DTC 23

DTC 23: ECM and Its Related Component

DTC SET CONDITIONS
This DTC is set when there is an failure in the ECM and its related components.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of the MFI system.
- 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

STEP 1. Using scan tool MB991958, check for MFI system diagnostic trouble code.






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. Check for MFI system diagnostic trouble code (Refer to MFI Diagnosis - Diagnostic Function). Diagnostic Function
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 MFI Diagnosis - Diagnostic Trouble Code Chart). Then go to Step 3.

NO : Go to Step 2.

STEP 2. Read the auto-cruise control system diagnostic trouble code.

1. Disconnect the negative (-) battery terminal, to erase the diagnostic trouble code of the auto-cruise control system.
2. Connect the negative (-) battery terminal.
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 (turn on the "CRUISE" indicator light).
4. Read the diagnostic trouble code of the auto-cruise control system. Reading Diagnostic Trouble Codes

Q: Is DTC 23 set?

YES : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Troubleshooting - ID Code Registration Judgment Table). Then go to Step 3.

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 Malfunction).

STEP 3. Read the auto-cruise control system diagnostic trouble code.

1. Disconnect the negative (-) battery terminal, to erase the diagnostic trouble code of the auto-cruise control system.
2. Connect the negative (-) battery terminal.
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 (turn on the "CRUISE" indicator light).
4. Read the diagnostic trouble code of the auto-cruise control system. Reading Diagnostic Trouble Codes

Q: Is DTC 23 set?

YES : Return to Step 1.

NO : The procedure is complete.