ECM/FUEL PUMP/PULSE GENERATORS


Information and questions on GL1500 Goldwings (1988-2000)
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rider1939
Posts: 61
Joined: Wed Jun 09, 2021 4:20 pm
Location: MARION,MA,
Motorcycle: 2000 1500SE
1995 GL1500SE - parts bike
1979 GL1000 - NAKED
1994 HONDA VFR
1974 DUCATI GT 750
1978 DUCATI GTS900
1978 DUCATI DARMAH
DUDA = DUCATI 500 FRAME WITH HONDA CB500 MOTOR
MT3 = MOTO GUZZI POWERED 3 WHEELER

ECM/FUEL PUMP/PULSE GENERATORS

Post by rider1939 »



'95 GL1500SE

I've read in several posts, under "NO SPARK", that the fuel pump doesn't/won't run nor will the tachometer register, if the pulse generators are not working.

Is this true, or is it just some years/models ? ? ?

Thanks


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DenverWinger
Posts: 2441
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
'80 GL1100 STD Vetter (2005-)
'93 GL1500 Aspencade (2017-)
'83 Trav-Lite Camper (2010-)
Past rides
'72 CL350 (1980-1988) sold
'78 Suzuki GS550 (1985-2005) sold
'77 GL1000 (2002-2006) sold

Re: ECM/FUEL PUMP/PULSE GENERATORS

Post by DenverWinger »

On a 1500 90-2000 1500 If the PG is out, Tach won't register anything while cranking, won't be a spark, and fuel pump will only run while cranking starter. 88-89 models the fuel pump will run a second or two when ignition is first switched on, then stop.
A local inventor has figured a way to turn a sausage grinder backward to manufacture pigs. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
~Mark
User avatar
rider1939
Posts: 61
Joined: Wed Jun 09, 2021 4:20 pm
Location: MARION,MA,
Motorcycle: 2000 1500SE
1995 GL1500SE - parts bike
1979 GL1000 - NAKED
1994 HONDA VFR
1974 DUCATI GT 750
1978 DUCATI GTS900
1978 DUCATI DARMAH
DUDA = DUCATI 500 FRAME WITH HONDA CB500 MOTOR
MT3 = MOTO GUZZI POWERED 3 WHEELER

Re: ECM/FUEL PUMP/PULSE GENERATORS

Post by rider1939 »

DenverWinger = = = Thanks for the info, much appreciated.
User avatar
rider1939
Posts: 61
Joined: Wed Jun 09, 2021 4:20 pm
Location: MARION,MA,
Motorcycle: 2000 1500SE
1995 GL1500SE - parts bike
1979 GL1000 - NAKED
1994 HONDA VFR
1974 DUCATI GT 750
1978 DUCATI GTS900
1978 DUCATI DARMAH
DUDA = DUCATI 500 FRAME WITH HONDA CB500 MOTOR
MT3 = MOTO GUZZI POWERED 3 WHEELER

Re: ECM/FUEL PUMP/PULSE GENERATORS

Post by rider1939 »

About the Pulse Generators.

Should they be receiving any voltage, if they do, what is the expected voltage range ? ? ? Mine don't show any voltage.
User avatar
DenverWinger
Posts: 2441
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
'80 GL1100 STD Vetter (2005-)
'93 GL1500 Aspencade (2017-)
'83 Trav-Lite Camper (2010-)
Past rides
'72 CL350 (1980-1988) sold
'78 Suzuki GS550 (1985-2005) sold
'77 GL1000 (2002-2006) sold

Re: ECM/FUEL PUMP/PULSE GENERATORS

Post by DenverWinger »

You shouldn't see any DC voltage on them.

They should read 400-500 ohms, and if you switch the meter to AC volts you should see them generate a very low AC voltage (way less than a volt, tiny AC pulses actually) when you crank the engine. It's these tiny pulses that the ECM uses to detect crankshaft position to control and properly time the spark. If the pulses are missing you have no spark.


A local inventor has figured a way to turn a sausage grinder backward to manufacture pigs. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
~Mark
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