Mitsubishi Grandis. Manual — part 729

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-167

Code No. P0340: Camshaft Position Sensor System

2

1

3

1

2

3

4

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

AK305562

Engine
control
relay

Camshaft
position
sensor

B-114
MU802337

71

5 V

1

1

2

2

3

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

Camshaft position sensor circuit

88

C-112
(MU803804)

14

12

J/C (4)

C-116

B-W

L-Y

B-W

11

4

J/C (4)

C-116

R-W

R-W

W-G

W-G

Battery

4

3

B-15X

AB

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

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-168

OPERATION

• Power is supplied to the camshaft position sensor

(terminal No. 3) from the engine control relay
(terminal No. 1) and is earthed to the engine-ECU
<M/T> or engine-A/T-ECU <A/T> (terminal No.
88) from the camshaft position sensor (terminal
No. 1).

• A power voltage of 5 V is applied to the camshaft

position sensor output terminal (terminal No. 2)
from the engine-ECU <M/T> or engine-A/T-ECU
<A/T> (terminal No. 71).

FUNCTION

• The camshaft position sensor detects the top

dead center on the compression stroke of the No.
1 cylinder and inputs a pulse signal to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.

TROUBLE JUDGMENT

Check Condition

• Engine speed is 50 r/min or higher.

Judgment Criterion

• Camshaft position sensor output voltage has not

been changed (no pulse signal is has been input)
for 2 seconds.

PROBABLE CAUSE

• Failed camshaft position sensor

• Open/short circuit in camshaft position sensor

circuit or loose connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-114 camshaft
position sensor connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Perform voltage measurement at B-114
camshaft position sensor connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Go to Step 3 .

STEP 3. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-169

YES :

Check intermediate connector C-116, and

repair if necessary. If intermediate
connector is normal, check and repair
harness between B-114 (terminal No. 3)
camshaft position sensor connector and
B-15X (terminal No. 1) engine control relay
connector.

• Check power supply line for

open/short circuit.

NO :

Repair or replace.

STEP 4. Perform voltage measurement at B-114
camshaft position sensor connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 2 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Go to Step 5 .

STEP 5. Perform voltage measurement at C-112
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

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

<A/T> terminal voltage.

• Disconnect B-114 camshaft position sensor

connector.

• Ignition switch: ON

• Voltage between terminal No. 71 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Go to Step 7 .

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-170

STEP 6. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Check and repair harness between B-114

(terminal No. 2) camshaft position sensor
connector and C-112 (terminal No. 71)
engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open circuit.

NO :

Repair or replace.

STEP 7. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair or replace.

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>