Mk1 Jazz cranking but not starting

[Alan Hobbett]

Any thoughts. The fuel pump doesnt seem to be working yet when I take it out and connect direct to battery it operates fine. Ive changed the relay - nothing and the fuel pump- nothing.  Any ideas?

[Jocko]

Check the fuel pump has a good earth. Try a wire from the body to a sound earth, even the battery earth.

[madasafish]

Check the fuses

[Jocko]

Check the fuses

I assumed he had checked the fuses before going to the trouble of changing the relay and removing the pump to test it, but if not then the fuses should be checked, first and foremost.

[VicW]

The fuel pump doesn't seem to be working   Any ideas?

Does the fuel pump not run at all? When you first select position two with the ignition key you should hear the pump run for a few seconds until it pressurises the fuel rail. I am not familiar with the fuel pump but it presumably has an electrical connect plug, if so check that there is a supply getting to the pump.
You may of course have an ignition problem.

Vic.

[Alan Hobbett]

Check the fuses

I assumed he had checked the fuses before going to the trouble of changing the relay and removing the pump to test it, but if not then the fuses should be checked, first and foremost.

Thanks madasafish and Jocko. Yup, checked the fuses first out. I'll try the earth Jocko. Cheers.

[Alan Hobbett]

The fuel pump doesn't seem to be working   Any ideas?

Does the fuel pump not run at all? When you first select position two with the ignition key you should hear the pump run for a few seconds until it pressurises the fuel rail. I am not familiar with the fuel pump but it presumably has an electrical connect plug, if so check that there is a supply getting to the pump.
You may of course have an ignition problem.

Vic.

Thanks Vic. I'm not getting anything from the fuel pump at all, whether ignition position 1 or 2. I've taken the pump out and run leads direct from battery to terminals and it whirls away fine. So pump itself works okay, which suggested to me it was the power supply to it.  Changed the relay but still just the same.

Jocko, I do wonder about the earth connection at the pump. I'm an electronics moron so no real idea what I'm doing here but I had a poke about with a multi meter and I could get a reading at the connector from one of the connections. There are five connections at the connector which also serves the fuel level gauge. This displays fine when ignition tuned on, so the power must be flowing fine through that. How do I check the earth at the pump?

Cheers All

Alan

[sparky Paul]

On the pump connector, the ground to the pump should be a black wire with no tracer. Yellow/Green is the feed to the pump.

With the pump connected, put the multimeter on dc volts and measure from a good earth on the chassis to each of the terminals in turn. If you get no reading from either terminal when the pump should be running, there is no feed to the pump. If both read high, near battery volts, the earth to the pump is bad.

Which relay have you swapped? PGM-FI RELAY 2 in the dash fusebox?

Is there any chance the inertia switch could have been tripped?

[Jocko]

[sparky Paul]

Here's the fuel pump circuit troubleshooting guide from the workshop manual, might be helpful.

http://www.hondafitjazz.com/manual/a00/html/q1/saa4eq1a20326428302faat00.html

[Kremmen]

The 8th Gen Civic has an under dash fuel cutoff switch that triggers when it detects a serious 'thump'. It's easy to reset, just a press button'.

Does the Jazz have a similar button ?

On the Civic it can be triggered by just banging the dash side trim back into place.

Picture here, post #7 : https://www.civinfo.com/threads/fuel-cutoff-inertia-switch.5716/#post-74709

[Alan Hobbett]

Jocko, Sparky Paul and Kremen. Thanks very much. I'll work this through and hope for some joy. Appreciate your help. Guys. Thanks

[guest9236]

Having read the comments and location etc of The fuel cut off Inertia switch,
a thought occurs to me, but perhaps I am incorrect Wouldn’t this switch make an excellent ANTI THEFT Device.
Just a thought but any observations would be of interest please.

[Westy36]

Having read the comments and location etc of The fuel cut off Inertia switch,
a thought occurs to me, but perhaps I am incorrect Wouldn’t this switch make an excellent ANTI THEFT Device.
Just a thought but any observations would be of interest please.

I think I would prefer to rely on the cars built in Thatcham apporved immobiliser. Safer than using a switch that is not desigened to be used. 

[sparky Paul]

Having read the comments and location etc of The fuel cut off Inertia switch,
a thought occurs to me, but perhaps I am incorrect Wouldn’t this switch make an excellent ANTI THEFT Device.
Just a thought but any observations would be of interest please.

I think I would prefer to rely on the cars built in Thatcham apporved immobiliser. Safer than using a switch that is not desigened to be used. 

Actual drive-away car thefts are rare these days, with the event of chip-in-key immobilisers. If a car is valuable enough to be worth the effort, they will break into the house for the keys, or pull them onto a lorry.

If you did want to stop anyone making off with the keys and the car, you could but a secret switch in series with the inertia switch... otherwise, you would have to hit the inertia switch with a mallet every time you wanted to immobilise the car!