SP,
try changing that shift-up bulb with a good known one. Ok-ok, that's probably a tad over the cross, sorry.

If you were an ECU - LH Jetronic 2.4 ECU in this case - then at what conditions would you toggle that indicator on? Huh? Yeah, right:
- if you're above some RPM threshold vs road speed (you may also want taking into account engine load and/or throttle position, i.e. whether it's WOT ot not)
- if you're insane when you do whatever you want to do, not what you're taught to do

The same is true for those solid-state brains.

Zig

P.S.
As you may have learnt, I'm not the fan of 'jack the rad cap' troubleshooting (thanks, Chris!). So if you can not really see or hear what those brains are thinking about (btw, there was a nice ad there re 'thinking about', see the link below) since you do not have JTAG debugger nor even ISAT/Tech2 diagnostic tools, then you should analyze the live inputs and outputs and start your troubleshooting from there.
In other words: consider your LH ECU to be poorly grounded which drives it into some special unstable and undocumented state when his functionality is completely unpredictable (this is just a case study, may not be your case). You throw in another ECU and it kinda runs good - but only because there were additional 1.5 grams of solder used on the signal ground PCB traces which helps maintain reasonable power ground. Does it mean the first ECU is bad? No. It means you should fix the poor ground connection - or you may ruin your second ECU.

posted by 188.134.4...

sienkin ebaut

• Return Hose On Fuel Pressure Regulator, Sunset Park, Mon, 22 Jul 2013 23:05:54
  • Re: Return Hose On Fuel Pressure Regulator, Bill S , Tue, 23 Jul 2013 09:09:01
  • Re: Return Hose On Fuel Pressure Regulator, Cmyles , Tue, 23 Jul 2013 08:34:02
    • Thanks!, Sunset Park, Tue, 23 Jul 2013 10:14:12
      • Re: Thanks!, Cmyles , Tue, 23 Jul 2013 11:14:54
        • ECU/EZK Pinout Question, Sunset Park, Wed, 24 Jul 2013 00:16:14
          • ECU = Electronic Control Unit, Siegfried, Wed, 24 Jul 2013 05:23:39
            • Re: ECU = Electronic Control Unit, Sunset Park, Wed, 24 Jul 2013 09:20:03
              • try swapping the car with a good known one, Siegfried, Wed, 24 Jul 2013 10:54:42
                • USB Oscilloscope, RS , Wed, 24 Jul 2013 12:52:13
                  • Everything is better with bluetooth, Siegfried, Wed, 24 Jul 2013 12:59:24
                    • Fascinating n/m, RS , Wed, 24 Jul 2013 13:04:29
                • Re: try swapping the car with a good known one, Sunset Park, Wed, 24 Jul 2013 12:15:46
                  • Shift-up light: that's something!, Siegfried, Wed, 24 Jul 2013 12:46:20 <-- Viewing This Message
                    • Dash Tach vs. Tach Signal to ECU, Sunset Park, Wed, 24 Jul 2013 12:55:05
                      • I didn't mean that at all, Siegfried, Wed, 24 Jul 2013 13:20:45
                      • Re: Dash Tach vs. Tach Signal to ECU, Cmyles , Wed, 24 Jul 2013 13:19:19
                  • Re: try swapping the car with a good known one, Cmyles , Wed, 24 Jul 2013 12:44:46
                • Excellent Zig!, Cmyles , Wed, 24 Jul 2013 12:12:48
              • Re: ECU = Electronic Control Unit, Justin VanAbrahams , Wed, 24 Jul 2013 10:21:35
                • Justin, Nu-uh maaaan!, Cmyles , Wed, 24 Jul 2013 12:08:52
                  • Re: Justin, Nu-uh maaaan!, Sunset Park, Wed, 24 Jul 2013 12:46:10
                    • Just for the heck of it ..., RS , Wed, 24 Jul 2013 12:55:22
                      • Re: Just for the heck of it ..., Sunset Park, Wed, 24 Jul 2013 13:09:43
                        • Cmyles / ++, Justin VanAbrahams , Wed, 24 Jul 2013 13:53:40
                • Re: ECU = Electronic Control Unit, Sunset Park, Wed, 24 Jul 2013 11:54:54

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