Mitsubishi Grandis. Manual - part 801

 

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Mitsubishi Grandis. Manual - part 801

 

 

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-45

STEP 4. Check the harness between clutch 
switch connector C-131 terminal No.1 and 
engine-ECU connector C-111 terminal No.40.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the harness wire and then check that 
the malfunction is eliminated.

STEP 5. Connector check: C-32 J/C (7) <LHD> or 
C-01 J/C (6) <RHD>

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the faulty connector. Then 
check that the malfunction is eliminated.

AC311284AE

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

AC311913AG

C-131

Connector: C-131
<L.H. drive vehicles>

AC311916AG

C-131

Connector: C-131
<R.H. drive vehicles>

AC311913AE

C-32

Connector: C-32
<L.H. drive vehicles>

AC311916AE

C-01

Connector: C-01
<R.H. drive vehicles>

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-46

STEP 6. Check the harness between clutch 
switch connector C-131 terminal No.2 and J/C (7) 
C-32 terminal No.21 <LHD> or J/C (6) C-01 
terminal No.26 <RHD>.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the harness wire and then check that 
the malfunction is eliminated.

STEP 7. Check the harness between J/C (7) C-32 
terminal No.22 <LHD> or J/C (6) C-01 terminal 
No.33 <RHD> and earth.

Q: Is the check result normal?

YES : 

Check that the malfunction is eliminated. If 

the malfunction is eliminated, replace the 
engine-ECU (Refer to GROUP 13A, 
Engine-ECU and Engine-A/T-ECU 

P.13A-399

). Then check that the 

malfunction is eliminated.

NO : 

Repair the harness wire and then check that 
the malfunction is eliminated.

INSPECTION PROCEDURE 3: When the Selector Lever is Moved to "N" Range, Auto-cruise Control is 
not Cancelled <A/T>.

COMMENTS ON TROUBLE SYMPTOM

The inhibitor switch circuit is suspected.

PROBABLE CAUSE

• Malfunction of the inhibitor switch.

• Malfunction of the connector.

• Malfunction of the harness.

• Malfunction of the engine-A/T-ECU.

DIAGNOSIS

Refer to GROUP 23A, Diagnostic Trouble Code 
Procedures 

− Code No. 27: Inhibitor switch system 

(Open Circuit) 

P.23A-52

, diagnosis code 28: Inhibitor 

switch system (Short Circuit) 

P.23A-59

.

AC311913AF

C-32

C-32

C-131

C-131

Connectors: C-32, C-131
<L.H. drive vehicles>

AC311916AF

C-01

C-01

C-131

C-131

Connectors: C-01, C-131
<R.H. drive vehicles>

AC311913AE

C-32

Connector: C-32
<L.H. drive vehicles>

AC311916AE

C-01

Connector: C-01
<R.H. drive vehicles>

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-47

INSPECTION PROCEDURE 4: When the Auto-cruise Control "CANCEL" Switch is Set to ON, 
Auto-cruise Control is not Cancelled.

COMMENTS ON TROUBLE SYMPTOM

The cause is probably an open-circuit in the circuit 
inside the auto-cruise control CANCEL switch.

PROBABLE CAUSE

Malfunction of the auto-cruise control switch.

DIAGNOSIS

Replace the auto-cruise control switch (Refer to 

P.17-56

). Then check the malfunction is eliminated.

INSPECTION PROCEDURE 5: Auto-cruise Control cannot be Set.

COMMENTS ON TROUBLE SYMPTOM

The fail-safe function is probably cancelling 
auto-cruise control. In this case, MUT-III can be used 
to Retest each system by checking the diagnosis 
trouble codes. The MUT-III can also be used to 
check if the circuits of each input switch are normal 
or not by checking the input switch codes. 

PROBABLE CAUSE

• Malfunction of the auto-cruise control switch.

• Malfunction of the stop lamp switch.

• Malfunction of the inhibitor switch.

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

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

DIAGNOSIS

STEP 1. Check the MUT-III diagnosis code

Q: Is any diagnosis code set?

YES : 

Refer to 

P.17-6

, Check Chart for Diagnosis 

Codes . Then go to Step 6.

NO : 

Go to Step 2.

STEP 2. MUT-III data list
Item 04: Cancel switch (Refer to data list reference 
table 

P.17-50

).

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to 

P.17-47

, Symptom Procedures 

number 4. Then go to Step 6.

STEP 3. MUT-III data list

• Item 05: Stop lamp switch (Refer to data list 

reference table 

P.17-50

).

• Item 06: Brake switch (Refer to data list 

reference table 

P.17-50

).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to 

P.17-39

, Symptom Procedures 

number 1. Then go to Step 6.

STEP 4. MUT-III data list

• Item 07, Clutch switch <M/T> (Refer to data 

list reference table 

P.17-50

).

• Item 07, Inhibitor switch <A/T> (Refer to data 

list reference table 

P.17-50

).

Q: Is the check result normal?

YES : 

Go to Step 5

NO <M/T> : 

Refer to 

P.17-40

, Symptom 

Procedures number 2. Then go to Step 6

NO <A/T> : 

Refer to 

P.17-46

, Symptom 

Procedures number 3. Then go to Step 6

STEP 5. Check the symptoms.

Q: Can auto-cruise control be set?

YES : 

It can be assumed that this malfunction is 

intermittent.

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 6.

STEP 6. Check the symptoms.

Q: Can auto-cruise control be set?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-48

INSPECTION PROCEDURE 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set 
Vehicle Speed <M/T>.

COMMENTS ON TROUBLE SYMPTOM

The vehicle speed sensor or the throttle body is 
suspected.

PROBABLE CAUSE

• Malfunction of the vehicle speed sensor.

• Malfunction of the throttle body.

• Malfunction of the engine-ECU.

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 code 

P.13A-20

). Then go 

to Step 3.

NO : 

Go to Step 2.

STEP 2. Retest the system

Q: Does a hunting occur?

YES : 

Replace the engine-ECU (Refer to GROUP 

13A, Engine-ECU and Engine-A/T-ECU 

P.13A-399

). Then go to Step 3.

NO : 

It can be assumed that this malfunction is 
intermittent.

STEP 3. Retest the system

Q: Does a hunting occur?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 7: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set 
Vehicle Speed <A/T>.

COMMENTS ON TROUBLE SYMPTOM

The output shaft speed sensor signal or the throttle 
body is suspected.

PROBABLE CAUSE

• Malfunction of the output shaft speed sensor.

• Malfunction of the throttle body.

• Malfunction of the engine-A/T-ECU.

DIAGNOSIS

STEP 1. 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 2.

STEP 2. 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 code 

P.13A-20

). Then go 

to Step 4.

NO : 

Go to Step 3.

STEP 3. Retest the system

Q: Does a hunting occur?

YES : 

Replace the engine-A/T-ECU (Refer to 

GROUP 13A, Engine-ECU and 
Engine-A/T-ECU

P.13A-399

). Then go to 

Step 4.

NO : 

It can be assumed that this malfunction is 
intermittent.

STEP 4. Retest the system

Q: Does a hunting occur?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

 

 

 

 

 

 

 

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