Mitsubishi Outlander GS45X. Manual — part 778

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-45

PATTERN 16

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PATTERN 17

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Drive cycle
pattern

Inspection
condition

Condition of A/T: Selector lever "D" range

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Accelerate until the vehicle speed is more than 50 km/h (31 mph).
3. Stop the vehicle in a safe place and let the engine idle for 20 seconds. (During the

monitor)

4. Repeat Steps 2 and 3 for 10 times.
5. Stop the vehicle in a safe place and turn the ignition switch to "LOCK" (OFF) position.
6. Start the engine and do Steps 1 to 5 again.
7. Confirm that the diagnostic trouble code (DTC) is not output.

AK402438

(3)

(2)

(1)

20 seconds

1st
mon-
itor

9th
mon-
itor

10th
mon-
itor

2nd
mon-
itor

Ignition
switch:
"LOCK" (OFF)

50 km/h
(31 mph)

Vehicle speed

AC

(3)

(2)

(2)

(3)

(3)

(2)

(5)

Idling

(2)

20 seconds

Time

Drive cycle
pattern

Inspection
conditions

• Engine coolant temperature: More than 20°C (68°F)

• Condition of A/T: Selector lever "D" range

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Drive the vehicle at more than 50 km/h (31 mph) for 30 seconds. (During the monitor)
3. Stop the vehicle in a safe place and turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

AK402441

(2)

(1)

(3)

30 seconds

During the monitor

50 km/h
(31 mph)

Ignition
switch:
"LOCK" (OFF)

Vehicle speed

AP

Time

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-46

PATTERN 18

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PATTERN 19

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PATTERN 20

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PATTERN 21

.

Inspection
conditions

• Engine coolant temperature: More than 41°C (106°F)

• Intake air temperature: More than −10°C (14°F)

• Barometric pressure: More than 76 kPa (22.4 in.Hg)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 1 minute. (During the monitor)
3. Turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

Inspection
condition

Engine coolant temperature: More than 77

°C (171°F)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 40 seconds.
3. Drive the engine at more than 5,200 r/min for 5 seconds. (During the monitor)
4. Turn the ignition switch to "LOCK" (OFF) position.
5. Start the engine and do Steps 1 to 4 again.
6. Confirm that the diagnostic trouble code (DTC) is not output.

Inspection
conditions

Engine coolant temperature: More than 76

°C (169°F)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 15 minutes. (During the monitor)
3. Turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

Inspection
conditions

• Intake air temperature: More than −10°C (14°F)

• Engine coolant temperature: More than 7°C (45°F)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 8 minutes. (During the monitor)
3. Turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-47

PATTERN 22

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PTTERN 23

SYSTEM READINESS TEST STATUS

.

PURPOSE

The Readiness function (also referred to as I/M
Readiness or I/M Flags) indicates if a full diagnostic
check has been "Completed" (is "Ready") for each
non-continuous monitor. Enhanced I/M State Emis-
sion Programs will use the Readiness status (Codes)
to see if the vehicle is ready for OBD-II testing.
"Incomplete" (Not Ready) codes will be one of the
triggers for I/M failure.

.

OVERVIEW

The ECM monitors the following main diagnosis
items and records whether the evaluation was com-
pleted or is incomplete. The Readiness Codes are
established for the I/M programs, thereby confirming
that the vehicles have not been tampered with by
erasing the diagnostic trouble code(s) (DTCs) before
I/M testing. The Readiness Codes and DTCs can be
reset by disconnecting the battery or by erasing the
codes with a scan tool MB991958 (M.U.T.-III sub
assembly). For this reason, all the Readiness Codes
must be displayed "Complete" before I/M testing.

When the monitors run and complete, the scan tool
MB991958 (M.U.T.-III sub assembly) will display the
Readiness Codes as "Complete" (General Scan
Tools display as "Ready"). When the vehicle is oper-
ating normally and the OBD-II Drive Cycle is carried
out, the Readiness Codes will be set as "Complete"
on the first drive cycle. For DTCs requiring two drive
cycles to detect a fault, the second drive cycle is
required to set the Readiness Codes as "Complete"
if a fault is detected during the first drive cycle. If the
fault is still there after the second drive cycle, a DTC
will be set.

• Catalyst: P0421, P0431

• Evaporative system: P0442, P0455, P0456

• Heated oxygen sensor: P0133, P0139, P0140,

P0153, P0159, P0160

• Heated oxygen sensor heater: P0031, P0037,

P0051, P0053, P0057, P0059

• EGR system: P0401

After all the Readiness Codes are displayed as
"Complete", the technician is assured that any DTCs
related to the monitor will be displayed if the system
has a problem. That is why some State's I/M pro-
grams require the Readiness Code as "Complete"
before they check for DTCs.
NOTE: After a repair is made for a DTC, the techni-
cian should drive the OBD-II Drive Cycle checking
that the scan tool MB991958 (M.U.T.-III Sub Assem-
bly) displays all the Readiness Codes as "Complete".

Inspection
conditions

• Engine coolant temperature: More than 0°C (32°F) <Mainfold absolute pressure sensor

monitor>

• Fuel amount at engine start: Less than 80 % <Fuel tank pressure sensor monitor>

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle at the engine speed less than 1,000 r/min for 15 seconds. (During the

monitor)

3. Turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

Inspection
conditions

• Engine coolant temperature: More than 7 °C (45 °F), less than 41 °C (106 °F)

• Intake air temperature: More than −10 °C (14 °F)

• Barometric pressure: More than 76 kPa (22.4 in.Hg)

Test procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 1 minute. (During the monitor)
3. Turn the ignition switch to "LOCK" (OFF) position.
4. Start the engine and do Steps 1 to 3 again.
5. Confirm that the diagnostic trouble code (DTC) is not output.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-48

FAIL-SAFE FUNCTION REFERENCE TABLE

M1131153000802

When the main sensor malfunctions are detected by the diag-
nostic test mode, the vehicle is controlled by means of the fol-
lowing defaults.

MALFUNCTION ITEM

CONTROL CONTENTS DURING MALFUNCTION

Mass airflow sensor

• Uses the throttle position sensor signal and engine speed signal (crankshaft

position sensor signal) for basic injector drive time and basic ignition timing
from the pre-set mapping.

Intake air temperature
sensor

Controls as if the intake air temperature is 25

°C (77°F).

Engine coolant
temperature sensor

Controls as if the engine coolant temperature is 80

°C (176°F). (This control will

be continued until the ignition switch is turned to "LOCK" (OFF) position even
though the sensor signal returns to normal.)

Camshaft position
sensor

Injects fuel simultaneously into all cylinders. (After the ignition switch is turned
to "ON" position, the No.1 cylinder top dead center is not detected at all.)

Barometric pressure
sensor

Controls as if the barometric pressure is 101 kPa (30 in.Hg).

Knock sensor

Switches the ignition timing from ignition timing for high octane to ignition timing
for standard octane fuel.

Heated oxygen sensor
front

Air/fuel ratio closed loop control is not performed.

Heated oxygen sensor
rear

Performs the closed loop control of the air/fuel ratio by using only the signal of
the heated oxygen sensor (front) installed on the front side of the catalytic
converter.

Generator FR terminal

No generator output suppression control is performed for the electrical load (to
be operated as an ordinary generator).

Misfire detection

The ECM stops supplying fuel to the cylinder with the highest misfire rate if a
misfire that could damage the catalytic converter is detected.

Accelerator pedal
position sensor (main)

• Detects the amount of the accelerator pedal travel through the use of the

accelerator pedal position sensor (sub) signal, but rendering it only as being
approximately one-half the normal opening angle.

• Prohibits the operation of the auto-cruise control.

• Cuts off fuel when the engine speed exceeds 3,000 r/min.

• Suppresses the engine output by stopping the electronically controlled

throttle valve system if the accelerator pedal position sensor (sub) is also
malfunctioning.

Accelerator pedal
position sensor (sub)

• Detects the amount of the accelerator pedal travel through the use of the

accelerator pedal position sensor (main) signal, but rendering it only as
being approximately one-half the normal opening angle.

• Prohibits the operation of the auto-cruise control.

• Cuts off fuel when the engine speed exceeds 3,000 r/min.

• Suppresses the engine output by stopping the electronically controlled

throttle valve system if the accelerator pedal position sensor (main) is also
malfunctioning.