DTC 23

DTC 23: ECM [M/T] or PCM [A/T] and Its Related Components

DTC SET CONDITIONS
This DTC is set when there is an failure in the ECM [M/T] or PCM [A/T] and its related components.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
- Malfunction of the MFI system.
- Malfunction of the A/T system [A/T].
- Malfunction of the ECM [M/T] or PCM [A/T].

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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for A/T system diagnostic trouble code. (Refer to Reading and Clearing 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 Diagnosis trouble code Descriptions). Then go to Step 4.

NO : Go to Step 3.

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

Read the auto-cruise control system diagnostic trouble codes. Reading Diagnostic Trouble Codes

Q: Is DTC 23 set?

YES : Replace the ECM [M/T] or PCM [A/T]. Then go to Step 4.

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

STEP 4. Read the auto-cruise control system diagnostic trouble code.

Read the auto-cruise control system diagnostic trouble codes. Reading Diagnostic Trouble Codes

Q: Is DTC 23 set?

YES : Return to Step 1.

NO : The procedure is complete.