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, checking
the auto-cruise control system and diesel fuel system and A/T system diagnostic trouble
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 auto-cruise control switches one by one securely. Otherwise, the auto-cruise
control system may not be started.
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PROBABLE CAUSE
- Malfunction of the auto-cruise control switch.
- Malfunction of the stop lamp switch.
- Malfunction of the clutch switch <M/T>.
- Malfunction of the inhibitor switch <A/T>.
- Malfunction of the diesel fuel system.
- Malfunction of the A/T system <A/T>.
- Malfunction of the A/T-ECU <A/T>.
- Malfunction of the engine-ECU.
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STEP 1. M.U.T.-III data list.
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- Item 136: "ON/OFF" (MAIN) switch
- Item 137: "CANCEL" switch
- Item 138: "COAST/SET" switch
- Item 139: "ACC/RES" switch
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(Refer to data list reference table ).
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Q.
Is the check result normal?
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Go to Step 2.
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Check the auto-cruise control switch system (Refer to - Diagnosis
Code Procedures, Code No. P1564: Auto-cruise control switch system). Then go to Step 9.
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STEP 2. M.U.T.-III data list.
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- Item 135: Stop lamp switch
- Item 134: Brake switch
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(Refer to data list reference table ).
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Q.
Is the check result normal?
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Go to Step 3 <M/T>.
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Go to Step 4 <A/T>.
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Check the auto-cruise control switch system (Refer to - Diagnosis
Code Procedures, Code No. P1571: Stop lamp switch system). Then go to Step 9.
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STEP 3. M.U.T.-III data list <M/T>.
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Item 131: Clutch switch (Refer to data list reference table ).
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Q.
Is the check result normal?
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Go to Step 4.
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Check the clutch switch system (Refer to - Inspection
Procedure 2). Then go to Step 9.
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STEP 4. A/T system M.U.T.-III data list <A/T>.
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Item 34: Inhibitor switch (Refer to GROUP 23A - Troubleshooting A/T, Data List
Reference Table ).
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Q.
Is the check result normal?
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Go to Step 5.
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Check the inhibitor switch system [Refer to GROUP 23A - Troubleshooting <A/T>,
Diagnosis Code Procedures, DTC P1770: Inhibitor switch system (Open Circuit) ,
DTC P1771: Inhibitor switch system (Short Circuit) ].
Then go to Step 9.
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STEP 5. Check the diesel fuel system diagnosis code.
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Refer to GROUP 13D - Troubleshooting, Diagnosis Function .
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Q.
Is any diagnosis code set?
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Repair the diesel fuel system. (Refer to GROUP 13D - Troubleshooting,
Inspection Chart for Diagnosis Trouble Code ). Then go to Step
9.
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Go to Step 7 <M/T>.
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Go to Step 6 <A/T>.
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STEP 6. Check the A/T system diagnosis code <A/T>.
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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>,
Diagnosis Code Chart ). Then go to Step 9.
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Go to Step 7.
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STEP 7. Read the diagnosis code.
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(1)Disconnect the negative (-) battery terminal, and erase the diagnosis
code of the auto-cruise control system.
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(2)Connect the negative (-) battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF"
(MAIN) switch to turn the auto-cruise control system to ON.
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(4)Read the diagnosis code of the auto-cruise control system.
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Q.
Is any diagnosis code set?
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Diagnose the auto-cruise control system (Refer to - Diagnosis
Code Chart). Then go to Step 9.
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Go to Step 8.
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STEP 8. Check the symptoms.
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Q.
Can auto-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 13D - Engine-ECU ).
Then go to Step 9.
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STEP 9. Check the symptoms.
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Q.
Can auto-cruise control be set?
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The procedure is complete.
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Return to Step 1.
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