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> L-Jetronic Dual Relay on 1.8, Followed the old thread but pumps now runs without key in ignition
motorvated
post Mar 15 2013, 10:26 PM
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My fuel pump was running continuously with the key in the "on" position, so I found the old thread dealing with wiring the dual relay properly and testing the Air Flow Sensor and followed the diagnostics and testing stated in there. Air Flow Sensor tested fine, wiring as specified, and now the pump runs with no key in the ignition. I think the pump was re-wired to run through the ignition switch, which I know was wrong. Now I think I may have a bad ignition side on the dual relay. The relay has two numbers on it. Ignition side says 071 906 059. The FI side says 0332 514 129. All connectors are designated on the relay with the same numbers in the same positions as the 120 that the old thread used. The old thread was great to follow as long as things went as planned. In this case, the result was a failure to operate correctly once all the wiring was reconfigured. Any help out there?
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timothy_nd28
post Mar 17 2013, 12:13 AM
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Much more sense! So the fuel pump has a new wire going to 88d. To recap, with the ignition to the on position, the fuel pump runs. Let's check for voltage at pin 86a with the ignition switch at the "on" position. You should have 0 volts present. If you have 0 volts at 86a, then remove the dual relay and ohm out pin 88y to 88d, you should have infinite resistance.
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motorvated
post Mar 17 2013, 07:45 AM
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QUOTE(timothy_nd28 @ Mar 17 2013, 12:13 AM) *

Much more sense! So the fuel pump has a new wire going to 88d. To recap, with the ignition to the on position, the fuel pump runs. Let's check for voltage at pin 86a with the ignition switch at the "on" position. You should have 0 volts present. If you have 0 volts at 86a, then remove the dual relay and ohm out pin 88y to 88d, you should have infinite resistance.


Yes, the fuel pump has a new wire to its + terminal and a new wire from the - terminal to ground. Seems like the ground for the pump can be simply mounting the metal body of it to the car, but I have it out so I ran the ground wire to be sure. And not only does the pump run when the ignition is in the on position, it runs when the ignition is in the off position as well. I'll do the voltage and resistance checks this morning.
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motorvated
post Mar 17 2013, 12:06 PM
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QUOTE(motorvated @ Mar 17 2013, 07:45 AM) *

QUOTE(timothy_nd28 @ Mar 17 2013, 12:13 AM) *

Much more sense! So the fuel pump has a new wire going to 88d. To recap, with the ignition to the on position, the fuel pump runs. Let's check for voltage at pin 86a with the ignition switch at the "on" position. You should have 0 volts present. If you have 0 volts at 86a, then remove the dual relay and ohm out pin 88y to 88d, you should have infinite resistance.


Yes, the fuel pump has a new wire to its + terminal and a new wire from the - terminal to ground. Seems like the ground for the pump can be simply mounting the metal body of it to the car, but I have it out so I ran the ground wire to be sure. And not only does the pump run when the ignition is in the on position, it runs when the ignition is in the off position as well. I'll do the voltage and resistance checks this morning.


Ok, zero volts at 86a with ignition on and off. This wire should only be hot 12 volts when cranking, correct? Pulled relay and checked resistance between 88y and 88d. Got zero resistance, meaning I have continuity between these two terminals. Here are some pictures to document
Meter not connected with leads apart reading 1ohm meaning infinite resistance and open circuit.
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Meter with leads touching, reading zero ohms, meaning continuous circuit.
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Meter attached to relay, reading zero ohms, meaning continuous circuit.
Attached Image
A couple pictures of my fuel pump, since you asked about it.
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Posts in this topic
motorvated   L-Jetronic Dual Relay on 1.8   Mar 15 2013, 10:26 PM
timothy_nd28   Sorry, I'm too lazy to re-read that old thread...   Mar 15 2013, 11:01 PM
motorvated   Sorry, I'm too lazy to re-read that old threa...   Mar 16 2013, 07:47 AM
timothy_nd28   Interesting, but it's fine, connector no conne...   Mar 16 2013, 10:17 AM
motorvated   Interesting, but it's fine, connector no conn...   Mar 16 2013, 02:29 PM
motorvated   Interesting, but it's fine, connector no con...   Mar 16 2013, 02:49 PM
timothy_nd28   Pin 86 on the relay works with the thermotime swit...   Mar 16 2013, 02:38 PM
timothy_nd28   I just read your little side note at the end, you ...   Mar 16 2013, 10:26 PM
motorvated   I just read your little side note at the end, you...   Mar 16 2013, 11:45 PM
motorvated   Correction, wire on 86c is coming off of + termina...   Mar 16 2013, 11:58 PM
timothy_nd28   Much more sense! So the fuel pump has a new w...   Mar 17 2013, 12:13 AM
motorvated   Much more sense! So the fuel pump has a new ...   Mar 17 2013, 07:45 AM
motorvated   Much more sense! So the fuel pump has a new...   Mar 17 2013, 12:06 PM
timothy_nd28   Good to hear 0 voltage on 86a, it means that your ...   Mar 17 2013, 12:19 PM
motorvated   Good to hear 0 voltage on 86a, it means that your...   Mar 17 2013, 12:38 PM
motorvated   Good to hear 0 voltage on 86a, it means that you...   Mar 17 2013, 01:03 PM
timothy_nd28   Yah, you're correct with the spring operation....   Mar 17 2013, 01:08 PM
motorvated   Yah, you're correct with the spring operation...   Mar 17 2013, 01:22 PM
timothy_nd28   It was my pleasure. I would give you my spare, bu...   Mar 17 2013, 02:15 PM


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