P1245

DTC P1245: Cycle RAM Test (Engine)

TECHNICAL DESCRIPTION
Monitors the computation function of the ECM periodically.

DTC SET CONDITIONS

Check Condition
- Ignition switch is "ON" position.

Judgment Criterion
- RAM data (engine) is defect.

FAIL-SAFE AND BACKUP FUNCTION
- Microcomputer is reset.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- ECM failed.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).







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. Read the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P1245 set?

YES : Replace the ECM. When the ECM is replaced, register the ID code.

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