1255 / 1575
STORME 400NM
SR
NO
DTC
FTB
DESCRIPTION
CAUSES
EFFECT ON VEHICLE
CHECK
POINTS
CORRECTIVE ACTION
MIL
STATUS
CEL
69
P0234
85
Signal above allowable
range
1. If the difference between the boost
pressure demand (VGT valve opening is
dependent on Boost pressure demand)
and the boost pressure raw value from
sensor is greater than maximum
threshold then this fault is logged. ~
ECU used to take following
recovery action if it found
turbocharger/supercharger
boost control "A" circuit issue:-
1.
Disable the AMF sensor learning.
2.
Disable the AMF plausibility test.
3.
Disable cruise control function.
4.
Disable EGR control and close
EGR valve.
5.
Apply reduce torque 3 mode:(70%
of torque cut off at 2700erpm).
6.
Disable SPC(Speed Pilot Control)
strategy, no more sPC trim
update.
7.
VGT position control disabled and
recovery position applied.
1.
Check 30A fuse connected to EMS power relay and battery
(+ve) power supply is not blown off . Replace if required.
2.
Check the continuity between the EMS ECU pin A68,A42 &
A13 and the boost pressure and temperature sensor
connector pins 1,3 & 4 . Rectify if any issues found. Check for
reference voltage 1 fault P0641, if so rectify that fault by
following its rectification procedure.
3.
Check whether the Boost pressure sensor signal pin A13 is
short circuited to battery supply due to wrong wiring harness
connections, if so then rectify the wiring harness connections
to make them inline with circuit schematics.
4.
Check Boost pressure sensor for oxidation, rust etc, if observed
clean deposit.
5.
Check harness for damages; Replace / Repair if harness is
damaged.
6.
Check whether VGT actuator is stuck open/mechanical damage
to VGT actuator.
7.
Check the continuity between the EMS ECU pin A89 to the
VGT actuator connector pin 4 && Main relay power suply to
Actuator connector pin 1 and rectify if any issues found.
8.
Check whether the VGT actuator connector pin 2 is connected
to ground and Connector pins 3 & 5 are connected to CAN H
and CAN L lines.
9.
Check whether the VGT actuator control pin A89 is either short
circuited to ground/battery. If so the rectify the wiring harness
connections to make them inline with circuit schematics.
10.
Check ECU pins and connector, Replace if found defective.
11.
if still problem persists then replace Boost pressure sensor
with new one.
12.
If problem still persists then replace VGT actuator with new
one.
13.
If problem still persists then replace EMS ECU.
ON
OFF