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Mitsubishi Galant. Manual - part 84

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-17

PROCEDURE 5

EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR

DTC

P0401

Drive cycle
pattern

This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed while
traveling with the following drive cycle pattern. It will take 10 minutes. You must complete this drive
twice.

NOTE: . Vehicle speed and throttle opening angle should be within the shaded range.

Inspection
conditions

•

Engine coolant temperature: 80

C (176

F) or more

•

Atmospheric temperature: 5

C (41

F) or more

•

A/C switch: OFF

•

Condition of A/T: Selector lever D range

Test procedure

Engine: start
Accelerate until the vehicle speed is 56

−

64 km/h (35

−

40 mph).

Travel for 20 seconds or more while keeping the vehicle speed at 56

−

64 km/h (35 - 40 mph).

Fully close the throttle from an engine speed of 2,000

−

3,000 r/min, and while keeping the clutch

engaged, decelerate to approx. 900 r/min without applying the brakes. Do not steer the handle or
turn the light ON/OFF during this time. (During monitor)

Accelerate until the vehicle speed reaches 56

−

64 km/h (35

−

40 mph), and travel for 20 seconds or

more . Then, repeat steps 4 and 5 and complete 8 monitor sessions.

Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
Confirm that the diagnostic trouble code (DTC) is not output.
If DTC P0401 is output, refer to DTC P0401

−

Exhaust Gas Recirculation Flow Insufficient

detected

P.13A-186

AKX01349

(2)

AKX01349

(3)

(5)

(2)

(1)

(4)

20 SECONDS OR MORE
56 - 64 km/h (35 - 40 mph)

20 SECONDS OR MORE

1 ST
MON-
ITOR

7 TH
MON-
ITOR

8 TH
MON-
ITOR

2 ND
MON-
ITOR

ENGINE START

IGNITION
SWITCH:"LOCK"
(OFF)

FULL
DECEL-
ERATION

64
(40)

32
(20)

100

VEHICLE
SPEED
km/h (mph)

<REFERENCE>
THROTTLE
OPENING
ANGLE (%)

AKX01349AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-18

PROCEDURE 6

OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit)

DTC

•

Main components: P0134, P0300, P0301, P0302, P0303, P0304, P0506, P0507,P1400

•

Sensors and switches: P0101,P0102,P0103, P0107, P0108,P0111, P0115,P0116,P0117,
P0121,P0122,P0123, P0335, P0340, P0551

•

Wire breakage and short circuit: P0130, P0135, P0136, P0141, P0201, P0202, P0203, P0204,
P0403, P0443, P0446, P1500

Drive cycle
pattern

NOTE: . Drive according to the graph below.

Inspection
conditions

•

Engine coolant temperature: 80

C (176

F) or more

•

Atmospheric temperature: 5

C (41

F) or more

•

Condition of A/T: Selector lever D range

Test procedure

Engine: start
Accelerate until the vehicle speed is 56

−

64 km/h (35

−

40 mph), and travel for 300 seconds or more.

Return the vehicle to the shop.
After stopping the vehicle, continue idling for 300 seconds, and then turn the ignition switch to the

"LOCK" (OFF) position. Moreover, the vehicle should be set to the following conditions for idling.

•

A/C switch: OFF

•

Lights and all accessories: OFF

•

Transmission: Neutral

•

Steering wheel: Straightforward position

Confirm that the diagnostic trouble code (DTC) is not output.
If a DTC is displayed, refer to Diagnostic Trouble Code Chart

P.13A-20

AKX01350

(3)

(2)

(1)

(4)

300 SECONDS OR MORE
56 - 64 km/h (35 - 40 mph)

ENGINE: IDLING
TRANSMISSION: NEUTRAL
300 SECONDS

ENGINE START

IGNITION
SWITCH:"LOCK"
(OFF)

64
(40)

32
(20)

100

VEHICLE
SPEED
km/h (mph)

<REFERENCE>
THROTTLE
OPENING
ANGLE (%)

AKX01350 AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-19

READINESS TEST STATUS

PURPOSE
The Readiness function also referred as I/M
Readiness or I/M Flags indicate if a full diagnostic
check has been "Completed" (is "Ready") for each
non-continuous monitor. Enhanced I/M State
Emission Programs will use the Readiness status
(Codes) to see if the vehicle is ready for OBD-II
testing. "Incomplete" (Not Ready) codes will be one
of the triggers for I/M failure.

OVERVIEW
The powertrain control module (PCM) monitors the
following main diagnosis items and records whether
the evaluation was completed or is incomplete. The
Readiness codes were established for the I/M
programs, thereby confirming that the vehicle was
not tampered with by erasing the diagnostic trouble
code(s) (DTC's) before I/M testing. The Readiness
and DTC codes can be reset by disconnecting the
battery or by erasing the codes with a scan tool. For
this reason all Readiness codes must read
"Complete" before I/M testing.
When the monitors run and complete, the MUT-II will
record the Readiness Code as "Complete" (General
Scan Tools record as "Ready"). If the monitor did not
run completely, the system then reads as
"Incomplete" (General Scan Tools record as "Not

Ready"). When the vehicle is operating normally and
the OBD-II Drive Cycle is carried out, Readiness
Code will set as "Complete" on the first drive cycle. If
during the first drive cycle a fault is detected then, a
second drive is required before the Readiness Code
will "Complete." If the fault is still there, then a DTC
will set.

•

Catalyst: P0421

•

Evaporative system: P0442, P0455

•

Heated oxygen sensor: P0130,P0133,
P0136,P0139

•

Heated oxygen sensor heater: P0135, P0141

•

EGR system: P0401

After the Readiness is "Complete," the technician is
assured that any DTC's associated with that monitor
will be displayed if the system has a problem. That is
why some State's I/M programs require the
Readiness Code as "Complete" before they check
for DTC's.

NOTE: After a repair is mode for a DTC the
technician should drive the OBD-II drive cycle
checking that the MUT-II records all Readiness as
"Complete".

FAIL-SAFE/BACKUP FUNCTION TABLE

M1131009100087

When the main sensor malfunctions are detected by the diagnostic test mode, the vehicle is controlled by
means of the following defaults.

MALFUNCTION ITEM

CONTROL CONTENTS DURING MALFUNCTION

Volume air flow sensor

•

Uses the throttle position sensor signal and engine speed signal (crankshaft
position sensor signal) for basic injector drive time and basic ignition timing
from the pre-set mapping.

•

Fixes the IAC motor in the appointed position so idle air control is not
performed.

Intake air temperature
sensor

Controls as if the intake air temperature is 25

C (77

F).

Throttle position sensor

No increase in fuel injection amount during acceleration due to the unreliable
throttle position sensor signal.

Engine coolant
temperature sensor

Controls as if the engine coolant temperature is 80

C (176

F). (This control will

be continued until the ignition switch is turned to the "LOCK" (OFF) position
even though the sensor signal returns to normal.)

Camshaft position sensor Injects fuel into the cylinders in the order 1-3-4-2 with irregular timing. (After the

ignition switch is turned to the "ON," the No.1 cylinder top dead center is not
detected at all.)

Barometric pressure
sensor

Controls as if the barometric pressure is 101 kPa (30 in Hg).

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-20

DIAGNOSTIC TROUBLE CODE CHART

M1131008700105

Heated oxygen sensor
<front>

Air/fuel ratio closed loop control is not performed.

Heated oxygen sensor
<rear>

Performs the closed loop control of the air/fuel ratio by using only the signal of
the heated oxygen sensor (front) installed on the front side of the catalytic
converter.

Generator FR terminal

No generator output suppression control is performed for the electrical load (to
be operated as an ordinary generator).

Communication line with
transaxle control module

No ignition timing retard control (overall engine-transaxle control) achieved
when transaxle speeds are changed.

Misfire detection

The PCM stops supplying fuel to the cylinder with the highest misfiring rate if a
misfiring that could damage the catalytic converter is detected.

MALFUNCTION ITEM

CONTROL CONTENTS DURING MALFUNCTION

DTC CODE

DIAGNOSTIC ITEMS

REFERENCE
PAGE

P0101