Matt Allen Posted May 3, 2012 Share Posted May 3, 2012 working on a 2001 Mack Pumper, have an Active code 128 4 4; can you supply troubleshooting? Quote Link to comment https://www.bigmacktrucks.com/topic/24922-active-code-128-4-4/ Share on other sites More sharing options...
Mackpro Posted May 4, 2012 Share Posted May 4, 2012 I think you have a MID-128 SID-4 FMI-4 code which is the #4 EUP injector pump. But not 100% sure if this is the code you are reading. How are you reading this code? Quote Link to comment https://www.bigmacktrucks.com/topic/24922-active-code-128-4-4/#findComment-117603 Share on other sites More sharing options...
Matt Allen Posted May 7, 2012 Author Share Posted May 7, 2012 using PTT software, there is no guided diagnostics, we swapped pump four with pump 5 and it did not follow. this is definetely an electrical problem. Quote Link to comment https://www.bigmacktrucks.com/topic/24922-active-code-128-4-4/#findComment-118177 Share on other sites More sharing options...
Mackpro Posted May 7, 2012 Share Posted May 7, 2012 using PTT software, there is no guided diagnostics, we swapped pump four with pump 5 and it did not follow. this is definetely an electrical problem.If the FMI is 4 that means voltage low or open circuit. If your engine ECM is mounted up on its edge on the driver side of the engine, pull the top/J1 connector loose and check for antifreeze or oil in the connection. Wire number for the # 4 eup are EJ1-24-2.0 and EJ1-41A-2.0 . Which would be pins 24 and 41 in the engine top/J1 connector. Quote Link to comment https://www.bigmacktrucks.com/topic/24922-active-code-128-4-4/#findComment-118185 Share on other sites More sharing options...
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