Mitsubishi 380. Manual — part 545
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-272
DTC P0201: Injector Circuit Malfunction - Cylinder 1.
.
CIRCUIT OPERATION
• Refer to DTC P0300 - Random/Multiple Misfire-
and Misfire Cylinder 1-
.
• The injector power is supplied from the MPI relay
(terminal No. 4).
• The ECU controls the injector by turning the
power transistor in the ECU "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 ECU.
• A surge voltage is generated when the injectors
are switched on/off.
• The ECU monitors this surge voltage.
.
DTC SET CONDITIONS
Check Conditions
• Battery voltage is between 9.04 and 16.01vols.
• Engine speed is above 801 r/min.
Judgment Criteria
• IC internal test (open circuit, short to earth, short
to battery).
• MIL on after 2 drive cycles.
• Misfire present.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle
.
AK303096
CONNECTOR: B-01
AB
B-01 (GR)
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
AK303097
CONNECTOR: B-32
AB
B-32 (B)
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-273
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• No. 1 cylinder injector failed.
• Open or shorted to ground No.1cylinder injector
circuit.
• Shorted to battery, No.1cylinder injector circuit.
• Harness or connector damage.
• 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
• MB991658: Test Harness
• MB992044: Power Plant ECU Check Harness
STEP 1. Using diagnostic tool , check actuator test item
01: No. 1 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.
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the actuator testing mode for item 01,
No. 1 injector.
(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: Does the idle vary or engine run "rough"?
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- 32 at intermediate
connector 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 12.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-274
STEP 3. Check the No.1 cylinder injector resistance at
intermediate connector B-32.
(1) Disconnect the intermediate connector B-32.
(2) Measure the resistance between terminal No. 5 and No. 9.
• Resistance should be between 10.5 and 13.5 ohms.
Q: Is the measured resistance between 10.5 and 13.5
ohms?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check the harness connector B-01 at No. 1
cylinder injector for damage.
Remove the intake manifold.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
1 2 3
6 7 8
4 5
9 10
AK303098
B-32
INTERMEDIATE
CONNECTOR
AB
AK303099
M
1
2
CONNECTOR: B-01
AB
B-01 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-275
STEP 5. Check the No. 1 cylinder injector B-01.
(1) Disconnect the No. 1 cylinder injector connector B-01.
(2) Measure the resistance between injector side connector
terminal No. 1 and No. 2.
Standard value: 10.5
− 13.5 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 10.5 and 13.5 ohms
[at 20
°C (68°F)]?
YES : Repair harness wire between intermediate connector
B-32 (terminal No. 9) and injector connector B-01
(terminal No. 1) and harness wire between No.1
cylinder injector connector B-01 (terminal No. 2)
and intermediate connector B-32 (terminal No. 5)
because of open circuit or short circuit to ground
or harness damage.
Then go to Step 12.
NO : Replace the No.1 cylinder injector. Then go to Step
12.
AK303099
M
1
2
CONNECTOR: B-01
AB
B-01 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст