Mitsubishi Galant 9G. Manual - part 930

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-20

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 Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) and
verifies the repair procedure has eliminated [the trouble the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) is no longer illuminated].

CAUTION

Two technicians should always be in the vehicle when carrying out a test.
NOTE: Check that the diagnosis trouble code (DTC) is not output before driving the OBD-II drive cycle. Erase
the DTC if it has been output.
DRIVE CYCLE PATTERN LIST

PROCEDURE

MONITOR ITEM

DIAGNOSTIC TROUBLE
CODE (DTC)

Evaporative emission system leak monitor

P0441, P0442, P0451,
P0452, P0453, P0455,
P0456

Fuel trim monitor

P0171, P0172, P0174,
P0175

Catalytic converter monitor

P0421, P0431

Heated oxygen sensor monitor

P0133, P0139, P0153,
P0159

Exhaust gas recirculation (EGR) system monitor

P0401

Other monitor

Main components

P0106, P0107, P0108,
P0134, P0154, P0300,
P0301, P0302, P0303,
P0304, P0305, P0306,
P0506, P0507

Sensors and switches

P0069, P0101, P0102,
P0103, P0111, P0112,
P0113, P0116, P0117,
P0118, P0125, P0181,
P0182, P0183, P0335,
P0340, P0461, P2066

Wire breakage and short
circuit

P0130, P0131, P0132,
P0135, P0136, P0137,
P0138, P0141, P0150,
P0151, P0152, P0155,
P0156, P0157, P0158,
P0161, P0201, P0202,
P0203, P0204, P0205,
P0206, P0403, P0443,
P0446, P0462, P0463,
P2228, P2229

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-21

PROCEDURE 1

EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
DTC

P0441, P0442, P0451, P0452, P0453, P0455, P0456

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while
driving the vehicle 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

AKX01345

(3)

(2)

(1)

(4)

(5)

200 SECONDS
OR MORE

PREPARATION
PERIOD

ENGINE START

IGNITION
SWITCH:
"LOCK" (OFF)

DURING
MONITOR

150 SECONDS
OR MORE

89 - 97 km/h (55 - 60 mph)

97
(60)

64
(40)

32
(20)

100

VEHICLE SPEED
km/h (mph)

AKX01345 AB

CALCULATED
LOAD (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-22

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).

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

− 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 P0441 is output, refer to DTC P0441

− Evaporative Emission control System

Incorrect Purge Flow

P.13B-669

If DTC P0442 is output, refer to DTC P0442

− Evaporative Emission control System Leak

Detected (Small Leak)

P.13B-674

If DTC P0451 is output, refer to DTC P0451

− Evaporative Emission control System

Pressure Sensor Range/performance

P.13B-733

If DTC P0452 is output, refer to DTC P0452

− Evaporative Emission control System

Pressure Sensor Low Input

P.13B-754

If DTC P0453 is output, refer to DTC P0453

− Evaporative Emission control System

Pressure Sensor High Input

P.13B-775

If DTC P0455 is output, refer to DTC P0455

− Evaporative Emission control System Leak

Detected (Gross Leak)

P.13B-796

If DTC P0456 is output, refer to DTC P0456

− Evaporative Emission control System Leak

Detected (Very Small Leak)

P.13B-812

EVAPORATIVE EMISSION SYSTEM LEAK MONITOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-23

PROCEDURE 2

FUEL TRIM MONITOR
DTC

P0171, P0172, P0174, P0175

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while
driving the vehicle 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 to 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). 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.
6. If DTC P0171 is output, refer to DTC P0171

− System too lean (Bank1)

P.13B-414

If DTC P0172 is output, refer to DTC P0172

− System too rich (Bank1)

P.13B-425

If DTC P0174 is output, refer to DTC P0174

− System too lean (Bank2)

P.13B-432

If DTC P0175 is output, refer to DTC P0175

− System too rich (Bank2)

P.13B-442

AKX01346