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
). 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)
, diagnosis code 28: Inhibitor
switch system (Short Circuit)
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
). 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
, 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
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to
, 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
• Item 06: Brake switch (Refer to data list
reference table
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Refer to
, 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
).
• Item 07, Inhibitor switch <A/T> (Refer to data
list reference table
).
Q: Is the check result normal?
YES :
Go to Step 5
NO <M/T> :
Refer to
Procedures number 2. Then go to Step 6
NO <A/T> :
Refer to
, 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
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
). 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
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
). 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
). 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
). 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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