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Hiya Mr. Bert Nabisco,
Please forgive me. Some plain-label bite-sized shredded wheat today.
LH-Jet 3.1 OBD Socket 2 Code 1-2-3 ECT Sensor wiring or function fault.
A fault exists in the wire harness between the ECT LH-Jetronic portion of the ECT sensor (ECT is 2 sensors in 1! One for LH-Jet, the other for EZK, with separate wire harness conductors from each ECT connector pin to a pin on the EZK and the LH-Jet wire harness connector. Resistance is measured by the control units at the unique thermistor for each to the ground the ECT encounters through its threaded connection at the cylinder head. There is (may be?) a crimped connector in the ECT wiring under the engine control harness sheathing between the #2 and #3 runner that can corrode . Dunno right now if a unique crimp for each wire between the ECT and each control unit under the sheathing or if just one. I believe just one for the LH-Jet ECU wiring, though forget right now.
As you are in salty and humid Brooklyn near Swedish Baklava. If you engine bay is rife with surface corrosion of the aluminum and rust of the steel metal bits, please consider wire harness corrosion a factory.
Yep, and check grounds. Loosen tighten the bolts to secure the fuel rail to the air intake port. You see ring terms that secure under the flange bolt with maybe a washer. Twist loose and tight while holding the term so it does not twist. A Volvo TSB indicates flowing solder or cutting and crimping and soldering new ring terms may over come corrosion in the crimp of the ring term barrel.
EZK 116 OBD Socket 6 Code 1-4-4 Load signal missing from LH-Jet ECU.
One of several wire harness connections between the LH-Jet 3.1 ECU and the EZK 116 ECU. It may mean you have corrosion at the wire harness connector at one or both of the ECU connector pins.
EZK ECU pin #8 to LH-Jetronic ECU pin #25. Yellow / Brown stripe wire. This is the load signal wire connection.
With battery disconnected, you can merely disconnect and reconnect the ECU connectors. You can inspect the ECU pins. If you see a white substance on the pins, it is corrosion. Dress, sparingly, some DeoxIT dielectric low voltage grease applied to the connector spades.
See Here for LH-Jet ECU & EZK ECU Pinout and interconnect.
See:
http://ipdown.net/jetronic.info/tiki-index.php
http://ipdown.net/jetronic.info/tiki-index.php?page=LH2.4+Pinouts+and+Diagrams
Welp, we can look at the wiring diagrams on the Volvo Wiring Diagram site.
http://www.volvowiringdiagrams.com/?dir=volvo/240%20Wiring%20Diagrams
For 1991 240 PDF. See PDF page 21 of 22.
If I recall, there is no intermediate connector for engine control wire harness conductors that interconnect the two ECUs. I may be wrong. One would need to pull the passenger side exterior (covers the LH-Jet ECU) kick panel and the fuzzy-fluffy under the dash cover the passenger side floor vent pokes through to get at the EZK ECU. I'm current unsure if the ECUs ground through their steel enclosures where they secure to their frames. They do ground through engine control wire harness on the center console frame and one the mounting frame. Though see the wire harness insulation color description.
Or there may be fault inside one of the ECUs to transmit (LH-Jet this) info to the receiving (EZK) ECU.
Does that help you?
I'm certain someone else can cough up the simple solution to check and help you trouble shoot the faults through to resolution.
Hope that helps.
Happy Christmas!!!!
Porkchop Boyeeeee.
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