hard to start

Billybob · **Posted:** Thu Sep 26, 2019 9:24 am

If you are looking for the ECM pinouts, go to section 8W...wiring diagrams....at the end of the opening page you will see a section on "connector pinouts". You have to page through this section to find the ECM pinouts.....no Index! It is pretty difficult to find the correct pin as they are all very close together...best to have a look from behind to check the colors of the wire you are working with to check you are in the correct pin position.

The picture of the pinouts on the ECM only gives the wire numbers and the colors of the wires..not where they come from. Will give you some names like "GND" or "+5v supply". The start of Section 8W explains how to decode the wire colors…. the first character is the main color of the wire while the second character is the stripe going along the wire.

Start on the page that WWDiesel re-printed and highlighted and follow the wires to the ECM plugs.
Lucky for you these wires do not branch out all over the place via splices! :wink:

phum · **Posted:** Thu Nov 21, 2019 7:41 pm

Been a while, here is an update.

Couldn't find a problem with the factory wiring so out of frustration I ran 4 new wires , all checked and good but still an error code and poor running.

Voltages from sensor ,new sensor with key on not running
pin 1 ground
2 3.4
3 4.96
4 3.44
running
1
2 3.44
3 4.96
4 4.95

old sensor with key on
1
2 1.87
3 4.77
4 3.24
running
1
2 3.24
3 4.6
4 3.31

running voltages taken at 2000 rpm

question is, there is a great variation between voltages between sensors and not much voltage movement with revs

I now don't know if one or both sensors is faulty or the problem lies elsewhere.
I know I am a pain in the arse (so is this problem) but I have nobody else to help

flash7210 · **Posted:** Thu Nov 21, 2019 7:50 pm

Which sensor are you testing?

phum · **Posted:** Thu Nov 21, 2019 8:33 pm

MAP sensor

flash7210 · **Posted:** Thu Nov 21, 2019 8:45 pm

Pin 1 = grnd

Pin 2 = intake air temperature (IAT) signal

Pin 3 = +5 volts

Pin 4 = manifold pressure (MAP) signal

Edit: I’m not exactly sure what the MAP signal voltage should be.
I believe that lower voltage = lower pressure and higher voltage = higher pressure.

flash7210 · **Posted:** Thu Nov 21, 2019 8:47 pm

Also, a bad harness connector will create intermittent faults that will have you chasing your tail.

phum · **Posted:** Thu Nov 21, 2019 9:27 pm

flash7210 wrote:

Also, a bad harness connector will create intermittent faults that will have you chasing your tail.

Its the lack of voltage variation that worries me.

some where I saw a sensor plug with pigtails for sale but cant find it now. that would remove another possibility

Billybob · **Posted:** Fri Nov 22, 2019 4:19 am

phum wrote:

flash7210 wrote:

Also, a bad harness connector will create intermittent faults that will have you chasing your tail.

Its the lack of voltage variation that worries me.

some where I saw a sensor plug with pigtails for sale but cant find it now. that would remove another possibility

OK so you say that you replaced the 4 existing wires on the MAP Sensor with brand new ones as per my previous post and still get the P0108 code?

I would add a ground direct from chassis to the ground wire on the MAP sensor...Pin #1.

You cannot have too many grounds.....I have done this on some of my sensors to solve weird problems!

Make sure you are counting the pins correctly!

If that does not help....add a ground at the other end of the wire ie. pin 83 of ECM C1 and definitely make sure you are counting the pins correctly! :shock:

I believe the RHD 2006 CRDs do not have the wiring harness going behind the Fuel Filter Mounting Bracket....I do not have access to a 2006 CRD here in SA to check.... a UK owner I conversed with years ago told me this but it is worth checking this out.

Possibly there is a voltage drop while the engine is being turned over which is causing the spluttering at that time and which is setting the code.

Have you checked the ground from negative battery lead to chassis and from the engine grounding strip to chassis? Also the main ground to the ECM is shown on page 8W-15-2....a Black/Dark Green wire going
to pins 4,2 and 6 on ECM Plug C2. The location of the ground is on page 8W-91-27...it seems to be the ground shown in a previous picture being just below the windscreen on LHS of engine bay.

Rapidly running out of ideas here

flash7210 · **Posted:** Fri Nov 22, 2019 12:22 pm

phum wrote:

flash7210 wrote:

Also, a bad harness connector will create intermittent faults that will have you chasing your tail.

some where I saw a sensor plug with pigtails for sale but cant find it now. that would remove another possibility

Search for AC Delco PT1863

WWDiesel · **Posted:** Fri Nov 22, 2019 2:44 pm

flash7210 wrote:

phum wrote:

flash7210 wrote:

Also, a bad harness connector will create intermittent faults that will have you chasing your tail.

some where I saw a sensor plug with pigtails for sale but cant find it now. that would remove another possibility

Search for AC Delco PT1863

Another good source:
Most of the Mopar connectors can be identified in the Factory Service Manual by the connection number and then use the connection number or simply the items name to find the Mopar Part Number for the connector repair kit.
http://connectors.dcctools.com/home.htm

Example:
INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR (DIESEL) - 4 WAY
Full Repair Kit: 68080535AA

Billybob · **Posted:** Sun Nov 24, 2019 5:13 am

If you cannot find a new harness going to the MAP Sensor, check the female pins inside the harness connector that plugs onto the male MAP sensor.

On my old KJ I forced a thin section of fine Emory Cloth into the female contacts to clean them and then compressed the contacts together so that they would make good contact with the male MAP Sensor contacts.

The P0105 and P0108 codes should point to the MAP sensor but after pouring through the Wiring Diagrams following these codes I am only directed to the pages for the Gasser KJs....nothing for CRDs! :roll:

Yesterday I once again removed my MAP sensor on my 2002 Export 2.5 CRD to give it a good cleanout with some Brake Cleaner Spray. Lasts for a few months before another clean is required.
I also think I need to replace my Fuel Filter again soon...also gets gunged up rapidly!

Pin #2 was the wire I had to completely replace a few months ago!

I am using 10 ppm Diesel which in this case is made by a SA Government facility called SASOL who make diesel and petroleum from coal extracts mixed with oil products!

The other Diesel suppliers such as BP, Shell etc. only supply 50 ppm!

The 50 ppm diesel gunges up my MAP sensor and fuel filter even more!

phum · **Posted:** Mon Nov 25, 2019 3:08 am

IT GOES

Thanks to all who contributed, you knowledge and help was invaluable.
In the end I cannot say that it was one thing caused the problem, I think it was a combination.

Once again thanks to all

Billybob · **Posted:** Mon Nov 25, 2019 3:27 am

phum wrote:

IT GOES

Thanks to all who contributed, you knowledge and help was invaluable.
In the end I cannot say that it was one thing caused the problem, I think it was a combination.

Once again thanks to all

GREAT!

Probably a loose connection somewhere which you disturbed while fiddling about. :wink:

WWDiesel · **Posted:** Mon Nov 25, 2019 1:47 pm

phum wrote:

IT GOES
Thanks to all who contributed, you knowledge and help was invaluable.
In the end I cannot say that it was one thing caused the problem, I think it was a combination.
Once again thanks to all

That's wonderful news! We all love a happy ending. :BANANA:

I just hope it does not ever return again.

hard to start

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