Hi, does anyone have a wiring diagram for the above?

I have no spark and no rpm in live data when cranking. RPM sensor appears to be in Distributor unit, need to scope but can't find diagram for this engine, only for other 1.4's and they are wrong. there are 2 plugs and about 8-9 wires going to the unit.

Thanks for any help

Steve

Hi Steve,

Most Honda distributors are usually quite simple to work out with out a wiring diagram,

Yours sounds like it has a 2 pin plug which would normally give you coil/module supply (usually black/yellow) and coil neg/tach (usually blue). You should then have an eight pin multiplug with 7 positions poppulated, 6 of which will be paired off to each other and are usually adjacent pins. These will be for Engine speed (multiple sinewaves), No 1 cyl id(1 sinewave), and crank position(4 sinewaves). Each with its own individual no of sinewaves on one revolution of the distributor.

I am assuming inductive sensors, expect a resistance of between 500 and 3000 ohms. The final pin will be the Spark Out(ford term SPOUT) from engine ECU which is the trigger signal to the module.

Note this information is off the top of my head and meant as a guide so may not be accurate.

Hope this helps,

Mike

Doesn't the RPM sensor built into distributor activate the start of injection, normally you can remove dizzy, spin by hand and listen for the clicking of injectors. If you hear the clicking then RPM sensor is working. (i'm sure this is correct.

According to my data fuse number 9 in under bonnet fuse box is for igniton coil but have no wiring diagram.

Also may be worth a look, has it got a fuel cut off switch which on some cars stop igntion circuit as well.

Hi Lee,

Dont think the RPM sensor will perform this function as it has no specific reference point but CID or CKP may well do this. rpm sensor may triger fuel pump relay though.

Mike

Steve,

Mike has described the normal Honda connection setup perfectly.

You can see two pages of a similar wiring diagram here:-

http://www.maccmot.com/download/CivicIgn1.pdf
http://www.maccmot.com/download/CivicIgn2.pdf

If these don't correspond with yours then I may have a paper based manual somewhere and will have a hunt for it in there.

Regards

Sean

sorry,

i thought the CKP and RPM sensor were both the same item but now i've looked at a wiring diagram for another honda its a different component.

Thanks for the replies. Had another hour on this today and found the following

1. Ignition on - fuel pump primes, stops, and doesnt start again when cranking.

2. No spark and no injector pulse

removed the dist cap and can see the following

1. Coil with 2 wires: 1 black/yellow which is battery voltage when cranking, the other (green)has no signal on it

2. What looks like may be an amplifier from which the green on the coil goes to along with a further 3 wires. 1 is black yellow (spliced in to the same as the coil 12v when cranking, the other 2 no change when cranking

3. A sensor pointing at a toothed wheel on the dist. shaft (is this the engine speed sensor?) This has 2 wires, which produce a clean sinewave peaking at 1v when cranking. Traced these two wires back to the ecu at which point they are 1 blue and the other white. I have the same sinewave signal at the ECU
4. 4 more wires disapear off underneath the dist. baseplate so I cant see what they go to and ran out of time to scope them. Will do this tomorrow.

I double checked the live data and I have no rpm signal, immo is shown as 'run' and all other date looks correct and alters when it should (throttle position etc) so I have no reason to suspect scanner issue.

ECU has the following on a sticker:
E53 OKi (UK) Limited Made in UK!
37820-pij-eis


Will update after next look.

Cheers

Steve

Did you eventually get to the bottom of this Steve? I have a civic with the exact same symptoms as yours! All powers and grounds are correct and scoping at the ecu I have 3 clean scope patterns relating to the sensor it is sent from. Yet still no trigger from the ECU and no rpm in live data. There is no evidence to condemn the ECU, no fault codes and MIL lamp comes on for 2 seconds and then goes out... Baffling

Cheers
Ben