Need to know what the voltages are so I can check if the ECM is putting out the right voltages and if the wire loom has got a short in it?

CARLOVER2024

MEMBER
2007 HONDA FIT
0.5L
4 CYL
2WD
MANUAL
125 MILES

My vehicle listed above got a code for the upstream oxygen sensor. Replaced it now engine will not start and when it starts it stops right away will not run. I put a new crank sensor, new timing chain and gears, now it will start and run for a little while, but then it will stop and shut off and it will not start again until the engine is cold. Now I am trying to check the sensor. I had put a new crank sensor I want to check the cam wiring and the crank wiring to see if the values are right or if there’s a short anywhere in the loom. Thank you

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,864 POSTS

Hi,

As far as testing goes, do this first. When the engine stalls and won't restart, see if it starts if you use starting fluid. If it does and then stalls, we have a fuel related issue. If there is no change, check to see if there is spark to the plugs.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Next, I attached the diagnostics below for the crankshaft position sensor. The diagnostics are for a no signal condition, which would prevent the engine from starting. As far as the camshaft sensor is concerned, I'm running into trouble finding the same info. By chance, are there codes stored that would point me in the right direction?

Let me know.

Take care,

Joe

See pics below.

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Monday, June 10th, 2024 AT 8:12 PM

CARLOVER2024

MEMBER
2 POSTS

There was a code but the guy I'm fixing his car for took them out so I don't know what ther where he told me it wan for oxygen sensor and after he replaced it now it wont start or run it is getting spark and it’s getting fuel.

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Wednesday, June 12th, 2024 AT 12:24 AM

JACOBANDNICKOLAS

MECHANIC
108,864 POSTS

Hi,

If it has spark, fuel, air, compression, and the timing is correct, it has no choice but to run. You may be getting fuel to the engine, but the injectors may not be working.

At each fuel injector, there will be a yellow wire with a black tracer. That wire should have battery voltage at each injector when the key is in the run position. Check that for me.

Let me know.

Joe

See pic below.

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