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SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
3.
Check whether the Glow feedback pin A17 of EMS ECU is
short circuited to Battery. If so, then rectify the wiring harness
connections according to circuit schematics. Check ECU pins
and connector pins for damage/rust. In case of rust then clean
them and refit the connector.
4.
Check whether the Glow plug drive pin of EMS ECU A85 is
short circuited to Ground. If so, then rectify the wiring harness
connections according to circuit schematics.
5.
Check whether the resistance of glow plugs is according to
specifications, if not replace the glow plugs.
6.
Replace ECU if problem still persists.
94
P0401
21
Signal amplitude <
minimum
This DTC gets logged if the difference
between the EGR demand and the EGR
feedback is lower than a calibrated error
threshold.
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 either short
circuited to vbatt/ground/short circuited across. If so, then
rectify the wiring harness connections.
4.
Check the continuity between the EMS ECU pins A65, A16,
A20 and the motorized EGR actuator connector pins 3, 5 & 4.
Rectify if any issues found. Check for any reference voltage
supply 3 faults (P0697), if so then follow the rectification
procedure of those faults.
5.
Check whether the EMS ECU feedback sensor signal pin A16
is short circuited to battery supply/Ground due to wrong wiring
harness connections, if so then rectify the wiring harness
connections to make them inline with circuit schematics.
6.
Check sensor for oxidation, rust etc, if observed clean deposit.
7.
Check for rust/dirt accumulated on the sensor connector, if
found clean the connector and refit it.
8.
Check the air inlet circuit and air filter, if they are clogged then
clean them.
9.
If still problem persists then replace the EGR module.
10.
If still problem persists then replace the EMS ECU.
11.
Ensure whether the EGR demand and feedback parameters
are matching before handing the vehicle to customer.
ON
OFF