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240 No Start Again Jumped Fuses Starts 200

posted by  cgilmore on  Sat May 29 12:42 CST 2010
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last visit: Fri Apr 4 16:22 CST 2014
[RELATED]

Back again with my 89 240 intermittent no start still unresolved.
So , the no start happened again yesterday.
Did some basic checks, fuse 4, 25 A main fuse, a NOID light on injector, replaced fuel relay.
Everything OK, still no start.
Jumped fuse 4 to 6 on the right side in the fuse panel , cars starts and runs fine.
Remove jumper from fuse 4 to fuse 6 - car dies.
Looks like the FI computer may not be energizing that side of the fuel system relay ?
What am I missing?








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    cAOWrTlgsTyxtZgAu 200 1993

    posted by  someone claiming to be tqlpsaij on  Wed Jun 30 00:48 CST 2010 [RELATED]

    LdeL7A wltgbhwdfmlb , [url=http://bjxmzpnvlixd.com/]bjxmzpnvlixd[/url], [link=http://snirkhyshoxt.com/]snirkhyshoxt[/link], http://zylpceojwunn.com/









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    240 No Start Again Jumped Fuses Starts 200

    posted by  Farm Boy on  Mon May 31 18:13 CST 2010
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    last visit: Mon Oct 28 07:35 CST 2013
    [RELATED]

    Sounds like ECU. If supplying a ground to the relay on the ECU wire allows the car to start, it is the ECU.

    Don't be tempted to just leave the jury-rigged ground in place, that is a safety mechanism that turns off the fuel pump in the event of an accident.

    I bought a refurbished ECU for my '90. It is still working fine 6 years later.








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      240 No Start Again Jumped Fuses Starts 200

      posted by  cgilmore on  Wed Jun 2 12:48 CST 2010
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      last visit: Fri Apr 4 16:22 CST 2014
      [RELATED]

      Hi:
      Thanks for the input. My brother-in-law just bought a good used ignition
      computer on fleebay and has good luck. I Have thought about this.

      My understanding though is that the '89 240 has a mechanical rollover valve/cutoff.
      In the event of non-rollover accident where the engine continues to run there is
      nothing to stop fuel flow.
      In the event of non-rollover accident where the engine dies, the impulse detector
      indicates no crank pulses then injectors and fuel pumps stop with a normally functioning fuel injection computer.
      The fuel pump relay should then open and stop supply voltage to the injectors.
      If the fuel pump relay supply voltage to the injectors is used as source for an alternate fuel pump relay coil supply voltage, then all of the safety features should be functional.Please let me know if I am wrong...
      Thanks.







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        561 ECU - Fuel relay problem work around 200 1989

        uid 18083's pic
        posted by  lucid on  Thu Jun 3 03:13 CST 2010
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        last visit: Fri Oct 24 12:31 CST 2014
        [RELATED]

        Here's what you need to safely work around the known ECU problem:

        • K-Jet Fuel relay (PN 3523639, old #1348600). This will work as an ignition-controlled ground path for the LH 2.4 Fuel relay.

        • A 6-pin relay harness plug from the JY, cut loose with at least 4" or 5" of wiring.

        (1) The LH Fuel relay's coil ground wire (blue-green) is cut and extended by a spliced-in wire to the harness plug wire matching K-Jet relay terminal 30 (switched INPUT).

        (2) The K-Jet relay's switched OUTPUT is attached to any good ground by splicing a wire from the harness plug wire for K-Jet relay terminal 87.

        The LH Fuel relay coil ground path will now be complete as long as the K-Jet relay is energized. This requires:

        (a) A wire "tapped" (Scotch Locked, NOT cut) from LH relay 87-1 wire (Orange) and spliced to the harness plug wire for K-Jet relay terminal 15. This wire supplies the K-Jet relay coil with +12V when the Key in position II or III.

        (b) The Red-White wire at the tach (or hanging disconnected if no tach installed) has the ignition pulses needed to energize the K-Jet relay. Add a wire carrying these Ignition pulses and splice it to the harness plug wire for K-Jet relay terminal 31b.

        (c) Lastly, the K-Jet relay coil ground side (harness plug wire for terminal 31) must be connected to ground. This can be an improvised connection to relay terminal 87 (previously grounded, see 2 above).

        The LH Fuel relay control will now be functionally and safely equal to that of a good 561ECU.

        --
        Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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        240 No Start Again Jumped Fuses Starts EDIT 200 1989

        uid 18083's pic
        posted by  lucid on  Wed Jun 2 13:21 CST 2010
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        last visit: Fri Oct 24 12:31 CST 2014
        [RELATED]

        "If the fuel pump relay supply voltage to the injectors is used as source for an alternate fuel pump relay coil supply voltage, then all of the safety features should be functional.Please let me know if I am wrong..."

        The Fuel "pump" relay does not supply the LH 2.4 injector voltage.

        That voltage is supplied by the "Main" or system relay, which also lives in the white case with the Fuel relay (and would still be active with no ignition).

        The System relay also supplies the "fuel pump relay coil supply voltage", which will also still be active. It's the ground side of the Fuel relay coil that's controlled for safety (via the ECU) when there is a loss of ignition.

        EDIT: It is possible to use a K-Jet Fuel relay (activated by ignition coil pulses) to control the LH2.4 Fuel relay ground side like the ECU normally does.
        The wiring is not all that complex.

        --
        Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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    240 No Start Again Jumped Fuses Starts 200

    posted by  rstarkie on  Sat May 29 13:42 CST 2010
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    last visit: Fri Oct 24 10:14 CST 2014
    [RELATED]

    Do you know what ECU is in the car? The pink label 561 is a known loser. If it happens to be one of those the white label 951 is the preferred replacement.

    Randy








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      240 No Start Again Jumped Fuses Starts 200

      posted by  cgilmore on  Sat May 29 15:11 CST 2010
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      last visit: Fri Apr 4 16:22 CST 2014
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      Haven't checked yet, but I will and try to find one at the local U-Pull_It.
      Good info about the computers - they are interchangeable I guess from your post...
      In the mean time I am rigging up a relay to power the ground side of the portion of the fuel system relay that is not getting ground from the FI computer - I Think.








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      240 No Start Again Jumped Fuses Starts 200

      posted by  cgilmore on  Sat May 29 14:09 CST 2010
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Apr 4 16:22 CST 2014
      [RELATED]

      Haven't checked yet, but I will and try to find one at the local U-Pull_It.
      Good info about the computers - they are interchangeable I guess from your post...
      In the mean time I am rigging up a relay to power the ground side of the portion of the fuel system relay that is not getting ground from the FI computer - I Think.








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      240 No Start Again Jumped Fuses Starts 200

      posted by  cgilmore on  Sat May 29 13:59 CST 2010
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Apr 4 16:22 CST 2014
      [RELATED]

      Haven't checked yet, but I will and try to find one at the local U-Pull_It.
      In the mean time I am rigging up a relay to power the ground side of the portion of the fuel system relay that is not getting ground from the FI computer - I Think.







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