Mitsubishi Galant. Manual — part 121
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-165
STEP 9. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 13.
STEP 10. Check for harness damage between injector
connector and PCM connector.
a. Check the harness wire between injector connector B-22
terminal 2 and PCM connector C-39 terminal 1 when
checking No.1 cylinder.
b. Check the harness wire between injector connector B-21
terminal 2 and PCM connector C-39 terminal 9 when
checking No.2 cylinder.
c. Check the harness wire between injector connector B-19
terminal 2 and PCM connector C-39 terminal 24 when
checking No.3 cylinder.
d. Check the harness wire between injector connector B-17
terminal 2 and PCM connector C-39 terminal 2 when
checking No.4 cylinder.
Q: Is the harness wire in good condition?
YES : Go to Step 11.
NO : Repair it. Then go to Step 13.
STEP 11. Check the following items.
(1) Check the following items, and repair or replace the
defective component.
a. Check for skipped timing belt teeth.
b. Check compression.
c. EGR valve failed.
Q: Are there any abnormalities?
YES : Go to Step 12.
NO : Repair or replace it. Then go to Step 13.
AK000280
CONNECTOR : C-39
PCM
AW
AK000557 AB
B-21
B-19
B-17
B-22
CONNECTORS:B-17,B-19,B-21,B-22
AK000280
CONNECTOR : C-39
PCM
AW
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-166
STEP 12. Replace the injector.
(1) Replace the injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor(
(3) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0300 is output?
YES : Replace the PCM. Then go to Step 13.
NO : The inspection is complete.
STEP 13. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor(
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0300 is output?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0301: Cylinder 1 Misfire Detected, DTC P0302: Cylinder 2 Misfire Detected, DTC P0303: Cylinder
3 Misfire Detected, DTC P0304: Cylinder 4 Misfire Detected
Misfire Detected Circuit
•
Refer to, P0201_P0204 Injector Circuit (
CIRCUIT OPERATION
•
Refer to, P0201_P0204 Injector Circuit (
TECHNICAL DESCRIPTION
•
If a misfire occurs while the engine is running, the
engine speed changes for an instant.
•
The PCM checks for such changes in engine
speed.
DTC SET CONDITIONS
Check Conditions
•
Engine speed is between 500 and 6,000 r/min.
•
Engine coolant temperature is higher than -10
°
C
(14
°
F).
•
Intake air temperature is higher than -10
°
C (14
°
F).
•
Barometric pressure is at between 76kPa (11psi)
and 106kPa (15psi).
•
Adaptive learning is complete for the vane which
generates a crankshaft position signal.
•
While the engine is running, excluding gear
shifting, deceleration, sudden acceleration/
deceleration and A/C compressor switching.
•
Vehicle speed is 2.5km/h (1.6mph) or more.
•
The throttle deviation is -0.059V/10ms to
+0.059V/10ms.
Judgement Criteria (change in the angular
acceleration of the crankshaft is used for
misfire detection).
•
Misfire has occurred in 4 or more of the last 200
revolutions [when the catalyst temperature is
higher than 950
°
C (1,742
°
F)].
or
•
Misfire has occurred in 20 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard).
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Ignition system related part(s) failed.
•
Low compression pressure.
•
Injector failed.
•
PCM failed.
AK000557 AB
B-21
B-19
B-17
B-22
CONNECTORS:B-17,B-19,B-21,B-22
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-167
DIAGNOSIS
STEP 1. Check the spark plugs.
CAUTION
Do not attempt to adjust the gap of the platinum plug.
Cleaning of the platinum plug may result in damage to the
platinum tips. Therefore, if carbon deposits must be
removed, use a plug cleaner and complete cleaning within
20 seconds to protect the electrode. Do not use a wire
brush.
(1) For the right bank cylinder, remove the intake manifold.
(2) Check the plug gap and replace if the limit is exceeded.
Standard value: 1.0
−−−−
1.1 mm (0.039
−−−−
0.043 inch)
Limit: 1.3 mm (0.051 inch)
Q: Is the plug gap at the standard value?
YES : Go to Step 2.
NO : Replace the spark plug. Then go to Step 9.
STEP 2. Check the spark plug cable.
(1) Check the cap and coating for cracks.
(2) Measure the resistance.
Limit: maximum 22 k
Ω
Ω
Ω
Ω
Q: Is the resistance normal?
YES : Go to Step 3.
NO : Replace the spark plug cable. Then go to Step 9.
AKX00383
AKX00383
Platinum
tips
AB
AKX00382
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-168
STEP 3. Check the injector.
(1) Disconnect the injector connector B-22 <No.1 cylinder>, B-
21 <No.2 cylinder>, B-19 <No.3 cylinder>, B-17 <No.4
cylinder>.
(2) Measure the resistance between injector side connector
terminal 1 and 2.
Standard value: 13
−−−−
16 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance standard value?
YES : Go to Step 4.
NO : Replace the injector. Then go to Step 9.
STEP 4. Check connector at injector for damage.
a. Check the connector B-22 when checking No.1 cylinder.
b. Check the connector B-21 when checking No.2 cylinder.
c. Check the connector B-19 when checking No.3 cylinder.
d. Check the connector B-17 when checking No.4 cylinder.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace the injector. Refer to GROUP 00E,
Harness Connector Inspection(
). Then go to
Step 9.
STEP 5. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 9.
AK000557 AB
B-21
B-19
B-17
B-22
CONNECTORS:B-17,B-19,B-21,B-22
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
AK000557 AB
B-21
B-19
B-17
B-22
CONNECTORS:B-17,B-19,B-21,B-22
AK000280
CONNECTOR : C-39
PCM
AW
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