector with the key on and I have 12 volts.I have read it could be the ignition module but I don't see one on my truck.
Saturday, August 24th, 2013 AT 7:17 PM

9 Replies

Tiny
TY ANDERSON
  • MECHANIC
  • 719 POSTS
With the key on engine off you should be getting battery voltage on the Yellow/blue wire to the ignition coil. This vehicle has the 2.6l engine and does not come with a control module for the ignition. It does however, have what is called a power switch (located on the underside of vehicle, driver side of engine) it has two wires running to it a green and blue. The blue wire your seeing may just be a test connector for diagnositics and is not used. From what I've found there is a blue wire splice into the blue wire running to the coil.
The power switch is used to fire the coil so you need to make sure you getting a signal from it. Hope this helps
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Sunday, August 25th, 2013 AT 8:35 AM
Tiny
VENGEANCE69
  • MEMBER
  • 5 POSTS
Thanks Ty. Do you happen to have access to a reference diagram to show the actual power switch?
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Sunday, August 25th, 2013 AT 9:09 AM
Tiny
TY ANDERSON
  • MECHANIC
  • 719 POSTS
All I've found is a wiring diagram for the ignition system. I'm working on getting just an image of that but have been unsuccessful. I've sent an email to get some support for this. The wiring diagram references this "power switch" location as: "underside of vehicle, right side of engine". As soon as I can get more information I will send it your way. I've got your question saved so I can get back to you.
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Monday, August 26th, 2013 AT 1:14 PM
Tiny
VENGEANCE69
  • MEMBER
  • 5 POSTS
Thanks so much. I don't see anything on the engine on the drivers side. I have a Haynes manual for this truck and it says nothing about this (power switch) The small schematic I have shows the circiut consisting of the relay, ignition module( I don't see that either so it must be in the distributor like an HEI chevy), the distributor and the ECM. I ordered a new ECM for it yesterday. I have 12Volts at the coil on the yellow wire to ground. When I probe the blue and yellow together I have nothing. The blue wire I think is the secondary that the ECM provides.
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Monday, August 26th, 2013 AT 6:06 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 719 POSTS
Here is a wiring diagram for both engine the distributor, coil and power switch. But I would say you need a crankshaft angle senor which is not in the distributor it down on the engine block.
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Wednesday, August 28th, 2013 AT 9:07 PM
Tiny
VENGEANCE69
  • MEMBER
  • 5 POSTS
Hi ty, I replaced the Distributor. That did not solve the problem. I can't find the power switch on this truck. Do you have any pictures of what it looks like?
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Friday, September 6th, 2013 AT 4:49 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 719 POSTS
The power switch has one green wire and one blue wire. Note that the green wire at the switch also turn yellow wire then blue wire so keep this in mind when searching.
Before you go looking for the power switch make sure all the engine-to-body grounds are adequate. Because the power switch is grounded to the engine it is critical that grounds connections are in good condition. So, if they're covered (tape, conduit) uncover and make sure they're good first.

Here are some location diagrams I found
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Monday, September 9th, 2013 AT 7:34 PM
Tiny
VENGEANCE69
  • MEMBER
  • 5 POSTS
Hey Ty, I FOUND IT! Put this in your note files if anyone else needs this. It is called the ignition control module not power switch here in the states. It is located right above the starter on the engine block. It has 2 10mm screws holding it on. Tou can't see it if you are directly under the starter. Thanks for all your help. It has a molex connector on it and has the blue and green wire you told me about! Thanks, Rick
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Tuesday, September 10th, 2013 AT 4:03 AM
Tiny
TY ANDERSON
  • MECHANIC
  • 719 POSTS
Good to hear! Check those grounds I mentioned and signal to the module. Let me know how it goes, Ty
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Tuesday, September 10th, 2013 AT 5:39 PM

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