Mitsubishi L200. Manual - part 126
TROUBLESHOOTING
DIESEL FUEL
13A-300
• Failed supply pump
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE: This diagnosis code is outputted for an air
penetration in the fuel line of the supply pump due to
lack of fuel. Therefore, bleed air from the fuel line
after the fuel supply, and delete the diagnosis code
through M.U.T.-III.
STEP 1. M.U.T.-III diagnosis code
• With the air released from the fuel line, supply
fuel if necessary.
• Continue idle operation for about 5 minutes.
Q: Is the diagnosis code P1273 outputted again?
YES :
Go to Step 2 .
NO :
The check is end.
STEP 2. Replace the supply pump assembly.
• After the supply pump assembly, learn the sup-
ply pump (Refer to GROUP 00
− Precautions
Before Service
− What The Common Rail Engine
Learns ).
• After learning the supply pump assembly, re-
check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number
(Refer to GROUP 00
− Precautions Before
Service
− How to Perform Chassis Number
Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00
−
Precautions Before Service
− What The
Common Rail Engine Learns ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
NO :
The check is end.
Code No. P1274: Supply Pump Protection
OPERATION
• Refer to Code No. P0191: Rail Pressure Sensor
Range/Performance Problem
.
• Refer to Code No. P0192: Rail Pressure Sensor
Circuit Low Input
.
• Refer to Code No. P0193: Rail Pressure Sensor
Circuit High Input
.
FUNCTION
• The engine-ECU monitors the signals input from
the rail pressure sensor.
• Based on these input signals, the engine-ECU
checks whether the fuel pressure in the common
rail is abnormal.
TROUBLE JUDGMENT
Check Conditions
• Engine is running
• Rail pressure sensor is normal
Judgment Criterion
• For 1 seconds, the rail pressure stays in the criti-
cal pressure range in which the supply pump is
burned out.
PROBABLE CAUSES
• Failed supply pump
• Failed common rail assembly
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P1274 output?
YES :
Inspection chart for diagnosis codes (Refer
to
NO :
Go to Step 2 .
STEP 2. Check suction control valve itself
• Check suction control valve itself (Refer to
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the suction control valve. After
replacing the supply pump, learn the supply
pump (Refer to GROUP 00
− Precautions
Before Service
− What The Common Rail
Engine Learns ).