Mitsubishi Lancer Evolution X. Manual - part 401

 

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Mitsubishi Lancer Evolution X. Manual - part 401

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-669

STEP 12. Check for harness damage between accelerator 
pedal position sensor connector C-01 (terminal No. 4) and 
ECM connector B-10 (terminal No. 78).
Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair it. Then go to Step 16.

STEP 13. Check for harness damage between accelerator 
pedal position sensor connector C-01 (terminal No. 3) and 
ECM connector B-10 (terminal No. 74).
Q: Is the harness wire in good condition?

YES : Go to Step 14.
NO :  Repair it. Then go to Step 16.

STEP 14. Check for harness damage between accelerator 
pedal position sensor connector C-01 (terminal No. 6) and 
ECM connector B-10 (terminal No. 77).
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO :  Repair it. Then go to Step 16.

STEP 15. Replace the accelerator pedal position sensor.
(1) Replace the accelerator pedal position sensor.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2138 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 16.

NO :  The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-670

STEP 16. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2138 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

DTC P2195: Heated Oxygen Sensor (front) Inactive

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK704228

AB

Heated oxygen
sensor (front)

Connector: C-34

C-34 (B)

SRS-ECU

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-671

TECHNICAL DESCRIPTION

• The ECM effects air/fuel ratio feedback control in 

accordance with the signals from the heated oxy-
gen sensor (front).

• If the heated oxygen sensor (front) has deterio-

rated, corrections will be made by the heated 
oxygen sensor (rear).

• DTC P2195 becomes stored in memory if a fail-

ure is detected in the heated oxygen sensor 
(front).

.

DESCRIPTIONS OF MONITOR METHODS

Heated oxygen sensor (front) output voltage does 

not cross lean/rich criteria (about 0.5 volt) within 
specified period.

.

MONITOR EXECUTION

Continuous

.

MONITOR EXECUTION CONDITIONS 
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Heated oxygen sensor (front) heater monitor
• Misfire monitor

Sensor (The sensor below is determined to be 

normal)

• Engine coolant temperature sensor
• Intake air temperature sensor

.

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• More than 300 seconds have passed since the 

engine starting sequence was completed.

• Engine coolant temperature is higher than 7° C 

(45° F).

• Under the closed loop air/fuel ratio control.
• Intake air temperature is more than −10° C (14°  

F).

AK604365

Good

Malfunction

End

No

No

No

128secs have passed?

Heated oxygen

sensor (front) output voltage

< lean/rich criteria

Start

Yes

Yes

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-672

Judgement Criterion

• Heated oxygen sensor (front) output voltage is 

less than lean/rich criteria (about 0.5 volt) for 128 
seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 22 

P.13A-9

.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are: )

• Heated oxygen sensor (front) deteriorated.
• ECM failed. 

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

• MB991658: Test Harness

STEP 1. Check the heated oxygen sensor (front).
(1) Disconnect the heated oxygen sensor (front) connector 

C-34 and connect test harness special tool MB991658 to 
the connector on the heated oxygen sensor (front) side.

(2) Warm up the engine until engine coolant temperature 

reaches 80° C (176° F) or higher.

(3) Rev the engine for 5 minutes or more with the engine speed 

of 2,000 r/min.

(4) Connect a digital voltage meter between terminal No. 3 and 

terminal No. 4.

(5) While repeatedly revving the engine, measure the heated 

oxygen sensor (front) output voltage.

Standard value: 0.6  1.0 V

CAUTION

• Be very careful when connecting the jumper wires; 

incorrect connection can damage the heated oxygen 
sensor.

• Be careful the heater can be damaged if a voltage 

beyond 8 volts is applied to the heated oxygen sensor 
heater.
NOTE: If the sufficiently high temperature [of approximate 
400

°

C (752

°

F) or more] is not reached although the heated 

oxygen sensor is normal, the output voltage would be possi-
bly low although the rich air/fuel ratio. Therefore, if the out-
put voltage is low, use a jumper wire to connect the terminal 
No. 1 and the terminal No. 2 of the heated oxygen sensor 
with the positive terminal and the negative terminal of 8 
volts power supply respectively, then check again.

Q: Is the measured voltage between 0.6 and 1.0 volt?

YES : Go to Step 2.
NO :  Replace the heated oxygen sensor (front). Then go to 

Step 3.

AK604493AB

MB991658

Heated oxygen
sensor component
side connector

 

 

 

 

 

 

 

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