DTC 23
DTC P23: ECMDTC SET CONDITIONS
This DTC is set when there is an failure in the ECM
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 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 MFI Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Code) <2.4L engine> or (Refer to MFI Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Code) <3.8L engine>.
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) <2.4L engine> or (Refer to MFI Diagnosis - Diagnostic Trouble Code Chart) <3.8L engine>. Then go to Step 4.
NO: Go to Step 3
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.
2. Turn the ignition switch to the "ON" position.
3. Check for A/T system diagnostic trouble code. (Refer to A/T 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 A/T system. (Refer to A/T Diagnosis - Diagnostic Trouble Code Chart). 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.
Q: Is DTC P23 set?
YES: Replace the ECM
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.
Q: Is DTC P23 set?
YES: Return to Step 1.
NO: The procedure is complete.