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

7 6 5 4 3

C-308

Harness side connector

Connector: C-308

AK305617

Connector: C-112

C-112 (GR)

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

6364

Power steering fluid pressure sensor circuit

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

Y-L

B-17*

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

J/C(4)
C-116

NOTE

*: R.H.drive vehicles

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-197

• 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

Connector: B-20

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

Connector: B-20

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)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

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