Mitsubishi Grandis. Manual — part 691

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-15

NOTE: If malfunctions have been detected in
multiple systems, store one malfunction only, which
has been detected first.

DRIVE CYCLE

The following five drive cycle patterns are performed on the diagnosis codes monitored during the vehicle
driving. The vehicle driving requires the patterns to identify the fault. In other words, doing such a drive allows
to regenerate any kind of trouble which involves illuminating the engine warming lamp (check engine lamp)
and to verify the repair procedure has eliminated the trouble [the engine warming lamp (check engine lamp) is
no longer illuminated].

CAUTION

Two technicians should always be in the vehicle when carrying out a test drive.
NOTE: Check that the diagnosis code is not output before traveling in the Drive cycle pattern. Erase the
diagnosis code if it has been output.
DRIVE CYCLE PATTERN LIST

81

Long-term fuel compensation (cylinder 1, 4)

%

82

Short-term fuel compensation (cylinder 1, 4)

%

83

Long-term fuel compensation (cylinder 2, 3)

%

84

Short-term fuel compensation (cylinder 2, 3)

%

87

Calculation load value

%

88

Fuel control condition
(cylinder 1, 4)

Open loop

OL

Closed loop

CL

Open loop owing to drive condition

OL-DRV.

Open loop owing to system malfunction

OL-SYS.

Closed loop based on one oxygen sensor

CL- H02S

89

Fuel control condition
(cylinder 2, 3)

Open loop

OL

Closed loop

CL

Open loop owing to drive condition

OL-DRV.

Open loop owing to system malfunction

OL-SYS.

Closed loop based on one oxygen sensor

CL- H02S

8A

Throttle position sensor (main)

%

−

Diagnosis code during data recording

-

Item No.

Data

Unit

Procedure

Monitor item

Diagnosis code

1

Catalytic converter monitor

P0421, P0431

2

Oxygen sensor (front) monitor

P0130, P0150

3

Other monitor

P0135, P0136, P0141,
P0155, P0156, P0161,
P0201, P0202, P0203,
P0204, P0300, P0301,
P0302, P0303, P0304,
P0325, P0500, P0551,
P0638

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-16

Procedure 1

Catalytic converter monitor
Diagnosis
code No.

P0421, P0431

Drive cycle
pattern

One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 16 minutes or more.

Inspection
condition

• Atmospheric temperature: −10°C or more

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 90 km/h or more.
3. Travel for 6 minutes or more while keeping the vehicle speed at 90 km/h or more.
4. Decelerate until the vehicle speed is within 80 km/h or less.
5. While traveling at 55

− 80 km/h for 10 minutes or more, fully close the throttle at least

once in 2 minutes and decelerate for 10 seconds or more.

• Do not repeat deceleration too often.

• Vehicle speed may go below 55 km/h after the deceleration.

• Stopping and braking are permitted. (If stopped or drive at 55 km/h or less for more

than 5 minutes the monitoring may be stopped. In this case please restart monitoring
from the beginning.)

6. After completing the above deceleration, bring the vehicle speed back to 55

− 80 km/h

and keep it in the range until starting the deceleration again.

• Repeat the above deceleration at least 5 times.

7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

AK301815

10 minutes or more

Ignition switch :
"LOCK" (OFF)
position

Engine Start

Vehicle
speed

6 minutes or more

90 km/h or more

55 - 80 km/h

(1)

(5,6)

(4)

(3)

(2)

(7)

Time

Stopping and braking
permitted

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-17

Procedure 2

Oxygen sensor (front) monitor
Diagnosis
code No.

P0130, P0150

Drive cycle
pattern

One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 16 minutes or more.

Inspection
conditions

• Engine coolant temperature: After engine warm up

• Atmospheric temperature: −10°C or more

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 55

− 80 km/h.

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

55

− 80km/h and travel for 16 minutes or more.

• Stopping and braking during this operation are permitted.

4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

AK301816AB

16 minutes or more

Ignition switch :
"LOCK" (OFF)
position

Engine Start

Vehicle
speed

55 - 80 km/h

(1)

(4)

(3)

(2)

Time

Stopping and braking
permitted

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-18

Procedure 3

READINESS TEST STATUS

The engine-ECU <M/T> or engine-A/T-ECU <A/T>
monitors the following main diagnosis items, judges
if these items are in good condition or not, and the
stores its history. this history can be read out by
using MUT-III. (If the ECU has judged a item before,
the MUT-III displays "Complete").

In addition, if diagnosis codes are erased or the
battery cable is disconnected, this history will also be
erased (the memory will be reset).

• Catalyst: P0421, P0431

• Oxygen sensor: P0130, P0136, P0150, P0156

• Oxygen sensor heater: P0135, P0141, P0155,

P0161

FAIL-SAFE FUNCTION REFERENCE TABLE

When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by
means of the pre-set control logic to maintain safe conditions for driving.

Other monitor
Diagnosis
code No.

P0135, P0136, P0141, P0155, P0156, P0161, P0201, P0202, P0203, P0204, P0300,
P0301, P0302, P0303, P0304, P0325, P0500, P0551, P0638

Drive cycle
pattern

One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 21 minutes or more.

Inspection
conditions

• Engine coolant temperature: After engine warm up

• Atmospheric temperature: −10°C or more

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 55 km/h.
3. While keeping the acceleator pedal opening degree constant, keep the vehicle speed at

55 km/h and travel for 16 minutes or more.

4. Return the vehicle to the shop.
5. After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch

to "LOCK" (OFF) position.

AK301817

16 minutes or more

Ignition switch :
"LOCK" (OFF)
position

Engine Start

Vehicle
speed

55 km/h or more

(1)

(4)

(3)

(2)

(5)

Time

AB

5 minutes or more
Engine: Idling
Transmission: Neutral