1286 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
114
P0489
11
Circuit Short to Ground
EMS ECU detects this fault if the
following condition is true:-
Any of EGR actuator H bridge drive pins
of EMS ECU are short circuited to
ground.
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 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 short circuited to
ground. If so, then rectify the wiring harness connections.
4.
Remove the Actuator, Check the resistance across the
actuator positive and negative terminals, if the resistance is not
in design specified range (3 ohms) 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
115
P0489
19
Circuit Current Above
Threshold
EMS ECU detects EGR current
limitation fault if following condition is
true:-
Current taken by EGR unit is either
higher or lower than specified
calibratable limits
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~9. -.
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 (3 ohms) 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