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Inspection Procedure 5

Inspection Procedure 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.

COMMENT
The secondary pulley speed sensor signal (vehicle speed signal) [2.4L Engine], output shaft speed sensor signal (vehicle speed signal) [3.0L Engine], or the throttle body is suspected.

NOTE: When the vehicle is driven with the low-speed gear in the sport mode, hunting occurs easily, however, this is not a failure.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of the CAN bus line system.
- Malfunction of the secondary pulley speed sensor [2.4L Engine].
- Malfunction of the output shaft speed sensor [3.0L Engine].
- Malfunction of the CVT system [2.4L Engine].
- Malfunction of the A/T system [3.0L Engine].
- Malfunction of the throttle body.
- Malfunction of the ECM.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

CAUTION:
- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble 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.

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. How to Diagnose the CAN Bus Line
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the check result satisfactory?

YES : Go to Step 2 [2.4L Engine].

YES : Go to Step 3 [3.0L Engine].

NO : Repair the CAN bus lines (Refer to Controller Area Network, Diagnosis - CAN Bus Diagnostics Chart). Then go to Step 7.

STEP 2. Using scan tool MB991958, read the CVT system diagnostic trouble code [2.4L Engine].

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for CVT system diagnostic trouble code (Refer to Continuously Variable Transaxle, Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Code).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES : Diagnose the CVT system (Refer to Continuously Variable Transaxle, Diagnosis - Diagnostic Trouble Code Chart). Then go to Step 7.

NO : Go to Step 4.

STEP 3. Using scan tool MB991958, read the A/T system diagnostic trouble code [3.0L Engine].

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for A/T system diagnostic trouble code (Refer to A/T, Automatic Transaxle Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Codes).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES : Diagnose the A/T system (Refer to A/T, Automatic Transaxle Diagnosis - Diagnostic Trouble Code Chart). Then go to Step 7.

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, read the MFI system diagnostic trouble code.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system diagnostic trouble code (Refer to Diagnostic Function - How to Read and Erase Diagnostic Trouble Codes) [2.4L Engine] or (Refer to Diagnostic Function - How to Read and Erase Diagnostic Trouble Codes) [3.0L Engine]. With Manufacturer's Scan Tool
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES : Diagnose the MFI system (Refer to Diagnostic Trouble Code Chart) [2.4L Engine] or (Refer to Diagnostic Trouble Code Chart) [3.0L Engine] Diagnostic Trouble Code Descriptions. Then go to Step 7.

NO : Go to Step 5.

STEP 5. Using scan tool MB991958, check the data list item 87: Neutral switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 4, Vehicle speed signal.
- When road test the vehicles, check the display on scan tool MB991958 and speedometer.

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the display on scan tool MB991958 and speedometer same value?

YES : Go to Step 6.

NO : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 7.

STEP 6. Retest the system

Q: Does hunting occur?

YES : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 7.

NO : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

STEP 7. Retest the system

Q: Does hunting occur?

YES : Return to Step 1.

NO : The procedure is complete.
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