Mitsubishi Galant (2004+). Manual - part 1083

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-25

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) <3.8L ENGINE>

13B-26

.

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 

− O

2

 Sensor Circuit Slow Response (Bank 1 

Sensor 1) 

P.13B-220

. 

If DTC P0139 is output, refer to DTC P0139 

− O

2

 Sensor Circuit Slow Response (Bank 1 

Sensor 2) 

P.13B-280

.

If DTC P0153 is output, refer to DTC P0153 

− O

2

 Sensor Circuit Slow Response (Bank 2 

Sensor 1) 

P.13B-330

. 

If DTC P0159 is output, refer to DTC P0159 

− O

2

 Sensor Circuit Slow Response (Bank 2 

Sensor 2) 

P.13B-389

.

HEATED OXYGEN SENSOR MONITOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-27

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 (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-28

.

Test 
procedure

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

− 64 km/h (35 − 40 mph).

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

− 64 km/h (35 − 40 

mph).

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

− 3,000 r/min, and while keeping 

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

5. 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.

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

− Exhaust Gas Recirculation Flow Insufficient 

detected 

P.13B-621

.

EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR