Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 293
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-371
STEP 4. Check the idle air control motor coil resistance.
(1) Disconnect the idle air control motor connector B-34.
(2) Measure the resistance between idle air control motor
connector terminal 2 and either terminal 1 or terminal 3.
Standard value: 28
−
33 ohm [at 20
°
C (68
°
F)]
(3) Measure the resistance between idle air control motor
connector terminal 5 and either terminal 4 or terminal 6.
Standard value: 28
−
33 ohm [at 20
°
C (68
°
F)]
Q: Is the resistance normal?
YES : Go to Step 5.
NO : Replace the idle air control motor. Then go to Step 14.
STEP 5. Check the power supply voltage at idle air control
motor harness side connector B-34.
(1) Disconnect the connector B-34 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2, 5 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 7.
NO : Go to Step 6.
ACX02523AI
IDLE AIR
CONTROL
MOTOR
CONNECTOR:B-34
AKX01561
1 2 3
4 5 6
1 2 3
4 5 6
AB
AKX01428
1
2
3
5 4
6
B-34 HARNESS
SIDE CONNECTOR
AF
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-372
STEP 6. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector A-
21X terminal 1 and idle air control motor connector B-
34 terminal 2, 5 because of open circuit or short circuit
to ground. Then go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 14.
STEP 7. Check the power supply voltage at ECM connector
C-51 <M/T> or PCM connector C-52 <A/T> by backprobing
(1) Do not disconnect the connector C-51 <M/T> or C-52 <A/
T>.
(2) Measure the voltage between terminal 14, 15, 28, 29 and
ground by backprobing.
•
The voltage is 1V or lower for approximately 3 seconds,
then changes to the battery positive voltage when the
Ignition switch is turned from the "LOCK" (OFF) position
to the "ON" position.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 10.
NO : Go to Step 8.
STEP 8. Check connector C-51 at ECM <M/T> or connector
C-52 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 14.
AK000226
AK000226AB
CONNECTOR : A-21X
MFI RELAY
AKX01550
1
2
3 4
5 6
7 8
10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25
26 27 28 29
30 31 32 33
34 35
C-51<M/T>, C-52<A/T>
CONNECTOR HARNESS
SIDE VIEW
AE
9
AK000225
CONNECTOR : C-51<M/T>, C-52<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AJ
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-373
STEP 9. Check for open circuit and short circuit to ground
between idle air control motor connector B-34 and ECM
connector C-51 <M/T> or PCM connector C-52 <A/T>.
a. Idle air control motor connector B-34 terminal 1 and ECM
connector C-51 terminal 14 <M/T> or PCM connector C-52
terminal 14 <A/T>.
b. Idle air control motor connector B-34 terminal 3 and ECM
connector C-51 terminal 28 <M/T> or PCM connector C-52
terminal 28 <A/T>.
c. Idle air control motor connector B-34 terminal 4 and ECM
connector C-51 terminal 15 <M/T> or PCM connector C-52
terminal 15 <A/T>.
d. Idle air control motor connector B-34 terminal 6 and ECM
connector C-51 terminal 29 <M/T> or PCM connector C-52
terminal 29 <A/T>.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
STEP 10. Check connector C-51 at ECM <M/T> or
connector C-52 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 14.
ACX02523AI
IDLE AIR
CONTROL
MOTOR
CONNECTOR:B-34
AK000225
CONNECTOR : C-51<M/T>, C-52<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AJ
AK000225
CONNECTOR : C-51<M/T>, C-52<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AJ
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-374
STEP 11. Check the idle air control motor operation using
special tool MB991709.
(1) Remove the idle air control motor.
(2) Connect special tool MB991709 to the idle air control motor.
(All terminals should be connected.)
(3) Use the jumper wires to connect terminal 2 of the idle air
control motor connector to the battery (+) terminal.
(4) Check the ensure that the motor operates when the
terminals 1 and 3 of the idle air control motor connector are
respectively connected to the battery (-) terminal using a
jumper wire.
•
Vibration should be present at each application of
voltage to test clip combination.
(5) Then. Use jumper wires to connect the terminal 5 of the idle
air control motor connector to the battery (+) terminal.
(6) Check the ensure that the motor operates when the
terminals 4 and 6 of the idle air control motor connector are
respectively connected to the battery (-) terminal using a
jumper wire.
•
Vibration should be present at each application of
voltage to test clip combination.
(7) Install the idle air control motor. Refer to, Throttle Body
−
Disassembly and Assembly (
).
Q: Is the idle air control motor operating properly?
YES : Go to Step 12.
NO : Replace the idle air control motor. Then go to Step 14.
ACX02523AI
IDLE AIR
CONTROL
MOTOR
CONNECTOR:B-34
AKX01626
AKX01627AB
TERMINAL 2
IAC MOTOR
TERMINAL 5
MB991709
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