1218 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
d) Please drive the vehicle on road, check and ensure rail
pressure feed-back follows the demand continuously.(feedback
and demand parameters can be monitored by using diagnostic
tool).
17
P0091
84
Signal Below Allowable
Range
This fault gets logged If the difference
between the rail pressure demand and
the rail pressure feedback is less than a
calibrated minimum threshold for rail
pressure in Rail discharge mode.
EMS ECU takes following recovery
actions:
1.
Disable cylinder balance
correction, diagnostics and tooth
learning strategy.
2.
Applies reduce torque 1
mode:(60% of torque).
3.
Disables SPC (Speed Pilot
Control) strategy, no more SPC
trim update.
1.
Check 30A fuse connected to EMS power relay and battery
(+ve) power supply is not blown off. Replace if required.
2.
Check electrical continuity between ECU pin no A38, A35 &
A19 to Rail pressure sensor connector no 3, 1, 2. Check
whether the rail pressure sensor signal pin A35 is either
shorted to battery/ground. If so then rectify the wiring harness
connections to make them inline with circuit schematics.
3.
Check electrical continuity of wiring harness between ECU pin
A77 and IMV connector pin 2 & EMS main relay supply and
IMV connector pin 1. Rectify wiring harness connections in
case of any issue. Check 30A fuse connected to EMS power
relay and ensure its not short or malfunctioning. Replace if
required.
4.
Check whether the IMV control pin of EMS A77 is short
circuited to ground/battery because of wrong wiring harness
connections. If so rectify the wrong connections to make the
connections inline with circuit schematics.
5.
Check IMV internal resistance whether it is according to the
design specifications (5.3 ohms at 20 degrees C). Replace IMV
if the resistance is not according to specifications.
6.
Check whether adequate fuel level is available in the tank.
7.
Check high pressure fuel lines for leakage.
8.
Check fuel filter is not clogged.
9.
Check low pressure fuel lines for air entry.
10.
Check & ensure IMV and rail pressure sensor connectors for
proper fitment.
11.
Check rail pressure sensor for oxidation, rust etc, if observed
clean deposit.
12.
Check harness for damages; Replace / Repair if harness is
damaged.
13.
Check ECU pins and connector, Replace if found defective.
14.
If vehicle is unable to start the perform 'Static injector back leak
test', Please check if any injector back leak is abnormally high
compared to other injectors, then replace corresponding
injectors.
15.
If vehicle is able to start then start the vehicle and perform
'Dynamic IMV test' - If test result shows IMV is faulty then
replace IMV.
16.
If vehicle is able to start then start the vehicle and perform
'Dynamic injector back leak test', Please check if any injector
back leak is abnormally high compared to other injectors, then
replace corresponding injectors.
17.
If vehicle is able to start then start the vehicle and perform
"Pump pressure build capacity test' - If test result shows not ok
then replace HP pump.
18.
Check whether High pressure pump is functioning properly/able
to build pressure else replace high pressure pump.
19.
Check whether IMV is Stuck closed, if so replace the IMV.
20.
After rectification ensure the following before handing over to
OFF
ON