[v12-engine] 36cu diagnostic codes explaned.here they are :-)

V12-Engine
1

1994 Jaguar XJ-12 V12-5994cc 6.0L SOHC ref Page 1
Computers and Control Systems: Diagnostic Trouble Code Tests
and Associated Procedures
Code 13
36CU DTC FF13 PCMF MAP SENSOR SIGNAL
This DTC looks for a fluctuating vacuum signal during
starting and monitors vacuum ‘V’ throttle position when the
engine is running.
Code 14
36CU DTC FF14 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) CIRCUIT
This DTC looks for the ETCS signal voltage out of range or
static during engine warm-up.
ref Page 2
Code 16
36CU DTC FF16 INTAKE AIR TEMPERATURE SENSOR (IATS) CIRCUIT
This DTC looks for the IATS out of range.
Code 17
3GCU DTC FF17 THROTTLE POSITION SENSOR (TPS) CIRCUIT
This DTC looks for the TPS signal voltage out of range.
ref Page 3
Code 18
36CU DTC FF18 AND FF19 THROTTLE POSITION SENSOR (TPS)
CALIBRATION
DTC FF18. This DTC looks for low TPS signal voltage at
high load (MAP).
DTC FF19. This DTC looks for high TPS signal voltage at
low load (MAP).
Code 19 ref Page 4
36CU DTC FF18 AND FF19 THROTTLE POSITION SENSOR (TPS)
CALIBRATION
DTC FF18. This DTC looks for low TPS signal voltage at
high load (MAP).
DTC FF19. This DTC looks for high TPS signal voltage at
low load (MAP).
Code 23
36CU DTC FF23 FUEL SUPPLY
This DTC uses the HO2S signal. The feedback integrator
signals (both banks) have been on the rich or lean clamps.
Changes to the mixture have
brought the fuelling back into control. ref Page 5
Code 34
36CU DTC FF34 AND FF36 FUEL INJECTORS (FI)
This DTC uses the HO2S signal. The feedback inegrator has
been on the rich or lean clamp on one bank. Changes to the
mixture have brought the
fuelling on that bank back in control. ref Page 6
Code 36
36CU DTC FF34 AND FF36 FUEL INJECTORS (FI)
This DTC uses the HO2S signal. The feedback inegrator has
been on the rich or lean clamp on one bank. Changes to the
mixture have brought the
fuelling on that bank back in control. ref Page 7
Code 44
36CU DTC FF44 AND FF45 HEATED OXYGEN SENSOR HO2S CIRCUIT
DTC FF44 and FF45 monitor the HO2S signal for the correct
output. The feedback integrator on one or both banks has
been on clamp. Changes
to the mixture have produced no response from the HO2S and
the integrator has remained on clamp. ref Page 8
Code 45
36CU DTC FF44 AND FF45 HEATED OXYGEN SENSOR HO2S CIRCUIT
DTC FF44 and FF45 monitor the HO2S signal for the correct
output. The feedback integrator on one or both banks has
been on clamp. Changes
to the mixture have produced no response from the HO2S and
the integrator has remained on clamp. ref Page 9
Code 49
36CU DTC FF49 BALLAST RESISTOR CIRCUIT
This DTC monitors that the Ballast Resistor is connected
electrically. ref Page 10
Code 67
36CU DTC FF67 SECONDARY AIR INJECTION SYSTEM (AIR)
This DTC monitors monitors the effect of Air Injection on
the HO2S signal under test conditions. ref Page 11
Code 77
36CU DIC FF77 SPEED SIGNAL FROM PCMI
This DTC detect intermittent loss of the speed signal from
the Ignition System. It will not detect a missing speed
signal on cranking. ref Page 12–
thewytchdoktor=v12 fun!/94 xjs 6 litre/ s=k.log w
Winchester Virginia, United States
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2

In reply to a message from wytchdoktor1 sent Wed 13 Jan 2016:

more base information is on the way for the 6l v12’s as time
and motivation and careful study/implementation permits.
the information provided is to provide a better and
hopefully simplified explanation for the processes these
engines use and information the systems can display in
factory form where possible.
time to help to eliminate some of the guesswork that happens
because so few jag dealerships ret5ain the information we
require and they need for proper repairs to stock vehicles.
i am still looking for factory software to more easily delve
deeper into the digital guts(programming) of these controllers.
looking into the possibility of turning these butter knives
into scalpels(or at least sharp steak knives).
gotta start somewhere(besides ripping out the factory
programmed chip and replacing with an aftermarket one and
then writing the firmware and maps for said chips).
the goal being to install accessible programming from a cd
and adapter cable into the factory control head.
for now…the posts start here(and on the v12 posting area)
for those who wish to know how and what makes these things
tick(or not when things fail).
=dok=–
thewytchdoktor=v12 fun!/94 xjs 6 litre/ s=k.log w
Winchester Virginia, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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3

In reply to a message from wytchdoktor1 sent Wed 13 Jan 2016:

Enjoy!

http://www.jag-lovers.org/snaps/snap_view.php3?id=1402280159

Steve–
The original message included these comments:

more base information is on the way for the 6l v12’s as time
and motivation and careful study/implementation permits.
the information provided is to provide a better and
hopefully simplified explanation for the processes these
engines use and information the systems can display in
factory form where possible.

–
'95 XJS convertible - V12 6.0L
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !