1164 / 1575
SAFARI STROME
SR
NO
DTC
DESCRIPTION RESOLVE
PRIORITY
EFFECT ON VEHCLE
CAUSES
CHECK POINTS
CORRECTIVE ACTION
CEL
MIL
STATUS
77
P0643
Sensor
Reference
Voltage “A”
Circuit High.
H
1. Reduced torque mode activated.
2. Engine may not start; if already running
then stops after few seconds.
3. Engine vibrates;
4. RVD is disabled.
5. EGR is disabled;
6. IMV operates without any trim correction
7. Injector balancing is disabled.
8. Prevents high pressure leak detection
9. Rail pressure demand is limited to 800
bar.
10. Disables Rail pressure build
measurement.
11. Disables Rail pressure control fault
detection.
12. This fault will cause many other faults
related to rail pr sensor; Acc pedal track 1;
AMF; T-Map etc. to get registered; As these
sensors are powered by supply voltage 1.
This DTC gets logged if the
sensor supply Voltage 1 is
more than the upper
threshold.
1. Check the connection of
sensors supplied by
Reference voltage1 and
Reference voltage2.
2. Check sensor connections
for rust dirt etc.
3. Check ECU.
1. Check the connection/continuity of sensors
powered by sensor supply Voltage 1(rail pressure,
accelerator pedal sensor 2, Air mass flow sensor,
EGR position feedback) Follow sensor supply
voltage1 check /rectification process. Check
whether ecu pins 75/76/77 are short circuited to
Battery. If so, then rectify the wiring harness
connections.
2. Check sensor connections for rust dirt etc.;
Follow rectification process of concerned sensor if
faulty.
3. Check ECU; Replace ECU; if problem still
persists.
4. Confirmatory check after rectification. Check with
diagnostic tool if the sensor supply voltage lies in
between 4.75 V to 5.35 V.
Y
N
78
P0646
A/C Clutch
Relay Control
Circuit Low.
M
1. A/C compressor remains continuously
ON.
This DTC gets logged if the
Air conditioning relay
control is short circuit to
ground.
1. Check the compressor
control relay connection.
2. Check electrical continuity.
3. Check ECU.
1. Check the compressor control relay connection;
Perform necessary repairs if connection is faulty.
2. Check electrical continuity between relay and
EMS ecu pin 48; Replace relay if problem persists.
Check whether the pin 48 is short circuited to
ground. If so then rectify the wiring harness
connections.
3. Check electrical continuity between ECU to Air
condition rely and ECU to A/C pressure trinary
switch as per circuit schematic; follow electrical
continuity check procedure; Replace/rectify harness
if required.
4. Check ECU; Replace ECU; if problem persists.
5. Confirmatory check after rectification. Perform
actuator test for AC clutch and check if it is working
fine.
N
N
79
P0647
A/C Clutch
Relay Control
Circuit High.
M
1. A/C does not function.
This DTC gets logged if the
Air conditioning relay
control is short circuit to
battery Positive.
1. Check the compressor
control relay connection.
2. Check electrical continuity.
3. Check ECU.
1. Check the compressor control relay connection;
Perform necessary repairs if connection is faulty.
2. Check electrical continuity between relay and
EMS ecu pin 48; Replace relay if problem persists.
Check whether the pin 48 is short circuited to
battery. If so then rectifies the wiring harness
connections.
3. Check electrical continuity between ECU to Air
condition rely and ECU to A/C pressure trinary
switch as per circuit schematic; follow electrical
continuity check procedure; Replace/rectify harness
if required.
4. Check ECU; Replace ECU; if problem persists.
5. Confirmatory check after rectification Perform
actuator test for AC clutch and check if it is working
fine.
N
N