Mitsubishi Galant. Manual — part 297
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-413
STEP 15. 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 injector.
b. Check the harness wire between injector connector B-
21 terminal 2 and PCM connector C-39 terminal 9 when
checking No.2 cylinder injector.
c. Check the harness wire between injector connector B-
19 terminal 2 and PCM connector C-39 terminal 24
when checking No.3 cylinder injector.
d. Check the harness wire between injector connector B-
17 terminal 2 and PCM connector C-39 terminal 2 when
checking No.4 cylinder injector.
e. Check the harness wire between injector connector B-
25 terminal 2 and PCM connector C-39 terminal 10
when checking No.5 cylinder injector.
f. Check the harness wire between injector connector B-
30 terminal 2 and PCM connector C-39 terminal 25
when checking No.6 cylinder injector.
Q: Is the harness wire in good condition?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check if the injectors are clogged.
c. Check compression pressure.
d. Check fuel lines for clogging.
e. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it.Then confirm that the malfunction symptom
is eliminated.
INSPECTION PROCEDURE 7: Hard Starting
COMMENT
•
In cases such as the above, the cause is usually
either weak spark, improper air-fuel mixture or
low compression.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the ignition system.
•
Malfunction of the injector system.
•
Poor fuel quality. (Contamination)
•
Poor compression.
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
AK000618
AK000618 AE
CONNECTORS:B-17,B-19,B-21,B-22,B-25,B-30
B-25
B-19
B-22
B-30
B-17
B-21
AK000280
CONNECTOR : C-39
PCM
AW
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-414
STEP 1. Check the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
•
The voltage is 8 volts or more.
Q: Is the voltage normal?
YES : Go to Step 2.
NO : Refer to GROUP 54A, Battery-Battery check(
STEP 2. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC is output?
YES : Refer to Diagnostic Trouble Code Chart(
).
NO : Go to Step 3.
STEP 3. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to
Actuator Test Reference Table(
a. Item 07: Fuel Pump.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 4.
NO : Repair or Replace. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Using scan tool MB991502, check data list.
(1) Turn the ignition switch the "ON" position.
(2) Check the following items in the data list. Refer to Data List
Reference Table(
).
a. Item 21: Engine Coolant Temperature Sensor.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 5.
NO : Repair or Replace. Then confirm that the malfunction
symptom is eliminated.
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-415
STEP 5. Check the ignition timing.
(1) Check the ignition timing at cranking.
Standard value:5
°°°°
BTDC
±±±±
3
°°°°
Q: Is the ignition timing normal?
YES : Go to Step 6.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
STEP 6. Check the left bank injector.
(1) Disconnect the left bank injector connector B-17, B-21, B-
30.
(2) Measure the resistance between each injector side
connector terminals 1 and 2.
Standard value: 13
−−−−
16 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance standard value?
YES : Go to Step 7.
NO : Replace the faulty injector. Then confirm that the
malfunction symptom is eliminated.
AK000618 AD
CONNECTORS:B-17,B-21,B-30
B-30
B-17
B-21
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-416
STEP 7. Check the right bank injector resistance at injector
intermediate connector B-26.
(1) Disconnect the injector intermediate connector B-26.
(2) Measure the resistance between each male connector side
terminal.
a. Measure the resistance between terminal 1 and 2 when
measuring No.1 cylinder injector.
b. Measure the resistance between terminal 1 and 3 when
measuring No.3 cylinder injector.
c. Measure the resistance between terminal 1 and 4 when
measuring No.5 cylinder injector.
Resistance should be between 13 and 16 ohm [at 20
°
C
(68
°
F)].
Q: Is the resistance normal?
YES : Go to Step 10.
NO : Go to Step 8.
STEP 8. Check the right bank injector.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector, which
deviates from the standard value at Step 7.
(3) Measure the resistance between injector side connector
terminals 1 and 2.
Standard value: 13
−−−−
16 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance standard value?
YES : Go to Step 9.
NO : Replace the injector. Then confirm that the
malfunction symptom is eliminated.
AK000618
AB
CONNECTOR:B-26
AK000447
1 2
3 4
INJECTOR
INTERMEDIATE
CONNECTOR
AB
AK000618AC
CONNECTORS:B-19,B-22,B-25
B-25
B-19
B-22
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
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