Mitsubishi Galant 9G. Manual - part 927

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-8

P0158

Heated oxygen sensor circuit high voltage (bank 2 sensor 2) 

P0159

Heated oxygen sensor circuit slow response (bank 2 sensor 2)

P0161

Heated oxygen sensor heater circuit (bank 2 sensor 2)

P0171

System too lean (bank 1)

P0172

System too rich (bank 1)

P0174

System too lean (bank 2)

P0175

System too rich (bank 2)

P0181

Fuel tank temperature sensor circuit range/performance

P0182

Fuel tank temperature sensor circuit low input

P0183

Fuel tank temperature sensor circuit high input

P0201

Injector circuit 

− cylinder 1

P0202

Injector circuit 

− cylinder 2

P0203

Injector circuit 

− cylinder 3

P0204

Injector circuit 

− cylinder 4

P0205

Injector circuit 

− cylinder 5

P0206

Injector circuit 

− cylinder 6

P0222*

Throttle position sensor (sub) circuit low input

P0223*

Throttle position sensor (sub) circuit high input

P0300

Random/multiple cylinder misfire detected

P0301

Cylinder 1 misfire detected

P0302

Cylinder 2 misfire detected

P0303

Cylinder 3 misfire detected

P0304

Cylinder 4 misfire detected

P0305

Cylinder 5 misfire detected

P0306

Cylinder 6 misfire detected

P0335*

Crankshaft position sensor circuit

P0340*

Camshaft position sensor circuit

P0401

Exhaust gas recirculation flow insufficient detected

P0403

Exhaust gas recirculation control circuit

P0421

Warm up catalyst efficiency below threshold (bank 1)

P0431

Warm up catalyst efficiency below threshold (bank 2)

P0441

Evaporative emission control system incorrect purge flow

P0442

Evaporative emission control system leak detected (Small leak)

P0443

Evaporative emission control system purge control valve circuit

P0446

Evaporative emission control system vent control circuit

P0451

Evaporative emission control system pressure sensor range/performance

P0452

Evaporative emission control system pressure sensor low input

P0453

Evaporative emission control system pressure sensor high input

P0455

Evaporative emission control system leak detected (Gross leak)

P0456

Evaporative emission control system leak detected (Very small leak)

DTC

ITEM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-9

P0461

Fuel level sensor circuit range/performance (main)

P0462

Fuel level sensor circuit low input

P0463

Fuel level sensor circuit high input

P0506

Idle control system RPM lower than expected

P0507

Idle control system RPM higher than expected

P0513

Immobilizer malfunction

P0551

Power steering pressure switch circuit range/performance

P0554

Power steering pressure switch circuit intermittent

P0603

EEPROM malfunction

P0606*

Powertrain control module main processor malfunction

P0630

VIN malfunction

P0638*

Throttle actuator control motor circuit range/ performance

P0642*

Throttle position sensor power supply

P0657

Throttle actuator control motor relay circuit malfunction

P0705

Transmission range switch circuit malfunction (RPNDL input)

P0712*

Transmission fluid temperature sensor circuit low input

P0713*

Transmission fluid temperature sensor circuit high input

P0715*

Input/Turbine speed sensor circuit

P0720*

Output speed sensor circuit

P0731*

Gear 1 incorrect ratio

P0732*

Gear 2 incorrect ratio

P0733*

Gear 3 incorrect ratio

P0734*

Gear 4 incorrect ratio

P0736*

Gear R incorrect ratio

P0741

Torque converter clutch circuit performance or stuck off

P0742

Torque converter clutch circuit stuck on

P0743*

Torque converter clutch circuit electrical

P0753*

Shift solenoid "A" electrical

P0758*

Shift solenoid "B" electrical

P0763*

Shift solenoid "C" electrical

P0768*

Shift solenoid "D" electrical

P1530

A/C1 switch circuit intermittent

P1602*

Communication malfunction (between PCM main processor and system LSI)

P1603*

Battery backup line malfunction

P1751*

A/T control relay malfunction

P2066

Fuel level sensor circuit range/performance (sub)

P2100*

Throttle actuator control motor circuit (open)

P2101*

Throttle actuator control motor magneto malfunction

P2122*

Accelerator pedal position sensor (main) circuit low input

P2123*

Accelerator pedal position sensor (main) circuit high input

DTC

ITEM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-10

NOTE: If the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates 
because of a malfunction of the powertrain control module (PCM), communication between the scan tool 
MB991958 (MUT-III sub assembly) and the PCM is impossible. In this case, the diagnostic trouble code can-
not be read.
NOTE: After the PCM has detected a malfunction, the Malfunction Indicator Lamp (SERVICE ENGINE 
SOON or Check Engine Lamp) illuminates when the engine is next turned on and the same malfunction is 
re-detected. However, for items marked with a "*" in the DTC NO. column, the Malfunction Indicator Lamp 
(SERVICE ENGINE SOON or Check Engine Lamp) illuminates only on the first detection of the malfunction.
NOTE: After the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates, 
it will be switched off under the following conditions.

.

•

When the PCM monitored the powertrain malfunction three times* and met set condition requirements, it 
detected no malfunction. *: In this case, "one time" indicates from engine start to next engine start.

•

For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant tempera-
ture, etc.) are similar to those when the malfunction was first recorded.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the 
sensor mounted at the position second closest to the engine.
NOTE: Bank 1 indicates the right bank side cylinder, and bank 2 indicates the left bank side cylinder.

P2127*

Accelerator pedal position sensor (sub) circuit low input

P2128*

Accelerator pedal position sensor (sub) circuit high input

P2135*

Throttle position sensor (main and sub) range/performance problem

P2138*

Accelerator pedal position sensor (main and sub) range/performance problem

P2227*

Barometric pressure circuit range/performance problem

P2228*

Barometric pressure circuit low input

P2229*

Barometric pressure circuit high input

U1108*

Combination meter time-out

DTC

ITEM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-11

HOW TO CONNECT THE SCAN TOOL (MUT-III)

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991910: Main Harness A

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. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON" 

position.
NOTE: When the special tool MB991824 is energized, spe-
cial tool MB991824 indicator light will be illuminated in a 
green color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting the scan tool MB991958 is the 
reverse of the connecting sequence, making sure that the 
ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC 
TROUBLE CODES.

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

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.
NOTE: If the battery voltage is low, diagnostic trouble codes will 
not be set. Check the battery if scan tool MB991958 does not 
display.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827