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