Mitsubishi Evolution X. Manual — part 265

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-37

PATTERN 15

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PATTERN 16

Drive cycle
pattern

Inspection
condition

Condition of TC-SST: Shift 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).

• Engine speed: More than 2,500 r/min

• Engine load: More than 55 %

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 65° C (149° F)

• Condition of TC-SST: Shift 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

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MULTIPORT FUEL INJECTION (MFI)

13A-38

.

PATTERN 17

.

PATTERN 18

.

PATTERN 19

.

PATTERN 20

.

Inspection
conditions

Condition of TC-SST: Shift lever "D" range

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Drive the vehicle with the accelerator pedal fully depressed for 5 seconds. (During the

monitor)

3. Stop at 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.

Inspection
conditions

• Engine coolant temperature: More than 82° C (180° F)

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

• Barometric pressure: More than 76 kPa (22.5 inHg)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Accelerate until the vehicle speed is more than 1.5 km/h (1 mph).
3. Stop the vehicle in a safe place and let the engine idle for 1 minute. (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 7° C (45° F), less than 36° C (97° F)

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

• Barometric pressure: More than 76 kPa (22.5 inHg)

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
conditions

• Engine coolant temperature: More than 77° C (171° F), less than 87° C (189° F)

• Barometric pressure: More than 76 kPa (22.5 inHg)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Drive the engine at 1,200

− 1,500 r/min for 30 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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-39

PATTERN 21

.

PATTERN 22

.

PATTERN 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: P0420

• Evaporative system: P0442, P0455, P0456

• Heated oxygen sensor: P0133, P0139

• Heated oxygen sensor heater: P0031, P0032,

P0037, P0038

Inspection
condition

Engine coolant temperature: More than 82

° C (180° 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 sensor: More than 7° C (45° F)

Test
procedure

1. Start the engine with all the accessories switched OFF.
2. Let the engine idle for 4 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

• Fuel temperature sensor: Less than 36° C (96° F) <Fuel tank pressure sensor monitor>

• Fuel amount at engine start: Less than 85 % <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. Confirm that the diagnostic trouble code (DTC) is not output.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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".

FAIL-SAFE FUNCTION REFERENCE TABLE

M1131153000857

The control is carried out, which keeps the safety driving by the preset controllogic when the diagnosis code
is output. The diagnosis code having the fail-safe function is as follows.

DTC

DIAGNOSTIC ITEM

FAIL-SAFE AND BACKUP FUNCTION

P0096

Intake air temperature circuit
range/performance problem (sensor 2)

Control as if the intake air temperature in the
intake manifold is 25

° C.

P0097

Intake air temperature circuit low input
(sensor 2)

Control as if the intake air temperature in the
intake manifold is 25

° C.

P0098

Intake air temperature circuit high input
(sensor 2)

Control as if the intake air temperature in the
intake manifold is 25

° C.

P0111

Intake air temperature circuit
range/performance problem (sensor 1)

Control as if the intake air temperature is
25

° C.

P0112

Intake air temperature circuit low input
(sensor 1)

Control as if the intake air temperature is
25

° C.

P0113

Intake air temperature circuit high input
(sensor 1)

Control as if the intake air temperature is
25

° C.

P0116

Engine coolant temperature circuit
range/performance problem

Control as if the engine coolant temperature
is 80

° C.

P0117

Engine coolant temperature circuit low input Control as if the engine coolant temperature

is 80

° C.

P0118

Engine coolant temperature circuit high input Control as if the engine coolant temperature

is 80

° C.

P0122

Throttle position sensor (main) circuit low
input

• Throttle opening degree is restricted.

• Throttle opening degree position is in

default position if throttle position sensor
(sub) fails.

P0123

Throttle position sensor (main) circuit high
input

• Throttle opening degree is restricted.

• Throttle opening degree position is in

default position if throttle position sensor
(sub) fails.

P0125

Insufficient coolant temperature for closed
loop fuel control

Control as if the engine coolant temperature
is 80

° C.

P0222

Throttle position sensor (sub) circuit low input

• Throttle opening degree is restricted.

• Throttle opening degree position is in

default position if throttle position sensor
(main) fails.

P0223

Throttle position sensor (sub) circuit high
input

• Throttle opening degree is restricted.

• Throttle opening degree position is in

default position if throttle position sensor
(main) fails.

P0234

Turbocharger wastegate system malfunction Fuel is cut in abnormal engine overboost

condition.