In reply to a message from Win sent Sun 16 Mar 2008:
I assume that ‘Ferguson’ is your '93 car? If not, some of
the comments in here may not apply.
I produced this for someone a while ago - it may help you:-
DTC 29 trouble shooting guide
The ECM with the blue and yellow connectors is the
EMS engine control module.
That is the thing which is generating the FF29 code. If the
battery is good and the connections at the ECM are clean,
there must be another problem with the ECM or the wiring to it.
Here are the checks Jaguar recommend after checking that the
battery and the ECM connectors are OK:-
- Switch ignition ON
- Back probe individually ECM Yellow connector pin #1
(White/brown wire), ECM Blue connector pins #10 (White/brown
wire) and #22 (White/brown wire) and in each case accurately
measure the voltage to ground.
? Is there battery voltage at each of those pins?
? Are the voltage measurements within 200mV of each other?
*If NO to either of the above questions, repair the ignition
switched power supply to the ECM.
[Obviously for that you will need the wiring diagrams for
your car since it becomes quite involved. I recommend the
JDHT CD-Rom JHM1130 which has the requisite diagrams for
your car. HOWEVER, I would first suspect the EMS Main Relay,
the one in the Black base of that group of six on the
firewall in the engine bay. If that relay is suspect, it
could also be the cause of your ‘misfire’ symptoms].
If the answer to the above questions is YES:-
- Switch the ignition OFF
- Back probe individually ECM Yellow connector pin #18
(Black wire), ECM Blue connector pins #11 , #23 & #24 (all
Black wires) and in each case measure the resistance to
? Is there LESS than 1 Ohm resistance to ground at each pin?
If NO, you must find and repair the ECM grounds - one is
attached to the #3 inlet manifold, two are attached to the
bulkhead (firewall) behind the cylinder head.
If, after all of that and AFTER you have cleared the ECM
memory [disconnecting the negative battery lead for 30
seconds or removing the instrument pack fuse with the
ignition ON (but engine not running) for a few seconds], the
Check Engine light comes on and FF29 reappears when you
start the engine, Jaguar recommend that you REPLACE the ECM
The original message included these comments:
Ferguson really through a tantrum today.
First symptoms appeared as a miss at idle and the feeling of
Was surprised to see Fuel Fail 29 on the VCM and a search of
the archives really does not show all that many occurrences,
Has anyone found any causes/cures for FF 29? Heck! From the
archives, looks to be a very unusual failure. Has anyone
else even suffered such?
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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