Mitsubishi Lancer Evolution IX. Manual — part 440
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-235
PROBLEM SYMPTOMS TABLE
A/C performance
Poor A/C Performance
The temperature of air cooling from
A/C is not efficient or very far from
the target temperature.
22
Items
Trouble symptom
Inspection
procedure
No.
Inspection
procedure
No.
Trouble symptom
Reference
page
1
Communication with all system is not possible
2
Communication with engine-ECU only is not possible
3
The engine warning lamp does not illuminate right after the ignition switch is
turned "ON" position
4
The engine warning lamp remains illuminating and never goes out
5
Starting impossible (No initial combustion)
6
Starting impossible (Starter operative but no initial combustion)
7
Starting impossible (Initial combustion but no complete combustion)
Starting impossible (Long time to start)
8
Unstable idling (Rough idling, hunting)
Improper idling speed (Too high or too low)
Engine stalls during idling (Die out)
9
The engine stalls when starting the car (pass out)
10
The engine stalls when decelerating
11
Engine does not revolve up
12
Hesitation, sag
Poor acceleration
Stumble
Surge
13
The feeling of impact or vibration when accelerating
14
The feeling of impact or vibration when decelerating
15
Knocking
16
Ignition timing offset
17
Run on (Dieseling)
18
Odor, white smoke, black smoke, high-concentration CO/HC during idling
19
Battery rundown
20
Overheating
21
Abnormal rotation of fan motor
22
Poor A/C performance
23
Engine-ECU power supply, engine control relay, ignition switch-IG1 system
24
Fuel pump system
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-236
25
Radiator fan control relay system
26
Condenser fan control relay system
27
A/C switch system
28
A/C compressor relay system
29
A/C load signal system
30
Ignition circuit system <L.H. drive vehicles>
31
Ignition circuit system <R.H. drive vehicles>
Inspection
procedure
No.
Trouble symptom
Reference
page
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-237
SYMPTOM PROCEDURES
Inspection Procedure 1: Communication with All System is not Possible
OPERATION
• Battery voltage is applied to diagnosis connector
(terminal No.16).
• Diagnosis connector (terminals No. 4 and 5) are
earthed to the vehicle body.
COMMENTS ON TROUBLE SYMPTOM
• Failure is possibly caused by failed power supply
circuit or failed earthing circuit of diagnosis con-
nector.
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AK305249
15
15A
Fusible link (1)
C-14
Diagnosis connector
1
C-211
C-214
W-R
W-R
B
B
12
16
4
5
J/B
Diagnosis connector circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple
AC
1
C-126
G-R (*1) or
W (*2)
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-238
PROBABLE CAUSES
• Failed diagnosis connector
• Open/short circuit in diagnosis connector circuit.
• Failed M.U.T.-II/III
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-14 diagnosis
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Perform resistance measurement at C-14
diagnosis connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 4 and earth,
also between terminal No. 5 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check and repair harness between C-14
(terminal No. 4) diagnosis connector and
body earth, also between C-14 (terminal No.
5) diagnosis connector and body earth.
• Check earthing line for open circuit
and damage.
STEP 3. Perform voltage measurement at C-14
diagnosis connector.
• Disconnect connector, and measure at the har-
ness side.
• Voltage between terminal No. 16 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check intermediate connectors C-126, C-211
and C-214, and repair if necessary. If
connectors are normal, check and repair
harness between C-14 (terminal No. 16)
diagnosis connector and battery.
• Check power supply line for
open/short circuit.
STEP 4. Replace M.U.T.-II/III.
• After replacing the M.U.T.-II/III, re-check the trou-
ble symptoms.
Q: Does trouble symptom persist?
YES :
Go to Step 5 .
NO :
The check is end.
AK203591
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AD
Connector: C-14
Harness side connector
C-14 (B)
AK203591
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AD
Connector: C-14
Harness side connector
C-14 (B)
AK203591
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AD
Connector: C-14
Harness side connector
C-14 (B)
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