MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-959
INSPECTION PROCEDURE 12: When the Engine Is Hot, It Stalls at Idle (Die Out).
.
COMMENT
• In cases such as the above, the ignition system,
air/fuel mixture, idle air control motor or compres-
sion pressure may be faulty. In addition, if the
engine suddenly stalls, the cause may also be a
loose connector.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of air/fuel ratio control system.
• Malfunction of the IAC system.
• Vacuum leak.
• Improper connector contact.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?
YES : Start the engine and let it run at idle for approximate
10 minutes after engine warm up. Then, if a
malfunction occurs, go to step 2.
NO : Go to Step 2.
STEP 2. 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
P.13B-23
.
NO : Go to Step 3.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824