Daimler DD6 1997:
In the last month, my DD6 has not always started on the first turn of the ignition - the dashboard lights come on, the heater/AC fan comes on, but nothing from the engine.
After a few re-tries, pressing/de-pressing the brake pedal and moving the gear from P down to R, then D, and back up to P again, hey presto, it comes to life and the engine starts!
Just wondered if anyone had experienced this problem and what it could be about.
It can be a bit unnverving when it doesn't start after the first few attempts.
Cheers, nice weekend all!
Matt

 

See this link for a current V - 12 with the same issues

https://www.jaguarforums.com/forum/x...estion-243441/

The inline 6 starting circuit is pretty close to the V - 12 but there are some differences

Do you always get starter rotation ?

If no do the next 2 lines

Does the starter solenoid relay click when it fails to turn over ?

You have to place your finger on the relay and feel for it as other relays in the area click at the same time

If Yes you can have a fueling problem and cycling the key overcomes this

With the rotation of the key the # 1 pump will come on for 4 seconds only and then shut off . Fuel pressure is trapped by a check valve at this point

This trapped fuel pressure should be enough to start the engine

Once the crankshaft position sensor sees engine rotation the ECU enables the # 1 fuel pump to run for the duration of your drive

This is a crash / safety feature

Full battery charge on the instrument panel ?

 

Many thanks!

No starter rotation. Silence other than the heating/AC fan starting.

Yes, full battery charge on the instrument panel.

Interesting part from the other thread you shared, is my "P" on the gearbox is no longer lighting up. That could be the issue.

 

A beginning point on starter trouble shooting is if the starter solenoid relay clicks or not

This breaks the problem into 2 basic parts

The Body processor Module must be satisficed after you hit the key that it sees certain things

Once it has meet it's requirements does the BPM provide a command ground closing the starter solenoid relay

Depending on if this relay clicks do you look at the other side of the system being the starter / solenoid assembly or the " battery heavy power " to it and the paths it gets there

The heating / A/C fan relays are inside the car , see the " LWB " PDF at the very bottom of the post , page 18 for the left and right blower motor relays just below the passengers seat

The large A/C compressor clutch relay up front under the bonnet has the same part # and can be used as a starter solenoid relay swapping option

This is on page 17 of the " LWB " PDF



We will be using this document below to resolve your issue mainly on page 48 for your V - 12 :

You can double click it for a better picture





The inline 6 and V - 12 starting systems are similar but there are some differences





http://www.jagrepair.com/images/Auto.../jagxj1997.pdf

On the V - 12 the linier switch which is a long switch assembly above the floor pan on the right side of the shift lever

A recent picture from Oliver Marks on his V - 12 as the long black rectangler box



The " P " light itself comes from the Mode switch which is a small micro switch that is not needed in the starter circuit but corresponds to the same gear shift lever position

You will see it as the 4 wires pigtail coming from it

The 2 fuses for the starter solenoid relay are the power # 3 / 26 amp left engine fuse box witch is hot at all times . And the # 12 / 10 amp right engine fuse box which relys on the right engine fuse box relay ( ignition positive relay ) to close . You can swap this one with the left engine fuse box relay because in reality it is the horn

Page 66 of the Wiring Guide

The brake switch in the schematic is on the brake pedal as there are 2 brake switches on the pedal as one package with 4 wires with connector CA72 , reference page 78 . This is also used in the cruise control

Thinking

 

See also this v short video of the microswitch by the gearshift in action, you should hear the relay click as it engages (no noise here, I was just looking at the interaction having tweaked the little connector prong out)

 

Oliver ,

The white micro switch controls the gear shift interlock

There is the spring that should hold the shift lever in the gate / detent but is a redundant system

In making the switch to contact the # 1 blue strip left relay should click with the larger clunk of the solenoid in the shift lever package

You might have to remove the # 2 relay to better feel the # 1 relay and is a swapping option

See your wiring guide page 68 left side of print Not In Park Microswitch

It feeds the BPM but there is 3 independent things going on in the shift lever package

See page 20 of the " LWB " pdf below

 

thank you!

 

By removing 2 of the 4 bolts on one side of the transmission crossmember and only backing off the other 2 on the other side ( keeping the threads engaged as a locator ) you can place a jack under the transmission and tilt the engine back

At least on the inline 6

Raise the hood first as the front of the engine will rise

With the exhaust system loose you can do this if it aids in assembly

 

Oliver ,

Is the new starter solenoid a black colored Bosch stamped manufacture with a certain part number ?

There is a split in the sheet metal where the right quarter panel meets the metal going across to the left side underneath the black plastic wiper mechanism cover

This split can leak rain water onto the ECU connector used in the starter circuit , easy silicon reseal

The cover screws are plastic and break , pernitrate spray first

You may be dried out after the rain which also may be a correlation with possible water ingression of the security module connectors through the fuel filler cap well when the drain line clogs . Someone found their well cracked or damage and then the seal of the well as it fills to the upper car skin can be imperfect

Easy connectors to check are the Papa Indy 1 and on the opposite left side of the engine the Papa Indy 63 . both have started circuit wires running through them

Papa Indy 1 pin position # 2 Green Circle ( green / black ) wire

Papa Indy 1 pin position # 4 Blue circle ( white / pink ) wire

Papa Indy 63 pin position # 5 Red circle ( red / blue ) wire

Papa Indy 63 pin position # 9 Orange circle ( light green / black ) wire

The RS3 connector below the inertia / crash switch pin # 11 Purple circle ( green / black ) wire , this is the same 48 pin type connector as the trunk BT4 so not easy to deal with but where I had a defect and bad connection






And then we get to the large 48 pin connector above your fuel tank . This connector ( BT4 ) can be a pain to reconnect . There is a layer of sheet metal cutout that the connector settles down in , On my BT4 the cutout was off centered and hitting the connector halves edges not allowing it to reconnect easily