1998 JAGUAR X308 VVT

            303‐01:  En gine  
                 Diagnos
is
 and  Testing  
                     Engine 
                     DTC P1392  VVT  solenoid  A circuit  low  input  
                     DTC P1397  VVT  solenoid  B circuit  low  input  
                     DTC P1393  VVT  solenoid  A circuit  high  input  
                     DTC P1398  VVT  solenoid  B circuit  high  input  
                     DTC P1396  VVT  solenoid  B malfunction  
                     Pinpoint test  A: P13
92 (P1397)  VVT  solenoid  circuit low  input  
                     Pinpoint test  B: P1393  (P1398)  VVT  solenoid  circuit high  input  
                     Pinpoint test  C: P1396  VVT  solenoid  malfunction  
                 In
‐Vehicle  Repair  
                     Connecting 
Rod Bearings  (12.17.16)  
                     Crankshaft 
Front Seal  Vehicles  Without:  Supe
rcharger  (12.21.14)  
                     Crankshaft 
Front Seal  Vehicles  With:  Supercharger  (12.21.14)  
                     Crankshaft 
Inner Sprocket  4.0L, Vehicles  Without:  Supercharger  (12.65.76) 
                     Crankshaft 
Inner Sprocket  3.2L (12.65.76)  
                     Crankshaft 
Outer Sprocket  (12.65.75)  
                     Crankshaft 
Pulley Vehicles  Without:  Supercharger  (12.21.09)  
                     Crankshaft 
Pulley Vehicles  With:  Supercharger  (12.21.09) 
                     Crankshaft 
Rear Seal  Vehicles  Without:  Supercharger  (12.21.20) 
                     Crankshaft 
Rear Seal  Vehic
les With:  Supercharger  (12.21.20)  
                     Cylinder 
Head LH  (12.29.02)  
                     Cylinder 
Head RH  (12.29.03)  
                     Engine
 Front  Cover  (12.65.01)  
                     Engine
 Front  Cover  Gasket  (12.65.04)  
                     Exhaust
 Camshaft  LH  (12.13.17)  
                     Exhaust
 Camshaft  RH  (12.13.15)  
                     Exhaust
 Camshaft  Sprocket  LH  4.0L,  Vehicles  Without:  Supercharger  (12.65.74) 
                     Exhaust
 Camshaft  Sprocket  LH  3.2L/4.0L,  Vehicles  With: Supercharger  (12.65.74)  
                     Exhaust
 Camshaft  Sprocket  RH  4.0L,  Ve
hicles  Without:  Supercharger  (12.65.73)  
                     Exhaust
 Camshaft  Sprocket  RH  3.2L/4.0L,  Vehicles With:  Supercharger  (12.65.73)  
                     Exhaust
 Manifold  LH  (30.15.55)  
Exhaust Manifold  RH  (30.15.56)  
Exhaust  Manifold  LH  and  RH  (30.15.57)  
Exhaust  Manifold  Gasket  LH  (30.15.58)  
Exhaust  Manifold  Gasket  RH  (30.15.59)  
Exhaust  Manifold  Gasket  LH  and  RH  (30.15.60)  

Tacho
meter
TACHA
ci
rcuit that provides input for
an electronic tachometer display
Thermal Vacuu
m Valve
TVVControls vacuum l
e
vels or
routing based on temperature
Throttle
Body
TBDe
vi
ce containing the throttle
Throttl
e
Position
TP
Throttl
e
Position Sensor
TPSInterprets throttl
e

position and movement to iden tify idle, acceleration and
full-power demands
Top Dead CenterTDC
Torque Converter C
lutch
TCC
To
tal
indicator reading
TIRThe t
o
tal indicated movement on a DTI with the test piece rotated through
360°
Transm
ission Control
Module
TCMControls
the shifting pattern
of the (automatic) transmission
Transm
ission Control
Switch
TCSModifi es
the operation of electronically controlled transmissions
Transmission Oil
TemperatureTOTIndi
cat
es temperature of transmission fluid
Transmission RangeTRThe ran
g
e in which the transmission is operating
Transmission Spe
e
d
Sensor
TSSIndi cat
es rotational speed of transmission output shaft or turbine shaft
V
Vacuu
m
Solenoid Valve
VSVVacuu
m
operated valve used in the speed control system
Vacuu
m
Solenoid Valve
(atm)
VSV VAVacuu m
atmospheric valve used in the speed control system
Vacuu
m
Solenoid Valve
(rel)
VSV VRVacuu m
release valve used in the speed control system
Vacuu
m
Solenoid Valve
(vac)
VSV VVVacuu m
valve used in the speed control system
Variable Valve TimingVVTA
s
ystem by which the relationship of the crankshaft and camshaft may be
altered during engine running
Vehi cl
e Battery Adapter
VBAProvide
s
electrical power to the PDU
and supplies a battery reference level
Vehicl
e Condition Monitor
VCMInst
rum
ent panel display which warns of faults
Ve
hic
le Emission Control
Information Label
VECI Label
Vehi cl
e Identification
Number
VINN u
mber assigned to the vehicle by the manufacturer, primarily for licensing
and identification purposes
Vehi cl
e Interface Adapter
VIAExtends the
PDU ca
pability and provid
es a parallel interface to vehicle
harnesses and ECMs
Vehicle Spe e
d Sensor
VSSSens
or which provides ve
hicle speed information
Viscosity In
dexVI
Voltage RegulatorVRDe
vice which regulates the variable output voltage of a generator
W
Wat
tWSI unit of power (1 hp = 7
45.7 watts)
W
i
de Open Throttle
WO
TFu
ll throttle position

Engine System - General Infor
mation - Engine
Description an
d Operation

The AJ26 power unit is available in 3.2 L and 4.0 L versions, and comprises:
An eight cylinder 9
0 degree 'V' config
uration liquid cooled aluminium cylinder block incorporating 'Nikasil' plated
cylinder bores.
Pi
stons of open-ended skirt design, with
two compression and one oil control ring.
Two al
uminium cylinder heads, each
incorporating two camshafts.
F
our valves per cylinder.
Al

uminium valve lifters and top mounted shims.
Vari

able valve timing (VVT) of the inlet camshafts (4.0 L normally aspirated only).
Camshaft

covers manufactured from Vinylester.
Al

uminium timing cover which accommodat
es the crankshaft front oil seal.
Sin
gle row primary and secondary chains dr
ive the camshafts of each cylinder bank.
An alu
minium bed pl
ate, incorporating iron main bearing supports, which accomm odate the oil pump pick-up,

En
gine - Engine
D
iagnosis and Testing
Sym

ptom Chart
Sy
mptom Chart
Pinp

oint test A: P1392 (P1397)
VVT solenoid circuit low input
S
pecial Tool(s)

D

igital multimeter

Generi

c scan tool
Sy

mptom
Possib
le Sources
Acti
on
D

TC P1392 VVT solenoid A circuit low input
So
lenoid coil open circuit
Harness open circuit or blown fuse
Connector pins(s) bent , loose or corroded
*
*
*
GO to
P
inpoint Test A

*
D
TC P1397 VVT solenoid B circuit low input
So
lenoid coil open circuit
Harness open circuit or blown fuse
Connector pins(s) bent , loose or corroded
*
*
*
GO to
P
inpoint Test A

*
D
TC P1393 VVT solenoid A circuit high input
So
lenoid coil short circuit
Harness short circuit
Connector pins(s) bent , loose or corroded
*
*
*
GO to
P
inpoint Test B

*
D
TC P1398 VVT solenoid B circuit high input
So
lenoid coil short circuit
Harness short circuit
Connector pins(s) bent , loose or corroded
*
*
*
GO to
P
inpoint Test B

*
D
TC P1396 VVT solenoid B malfunction
O
il pressure failure
VVT solenoid sticking
Connector pins(s) bent , loose or corroded
Crankshaft position sensor failure
ECM failure
*
*
*
*
*
GO to
P
inpoint Test C

*
P
INPOINT TEST A : P1392 (P1397) VVT SOLENOID CIRCUIT LOW INPUT
•
NOTE: References in brac
kets are for Bank B (2)
T
EST CONDITIONS
D
ETAILS/RESULTS/ACTIONS
A1

: RETRIEVE DTCS
•

NOTE: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.

Connect
the scan tool
1
Have the DTC(s) and fr
eeze f
rame data been recorded?
Yes GO to A2
A2: CH
ECK FUSE / RELAY
Check that fuse F
12 i
s good
and that EMS control relay is
energized
1
OK ?

Yes GO to A3
No Rectify as required
A3: CH
ECK VVT COIL RESISTANCE

W
ith VVT connector PI031 - A bank or (PI032 - B bank)
disconnected, measure the resistance between the pins 1
and 2 at the VVT actuator
1
I
s the resistance less than 5
OHM or greater than 20 OHM?
Yes Renew the VVT solenoid and te st the system for normal
operation.
No GO to A4
A4: CHECK
HARNESS CONTINUITY

Pin
point test B: P1393 (P1398) VVT solenoid circuit high input
W
ith EM014 disconnected, measure the resistance
between EM014/009 and ground EM016L
1
I
s the resistance < 0.5 OHM?
Yes Reconnect EM014, EM015, PI031 or (PI032)
GO to A6
No Inspect harness / connector EM014, ground stud and
splice EMS37 for corrosion, damage, bent or pushed back
pins and repair as required. Test the system for normal
operation.
A6
: END
Perform

appropriate service drive cycle and check for the
presence of DTC.
1
Has
the fault code cleared?
Yes STOP
No Contact Jaguar Service
P
INPOINT TEST B : P1393 (P1398) VVT SOLENOID CIRCUIT HIGH INPUT
•
NOTE: References in brac
kets are for Bank B (2)
T
EST CONDITIONS
D
ETAILS/RESULTS/ACTIONS
B1

: RETRIEVE DTCS
•

NOTE: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.

Connect
the scan tool
1
Have the DTC(s) and fr
eeze f
rame data been recorded?
Yes GO to B2
B2 : CH
ECK VVT COIL CONTINUITY
W
i
th VVT connector PI031 - A bank or (PI032 - B bank)
disconnected, measure the resistance between the pins 1
and 2 at the VVT actuator
1
I s
the resistance >20 OHM?
Yes Renew the VVT solenoid and te st the system for normal
operation.
No GO to B3
B3: CHECK
SHORT TO B+