1992 N14 1500 max

Discussion in 'International Forum' started by BoxCarKidd, Jun 28, 2018.

  1. Jun 28, 2018 #1
    BoxCarKidd

    BoxCarKidd Road Train Member

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    This is a 92 IHC with an N14. The only diagnostic connection I can find is on the left kick panel. It is small, the size of my thumb. I have nothing to connect to it.
    The speedometer sensor is a single with four wires. The speedometer works and swapping the connectors made no difference.
    Holding the DIAG toggle ( KOEO ) Will flash 21, 22, and 23 at times. Possibly I miscount at times but I find no information on these numbers.
    After researching I will replace the fuel filter. It is skipping ( Miss firing ) on number 4. Looks like wiring harness can cause this also?
    Any experience on this appreciated.
     
    BoxCarKidd, Jun 28, 2018
    BoxCarKidd, Jun 28, 2018
    #1
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  3. Jun 29, 2018 #2
    Bean Jr.

    Bean Jr. Road Train Member

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    Is it a mechanical N14? Some of the early ones were. I drove a 93 that was.

    Read it a third time, and saw you have a diagnostic switch, so ignore my question.
     
    Bean Jr., Jun 29, 2018
    Bean Jr., Jun 29, 2018
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    BoxCarKidd Thanks this.
  4. Jun 29, 2018 #3
    Heavyd

    Heavyd Road Train Member

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    Yes, congratulations, you have a very first generation electronic N14 with that goofy diagnostic connector that pre-dates ATA 6 pin. All Cummins codes are three digit. 241, and 242 are vehicle speed sensor codes. Basically any circuit fault of the VSS will limit engine RPM to what ever the value is programmed for, usually 1500. VSS inputs on the ECM are pins 3 and 7 of the OEM connector, or the top outer one. I don't have a wire diagram for that year, you might have to make up an overlay if you can't find a broken wire somewhere.
     
    Heavyd, Jun 29, 2018
    Heavyd, Jun 29, 2018
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