MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-575
INSPECTION PROCEDURE 13: The Engine Stalls when Accelerating (Pass Out).
.
COMMENT
•
In case such as the above, the cause is probably
misfiring due to a weak spark, or an inappropriate
air/fuel mixture when the accelerator pedal.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Vacuum leak.
•
Malfunction of the ignition system.
DIAGNOSIS
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)
STEP 1. 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 con-
necting 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 2.
STEP 2. 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 :
Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check for vacuum leaks.
•
Broken intake manifold gasket.
•
Broken or disconnected vacuum hose.
•
Improper operation of the PCV valve.
•
Broken air intake hose.
Then confirm that the malfunction symptom is
eliminated.
NO :
Repair or replace. Then confirm that the malfunction
symptom is eliminated.
AKX01177
16 PIN
MB991502
AB
AKX01177
16 PIN
MB991502
AB
