MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-577
STEP 4. 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 10: EGR Solenoid.
(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.
STEP 5. Using scan tool MB991502, check data list item 45:
Idle Air Control Position.
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item
45, Idle Air Control Position.
a. The idle air control motor should drop to the 0
−
2 posi-
tion during deceleration (from 1,000 r/min or more).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operation properly?
YES :
Check the following items, and repair, replace or
clean the defective sections.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check the throttle valve area.
Then confirm that the malfunction symptom is
eliminated.
NO :
Refer to, DTC P0500
−
Vehicle Speed Sensor <M/T>
, or GROUP 23A, Automatic Transaxle
Diagnosis
−
Diagnostic Trouble Code Procedures
−
DTC 23 Output Shaft Speed System <A/T>
.
INSPECTION PROCEDURE 15: Hesitation, sag or stumble.
.
COMMENT
•
In cases such as the above, the ignition system,
air/fuel mixture or compression pressure may be
defective.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the ignition system.
•
Malfunction of air/fuel ratio control system.
•
Malfunction of the fuel supply system.
•
Malfunction of the EGR solenoid system.
•
Poor compression pressure.
DIAGNOSIS
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)
AKX01177
16 PIN
MB991502
AB
AKX01177
16 PIN
MB991502
AB
