Mitsubishi 380. Manual - part 541

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-256

STEP 1. Using diagnostic tool, check data list item AF: 
Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

CAUTION

To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool .
(1) Connect diagnostic tool  to the data link connector.
(2) Start the engine and run at idle.
(3) Set diagnostic tool  to the data reading mode for item AF, 

Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

(4) Warm up the engine.

• Warming up the engine. When the engine is revved, the 

output voltage should alternate between 0 and 0.6 to 1.0 
volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Replace the heated oxygen sensor (rear). Then go to 

Step 2. 

STEP 2. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− EOBD Drive Cycle −

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).

Q: Is DTC P0159 set?

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

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-257

DTC P0160: Heated Oxygen Sensor Circuit No Activity (bank 2, sensor 2).

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the 
ENGINE-ECU (terminal No. 30) from the output 
terminal (terminal No. 1) of the left bank heated 
oxygen sensor (rear).

• Terminal No. 2 of the left bank heated oxygen 

sensor (rear) is grounded with ENGINE-ECU (ter-
minal No. 29) .

• The ENGINE-ECUapplies an offset voltage of 0.5 

volt to terminal No. 2 of the left bank heated oxy-
gen sensor (rear).

.

TECHNICAL DESCRIPTION

• The output signal of the heated left bank oxygen 

sensor (front) is compensated by the output sig-
nal of the left bank heated oxygen sensor (rear).

• The ENGINE-ECU checks for the left bank 

heated oxygen sensor (rear) output voltage.

.

DTC SET CONDITIONS

Check Conditions

• Battery voltage is between 10.7 and 16.1volts.

• Engine speed is above 20 r/min.

• Engine start achieved.

Judgment Criteria

• Signal check.

• MIL is activated after 2 Drive cycles.

• No limp home.

.

EOBD DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− EOBD Drive Cycle − 

P.13A-11

.

.

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

• Left bank heated oxygen sensor (rear) failed.

• Open circuit in left bank heated oxygen sensor 

(rear) output line.

• Open circuit in left bank heated oxygen sensor 

(rear) sensor ground.

• Wiring harness or connector damage.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

AK303079

CONNECTOR: B-24

AB

LEFT BANK

HEATED OXYGEN

SENSOR (REAR)

B-24 (GR)

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-258

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using diagnostic tool, check data list item AF: 
Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

CAUTION

To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool .
(1) Connect diagnostic tool  to the data link connector.
(2) Start the engine and run at idle.
(3) Ensure engine is at running temperature (80

° C or higher).

(4) Set diagnostic tool  to the data reading mode for item AD, 

Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

• Warming up the engine. When the engine is revved, the 

output voltage should alternate between 0 and 0.6 to 1.0 
volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Then go to Step 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-259

STEP 2. Measure the sensor output voltage at 
ENGINE-ECU connector B-20 by using  ENGINE-ECU 
check harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect  

ENGINE-ECU check harness special tool MB992044 
between the separated connectors.

(2) Start the engine and run at idle.
(3) Ensure engine is at running temperature (80

° C or higher).

(4) Measure the voltage between terminal No. 30 and ground.

• Warm engine. When the engine is revved, the output 

voltage should alternate between 0 and 0.6-1.0 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage cycling within the specified 

range?
YES : Go to Step 6.
NO :  Then go to Step 3.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB213A

B-20 HARNESS 

CONNECTOR