89 won't run
Team Owner
Joined: Jul 2004
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From: Hartford WI
Race Director
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From: Lansing MI
Do you know what they call a man who has made every mistake possible in his field of study ??
An Expert.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
Race Director
Joined: Oct 2008
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From: Lansing MI
I would have to see the schematic. I can tell you that service manual updates come around almost as often as service bulletins. What is more likely is the schematic you are looking at it providing an incomplete picture of the circuit. Done so for simplicity.
Supporting Vendor
Joined: Oct 2004
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Likes: 68
If you look at schematic I attached it clearly states "crank only". Then I read the written word which says ...... ignition pulses - bla-bla -bla .......
So the written word diverges from the schematic - I was going by the schematic only - so much for that !!!! Sorry !
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Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Schematic is correct - no problem there. FP relay is in parallel with PCM and engine oil pressure switch. That's what the FSM manual shows. I have the original manuals which is why mine are also in color.
If you look at schematic I attached it clearly states "crank only". Then I read the written word which says ...... ignition pulses - bla-bla -bla .......
So the written word diverges from the schematic - I was going by the schematic only - so much for that !!!! Sorry !
If you look at schematic I attached it clearly states "crank only". Then I read the written word which says ...... ignition pulses - bla-bla -bla .......
So the written word diverges from the schematic - I was going by the schematic only - so much for that !!!! Sorry !
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Looks pretty straight forward and I was a electronic bench technician for 10 years and did a little circuit design on a T1 multiplexer as well.
Race Director
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From: Lansing MI
Supporting Vendor
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FP Relay
VIN 8 Driveability & Emissions
I may scan later but a PIA for me as I must switch to XP - Old Canon scanner won't work on '7' ! lol
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Supporting Vendor
Joined: Oct 2004
Posts: 761
Likes: 68
Actually it'd make more sense to me if the PCM only supplied the 2 second pulse and then the oil pressure switch took over ! That's what the schematic implies. So if the PCM does see ignition pulses and runs the relay then why the oil pressure switch ? Back-up - why - if the PCM dies where you going ?
Drifting
Joined: Feb 2006
Posts: 1,423
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From: Magnolia Tx
Actually it'd make more sense to me if the PCM only supplied the 2 second pulse and then the oil pressure switch took over ! That's what the schematic implies. So if the PCM does see ignition pulses and runs the relay then why the oil pressure switch ? Back-up - why - if the PCM dies where you going ?