Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 78

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-11

5. Erase the diagnostic trouble code(s).

6. Turn the ignition switch to the "LOCK" (OFF) position.

7. Disconnect scan tool MB991502 from the data link

connector.

8. Start the engine again and do a test drive to confirm that the

problem is eliminated.

ON-BOARD DIAGNOSTICS

The engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T> monitors the input/
output signals (some signals all the time and others under specified conditions) of the ECM <M/T> or PCM
<A/T>. When a malfunction continues for a specified time or longer after the irregular signal is initially
monitored, the ECM <M/T> or PCM <A/T> judges that a malfunction has occurred. After the ECM <M/T> or
PCM <A/T> first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted
and the same malfunction is re-detected. However, for items marked with a "*," a diagnostic trouble code is
recorded on the first detection of the malfunction. There are 51 diagnostic items. The diagnostic results can
be read out with a scan tool. Since memorization of the diagnostic trouble codes is backed up directly by the
battery, the diagnostic results are memorized even if the ignition key is turned off. The diagnostic trouble
codes will, however, be erased when the battery terminal or the ECM <M/T> or PCM <A/T> connector is
disconnected. In addition, the diagnostic trouble code can also be erased by turning the ignition switch to ON
and sending the diagnostic trouble code erase signal from scan tool MUT-II (MB991502) to the ECM <M/T>
or PCM <A/T>.

NOTE: If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble code
is memorized. In this case, send the diagnostic trouble code erase signal to the ECM <M/T> or PCM <A/T> in
order to erase the diagnostic memory. The 51 diagnostic items are all indicated sequentially from the smallest
code number. The ECM <M/T> or PCM <A/T> records the engine operating condition when the diagnostic
trouble code is set. This data is called "Freeze-frame" date. This data can be read by using the scan tool, and
can then be used in simulation tests for troubleshooting. Data items are as follows:

OBD- II DRIVE CYCLE

All kinds of diagnostic trouble codes (DTCs) can be monitored by carrying out a short drive according to the
following six drive cycle pattern. In other words, doing such a drive regenerates any kind of trouble which
involves illuminating the Service Engine Soon/Malfunction Indicator Lamp and verifies the repair procedure
has eliminated the trouble (the Service Engine Soon/Malfunction Indicator Lamp is no longer illuminated).

DATA

UNIT

Engine coolant temperature

°

C or

°

F

Engine speed

r/min

Vehicle speed

km/h or mph

Long-term fuel compensation (long-term fuel trim)

%

Short-term fuel compensation (short-term fuel trim)

%

Fuel control condition

•

Open loop

•

Closed loop

•

Open loop-drive condition

•

Open loop-DTC set

•

Closed loop-O

2

(rear) failed

Calculation load value

%

Diagnostic trouble code during data recording

-

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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CAUTION

Two technicians should always be in the vehicle when carrying out a test drive.

NOTE: Check that the diagnosis trouble code (DTC) is not output before traveling in the drive cycle pattern.
Erase the DTC if it has been output.

DRIVE CYCLE PATTERN LIST

PROCE-
DURE

MONITOR ITEM

DIAGNOSTIC TROUBLE
CODE (DTC)

1

Evaporative emission control system leak monitor

P0442, P0450,P0451, P0455

2

Fuel trim monitor

P0171,P0172

3

Catalytic converter monitor

P0421

4Heated oxygen sensor monitor

P0130, P0133,P0136,P0139

5

Exhaust gas recirculation (EGR) system monitor

P0401

6

Other monitor

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 cir-
cuit

P0130, P0135, P0136,
P0141, P0201, P0202,
P0203, P0204, P0403,
P0443, P0446, P1500

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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PROCEDURE 1

EVAPORATIVE EMISSION CONTROL SYSTEM LEAK MONITOR

DTC

P0442, P0450,P0451, P0455

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 8 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: 45

°

C (113

°

F) or less (The engine is stopped before the test drive is started)

•

Atmospheric temperature: 5

−

45

°

C (41

−

113

°

F)

•

Condition of A/T: Selector lever D range

Test procedure

1. Engine: start
2. Accelerate until the vehicle speed is 89

−

97 km/h (55

−

60 mph).

3. Travel for 200 seconds or more while keeping the vehicle speed at 89

−

97 km/h (55 - 60 mph). (M/T: 5th

speed)

4. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89

−

97 km/h (55

−

60 mph) and travel for 150 seconds or more. (During monitor)

5. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
6. Confirm that the diagnostic trouble code (DTC) is not output.
7. If DTC P0442 is output, refer to DTC P0442

−

Evaporative Emission Control System Leak Detected

P.13A-

211

.

If DTC P0450 is output, refer to DTC P0450

−

Evaporative Emission Control System Pressure Sensor

Malfunction

P.13A-236

.

If DTC P0451 is output, refer to DTC P0451

−

Evaporative Emission Control System Pressure Sensor Range/

performance

P.13A-250

.

If DTC P0455 is output, refer to DTC P0455

−

Evaporative Emission Control System Leak Detected (Gross

Leak)

P.13A-264

.

AKX01345

AKX01345

(3)

(2)

(1)

(4)

(5)

200 SECONDS
OR MORE

PREPARATION
PERIOD

ENGINE START

IGNITION SWITCH:
"LOCK" (OFF) position

DURING
MONITOR

150 SECONDS
OR MORE

89 - 97 km/h (55 - 60 mph)
M/T: 5TH SPEED

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

CALCULATED
LOAD (%)

AKX01345 AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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PROCEDURE 2

FUEL TRIM MONITOR

DTC

P0171,P0172

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 35 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

−

97

°

C (176 - 207

°

F)

•

Atmospheric temperature: -10

−

60

°

C (14

−

140

°

F)

•

Condition of A/T: Selector lever D range

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 89

−

97 km/h (55

−

60 mph).

3. Travel for 30 minutes or more while keeping the vehicle speed at 89

−

97 km/h (55 - 60

mph). (M/T: 5th speed) Carry out one gradual deceleration/acceleration returning to 89

−

97 km/h (55

−

60 mph) within 120 seconds. (During monitor)

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

If DTC P0171 is output, refer to DTC P0171

−

System too lean (Bank1)

P.13A-151

. If DTC

P0172 is output, refer to DTC P0171

−

System too rich (Bank1)

P.13B-205

.

AKX01346

AKX01346

(3)

(2)

(1)

(4)

30 MINUTES OR MORE
89 - 97 km/h (55 - 60 mph)
M/T: 5TH SPEED

WITH 120 SECONDS

ENGINE START

IGNITION SW-
ITCH: "LOCK"
(OFF) position

DURING MONITOR

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

CALCULATED
LOAD (%)

AKX01346 AC