Mitsubishi Galant 9G. Manual - part 965

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-160

STEP 9. Check for open circuit between engine coolant 
sensor connector B-104 (terminal No. 2) and PCM 
connector B-21 (terminal No. 69).

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 11.
NO :  Repair it. Then go to Step 11.

1

2

AK303037

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-104

AB

B-104 (B)

THROTTLE
BODY

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-161

STEP 10. Check the engine coolant temperature sensor.

(1) Disconnect the engine coolant temperature sensor 

connector B-104.

(2) Remove the engine coolant temperature sensor.

(3) With the temperature sensing portion of engine coolant 

temperature sensor immersed in hot water, check 
resistance.

Standard value:

14 

− 17 kΩ [at −20°C (−4°F)]

5.1 

− 6.5 kΩ [at 0°C (32°F)]

2.1 

− 2.7 kΩ [at 20°C (68°F)]

0.9 

− 1.3 kΩ [at 40°C (104°F)]

0.48 

− 0.68 kΩ [at 60°C (140°F)]

0.26 

− 0.36 kΩ [at 80°C (176°F)]

(4) Apply 3M

 AAD part number 8731 or equivalent on the 

screw section of the engine coolant temperature sensor.

(5) Install the engine coolant temperature sensor, and tighten 

to the specified torque.

Tightening torque: 29 

± 10 N⋅m (22 ± 7 ft-lb)

Q: Is the measured resistance at the standard value?

YES : Replace the PCM. Then go to Step 11.
NO :  Replace the engine coolant temperature sensor. Then 

go to Step 11.

STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-6

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0118 set?

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

1

2

AK303037

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-104

AB

B-104 (B)

THROTTLE
BODY

AKX01622

AKX01623 AB

NEXT>>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-162

13B

DTC P0122: Throttle Position Sensor (Main) Circuit Low Input

CAUTION

If DTC P0122 has been set, TCL related DTC 
U1120 is also set. After P0122 has been diag-
nosed, don't forget to erase DTC U1120.

.

6

1 2 3 4 5

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

AK400878

YELLO

W

-RED

WHITE-RED

BLA

CK-WHITE

B-06

94

5

THROTTLE POSITION
SENSOR (MAIN)

HALL IC

POWERTRAIN 
CONTROL 
MODULE (PCM)

98

95

6

3

Throttle Position Sensor (main) Circuit

B-22

5 V

AK303042

THROTTLE BODY ASSEMBLY
(INCORPORATING THROTTLE
POSITION SENSOR)

B-06 (B)

CONNECTOR: B-06

AB

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-163

CIRCUIT OPERATION

• A 5-volt power supply is applied on the throttle 

position sensor (main) power terminal (terminal 
No. 5) from the PCM (terminal No. 94).
The ground terminal (terminal No. 3) is grounded 
with PCM (terminal No. 95).

.

TECHNICAL DESCRIPTION

• The throttle position sensor (main) outputs volt-

age which corresponds to the throttle valve open-
ing angle.

• The PCM checks whether the voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Throttle position sensor (main) output voltage is out 

of specified range.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.