Freightliner Century 1999 I can't idle up......

Discussion in 'Freightliner Forum' started by PupaINC, Jul 3, 2020.

  1. PupaINC

    PupaINC Bobtail Member

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    Aug 23, 2013
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    When running cruise control works fine. But I can't idle up. This is happening after super 10 speed transmission swapped to 13 speed. No codes. Nothing.
    Any idea? Thanks!
    Roman
     
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  3. Hulld

    Hulld Road Train Member

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    If there is an issue with your parking brake switch it will not idle up.
    Or if you forget to apply the parking brake it won’t idle up
     
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  4. jamespmack

    jamespmack Road Train Member

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    ^^^^ he is more than likely correct.

    Just gonna add, if it has optimized idle option from factory. It has a mercury switch on the hood. It tells ecm that hood is closed for automatic start. Its 2 wire and you can jump it with a paperclip.

    I just can imagine a 1999 with opt idle parts still on the truck. But it's possible.
     
  5. PupaINC

    PupaINC Bobtail Member

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    I know it’s unbelievable but. Yes, there’s opt idle on the truck. and it was working until trans swap. I did apply my parking brake. Maybe there’s issue with transmission harness? But speed sensor is working fine. I already tried to jump brake switch. Nothing. It’s weird, coz everything’s working fine when I’m driving.
     
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  6. jamespmack

    jamespmack Road Train Member

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    You need to get a prolink and plug in and see what sensor isn't communicating. There are like 6 sensor idk. Last time I really work on opt idle was 2005. Trying to recall everything.
     
  7. jamespmack

    jamespmack Road Train Member

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    Does it have 1 speed sensor but two plug and 4 wires in sensor?

    Try switching plugs. Seem to recall this happening after someone would do a clutch job and mix up plugs.
     
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  8. blairandgretchen

    blairandgretchen Road Train Member

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    Did the opti idle have a neutral safety switch on the old transmission - ?
     
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  9. jamespmack

    jamespmack Road Train Member

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    I forgot about that one. Not at home. I cant pull out my dusty detroit bibles.

    How you been Sir? Hope all is well.
     
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  10. PupaINC

    PupaINC Bobtail Member

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    I don’t know about safety switch. But harness to the old transmission had 4 connections and this one rtlo18913a only 2. So we didn’t connect solenoid harness (3 wires) and some 2 wires connector.
    Old transmission was
    FRO16210C
    We did try to switch connectors. Thank You for helping!
     
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  11. blairandgretchen

    blairandgretchen Road Train Member

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    Good, thank you! A little quiet lately and back on general freight to keep me busy.
     
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