Inspection Procedure
4: 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, MPI 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 MPI system.
- Malfunction of the A/T system.
- Malfunction of the ASTC system.
- Malfunction of the cruise control switches.
- Malfunction of the stop lamp switch.
- Malfunction of the inhibitor switch.
- Malfunction of the engine-ECU.
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caution |
- 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 ).
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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 Code ). Then go to Step 10.
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Go to Step 3.
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STEP 3. Check the A/T system diagnosis code.
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Using M.U.T.-III, perform A/T system diagnosis code (Refer to GROUP 23A - Troubleshooting <A/T>,
Diagnosis Function ).
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Q.
Is any diagnosis code set?
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Repair the A/T system (Refer to GROUP 23A - Troubleshooting <A/T>,
Inspection Chart for Diagnosis Code ). Then go to Step 10.
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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 (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>,
Diagnosis Function ).
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Q.
Is any diagnosis code set?
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Repair the ASTC system (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>,
Diagnosis Code Chart ). Then go to Step 10.
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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 10.
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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 (Refer to data list reference table ).
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- Item 75: CANCEL switch
- Item 86: Cruise control ON/OFF switch
- Item 91: RES + switch
- Item 92: SET - 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 10.
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STEP 7. 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 8.
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Refer to - Diagnosis Code Procedures,
Code No.P1571: Stop lamp switch system. Then go to Step 10.
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STEP 8. Check the A/T system data list.
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Using M.U.T.-III, check the data list (Refer to GROUP 23A - Data List Reference
Table ).
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- Item 24: Inhibitor switch: P
- Item 25: Inhibitor switch: R
- Item 26: Inhibitor switch: N
- Item 27: Inhibitor switch: D
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Q.
Is the check result normal?
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Go to Step 9.
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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) ].
Then go to Step 10.
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STEP 9. 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 13B - Engine-ECU ).
Then go to Step 10.
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STEP 10. 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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