Mitsubishi Outlander GS45X. Manual — part 908
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-565
.
CIRCUIT OPERATION
• The EGR valve power is supplied from the MFI
relay (terminal No. 2).
• The ECM (terminals No. 31, No. 32, No. 47, No.
48) drives the stepper motor by sequentially turn-
ing "ON" the power transistors in the ECM and
providing ground to the EGR valve (terminal No.
1, No. 3, No. 4, No. 6).
.
TECHNICAL DESCRIPTION
The ECM checks whether a short circuit to the
ground or an open circuit exists or not by measuring
the EGR valve (stepper motor) drive circuit voltage
when the current is not flowing through the coils of
the EGR valve (stepper motor).
.
DESCRIPTIONS OF MONITOR METHODS
When the EGR valve (stepper motor) drive circuit
voltage is under the specified range, it is judged that
a malfunction exists.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• EGR stepper motor monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Manifold absolute pressure sensor
• Accelerator pedal position sensor
.
AK700432
AB
Exhaust gas
recirculation valve
B-12 (GR)
Connector: B-12
AK700401AB
ECM
B-10 (GR)
Connector: B-10
AK700399AB
MFI relay
A-33X
Connector: A-33X
AK900602
Connector: A-13
A-13
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-566
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Ignition switch is "ON" position.
• Battery positive voltage is at between 10 and
16.5 volts.
Judgement Criterion
• When the EGR valve is de-energized, the ECM
voltage should be 1.5 volts or less for 1.4 sec-
onds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 3
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• EGR valve (stepper motor) failed.
• Harness damage.
• Connector damage.
• ECM failed.
End
Malfunction
Good
No
No
No
No
No
Stepper motor activation
command ON?
AK900363
Start
Yes
Yes
Yes
Yes
Yes
Continuous
failure for 1.4secs
Monitoring
conditions
Circuit voltage
>
6.7V
Circuit voltage
< 1.5V
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-567
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 Set
STEP 1. Check harness connector B-12 at EGR valve and
harness connector B-10 at ECM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 6.
STEP 2. Measure the EGR valve motor coil resistance.
(1) Disconnect the EGR valve connector B-12.
(2) Measure the resistance between EGR valve connector
terminal No. 2 and either terminal No. 1 or terminal No. 3.
Standard value: 20
− 24 Ω [at 20°C (68°F)]
(3) Measure the resistance between EGR valve connector
terminal No. 5 and either terminal No. 4 or terminal No. 6.
Standard value: 20
− 24 Ω [at 20°C (68°F)]
Q: Is the measured resistance between 20 and 24 ohms [at
20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the EGR valve. Then go to Step 6.
1
2 3
3
4
5 6
1
2 3
4
5 6
AK700535
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-568
STEP 3. Measure the power supply voltage at EGR valve
motor harness side connector B-12.
(1) Disconnect the connector B-12 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2, No. 5 and
ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Repair harness wire between MFI relay connector
A-33X (terminal No. 2) and EGR valve connector
B-12 (terminal No. 2, No. 5) because of open circuit or
short circuit to ground. Then go to Step 6.
STEP 4. Check for open circuit and short circuit to ground
and harness damage between EGR valve connector B-12
and ECM connector B-10.
(1) Disconnect the connector B-12 and B-10 measure at the
harness side.
(2) Measure the resistance between connector B-12 and
connector B-10.
a. Connector B-12 (terminal No. 1) and connector B-10
(terminal No. 31).
b. Connector B-12 (terminal No. 3) and connector B-10
(terminal No. 32).
c. Connector B-12 (terminal No. 4) and connector B-10
(terminal No. 47).
d. Connector B-12 (terminal No. 6) and connector B-10
(terminal No. 48).
• Should be less than 2 ohms.
(3) Check for the continuity between connector B-12 and
ground.
a. Connector B-12 (terminal No. 1) and ground.
b. Connector B-12 (terminal No. 3) and ground.
c. Connector B-12 (terminal No. 4) and ground.
d. Connector B-12 (terminal No. 6) and ground.
• Not continuity.
Q: Is the harness wire in good condition?
YES : Then go to Step 5.
NO : Repair it. Then go to Step 6.
1
2
3
4
5
6
AK700536AB
B-12 harness connector:
component side
1
2
3
4
5
6
AK700537
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AB
B-12 harness
connector:
component side
B-10 harness connector:
component side
1
2
3
4
5
6
AK700538AB
B-12 harness
connector:
component side
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