Mitsubishi Grandis. Manual — part 736

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-195

STEP 2. Check harness between C-308 (terminal
No. 7) immobilizer-ECU connector and C-112
(terminal No. 65) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connector C-17, and repair if necessary.

• Check output line for open/short circuit and

damage.

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair.

STEP 3. Check the trouble symptoms.

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

STEP 4. After replacing the immobilizer-ECU,
re-check the trouble symptoms.

Q: Is the check result normal?

YES :

Replace engine-ECU <M/T> or

engine-A/T-ECU <A/T>.

NO :

Check end.

AK305621

2

7 6 5 4 3

1

AB

C-308

Harness side connector

Connector: C-308

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-196

Code No. P0551: Power Steering Fluid Pressure Sensor System

CONDITION

• A power voltage of 5 V is applied to power

steering fluid pressure sensor (terminal No. 3)
from the engine-ECU <M/T> or engine-A/T-ECU
<A/T> (terminal No. 97).

• The power voltage is earthed to the engine-ECU

<M/T> or engine-A/T-ECU <A/T> (terminal No.
96) from the power steering fluid pressure sensor
(terminal No. 1).

• The sensor signal is inputted to the engine-ECU

<M/T> or engine-A/T-ECU <A/T> (terminal No.
84) from power steering fluid pressure sensor
output terminal (terminal No. 2).

FUNCTION

• Detect the power steering oil pump load caused

by the steering and input it into engine-ECU
<M/T> or engine-A/T-ECU <A/T>. engine-ECU
<M/T> or engine-A/T-ECU <A/T> determines the
power steering oil pump load through power
steering fluid pressure sensor to perform the idle
up control depending on the load.

TROUBLE JUDGMENT

Check Condition

• All the time after the microcomputer start.

Judgment Criteria

• Power steering fluid pressure sensor output

voltage has continued to be 4.8 V or more for 5
seconds.

AK305567

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

3

2

1

AB

Power steering fluid pressure sensor circuit

Engine-ECU <M/T> or
engine-A/T-ECU <A/T>

2

3

1

BR

BR

BR

Y

Y-L

Y

Y-L

B-17*

4

1

6

84

97

5V

96

Power steering fluid
pressure sensor

C-112

(MU803804)

B-20

(MU802406)

C-113

(MU803805)

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

29

33

J/C(4)
C-116

NOTE

*: R.H.drive vehicles

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-197

or

• Power steering fluid pressure sensor output

voltage has continued to be 0.2 V or less for 5
seconds.

PROBABLE CAUSE

• Failed power steering fluid pressure sensor

• Failed power steering

• Open/short circuit in power steering fluid

pressure sensor circuit or loose contact.

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III data list

• Refer to Data List Reference Table

P.13A-363

a. Item B4: Power steering fluid pressure sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to

GROUP00

− How to Use

Troubleshooting/Inspection Service
Points

P.00-5

)

NO :

Go to Step 2 .

STEP 2. Check for stationary steering effort
(Refer to

P.37-10

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair.

STEP 3. Connector check: B-20 power steering
fluid pressure sensor connector

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair or replace.

AK305622

1

2

3

AB

Connector: B-20

B-20 (B)

B-20 (B)

Harness side
connector

<L.H. drive vehicles>

<R.H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-198

STEP 4. Perform voltage measurement at B-20
power steering fluid pressure sensor connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: 4.9

− 5.1V

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Go to Step 5 .

STEP 5. Perform voltage measurement at C-113
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Measure engine-ECU <M/T> connector or

engine-A/T-ECU <A/T> terminal voltage.

• Ignition switch: ON

• Voltage between terminal No.97 and earth.

OK: 4.9

− 5.1V

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Go to Step 7

AK305622

1

2

3

AB

Connector: B-20

B-20 (B)

B-20 (B)

Harness side
connector

<L.H. drive vehicles>

<R.H. drive vehicles>

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector