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Old 06-29-2022, 09:19 AM   #1
Timmermans
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Default Error code 144 Load signal, keeps coming back

I keep getting a 144 code on my ignition: Load signal missing. Car runs pretty good. only a slight hesitation when accelerating. Idles good and never stalls.

Specs:
1992 volvo 240
B230FK
Wasted spark with Miata power stage and Bosch 2x2 coil

Can this have something to do with the wasted spark?

From what I read the load signal is produced by the ECU. It's output is port 25
it comes in on the EZK on port 8. How does the ECU produce this signal? what sensors does the ECU use to produce this signal. Maybe then I can trace back the issue.
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Old 06-30-2022, 06:56 PM   #2
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The Load or Tq signal is a short pulse generated twice per rev by the ECU. The width of the pulse is roughly proportional to the MAF air flow or to the injector on-time -- the higher the airflow, the longer the injector on-time, and the wider the Load pulse. The EZK box uses the Load signal to select the row in the ignition advance table - higher load gives less advance. There's more detail here:
http://forums.turbobricks.com/showthread.php?t=337984

The only way the wasted spark would interfere with the Load signal is if there's a loose wire or shorted out pins. I think one of the more common causes of the 1-4-4 code is poor power/ground connections and/or corroded fuses. Try inspecting the main engine compartment blade fuse.
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Old 06-30-2022, 07:14 PM   #3
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I've seen this caused mostly by bad harnesses (nightmare) or bad fuel pump relays (easy)
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Old 07-02-2022, 07:34 AM   #4
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All my wires are good, measured them. Fuel relay including the plug is also good. I have a brand new blade fuse terminal, so no problems there. I Will try running the car without the wire from pin 25 to 8, to see if it makes any difference in drivability. Maybe the ECU is just bad. Is it possible to measure this signal with a standard multimeter? Because it pulses?
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Old 07-02-2022, 11:01 AM   #5
ZVOLV
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Mine was a failing inline fuse holder near the battery.
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Old 07-02-2022, 02:21 PM   #6
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Quote:
Originally Posted by Timmermans View Post
Is it possible to measure this signal with a standard multimeter? Because it pulses?
No, it's a really skinny little pulse (~0.0001 seconds long), so the multimeter will just read 0volts. If you have access to a labscope, it would be interesting to see if it's a) dead, or b) noisy, or c) mostly working but occasionally dropping a pulse.
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Old 07-03-2022, 03:42 PM   #7
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I just tried to measure it. No problem. Multimeter on mV. Readed around 380 mV on idle and 410mV with the ac on. So the signal from the ECU is probably good. Traced the signal wire to the EZK, also good. Measured inside the EZK, no voltage... Turned out to be a little bit bent open pin in the EZK connector.

I will just drive on and see if the code comes back, can still be a bad ECU.
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Old 07-04-2022, 04:34 PM   #8
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Now I get a 142 code, EZK internal faillure....
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