Mitsubishi Lancer Evolution X. Manual — part 311
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-309
.
CIRCUIT OPERATION
• The injector power is supplied from the injector
relay (terminal No. 3).
• The ECM controls the injector by turning the
power transistor in the ECM "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is con-
trolled by the amount of continuity time the coil is
grounded by the ECM.
.
DESCRIPTIONS OF MONITOR METHODS
The ECM detects open circuit and short malfunction.
.
MONITOR EXECUTION
Continuous
.
AK704256
Connectors: A-25X, A-34X
MFI relay
Injector relay
A-34X
A-25X
AB
AK704255AB
Connector: A-39
A-39 (B)
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704264 AB
Connector: B-102
B-102 (GR)
Injector No. 2
AK704258 AB
Connector: C-50
C-50 (B)
AK704259AB
Connectors: C-304, C-317
ETACS-ECU
C-304
C-317
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-310
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITIONS <Circuit continuity − open circuit and shorted low>
Logic Flow Chart
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is 3 volts or less without the
injector driving for 2 seconds.
.
Good
Malfunction
Injector voltage < = 3V
Start
Continuous
failure for 2secs
End
No
No
Yes
Yes
Yes
No
AK700479
Monitoring
condition
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-311
DTC SET CONDITIONS <Circuit continuity − shorted high>
Logic Flow Chart
Check Condition
• Engine is running.
Judgement Criterion
• The coil current is 4.5 ampere or more with the
injector driving for 2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 23
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• No. 2 cylinder injector failed.
• Open or shorted No. 2 cylinder injector circuit,
harness damage or connector damage.
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
Good
Malfunction
Current >= 4.5A
End
Yes
No
No
No
AK604332
Start
Yes
Yes
Continuous
failure for 2secs
Monitoring
condition
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-312
STEP 1. Using scan tool MB991958, check actuator test
item 1: Injectors.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for
item 1, Injectors.
(4) Warm up the engine to normal operating temperature: 80° C
to 95° C (176° F to 203° F).
• The idle should become slightly rougher.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : 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
.
NO : Go to Step 2.
STEP 2. Check harness connector B-102 at No. 2 cylinder
injector for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 20.
STEP 3. Check the No. 2 cylinder injector.
(1) Disconnect the No. 2 cylinder injector connector B-102.
(2) Measure the resistance between injector side connector
terminal No. 1 and No. 2.
Standard value: 10.5 − 13.5 Ω [at 20° C (68° F)]
Q: Is the measured resistance between 10.5 and 13.5 Ω [at
20° C (68° F)]?
YES : Go to Step 4.
NO : Replace the No. 2 cylinder injector. Then go to Step
20.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AK604038
1 2
AB
Injector side
connector
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