Mitsubishi Grandis. Manual — part 726

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-155

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-24 detonation
sensor connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Perform resistance measurement at B-24
detonation sensor connector.

• Disconnect connector, and measure at harness

side.

• Resistance between terminal No. 2 and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Check and repair harness between B-24

(terminal No. 2) detonation sensor
connector and body earth.

• Check earthing line for open circuit

and damage.

STEP 3. 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 4 .

NO :

Repair or replace.

AK304266

1

2

AC

Connector: B-24

B-24 (GR)

Harness
side connector

Detonation sensor

AK304266

1

2

AC

Connector: B-24

B-24 (GR)

Harness
side connector

Detonation sensor

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-156

STEP 4. Check harness between B-24 (terminal
No. 1) detonation sensor connector and C-112
(terminal No. 89) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open/short circuit and

damage.

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair.

STEP 5. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Go to Step 6 .

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

STEP 6. Replace detonation sensor.

• After replacing the detonation sensor, re-check

the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU <M/T> or

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

NO :

Check end.

AK304266

1

2

AC

Connector: B-24

B-24 (GR)

Harness
side connector

Detonation sensor

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-157

Code No. P0335: Crank Angle Sensor System

1

2

3

4

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

1 2 3

AK305561

1

2 3

Engine
control
relay

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

Crank
angle
sensor

70

1

3

3

2

2

2

1

1

5 V

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

Crank angle sensor circuit

88

13

12

J/C (4)

C-116

B-121

B-121-1

W-G

B-W

B-W

G-R

3

11

J/C (4)

C-116

R-W

R-W

W-G

Battery

4

3

B-15X

C-112

(MU803804)

B-121

(MU802064)

AB

B-121-1

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-158

OPERATION

• Power is supplied to the crank angle sensor

(terminal No. 1) 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 crank angle sensor (terminal No. 3).

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

angle sensor output terminal (terminal No. 2)
from the engine-ECU <M/T> or engine-A/T-ECU
<A/T> (terminal No. 70).

FUNCTION

• The crank angle sensor detects the crank angle

(position) and inputs a pulse signal to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.

• In response to the signal, the engine-ECU <M/T>

or engine-A/T-ECU <A/T> controls the injector,
etc.

TROUBLE JUDGMENT

Check Conditions

• While engine is cranking.

Judgment Criteria

• Crank angle sensor output voltage has not been

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

PROBABLE CAUSE

• Failed crank angle sensor

• Open/short circuit in crank angle sensor circuit or

loose connector 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 22: Crank angle sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

Go to Step 2 .

STEP 2. Connector check: B-121 crank angle
sensor intermediate connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace.

STEP 3. Perform voltage measurement at B-121
crank angle sensor intermediate 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 9 .

NO :

Go to Step 4 .

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector