1260 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
7.
Applies reduce torque mode:(80%
of torque)
check whether it is according to the design specifications(xx to
xx ohms).
7.
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.
8.
Perform IMV buzzing test using I/O Control Command, if IMV is
not buzzing then replace IMV.
9.
Perform IMV buzzing test using I/O Control Command, if IMV is
not buzzing then replace IMV.
10.
Replace ECU if problem persists.
11.
After rectification perform actuator test for IMV and ensure the
result is positive.
75
P0253
11
Circuit Short to Ground
This DTC gets logged if the IMV drive
pin of EMS ECU is short circuited to
ground
EMS ECU takes following recovery
actions:~
1.
Disables cruise control function.
2.
Activates delayed engine stop
request.
3.
Disables RVD on injector cylinder1
4.
Disables RVD on injector cylinder2
5.
Disables RVD on injector cylinder3
6.
Disables RVD on injector cylinder4
7.
Disables IMV resistance
estimation.
8.
Freezes (will not activates) IMV
current trim fault.
9.
Increases idle target speed.
10.
IMV gets fully open.
11.
Disables PWC strategy (Pilot
main waves compensation).
12.
Apply reduce torque 2
mode:(70% of torque cut off at
2700erpm).
13.
Disable the rail pressure control
fault detection.
14.
Disable SPC (Speed Pilot
Control) strategy, no more SPC
trim update.
15.
Disable diagnostic of Rail
pressure control build fault.
1.
Check 30A fuse connected to EMS power relay and battery
(+ve) power supply is not blown off. Replace if required.
2.
Ensure IMV connector is properly connected to the IMV.
3.
There is no mud, dirt, foreign particle accumulation on the
connector.
4.
Check electrical continuity of wiring harness between ECU pin
A77 and IMV connector pin 2& EMS ECU 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.
5.
Check whether the IMV control pin of EMS A77 is short
circuited to ground because of wrong wiring harness
connections. If so rectify the wrong connections to make the
connections inline with circuit schematics.
6.
Check wiring harness resistance between IMV and ECU and
check whether it is according to the specifications.
7.
Check IMV internal resistance whether it is according to the
specifications.
8.
Replace ECU if problem persists.
9.
After rectification perform actuator test for IMV and ensure the
result is positive.
ON
OFF