1989 Honda Prelude 2.0si DOHC temp sensor wiring

HENRYHEPBURN

MEMBER
1989 HONDA PRELUDE
4 CYL
2WD
MANUAL
185,000 MILES

I have two temp sensors near thermostat in addition to guage sensor. High and low sensor I believe. I need to get the wiring straight to the sensor plugs, it's been reworked several times and the colors don't match the plugs that replaced the old ones. Is there a schematic that I can download from the net, I get a code on ecu 9-6, no check engine light! Thanks

5 Replies

JAMES W.

MECHANIC
2,394 POSTS

Is your engine fuel injected or carbed? It makes a difference in the wiring diagrams. Please advise.

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Monday, March 30th, 2009 AT 11:53 AM

HENRYHEPBURN

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Fuel Injected!

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Monday, March 30th, 2009 AT 11:55 AM

JAMES W.

MECHANIC
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Well, here we go. The diagrams for your car are not very clear. BUT, I hope this will help;
Gauge sender Single red wire.
Temp sensor for EFI yellow W/Grn & White W/Grn
Temp sensor ECM yellow W/Grn & White W/Grn

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Monday, March 30th, 2009 AT 9:38 PM

HENRYHEPBURN

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Thank you! I was surprised to hear that the temp sensors are the same color, perhaps the same, because my two sensors are differnt colors with different numbers on them. I'll have to look into that. Thanks again!

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Monday, March 30th, 2009 AT 9:56 PM

JAMES W.

MECHANIC
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As I mentioned, my diagrams weren't very good. The only difference in the sensors is calibration. If you happen to hook them up backwards it won't damage anything, you'll just have to switch them around if you have performance problems.