DTC 23

DTC 23: Powertrain Control Module (PCM) and Its Related Components

DTC SET CONDITIONS
This DTC is set when there is an failure in the PCM 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.
- Malfunction of the PCM.

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. How to Connect the Scan Tool (M.U.T. -III)
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system diagnostic trouble code.(Refer to How to Read and Erase Diagnostic Trouble Code. [2.4L Engine] Reading Diagnostic Trouble Codes Clearing Diagnostic Trouble Codes or (Refer to How to Read and Erase Diagnostic Trouble Code. [3.8L Engine]) 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 MFI system. (Refer to Diagnostic Trouble Code Chart [2.4L Engine]) Diagnostic Trouble Code Descriptions or (Refer to Diagnostic Trouble Code Chart [3.8L Engine]) Diagnostic Trouble Code Descriptions. Then go to Step 4.

NO : Go to Step 2.

STEP 2. Using scan tool MB991958, read the A/T 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. How to Connect the Scan Tool (M.U.T. -III)
2. Turn the ignition switch to the "ON" position.
3. Check for A/T system diagnostic trouble code. (Refer to How to Read and Erase Diagnostic Trouble Code) Diagnostic Strategies
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 Diagnostic Trouble Code Chart). Diagnostic Trouble Code Descriptions Then go to Step 4.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the auto-cruise control 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. How to Connect the Scan Tool (M.U.T. -III)
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to read the auto-cruise control system diagnostic trouble codes. Reading Diagnostic Trouble Codes
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is DTC 23 set?

YES : Replace the PCM. When the PCM is replaced, register the encrypted code. Then go to Step 4.

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

STEP 4. Using scan tool MB991958, read the auto-cruise control system diagnostic trouble code.