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no crank

  • ronald316
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4 years 2 months ago #50526 by ronald316
no crank was created by ronald316
this car got towed from another shop its a2017honda civic 2.0 it wont crank i tested the wire from relay moduale in fuse box grey it cranks when adding power i have crank sense at relay box from ignition .i think they put a used relay box it sit in fuse box it can slide out with 3plugs it has a circuit  board inside does it need to be programed.any help would be great

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4 years 2 months ago - 4 years 2 months ago #50537 by guafa
Replied by guafa on topic no crank
Hi Ronald,

So you bypassed start relay and it cranked (but no started)?. Which means you have ignition voltage. 

Do you have 5v reference with ignition switch on?. You can check it on TPS for intance.
Last edit: 4 years 2 months ago by guafa.

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4 years 2 months ago #50542 by ronald316
Replied by ronald316 on topic no crank
yes i have power going to it in crank but no crank if i power grey wire starter solenoid it will crank

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4 years 2 months ago #50544 by guafa
Replied by guafa on topic no crank
*Is it CVT or Manual transmission?
*Is it hatchback, sedan or coupe?

Confirm whether or not you have 5v ref voltage on TPS sensor

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4 years 2 months ago #50546 by ronald316
Replied by ronald316 on topic no crank
its sedan auto cvt trans

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4 years 2 months ago #50547 by ronald316
Replied by ronald316 on topic no crank
ok i ll check tomorrow

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4 years 2 months ago #50573 by jreardon
Replied by jreardon on topic no crank
Also, is this the LX without Keyless Access System? Because I only see a gray wire on this one and none others.

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4 years 2 months ago #50575 by ronald316
Replied by ronald316 on topic no crank
its a ex

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4 years 2 months ago #50576 by ronald316
Replied by ronald316 on topic no crank
ok here is were im at got immobalizer fixed did a systeme check with autel ultra it says its normal no codes for security now .now if i power grey wire with power probe it starts.won t come out of park and wont crank with key

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4 years 2 months ago - 4 years 2 months ago #50582 by guafa
Replied by guafa on topic no crank
Hi guys,

Ronald. Due to you confirmed that when you power grey wire it not only cranks but it starts, we can assure PCM is powering sensors (5v reference is on).

*When you power grey wire (A2 relay terminal), you are bypassing relay and directly powering starter solenoid. 

*A5 relay terminal is the ground of relay coil (which is connected to groung through range switch on Park or Neutral).

*A1 relay terminal is power ignition, which feeds power not only for relay coil but relay contact which feed starter solenoid (when relay is active). have you checked for this voltage when ignition switch on start (only when cranking)?
Last edit: 4 years 2 months ago by guafa.

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4 years 2 months ago #50591 by ronald316
Replied by ronald316 on topic no crank
thats correct when i power a2 grey it bypasses relay i have power on a1 when cranking and a5 has a ground

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4 years 2 months ago #50595 by jreardon
Replied by jreardon on topic no crank

its a ex
 EX sub model has Keyless Access System so I think it has another relay in addition to the one you just checked. The two relays must both be energized by the PCM for the load side contacts, which are wired in series, to send voltage to the starter solenoid.Check for power on B4 and ground on A4, while cranking

imgur.com/a/AOrDT8R

 

File Attachment:

File Name: relaycircu...test.pdf
File Size:459 KB


 

File Attachment:

File Name: wd_2021-08-10.pdf
File Size:179 KB

 

File Attachment:

File Name: wd1.pdf
File Size:113 KB

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4 years 2 months ago #50698 by ronald316
Replied by ronald316 on topic no crank
i have no continuaty on any of the terminals

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4 years 2 months ago #50699 by ronald316
Replied by ronald316 on topic no crank
on the terminals in diagram

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4 years 2 months ago #50709 by jreardon
Replied by jreardon on topic no crank
Try hitting it while cranking? The diagram of the terminals can get confusing in these. They can be from the back side of the connector or the front so I'd check them both ways to make sure SI is correct.

Anything else not working besides the starter? Rear brake lights, truck/ceiling light, power to ignition coil and injectors and windshield squirter? Are the terminals clean and tight? If the relay ground controls are present from the PCM in the connector, but no continuity in the relay I think you're going to have to get your hands on a replacement or perhaps you may resort to opening this box up who knows, maybe a solder reflow is in order? Crack it open and show us pics if you can :)

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4 years 2 months ago #50710 by ronald316
Replied by ronald316 on topic no crank
everything works excetpted start and wont come out park

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4 years 2 months ago #50711 by ronald316
Replied by ronald316 on topic no crank
i ll check thanks

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4 years 1 month ago #50883 by ronald316
Replied by ronald316 on topic no crank
ok has it turn out it was the starter relay box.and also the testing diagrams i got you test them from the back of plug thanks fot all the help

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4 years 1 month ago - 4 years 1 month ago #50917 by jreardon
Replied by jreardon on topic no crank
Does it come out of park?

Where did you find this relay box (relay circuit board) ? I can't find a place that sells this on google :(
Last edit: 4 years 1 month ago by jreardon.

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4 years 1 month ago #50918 by ronald316
Replied by ronald316 on topic no crank
had to the whole fuse box
The following user(s) said Thank You: jreardon

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