1232 / 1575
SAFARI 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
38
P0115
64
Signal Plausibility Failure
1. EMS ECU performs coolant
temperature plausibility check if the
following conditions are met: ~ - there
is no coolant sensor fault~ - and the
engine has run during at least minimum
elapsed time in Running for plausibility
diagnosis~ - and the starting
temperature is below a limit value
(Maximum coolant temperature for
plausibility diagnosis versus inlet~ air
temperature)~ - and the engine is
warm. This is done using an integrator
depending on load and engine
speed.~~if the plausibility test result
shows that the coolant temperature is
not increasing / varying properly along
with engine running condition then this
fault will gets logged.
EMS ECU takes following recovery
actions:~
1.
Doesn't activated AC compressor
request even though AC request
input is activated by customer
and applies default ac torque.
2.
Disables the AMF sensor learning.
3.
Disables the AMF plausibility test.
4.
Disables DTI ISO leak test, DTI
ISO IMV test & DTI HPV ISO
test.
5.
Disables PWC strategy (Pilot main
waves compensation).
6.
Applies reduce torque mode:(80%
of torque).
7.
Disables SPC (Speed Pilot
Control) strategy, no more SPC
(Speed Pilot Control) trim
update.
1.
Check Sensor connector. if removed refit the connector.
2.
Check continuity between ECU pins A45 and A09 to coolant
temperature sensor connector pins 2 & 1 respectively and
rectify wiring harness if any short circuit to GND/Short circuit
to Vbatt/open circuit is found. Check ECU pins and connector
pins for damage/rust. In case of rust then clean them and refit
the connector.
3.
Clean the sensor connections and ensure proper fitment.
4.
Check Sensor Characteristics (measure voltage and resistance
at sensor terminals) Sensor voltage should be 5 V and
resistance as given in specifications (Sensor resistance: 1510
ohms at 35 degrees temperature); Replace sensor if found
faulty.
5.
Check ECU; Replace ECU; if problem still persists.
6.
After rectification if possible carry out following check~ Soak
the vehicle for more than 12 hrs (preferably overnight) ~
Then check if all the system temperature values (coolant, fuel,
inlet air) are close to each other.
ON
OFF
39
P0122
14
Circuit Short To Ground
or~Open
This fault gets logged if the Accelerator
pedal sensor 1 signal pin of EMS ECU is
short circuited to ground/open
1.
Applies reduce torque mode:(80%
of torque)
2.
EMS ECU disables dTI iso leak
test, DTI iso IMV test & DTI HPV
iso test.
3.
EMS ECU Increases idle target
speed.
4.
EMS ECU disable cruise control
function.~
1.
Check for Sensor reference voltage fault: P0641. If found then
rectify it by following its rectification procedure for solving this
fault
2.
Check Electrical continuity between ECU pins B25,B24 & B26
to Pedal connector pins 4,2 & 3; Replace/ Rectify if any
faults found.
3.
Check whether Accelerator pedal switch 1 signal pin B25 is
short circuited to ground, if so then rectify the wiring harness
connections to make them inline with circuit schematics.
4.
Replace accelerator pedal switch 1 if the problem still persists.
5.
Replace EMS ECU if the problem still persists.
6.
After rectification ensure the following checks before handing
over the vehicle to customer.
A) when pedal is not pressed - Pedal position in tata
diagnostic tool should be less than 5%.
B) when the pedal is fully pressed - Pedal position in tata
diagnostic tool should be more than 95 %.
OFF
ON