Mitsubishi Galant. Manual — part 247
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-213
CIRCUIT OPERATION
•
The injector power is supplied from the MFI relay
(terminal 1).
•
The PCM controls the injector by turning the
power transistor in the PCM "ON" and "OFF."
TECHNICAL DESCRIPTION
•
The amount of fuel injected by the injector is
controlled by the amount of continuity time the
coil is grounded by the PCM.
•
A surge voltage is generated when the injectors
are driven and the current flowing to the injector
coil is shut off.
•
The PCM checks this surge voltage.
DTC SET CONDITIONS
Check Area
•
Engine speed is lower than 1,000 r/min.
•
Throttle position sensor output voltage is lower
than 1.16 volts.
Judgment Criteria
•
Injector coil surge voltage (battery positive
voltage + 2 volts) has not been detected for two
seconds.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Injector failed.
•
Open or shorted injector circuit, or loose
connector.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
MD998464: Test Harness
AK000618AC
CONNECTORS:B-19,B-22,B-25
B-25
B-19
B-22
AK000618
AB
CONNECTOR:B-26
AK000555AB
CONNECTOR : A-21X
MFI RELAY
AK000280
CONNECTOR : C-39
PCM
AW
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-214
STEP 1. Using scan tool MB991502, check actuator test
item 01, 03, 05: Injectors.
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) Start the engine and run at idle.
(3) Set scan tool MB991502 to the actuator testing mode for
item 01, 03, 05 Injectors.
(4) Warm up the engine to normal operating temperature: 80
°
C to 96
°
C(176
°
F to 205
°
F).
•
Does the idle state worsen when the injector is cut off.
(Does idling become unstable or does the engine stall)
(5) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the actuator operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points (
NO : Go to Step 2.
STEP 2. Check connector B-26 at injector intermediate
connector for damage.
Q: Is the 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.
AC003081 AB
16 PIN
MB991502
AK000618
AB
CONNECTOR:B-26
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-215
STEP 3. Check the 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.
b. Measure the resistance between terminal 1 and 3 when
measuring No.3 cylinder.
c. Measure the resistance between terminal 1 and 4 when
measuring No.5 cylinder.
•
Resistance should be between 13 and 16 ohm.
Q: Is the resistance normal?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check the connector at injector for damage.
(1) Remove the intake manifold.
a. Check the connector B-22 when checking No.1 cylinder.
b. Check the connector B-19 when checking No.3 cylinder.
c. Check the connector B-25 when checking No.5 cylinder.
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(
AK000618
AB
CONNECTOR:B-26
AK000240AB
INJECTOR
INTERMEDIATE
CONNECTOR
1 2
3 4
AK000618AC
CONNECTORS:B-19,B-22,B-25
B-25
B-19
B-22
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-216
STEP 5. Check the injector.
(1) Disconnect the injector connector B-22 <No.1 cylinder> or
B-19 <No.3 cylinder> or B-25 <No.5 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 : Repair harness wire between injector intermediate
connector and injector connector because of open
circuit or short circuit to ground or harness
damage.
a. Repair harness wire between injector
intermediate connector B-26 terminal 1 and
injector connector B-22 terminal 1 and harness
wire between injector connector B-22 terminal
2 and injector intermediate connector B-26
terminal 2 when checking No.1 cylinder.
b. Repair harness wire between injector
intermediate connector B-26 terminal 1 and
injector connector B-19 terminal 1 and harness
wire between injector connector B-19 terminal
2 and injector intermediate connector B-26
terminal 3 when checking No.3 cylinder.
c. Repair harness wire between injector
intermediate connector B-26 terminal 1 and
injector connector B-25 terminal 1 and harness
wire between injector connector B-25 terminal
2 and injector intermediate connector B-26
terminal 4 when checking No.5 cylinder.
Then go to Step 12.
NO : Replace the injector. Then go to Step 12.
STEP 6. Check the power supply voltage at injector
intermediate connector B-26.
(1) Disconnect the connector B-26 and measure at the female
connector side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
•
Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the voltage normal?
YES : Go to Step 8.
NO : Go to Step 7.
AK000618AC
CONNECTORS:B-19,B-22,B-25
B-25
B-19
B-22
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
AK000271AB
2 1
4 3
INJECTOR
NTERMEDATE
CONNECTOR
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