1227 / 1575
STORME 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
30
P0103
15
Circuit short to battery or
open
ECU detects mass or volume air flow
circuit high if the following condition
arises
Airflow volume in the inlet manifold is
above the upper threshold because of
the air mass flow sensor signal pin is
open circuit/Short circuit to battery.~~
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.
5.
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 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. 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