Mitsubishi Grandis. Manual — part 735

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-191

STEP 4.Check harness between C-112 (terminal
No. 79) engine-ECU connector and B-107-1
(terminal No. 3) Vehicle speed sensor connector.

NOTE: Before checking harness, check intermediate
connector B-107, and repair if necessary.

• Check output line for open 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 :

Replacing engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00 - How to Use Troubleshooting/Inspection
Service Points

P.00-5

).

Code No. P0500: Vehicle Speed Signal System <A/T>

FUNCTION

• Receives the signal from the secondary speed

sensor used for the A/T control and converts it to
the vehicle speed signal, and then inputs it to the
engine control system and the speedometer.

TROUBLE JUDGMENT

Check Conditions

• After 2 seconds pass from when the engine has

completed the starting.

• The engine rpm is 2500 − 4000 r/min.

• Under the high load operation.

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK305620

1

2

3

AB

B-107-1 (B)

Connector: B-107-1

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-192

Judgment Criterion

• The sensor output voltage does not vary for 4

seconds. (The pulse signal is not input.)

PROBABLE CAUSE

• Malfunction in the secondary speed sensor

• Open circuit, short or damage in the secondary

speed sensor circuits or connection failure of the
connector

• Malfunction in engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-III other system diagnosis codes

Q: Is the diagnosis code output for A/T system?

YES :

A/T system check (Refer to GROUP

23-DIAGNOSIS CODE CLASSIFIED
TABLE

P.23A-17

.)

NO :

Go to STEP 2.

STEP 2. MUT-III diagnosis code

• Reconfirmation of the diagnosis code.

Q: Is the diagnosis code output?

YES :

Replacement of Engine-A/T-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

Code No. P0505: Idle Speed Control (ISC) System

FUNCTION

• The amount of air taken in during idling is

regulated by the opening and closing of the
throttle valve.

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

<A/T> checks the difference between the actual
engine speed and the target engine speed.

TROUBLE JUDGMENT

Check Conditions

• The vehicle speed has reached 1.5 km/h or more

at least once.

• During the closed-loop idle speed control.

Judgment Criterion

• The actual idle speed is higher than the target

idle speed by 300 r/min or more for 10 seconds.

Check Conditions

• The vehicle speed has reached 1.5 km/h or more

at least once.

• During the closed-loop idle speed control.

• The highest ambient temperature at the last drive

is 45

°C or less.

• The engine coolant temperature is approx. 77°C

or higher.

• The battery voltage is 10 V or more.

• The intake air temperature is -10°C or higher.

Judgment Criterion

• The actual idle speed is higher than the target

idle speed by 200 r/min or more for 10 seconds.

Check Conditions

• During the closed-loop idle speed control

• The engine coolant temperature is approx. 77°C

or higher.

• The battery voltage is 10 V or more.

• The power steering switch is in OFF position.

• The charging efficiency is 40 % or less.

• The intake air temperature is -10°C or higher.

Judgment Criterion

• The actual idle speed is lower than the target idle

speed by 100 r/min or more for 10 seconds.

PROBABLE CAUSE

• Throttle valve area is dirty.

• Intake system vacuum leak.

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

STEP 1: MUT-III diagnosis code

Q: Diagnosis code set?

YES :

Inspection chart for diagnosis code (Refer

to

P.13A-20

.)

NO :

Go to Step 2 .

STEP 2: Check throttle body (throttle valve
portion) for contamination.

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Clean throttle body (throttle valve portion)
(Refer to

P.13A-383

).

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-193

STEP 3. Check air intake from intake hose and
inlet manifold.

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair.

STEP 4. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU <M/T> or

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

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

Code No. P0513: Immobilizer Malfunction

OPERATION

• The signals are sent and received between

engine-ECU <M/T> or engine-A/T-ECU <A/T>
(terminal No. 65) and immobilizer-ECU (terminal
No. 7).

FUNCTION

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

sends or receives the control signals to or from
immobilizer-ECU to certify the ignition key.

NOTE:

.

•

If the registered ignition keys are close each
other when starting the engine, radio
interference may cause this code to be
displayed.

•

This code may be displayed when registering
the key encrypted code.

AK305566

1

2

3 4 5 6 7

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

65

7

16

C-308

MU801547

C-17

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

Immobilizer-ECU circuit

Immobilizer-ECU

AB

W-V

W-V

C-112

(MU803804)

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-194

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgment Criterion

• When the communication error between

engine-ECU <M/T> or engine-A/T-ECU <A/T>
and the immobilizer-ECU continues for 2 seconds
or more.

PROBABLE CAUSE

• Open/short circuit in immobilizer system circuit or

loose connector contact

• Failed immobilizer-ECU

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-308
immobilizer-ECU connector and 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 2 .

NO :

Repair or replace.

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>