DTC 23

DTC 23: ECM and Its Related Component

DTC SET CONDITIONS
This DTC is set when there is 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, read the 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.
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). Reading 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 MFI system (Refer to Diagnostic Trouble Code Chart). Then go to Step 3. Diagnostic Trouble Code Descriptions

NO: Go to Step 2.

STEP 2. Read the auto-cruise control system diagnostic trouble code.
1. Erase diagnostic trouble code.
2. Turn the ignition switch to the "ON" position.
3. Turn the "ON/OFF" switch to the "ON" position (turn on the "CRUISE" indicator lamp).
4. Read the diagnostic trouble codes.

Q: Is DTC 23 set?

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

NO: It can be assumed that this malfunction is intermittent.

STEP 3. Read the auto-cruise control system diagnostic trouble code.
1. Erase diagnostic trouble code.
2. Turn the ignition switch to the "ON" position.
3. Turn the "ON/OFF" switch to the "ON" position (turn on the "CRUISE" indicator lamp).
4. Read the diagnostic trouble codes.

Q: Is DTC 23 set?

YES: Return to Step 1.

NO: The procedure is complete.