1256 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
70
P0236
64
Signal Plausibility Failure
This DTC gets logged if the EMS ECU
finds the Boost pressure sensor input
signal value is not plausible/out of
calibrated range, at any engine
operating condition.
EMS ECU takes following
recovery actions:
1.
Disables the AMF sensor learning.
2.
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 proceding 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.
5.
Check Electrical continuity between ECU pins A68, A42, & A13
to Boost pressure sensor connector pins 1,3 & 4 as per circuit
schmatics; Follow Electrical continuity check procedure.
Replace/ Rectify Harness if required.
6.
Check whether the boost pressure sensor signal pin A13 is
short circuited to ground or battery. If so then rectify the wiring
harness connections according to circuit schematics.
7.
Check the resistance of the sensor, it should be according to
design specifications at various vehicle conditions(XX value at
XX vehicle condition). Replace the sensor if problem still
persists.
8.
Check ECU, if problem still persists replace the ECU.
9.
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