Mitsubishi Lancer Evolution X. Manual - part 237
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-13
NOTE: If the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates
because of a malfunction of the engine control module (ECM), communication between the scan tool
MB991958 (M.U.T.-III sub assembly) and the ECM is impossible. In this case, the diagnostic trouble code
cannot be read.
NOTE: After the ECM has detected a malfunction, the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) illuminates when the engine is next turned on and the same malfunction is
re-detected. However, for items marked with a "*1" in the diagnostic trouble code number column, the Mal-
function Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates only on the first
detection of the malfunction.
NOTE: The codes marked with a "*2" in the diagnostic trouble code number column have the following two
conditions for illuminating the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine
Lamp).
• In case that the misfire causing the damaged catalyst is detected, the Malfunction Indicator Lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) is illuminated at the time.
• In case that the misfire deteriorating the exhaust gas is detected, the Malfunction Indicator Lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) is illuminated when the same malfunction is redetected
after the next engine start.
NOTE: After the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates,
it will be switched off under the following conditions.
• When the ECM monitored the powertrain malfunction three times* and met set condition requirements, it
detected no malfunction. *: In this case, "one time" indicates from engine start to next engine start.
• For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant tempera-
ture, etc.) are similar to those when the malfunction was first recorded.
• The illuminated MIL for the vehicle identification number related faults is extinguished when the vehicle
identification number is detected.
NOTE: Sensor 1 of the heated oxygen sensor indicates the sensor mounted at a position closest to the
engine, and sensor 2 of the heated oxygen sensor indicates the sensor mounted at the position second clos-
est to the engine.
P2128*
1
Accelerator pedal position sensor (sub) circuit high input
P2135*
1
Throttle position sensor (main and sub) range/performance problem
P2138*
1
Accelerator pedal position sensor (main and sub) range/performance problem
P2195
Heated oxygen sensor (front) inactive
P2228*
1
Barometric pressure circuit low input
P2229*
1
Barometric pressure circuit high input
P2252
Heated oxygen sensor offset circuit low voltage
P2253
Heated oxygen sensor offset circuit high voltage
U0101*
1
TC-SST-ECU time-out <TC-SST>
U0121*
1
ASC-ECU time-out
U0141*
1
ETACS-ECU time-out
U1180*
1
Combination meter time-out
DTC
ITEM