Inspection Procedure
5: Cruise Control cannot be Set (No Response SET - Switch and 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, diesel fuel system, ASTC system, CAN bus system and A/T
system 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 data list.
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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 diesel fuel system.
- Malfunction of the ASTC system.
- Malfunction of the A/T system <A/T>.
- Malfunction of the cruise control switches.
- Malfunction of the stop lamp switch.
- Malfunction of the clutch switch <M/T>.
- Malfunction of the inhibitor switch <A/T>.
- Malfunction of the engine-ECU.
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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 11.
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STEP 2. Check the diesel fuel system diagnosis code.
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Using M.U.T.-III, perform diesel fuel system diagnosis code (Refer to GROUP 13C - Troubleshooting,
Diagnosis Function <4N1>, GROUP 13E - Troubleshooting,
Diagnosis Function <4D5>).
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Q.
Is any diagnosis code set?
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Repair the diesel fuel system (Refer to GROUP 13C - Troubleshooting,
Inspection Chart for Diagnosis Trouble Code <4N1>,
GROUP 13E - Troubleshooting, Inspection Chart for Diagnosis Trouble Code <4D5>).
Then go to Step 11.
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Go to Step 3.
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STEP 3. Check the A/T system diagnosis code <A/T>.
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Using M.U.T.-III, perform A/T system diagnosis code (Refer to GROUP 23A - Troubleshooting,
Diagnosis Function <8A/T>, GROUP 23C - Troubleshooting, Diagnosis
Function <5A/T>).
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Q.
Is any diagnosis code set?
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Repair the A/T system (Refer to GROUP 23A - Troubleshooting,
Diagnosis Code Chart <8A/T>, GROUP 23C - Troubleshooting, Diagnosis
Code Chart <5A/T>). Then go to Step
11.
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Go to Step 4.
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STEP 4. Check the ASTC system diagnosis code.
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Using M.U.T.-III, perform ASTC system diagnosis code.
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Q.
Is any diagnosis code set?
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Repair the ASTC system (Refer to GROUP 35C - Troubleshooting, Diagnosis
Code Chart ). Then go to Step 11.
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Go to Step 5.
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STEP 5. Check the diagnosis code.
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(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
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(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF
switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp).
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(3)After turning the cruise control system to ON, when 2 minutes or more has elapsed
without operating the cruise control switches.
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(4)With the cruise control switches not operated, depress the brake pedal for several
seconds, and then read the diagnosis code of the cruise control system.
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Q.
Is any diagnosis code set?
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Repair the cruise control system. Then go to Step 11.
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Go to Step 6.
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STEP 6. Check the data list.
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Using M.U.T.-III, check the data list.
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- Item 136: Cruise main switch.
- Item 137: Cruise cancel switch.
- Item 138: Cruise set switch.
- Item 139: Cruise resume switch.
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Q.
Is the check result normal?
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Go to Step 7.
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Refer to - Diagnosis Code Procedures, Code
No.P1564: Cruise control switch system. Then go to Step 11.
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STEP 7. Check the data list.
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Using M.U.T.-III, check the data list.
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- Item 134: Normally closed brake switch.
- Item 135: Brake lamp switch.
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Q.
Is the check result normal?
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Go to Step 8 <M/T>
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Go to Step 9 <A/T>
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Refer to - Diagnosis Code Procedures, Code
No.P1571: Stop lamp switch system. Then go to Step 11.
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STEP 8. Check the data list. <M/T>
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Using M.U.T.-III, check the data list.
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- Item 131: MT clutch switch.
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Q.
Is the check result normal?
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Go to Step 10.
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Refer to - Symptom Procedures, Inspection
Procedure 2. Then go to Step 11.
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STEP 9. Check the data list <A/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 10.
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Check the inhibitor switch system [Refer to GROUP 23A - Troubleshooting,
Diagnosis Code Procedures Code No. P0707: Inhibitor Switch System (Open Circuit), Code No. P0708:
Inhibitor Switch System (Short Circuit) <8A/T>, GROUP 23C - Troubleshooting,
Diagnosis Code Procedures Code No. P0707: Inhibitor Switch System (Open Circuit) ,
Code No. P0708: Inhibitor Switch System (Short Circuit) <5A/T>].
Then go to Step 11.
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STEP 10. Check the symptom.
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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 (Refer to GROUP 13C - Engine-ECU <4N1>,
GROUP 13E - Engine-ECU <4D5>).
Then go to Step 11.
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STEP 11. Check the symptom.
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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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