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Old 07-12-2018, 07:32 PM   #1
ZVOLV
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Default 1991 740. CODE 4-1-3. Looking for greenbook info/help

I just bought a 1991 740. I noticed, after the purchase, that the check engine light bulb has been removed. No wonder he balked when I was asking if it had passed smog. So I swapped bulbs, and guess what, check engine light was on and came back first start of the engine after clearing it.

It has a code 4-1-3 stored for EGR temp sensor absent of faulty.

I have looked at the Volvo wiring diagrams.com website and I'm not finding the specs for the sensor. I'm going to do basic diag, but looking for help finding the specs for the sensor. I plan to activate the EGR valve manually and seeing what the readings on the sensor are during flow.

I wouldn't be surprised if this car has the wrong computer in it.
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Old 07-12-2018, 07:54 PM   #2
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I'm not sure if it's the same, but Bentley has the specs for the 240 EGR w/ EZK116

pg 253-6 EGR vacuum booster 85 +/-10 ohms
Temp sensor at ambient 500-1000 ohms

[And I think the EZK code is 4-3-1]
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Old 07-12-2018, 08:09 PM   #3
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If ECU catches it immediately after start it's probably because of the connection failure, broken wire, etc.
If you get any kind of Ohm readings and apply vacuum on the running motor the resistance will drop very fast as long as there is EGR flow.
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Old 07-12-2018, 09:19 PM   #4
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Quote:
Originally Posted by PCH View Post
If ECU catches it immediately after start it's probably because of the connection failure, broken wire, etc.
If you get any kind of Ohm readings and apply vacuum on the running motor the resistance will drop very fast as long as there is EGR flow.
Yep. I'm over thinking it. It triggered so fast it's gotta be the wrong EZK unit or a complete open.
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Old 07-13-2018, 01:17 AM   #5
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What is your EZK number? Easy to just swap out with non egr EZK then no more light. 148 EZK for turbo is non egr. EZK ignition box does the EGR.
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Old 07-13-2018, 05:32 PM   #6
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I will look at the EZK. I want EGR to stay functioning. The car needs to pass smog tests. I just passed the sniffer. I can neither confirm or deny if a third of a tank of E85 was used. Emissions numbers were low!

I can check, but is it disabled if there's the CEL?

Thinking about it, the wrong EZK box (a non EGR one) wouldn't throw a EGR code. The code was only on the EZK pin 6 socket. To that means I need to shake down the problem.

I need a wiring diagram...
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