Mitsubishi 380. Manual — part 543
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-264
13A
DTC P0171: System too Lean (bank 1)
.
CIRCUIT OPERATION
• Multiplicative or Additive adaption performed by
ENGINE-ECU.
.
TECHNICAL DESCRIPTION
• If a malfunction occurs in the fuel system, the fuel
trim value becomes too large.
• The ECU checks whether the fuel trim value is
within a specified range.
.
DTC SET CONDITIONS
Check Conditions
• Bank 1 too lean
Judgment Criteria
• MIL on after 2 drive cycles.
• No limp home.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Injector (Number 1, 3, 5) malfunctioning.
• Incorrect fuel pressure.
• Air drawn in from gaps in gasket, seals, etc.
• Use of incorrect or contaminated fuel.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check for intake system vacuum leak.
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 4.
NO : Go to Step 2.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-265
STEP 2. Using diagnostic tool , check actuator test items
01, 03, 05: Injector.
CAUTION
To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector. Refer to
Actuator Test Table
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the Actuator Test mode for MPI -
Items 01, 03, 05: Injector.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C.
(5) Perform Actuator test on each injector.
(6) Conduct a Power Balance test on each cylinder. Refer to
On-Vehicle Service - Injector Check
.
Q: Is each injector operating properly?
YES : YES: Go to Step 3.
NO : Refer to On-Vehicle Service - Injector Check
. If injector is malfuctioning replace and go
to Step 3.
STEP 3. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Go to Step 4.
NO : Repair it. Then go to Step 4.
STEP 4. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− EOBD Drive Cycle −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0171 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-266
DTC P0172: System too Rich (bank 1)
.
CIRCUIT OPERATION
• Multiplicative or Additive adaption performed by
ENGINE-ECU.
.
TECHNICAL DESCRIPTION
• If a malfunction occurs in the fuel system, the fuel
trim value becomes too small.
• The ECU checks whether the fuel trim value is
within a specified range.
.
DTC SET CONDITIONS
Check Conditions
• Bank 1 too rich.
Judgment Criteria
• MIL on after 2 drive cycles.
• No limp home.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Injector (Number 1, 3, 5) malfunctioning.
• Incorrect fuel pressure.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using diagnostic tool , check actuator test items
01, 03, 05: Injector.
CAUTION
To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector. Refer to
Actuator Test Table
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the Actuator Test mode for MPI -
Items 01, 03, 05: Injector.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C.
(5) Perform Actuator test on each injector.
(6) Conduct a Power Balance test on each cylinder. Refer to
On-Vehicle Service - Injector Check
.
Q: Is each injector operating properly?
YES : YES: Go to Step 2.
NO : Refer to On-Vehicle Service - Injector Check
. If injector is malfuctioning replace and go
to Step 3.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-267
STEP 2. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Go to Step 3.
NO : Repair it. Then go to Step 3.
STEP 3. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− EOBD Drive Cycle −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0172 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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