Mitsubishi Lancer Evolution IX. Manual — part 450
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-275
STEP 33. Replace the engine-ECU
• After engine-ECU is replaced, re-check for trou-
ble symptoms.
Q: Does trouble system persist?
YES :
Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO :
The check is end.
Inspection Procedure 9: The Engine Stalls when Starting the Car (Pass Out)
COMMENT ON TROUBLE SYMPTOM
• Engine stall on starting is possibly caused by mis-
fire due to failed spark plug, improper air-fuel
ratio at accelerator pedal depression or other
faults.
PROBABLE CAUSES
• Failed ignition system
• Failed intake system
• Failed emission gas cleaning system
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III diagnosis code
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Check EGR control solenoid valve itself.
• Check EGR control solenoid valve itself (Refer to
GROUP 17
− Emission Control System −
Exhaust Gas Recirculation (EGR) System
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the EGR control solenoid valve.
STEP 3. Check EGR valve itself.
• Check EGR valve itself (Refer to GROUP 17 −
Emission Control System
− Exhaust Gas Recir-
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the EGR valve.
STEP 4. Check air intake from intake hose and
intake manifold.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. Connector check: B-103 and B-114
ignition connectors
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
STEP 6. Check ignition coil spark.
Q: Is the check result normal?
YES :
Replace the engine-ECU.
NO :
Go to Step 7 .
STEP 7. Check spark plug.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Replace the spark plug.
AK305047
1
2
3
Connector : B-103, B-114
B-114(GR)
B-103(GR)
AB
Harness side
connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-276
STEP 8.Check spark plug cable itself.
• Check spark plug cable itself (Refer to GROUP
16
− Ignition System − On-vehicle Service
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Replace the spark plug cable.
STEP 9. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Replace the ignition coil.
STEP 10. Check harness between ignition coil
connector terminal No. 2 of each cylinder and
body earth.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES :
Check and repair harness between ignition
coil connector terminal No. 3 of each
cylinder and C-121 engine-ECU connector.
• Check signal line for open/short
circuit and damage.
NO :
Repair the damaged harness wire.
AK305047
1
2
3
Connector : B-103, B-114
B-114(GR)
B-103(GR)
AB
Harness side
connector
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-277
Inspection Procedure 10: The Engine Stalls when Decelerating
COMMENT ON TROUBLE SYMPTOM
• Engine stall on deceleration is possibly caused by
insufficient air intake, improper air-fuel ratio due
to failed exhaust gas recirculation system or
other faults.
PROBABLE CAUSES
• Failed idle speed system
• Failed ignition system
• Failed emission control system
• Throttle valve fouled
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III diagnosis code
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 14: Throttle position sensor
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check throttle position sensor system
(Refer to Code No. P0120
).
STEP 3. M.U.T.-II/III data list
• Item No. 45: Idle speed control servo position
OK: Idle speed control servo drops to 0
− 2
steps at deceleration (engine at 1,000 r/min
or higher).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check idle speed control servo system
(Refer to Code No. P0505
STEP 4. Check EGR control solenoid valve itself.
• Check EGR control solenoid valve itself (Refer to
GROUP 17
− Emission Control System −
Exhaust Gas Recirculation (EGR) System
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Replace the EGR control solenoid valve.
STEP 5. Check EGR valve itself.
• Check EGR valve itself (Refer to GROUP 17 −
Emission Control System
− Exhaust Gas Recir-
culation (EGR) System
).
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Replace the EGR valve.
STEP 6. Check throttle body (throttle valve
portion) for contamination.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Clean throttle body (throttle valve portion)
(Refer to
).
STEP 7. Connector check: B-103 and B-114
ignition coil connectors
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
STEP 8. Check ignition coil spark.
Q: Is the check result normal?
YES :
Replace the engine-ECU.
NO :
Go to Step 9 .
STEP 9. Check spark plug.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Replace the spark plug.
AK305047
1
2
3
Connector : B-103, B-114
B-114(GR)
B-103(GR)
AB
Harness side
connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-278
STEP 10. Check spark plug cable itself.
• Check spark plug cable itself (Refer to GROUP
16
− Ignition System − On-vehicle Service
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace the spark plug cable.
STEP 11. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Replace the ignition coil.
STEP 12. Check harness between ignition coil
connector terminal No. 2 of each cylinder and
body earth.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES :
Check and repair harness between ignition
coil connector terminal No. 3 of each
cylinder and C-121 engine-ECU connector.
• Check signal line for open/short
circuit and damage.
NO :
Repair the damaged harness wire.
AK305047
1
2
3
Connector : B-103, B-114
B-114(GR)
B-103(GR)
AB
Harness side
connector
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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