Mitsubishi 380. Manual — part 586
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-436
STEP 7. Using diagnostic tool , read the diagnostic trouble
code (DTC).
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.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P0638 set?
YES : Then go to Step 8.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
STEP 8. Using diagnostic tool , read the diagnostic trouble
code (DTC).
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P0638 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-437
DTC P1603: Battery Backup Line Malfunction
.
TECHNICAL DESCRIPTION
• The ENGINE-ECU checks the open circuit of bat-
tery backup line.
NOTE: When the system detects an open circuit in
the battery backup line, it makes 1 failure judgment
of other diagnostic trouble codes (DTCs).
.
DTC SET CONDITIONS
Check Conditions
• None
Judgement Criteria
• RAM area check failed
.
EOBD DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
• Open or shorted battery backup line, harness
damage or connector damage.
• ENGINE-ECU failed.
DIAGNOSIS
Required Special Tools:
• : Diagnostic tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB992044: Power Plant ENGINE-ECU Check Harness
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-438
STEP 1. Using diagnostic tool , read the diagnostic trouble
code (DTC).
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.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTC.
(4) Start the engine and run it at idle.
(5) Read the DTC.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1603 set?
YES : Go to Step 2.
NO : The inspection is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-439
STEP 2. Measure the backup power supply voltage at
ENGINE-ECU connector B-21 by using power plant
ENGINE-ECU check harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect
power plant ENGINE-ECU check harness special tool
MB992044 between the separated connectors.
(2) Measure the voltage between terminal No.16 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 3.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB182A
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
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