Mitsubishi Galant (2004+). Manual - part 802

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-25

.

Test 
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 72 km/h (45 mph).
3. Travel for 300 seconds or more while keeping the vehicle speed at 72 

− 97 km/h (45 − 60 

mph).

4. Decelerate until the vehicle speed is within 56 

− 64 km/h (35 − 40 mph).

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

56 

− 64 km/h (35 − 40 mph) and travel for 90 seconds or more. (During monitor)

6. Fully close the throttle and decelerate, and keep the deceleration state for 10 seconds. 

Then, quickly accelerate until the vehicle speed reaches 56 

− 64 km/h (35 − 40 mph). 

Then, repeat steps 5 and 6, and complete six monitor sessions.

7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
8. Confirm that the diagnostic trouble code (DTC) is not output.
9. If DTC P0421 is output, refer to DTC P0421 

− Warm Up Catalyst Efficiency Below 

Threshold (cylinder 1, 4) 

P.13A-592

.

If DTC P0431 is output, refer to DTC P0431 

− Warm Up Catalyst Efficiency Below 

Threshold (cylinder 2, 3) 

P.13A-597

.

CATALYTIC CONVERTER MONITOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-26

PROCEDURE 4

HEATED OXYGEN SENSOR MONITOR
DTC

P0133, P0139, P0153, P0159

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 5 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: −10°C (14°F) or more

• Condition of A/T: Selector lever D range

AKX01348

AKX01348

(3)

(2)

(1)

(4)

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

ENGINE 
START

IGNITION 
SWITCH: "LOCK"
(OFF)

DURING MONITOR

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

AKX01348 AB

CALCULATED
LOAD (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-27

.

Test 
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 56 

− 64 km/h (35 − 40 mph).

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

56 

− 64 km/h (35 − 40 mph) and travel for 120 seconds or more. (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 P0133 is output, refer to DTC P0133 

− Cylinder 1, 4 Heated Oxygen Sensor Circuit 

Slow Response (Sensor 1) 

P.13A-219

. 

If DTC P0139 is output, refer to DTC P0139 

− Cylinder 1, 4 Heated Oxygen Sensor Circuit 

Slow Response (Sensor 2) 

P.13A-278

.

If DTC P0153 is output, refer to DTC P0153 

− Cylinder 2, 3 Heated Oxygen Sensor Circuit 

Slow Response (Sensor 1) 

P.13A-327

. 

If DTC P0159 is output, refer to DTC P0159 

− Cylinder 2, 3 Heated Oxygen Sensor Circuit 

Slow Response (Sensor 2) 

P.13A-385

.

HEATED OXYGEN SENSOR MONITOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-28

PROCEDURE 5

EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
DTC

P0401

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 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

AKX01349

(2)

AKX01349

(3)

(5)

(5)

(5)

(5)

(2)

(1)

(4)

(4)

(4)

(4)

(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

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

64
(40)

32
(20)

0

100

50

0

VEHICLE 
SPEED
km/h (mph)

AKX01349AB

CALCULATED
LOAD (%)