1261 / 1575
STORME 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
76
P0254
12
Circuit Short to Battery
1. This DTC gets logged if the IMV drive
pin of EMS ECU is short circuited to
battery
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).
11.
Apply reduce torque 2
mode:(70% of torque cut off at
2700erpm)
12.
Disable the rail pressure control
fault detection.
13.
Disable 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.
Ensure IMV connector is properly connected to the IMV.
3.
There is no mud, dirt, foregn 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 battery 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