1285 / 1575
STORME 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
112
P0487
16
Circuit Voltage Below
Threshold
EMS ECU detects this fault if the
following condition is true:-
Under voltage fault on the actuator drive
is set~
EMS ECU takes following recovery
actions:~
1.
Disables the AMF sensor learning.
2.
Disables the AMF plausibility test.
3.
Disables cruise control function.
4.
Disables EGR control and close
EGR valve.
5.
Disables EGR valve supply =>
EGR valve probably closed.
6.
Applies Forced EGR closing by
applying negative PWM.
7.
Applies reduce torque mode :(
80% of torque).
8.
Disable SPC (Speed Pilot Control)
strategy, no more SPC trim
update.
1.
Check if the correct battery is fitted. Replace battery if wrong
battery is installed.
2.
Check & ensure main power hold rely is working properly and
its circuit connections are inline with Circuit schematics.
Check 30A fuse connected to main relay and ensure its
working properly. Replace if found faulty.
3.
Check and ensure whether the battery terminals are connected
properly and they are tight.
4.
Check the charging circuit; Rectify the charging circuit if faulty.
5.
Check ECU pin no B6,B2 & B4 are getting ground connection
and B1,B3 & B5 are connected to battery positive – 12 V
supply. Check the resistance between the vehicle chassis
ground and ECU ground. If the resistance is too high then fix
the ECU ground.
6.
Remove the Actuator, Check the resistance across the actuator
positive and negative terminals, if the resistance is not in
design specified range then replace EGR actuator.
7.
Replace EGR actuator if problem still persists.
8.
Check ECU; Replace ECU if problem still persists.
9.
Confirmatory check after rectification~ Check baterry voltage in
diagonistic tool. ~
A) Reading should be close to 12 V if alternator is not
charging. ~
B ) Reading should be close to 14 V if alternator is charging
ON
OFF
113
P0487
18
Circuit Current Below
Threshold
EMS ECU takes following recovery
actions:~
1.
Disable the AMF sensor learning.
2.
Disable the AMF plausibility test.
3.
Disable cruise control function.
4.
Disable EGR control and close
EGR valve.
5.
Disable EGR valve supply =>
EGR valve probably closed
forced EGR closing by applying
negative PWM.
6.
Apply reduce torque mode:(80% of
torque).
7.
Disable SPC (Speed Pilot Control)
strategy, no more SPC trim
update.
1.
Check the electrical continuity between the EMS ECU pins A83
and A84 to the EGR valve DC motor connector pins 2 & 1.
Rectify if any wiring harness connectivity issues are found.
2.
Check for rust/dirt on the connector and clean it if any rust/dirt
found.
3.
Check whether EMS ECU pins A83 & A84 are either short
circuited to vbatt /ground /short circuited across. If so, then
rectify the wiring harness connections to make them inline
with circuit schematics.
4.
Remove the Actuator, Check the resistance across the actuator
positive and negative terminals, if the resistance is not in
design specified range then replace EGR actuator.
5.
Check ECU pins for any damage.
6.
If problem still persists then change Motorized EGR valve.
7.
If problem still persists then replace ECU.
ON
OFF