Mitsubishi Grandis. Manual - part 799

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-37

STEP 17. Connectors check: C-111 engine-ECU
connector <M/T> or C-111 engine-A/T-ECU
connector <A/T>, C-17 intermediate connector,
C-127 stop lamp switch connector

Q: Is the check result normal?

YES :

Go to Step 18.

NO :

Repair or replace the damaged
components. Then go to Step 23.

STEP 18. Check the harness between
engine-ECU connector C-111 <M/T> terminal
No.54 or engine-A/T-ECU connector C-111 <A/T>
terminal No.54 and stop lamp switch connector
C-127 terminal No.4.

Q: Is the check result normal?

YES :

Go to Step 19.

NO :

Repair the damaged harness wire. Then go
to Step 23.

STEP 19. Connectors check: C-127 stop lamp
switch connector, C-01 J/C (6)

Q: Is the check result normal?

YES :

Go to Step 20.

NO :

Repair or replace the damaged
components. Then go to Step 23.

AC311909AB

C-111 (GR)

Connector: C-111

AC311915AD

Connector: C-17

C-17

AC311916

Connector: C-127

C-127

AC311909AB

C-111 (GR)

Connector: C-111

AC311916

Connector: C-127

C-127

AC311916

Connectors: C-01, C-127

C-127

C-01

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-38

STEP 20. Check the harness between stop lamp
switch connector C-127 terminal No.3 and earth.

Q: Is the check result normal?

YES :

Go to Step 21.

NO :

Repair the damaged harness wire. Then go
to Step 23.

STEP 21. MUT-III data list

Item 06: Brake switch (Refer to data list reference
table

P.17-50

Q: Is the check result normal?

YES :

Go to Step 22.

NO :

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T> (Refer to GROUP
13A, Engine-ECU and Engine-A/T-ECU

P.13A-399

). Then go to Step 23 .

STEP 22. Check the MUT-III diagnosis code No.
22.

Q: Is the MUT-III diagnosis code No. 22 output?

YES :

Replace the engine-ECU <M/T> or

engine-A/T-ECU <A/T> (Refer to GROUP
13A, Engine-ECU and Engine-A/T-ECU

P.13A-399

). Then go to Step 23 .

NO :

It can be assumed that this malfunction is
intermittent.

STEP 23. Check the MUT-III diagnosis code No.
22.

Q: Is the MUT-III diagnosis code No. 22 output?

YES :

Return to Step 1.

NO :

The procedure is complete.

Code No. 23 Engine-ECU <M/T> or engine-A/T-ECU <A/T> and its related components

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set when there is an failure in
the engine-ECU <M/T> or engine-A/T-ECU <A/T>
and its related components.

PROBABLE CAUSE

• Malfunction of the MPI system.

• Malfunction of the A/T system.

• Malfunction of the engine-ECU <M/T>.

• Malfunction of the engine-A/T-ECU <A/T>.

DIAGNOSIS

STEP 1. Check the MPI system diagnosis code.

Q: Is any diagnosis code set?

YES :

Repair the MPI control system. (Refer to

GROUP 13A, Troubleshooting

− Inspection

chart for diagnosis codeTrouble Code Chart

P.13A-20

). Then go to Step 4.

NO <M/T> :

Go to Step 3.

NO <A/T> :

Go to Step 2.

AC311916

Connector: C-127

C-127

AC302155

Ground terminal

AC302156

Ground terminal

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-39

STEP 2. Check the A/T system diagnosis code.

Q: Is any diagnosis code set?

YES :

Repair the A/T system (Refer to GROUP

23A, Troubleshooting <A/T>

− Check chart

for diagnosis codes

P.23A-17

). Then go to

Step 4.

NO :

Go to Step 3.

STEP 3. Check the MUT-III diagnosis code No. 23.

Q: Is the MUT-III diagnosis code No. 23 output?

YES :

Replace the engine-ECU <M/T> or

engine-A/T-ECU <A/T> (Refer to GROUP
13A, Engine-ECU and
Engine-A/T-ECU

P.13A-399

). Then go to

Step 4.

NO :

This malfunction is intermittent. (Refer to
GROUP 00 - How to Use
Troubleshooting/Inspection Service Points

P.00-5

STEP 4. Check the MUT-III diagnosis code No. 23.

Q: Is the MUT-III diagnosis code No. 23 output?

YES :

Return to Step 1 .

NO :

This procedure is complete.

CHECK CHART FOR TROUBLE
SYMPTOMS

M1172002300430

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the Brake Pedal is Depressed, Auto-cruise Control is not
Cancelled.

COMMENTS ON TROUBLE SYMPTOM

The stop lamp switch circuit is suspected.

PROBABLE CAUSE

• Malfunction of the connector.

• Malfunction of the harness.

Trouble symptom

Inspection
procedure No.

Reference page

Communication with
MUT-III is not
possible.

Communication with the engine-ECU
<M/T> or engine-A/T-ECU <A/T> only is
impossible

Group 13A,
Symptom
Procedures

−

Inspection
Procedure 1

P.13A-283

Auto-cruise control
is not cancelled.

Even if brake pedal is depressed

P.17-39

Even if clutch pedal is depressed <M/T>

P.17-40

Even if select lever is set to N range <A/T> 3

P.17-46

Even if auto-cruise control CANCEL switch
in set to ON

P.17-47

Auto-cruise control cannot be set.

P.17-47

Hunting (repeated acceleration and deceleration) occurs at the
set vehicle speed. <M/T>

P.17-48

Hunting (repeated acceleration and deceleration) occurs at the
set vehicle speed. <A/T>

P.17-48

When the auto-cruise control MAIN switch is turned ON, the
auto-cruise control indicator lamp does not illuminate. (However,
the auto-cruise control system is normal).

P.17-49

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-40

• Malfunction of the stop lamp switch.

• Malfunction of the engine-ECU <M/T>.

• Malfunction of the engine-A/T-ECU <A/T>.

DIAGNOSIS

Refer to

P.17-21

<L.H. drive vehicles>,

P.17-30

<R.H. drive vehicles>, Diagnosis Trouble Code
Procedures

− Code No. 22: Stop lamp switch

system.

INSPECTION PROCEDURE 2: When the Clutch Pedal is Depressed, Auto-cruise Control is not
Cancelled <M/T>.

OPERATION

This circuit indicates the operation status of the
clutch pedal position switch. When the clutch switch
is ON (clutch pedal is depressed), the voltage of
engine-ECU terminal number 40 will indicate 0 volt.

COMMENTS ON TROUBLE SYMPTOM

The cause is probably a malfunction of the clutch
switch circuit.

POSSIBLE CAUSES

• Malfunction of the clutch switch.

Clutch switch circuit

AC311468

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

Clutch switch

J/C (7)

Engine-ECU

B-P

C-01

C-32

J/C (6)

C-131

C-111

C-17

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

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