1316 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
198
P259E
84
Signal below allowable
range.
Manifold absolute pressure -
turbocharger/supercharger boost sensor
correlation fault gets logged when :~-
The measured pressure is less than a
lower limit of the calculated boost
pressure value
EMS ECU takes following recovery
actions:~
1.
Disables the AMF sensor learning.
2.
Disables the AMF plausibility test.
3.
Disables EGR control and close
EGR valve.
4.
Applies reduce torque 1
mode:(60% of torque).
5.
Disable SPC (Speed Pilot Control)
strategy, no more SPC (Speed
Pilot Control) trim update.
6.
VGT control disabled => Open
loop control.
1.
Check for Reference voltage fault P0651. If present; Follow
Reference voltage check and rectification Procedure, to
correct this fault before proceeding further.
2.
Check inlet air circuit for clogging; wrong assembly/fitment etc;
Ensure proper fitment of the inlet air circuit.
3.
Check sensor connections for rust dirt etc; clean the sensor
connections and ensure proper fitment.
4.
Visually check sensor; Replace sensor if damaged. Check
Electrical continuity between ECU pins A68, A42, & A13 to
Boost pressure sensor connector pins 1,3 & 4 as per circuit
schematics; Follow Electrical continuity check procedure.
Replace/ Rectify Harness if required.
5.
Check whether the atmospheric pressure value is consistent
and correct by monitoring the parameter visible in Diagnostic
tool.
6.
Check for any leakage before VGT ; Check the air filter;
7.
Check ECU, if problem still persists replace the ECU.
8.
After rectification ensure the following before handing over to
customer.
a) Boost pressure value reads by the ECU is = Atmospheric
pressure at ignition key is on.~
b) Boost pressure value reads by the ECU is < Atmospheric
pressure when the engine is at idle.~
c) Boost pressure value reads by the ECU is > Atmospheric
pressure when the engine is at fly-up.
ON
OFF