MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-568
STEP 4. Adjust the basic idle speed.
Refer to, Basic Idle Speed Adjustment for the adjustment pro-
cedure
.
Standard value: 700
±
50 r/min
Q: Is the idle speed normal?
YES :
Refer to, Clean the throttle valve area
NO :
The check is completed.
INSPECTION PROCEDURE 11: When the engine is cold, it stalls at idle (die out).
.
COMMENT
•
In such cases as the above, the air/fuel mixture
may be inappropriate when the engine is cold.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the IAC system.
•
Malfunction of the throttle body.
•
Malfunction of the injector system.
•
Malfunction of the ignition system.
DIAGNOSIS
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)
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 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 3.
STEP 3. Checking by operating the accelerator pedal.
Q: Does the engine stall right after the accelerator pedal is
released?
YES :
Refer to, Clean the throttle valve area
NO :
Go to Step 4.
AKX01177
16 PIN
MB991502
AB
