Mitsubishi Montero Sport (2004+). Manual — part 329
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-729
.
CIRCUIT OPERATION
• The malfunction indicator lamp (SERVICE
ENGINE SOON or Check Engine Lamp) power is
supplied from the ignition switch.
• The PCM controls the ground of the malfunction
indicator lamp (SERVICE ENGINE SOON or
Check Engine Lamp) by turning the power tran-
sistor in the PCM ON and OFF.
.
COMMENT
• In cases such as the above, the cause is proba-
bly that the PCM is detecting a problem in a sen-
sor or actuator, or that one of the malfunctions
listed at right has probably occurred.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Short-circuit between the malfunction indicator
lamp (SERVICE ENGINE SOON or Check
Engine Lamp) and PCM.
• Malfunction of the PCM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
AK200035AB
CONNECTOR: D-08
D-08
JUNCTION BLOCK
(REAR SIDE)
AK200036AC
CONNECTORS: D-06
JUNCTION BLOCK
(FRONT SIDE)
D-06
AK200040AB
CONNECTOR: D-15
D-15(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-730
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 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 DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step. 2.
STEP 2. Check for continuity at combination meter
harness side connector C-04.
(1) Disconnect the connector C-04 and measure at the harness
side.
(2) Check for the continuity between terminal No. 23 and
ground.
• Should be open loop.
Q: Does continuity exist?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Check harness connector C-16 at the intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector C-16 is
in good condition, repair a short circuit to ground
between combination meter connector C-04 (terminal
No. 23) and PCM connector C-89 (terminal No. 22).
Then confirm that the malfunction symptom is
eliminated.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK200041
22 21
23
24
25
26
27
28
29
30
31
32
AB
CONNECTOR: C-04
C-04
HARNESS CONNECTOR:
COMPONENT SIDE
AK200500
24
25
21
26
27
22
23
29
30
31
32
28
C-04 HARNESS CONNECTOR:
COMPONENT SIDE
AK200500AC
24
25
21
26
27
22
23
29
30
31
32
28
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-731
INSPECTION PROCEDURE 5: Cranks, Won't Start
.
Cranks, Won't Start Circuit
• Refer to, Ignition circuit
.
CIRCUIT OPERATION
• Refer to, Ignition circuit
.
COMMENT
• In cases such as the above, the cause is proba-
bly no spark, fuel delivery, or fuel quality prob-
lems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of the fuel pump system.
• Malfunction of the injector system.
• Malfunction of the PCM.
• Contaminated fuel.
• Malfunction of the immobilizer system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should remain greater than 8 volts while the
engine is cranked.
Q: Dose the voltage remain greater than 8 volts while the
engine is cranked?
YES : Go to Step 2.
NO : Check the battery. Refer to GROUP 54, Battery
−
Battery Check
. Then confirm that the
malfunction symptom is eliminated.
STEP 2. Check the timing belt for breaks.
Q: Is the timing belt good condition?
YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction
symptom is eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-732
STEP 3 Using scan tool MB991958, check data list.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the following items in the data List. Refer to Data List
Reference Table
a. Item 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.
c. Item 21: Engine Coolant Temperature Sensor.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 4.
NO : Repair or replace.Then confirm that the malfunction
symptom is eliminated.
STEP 4. Using scan tool MB991958, 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 5.
NO : Repair or replace.Then confirm that the malfunction
symptom is eliminated.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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