MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-9
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TROUBLESHOOTING STRATEGY
M1131150002188
NOTE: If a DTC is erased, its "freeze frame" data will
also be erased and system readiness test status will
be reset. Store the "freeze frame" data before eras-
ing the DTC.
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to have
exhausted most of the possible ways to find an MFI
fault.
1. Gather as much information as possible about the
complaint from the customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any MFI Diagnostic Trouble
Code (DTC).
4. If you cannot verify the condition and there are no
DTCs, the malfunction is intermittent. For
information on how to cope with intermittent
malfunctions, refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How
to Cope with Intermittent Malfunctions
P.00-15
.
5. If you can verify the condition but there are no
DTCs, or the system cannot communicate with
the scan tool, refer to the trouble symptom
classification table.
6. If there is a DTC, store the number of the code,
then erase the code from the memory using the
scan tool.
7. Reconfirm the malfunction symptom and carry out
a test drive with the drive cycle pattern.
8. If DTC is set again, carry out an inspection with
appropriate diagnostic trouble code procedures.
9. If DTC is not set again, the malfunction is
intermittent. For information on how to cope with
intermittent malfunctions, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points − How to Cope with Intermittent
Malfunctions
P.00-15
.
10.After repairs are completed, conduct a road test
duplicating the complaint set conditions to confirm
the malfunction has been corrected.
NOTE: If the engine control module (ECM) is
replaced, Immobilizer Encrypted Code Registration
should be carried out, refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
P.42B-11
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
P.42C-9
.
DIAGNOSTIC FUNCTION
M1131155503738
.
MALFUNCTION INDICATOR LAMP (SERVICE
ENGINE SOON OR CHECK ENGINE LAMP)
Among the on-board diagnostic items, Malfunction Indicator
Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illu-
minates to notify the driver of an emission control malfunction.
However, when an irregular signal returns to normal and the
engine control module judges that it has returned to normal, the
Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) will switch off.
There are two methods for checking the Malfunction Indicator
Lamp (SERVICE ENGINE SOON or Check Engine Lamp) burn
out: When the ignition switch is in ON position, the Malfunction
Indicator Lamp (SERVICE ENGINE SOON or Check Engine
Lamp) is illuminated, and then extinguished few seconds later.
When the ignition switch is in ON position and the engine
starts, the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) is extinguished.
NOTE: When the Transmission Control Module (TCM) detects
malfunctions related to the TC-SST, the Malfunction indicator
Lamp (SERVICE ENGINE SOON or Check Engine Lamp) is
also illuminated.
.
AK800001AB
Malfunction
indicator lamp
(SERVICE
ENGINE
SOON or check
engine lamp)