Inspection Procedure
6: Cruise Control cannot be Set (No Response when the "COAST/SET" Switch and the "ACC/RES"
Switch is Pressed).
COMMENTS ON TROUBLE SYMPTOM
The fail-safe function is probably cancelling cruise control system. In this case, checking
the cruise control system, MPI system, CAN bus system and automated manual transmission system <Automated
manual transmission> diagnosis codes. The M.U.T.-III can also be used to check if the circuits
of each input switch are normal or not by checking the input switch codes.
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Press the cruise control switches one by one securely. Otherwise, the cruise control system
may not be started.
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PROBABLE CAUSES
- Malfunction of CAN bus system.
- Malfunction of the MPI system.
- Malfunction of the automated manual transmission system <Automated manual transmission>.
- Malfunction of the cruise control switch.
- Malfunction of the stop lamp switch.
- Malfunction of the clutch switch <M/T>.
- Malfunction of the engine-ECU <M/T>.
- Malfunction of the engine-A-M/T-ECU <Automated manual transmission>.
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- If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Before replacing the ECU, ensure that the CAN bus lines is normal.
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STEP 1. Check the CAN bus system diagnosis.
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Using M.U.T.-III, perform CAN bus diagnosis (Refer to GROUP 54C - Explanation
About The M.U.T-III Can Bus Diagnostics  ).
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Q.
Is the check result satisfactory?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus
Diagnostic Table ). Then go to Step 10.
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STEP 2. Check the MPI system diagnosis code.
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Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13B - Troubleshooting,
Diagnosis Function ) <135, 4A9> or (Refer
to GROUP 13C - Troubleshooting, Diagnosis Function ) <4G1>.
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Q.
Is any diagnosis code set?
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Repair the MPI system (Refer to GROUP 13B - Troubleshooting, Inspection
Chart for Diagnosis Trouble Code ) <135, 4A9> or
(Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <4G1>.
Then go to Step 10.
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Go to Step 4 <M/T>.
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Go to Step 3 <Automated manual transmission>.
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STEP 3. Check the automated manual transmission system diagnosis code <Automated
manual transmission>.
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Using M.U.T.-III, perform automated manual transmission system diagnosis code (Refer to
GROUP 22C - troubleshooting, Diagnostic Function ).
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Q.
Is any diagnosis code set?
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Repair the automated manual transmission system (Refer to GROUP 22C - troubleshooting,
Diagnosis Code Chart ). Then go to Step 10.
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Go to Step 4.
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STEP 4. Check the diagnosis code.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise
control system.
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(2)Connect the negative battery terminal.
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(3)With the cruise control switches not operated, depress the brake pedal for several seconds
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(4)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to
turn the cruise control system to ON (turn ON the cruise control indicator lamp).
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(5)After turning the cruise control system to ON, when 2 minutes or more has elapsed
without operating the cruise control switches, read the diagnosis code of the cruise control
system (Refer to ).
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Q.
Is any diagnosis code set?
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Repair the cruise control system (Refer to - Diagnosis
Code Chart). Then go to Step 10.
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Go to Step 5.
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STEP 5. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data
list reference table).
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- Item 75: "CANCEL" switch
- Item 86: "ON/OFF" switch
- Item 91: "ACC/RES" switch
- Item 92: "COAST/SET" switch
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Q.
Is the check result normal?
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Go to Step 6.
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Refer to - Diagnosis Code Procedures,
Code No. 15: Cruise control switch system. Then go to Step 10.
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STEP 6. Check the data list.
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Using M.U.T.-III, check the data list (Refer to data list reference table ).
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- Item 74: Stop lamp switch
- Item 89: Brake switch
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Q.
Is the check result normal?
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Go to Step 7 <M/T>.
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Go to Step 8 <Automated manual transmission>.
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Refer to - Diagnosis Code Procedures,
Code No. 22: Stop lamp switch system. Then go to Step 10.
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STEP 7. Check the data list <M/T>.
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Using M.U.T.-III, check the data list (Refer to - data
list reference table).
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Q.
Is the check result normal?
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Go to Step 9.
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Refer to - Symptom Procedures, Inspection
Procedure 2 <except AS&G> or Refer to - Symptom
Procedures, Inspection Procedure 3 <AS&G>. Then go to Step 10.
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STEP 8. Check the data list <Automated manual transmission>.
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Using M.U.T.-III, check the data list (Refer to - data
list reference table).
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the automated manual transmission system (Refer to GROUP 22C - troubleshooting,
Symptom Procedures, Inspection Procedure 6: Allshift lever system malfunction ).
Then go to Step 10.
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STEP 9. Check the symptoms.
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Q.
Can cruise control be set?
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
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Replace the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual
transmission> (Refer to GROUP 13B - Engine-ECU, engine-A-M/T-ECU ) <135,
4A9> or (Refer to GROUP 13C - Engine-ECU ) <4G1>.
When the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> is
replaced, register the encrypted code (Refer to GROUP 54A - Ignition Switch, Encrypted
Code Registration Criteria Table ). Then go to Step 10.
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STEP 10. Check the symptoms.
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Q.
Can cruise control be set?
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The procedure is complete.
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Return to Step 1.
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