1223 / 1575
STORME 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
24
P00BC
64
Signal plausibility failure
1.
This DTC gets logged if the Air mass
flow sensor input value is lower than
minimum Engine system
permissable threshold calibrated or
minimum OBD permissable
thresahold Calibrated.
2.
Engine system permissable
thresholds are calculated by ECU
using the parameters - Engine
speed, Boost pressure, atmospheric
pressure, Inlet air temperature.
1.
EMS ECU disables the AMF
sensor learning
2.
EMS ECU disables EGR control
and close EGR valve.
3.
EMS ECU applies reduce torque 1
mode:(60% of torque).
4.
EMS ECU disables the aMF
plausibility test~6. EMS ECU
disables cruise control function.
1.
Check 60A fuse connected to battery power supply is not blown
off and also check 10A fuse of ignittion power supply is not
blown off. Replace the fuse if found defective.
2.
Check the sensor connector for proper fitment; damage etc.,
ensure proper fitment of the connector with the sensor.
3.
Check sensor for oxidation rust, etc., if noticed clean the
deposits.
4.
Check for electrical continuity between ECU pins A58,A71 and
A04 to sensor connector pins 1,3 & 2. check continuity
between Ignition switch supply input to sensor connector pin 4
and rectify electrical discontinuity if noticed.Check ECU pins
and connector pins for damage/rust. In case of rust then clean
them and refit the connector.
5.
Check whether the AMF sensor signal pin A58 is Short circuited
to Battery or ground. If so, then rectify the wiring harness
connections.
6.
Replace AMF sensor in case of any physical damage to sensor
or if the problem still persists.
7.
Replace the EMS ECU if the problem still perists.
8.
After rectification ensure the following before handing over to
customer.
a) Check the Air mass flow sensor reading at ignition key on
shows xx mg/st.
b) Air mass flow reads < xx mg/st when the engine is at idle.
c) Air mass flow reads > xx mg/st when the engine is at fly-up.
ON
OFF