2005 Mini Cooper S - No start problem - MINI Cooper Forum

First Generation Faults & Fixes MINI faults and fixes 2001 - 2006

User Tag List

 
LinkBack Thread Tools Rate Thread
post #1 of 3 (permalink) Old Mar 18th, 2014, 05:25 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2014
Local Time: 09:52 AM
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

United States
 
United-States 2005 Mini Cooper S - No start problem

Greetings everyone,

My trusty R53 has developed an electrical problem which I've been working to solve for the last few days. Unfortunately its intermittent making it all the harder to trace.

When I put the key in the ignition and turn it to on, usually I get several dash warning lights, hear the fuel pump and heater fan startup, the starter turns the engine over as normal and the car starts. Recently when I turned the key to On, I got one dash light (Door Ajar, I think) no fuel pump and no heater fan. The starter would still turn the engine, but it doesn't start. After a few tries, the fuel pump and heater fan startup, the several dash lights come on it starts as normal.

I've tried to trace the problem through the various control units and relays, but haven't been able to solve it yet.

As far as I can tell, this is not an EWS problem because the starter always turns. If I don't push the clutch pedal in, the starter doesn't turn, indicating the Body Control Module is getting the correct signals from the clutch switch and key code. Plus, all the other Body Control functions, door locks, windows etc. all work fine.

I've got the manual and the electrical diagrams, but am having some problems interpreting them. As far as I can tell, with the ignition switch on, the main relay should energize which in turn triggers several more relays, but haven't found how in the sequence the fuel pump relay is energized.

Does anyone have any ideas or can point me to a reference showing the startup sequence?

Ciao
Simon
Wintersroadshow is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old Mar 19th, 2014, 01:39 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2014
Local Time: 09:52 AM
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

United States
 
United-States Latest findings - still not fixed

Greetings everyone,

Last night I did some more troubleshooting and went through the Bentley manual.

As far as I can tell, with the Ignition On I should have voltage to fuse F34 in the drivers (US Model) kick panel which is a wake up signal to the engine DME. For some reason I do not.

The diagrams seem to so show that F34 should be turned on by the ignition key, but K6300, the Main relay, also seems to play a role here which I don't understand. The manual also shows the fuel pump relay K96 being triggered by the DME as well, which is also not working.

With the battery disconnected I swapped relays K6300 and K19, the first two relays in the engine compartment fuse box, but that made no difference. Still no voltage to F34.

In order to simplify this, I'd like to concentrate on the Fuel Pump and fuse F34. Can someone give me an idea of how I can test the voltage to F34 or trace where it is meant to come from? It almost looks like it come directly from the Ignition key, but I'm not sure.

Thanks
Simon
Wintersroadshow is offline  
post #3 of 3 (permalink) Old Mar 21st, 2014, 02:58 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2014
Local Time: 09:52 AM
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

United States
 
United-States Problem solved

Hi Folks,

My Mini is back up and running and is apparently a very happy camper. The problem ended up being the ignition switch itself. The fuse I mentioned in the previous post F34 does indeed turn on the Engine Computer, the DME, which in turn turns on the Fuel pump via a few relays. F34 is fed by the Ignition switch.

In my case, the switch contacts were dirty possibly due to the normal arcing that occurs. The odd thing was that they measured 0.1 ohms, but as soon as any current was applied, the voltage would fall to zero. This indicated that the switch could handle the tiny amount of current that a meter uses to measure resistance, but could not handle higher currents used in operation. If you search the web you'll find quite a few posts about faulty ignition switches so this seems to be a common enough problem. The issue appears to be the design of the switch. It uses a leaf spring that pushes the contacts together. A tumbler with eccentrics turns and pushes the contacts apart or allows them to touch. Since there is no wiping action between the contacts, there is no method to clean the arc pits that occur and they build up until the switch is faulty. Most other ignition switches that I've seen, use a rotary action that wipes the contacts against each other.

The solution was to disconnect the battery, take out the switch, a fairly easy process, take it apart and clean the contacts with some emery paper or similar. Put it all back together and test.

I hope this helps someone in the future who has a similar problem.

Cheers
Simon
Wintersroadshow is offline  
Thanks for this post from:
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MINI Cooper Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
2014 MINI Cooper Hardtop Revealed AutoGuide.com MINI News 15 Apr 23rd, 2015 03:15 PM
mini cooper s cold start problem njsupplies General Discussion 6 Mar 19th, 2015 09:00 PM
R56 Mini Cooper Erratic surging at idle from cold start Norfolk-Mini Second Generation Faults & Fixes 6 Mar 13th, 2014 03:12 PM
Please help! My car won't start & makes clicking noise... 2003 Mini Cooper Tyna General Discussion 3 Feb 1st, 2014 09:38 PM
2010 Mini Cooper S starting up problem Master_Yi Second Generation Faults & Fixes 2 Oct 19th, 2012 06:37 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome