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DTC P1240: Ignition Angle
 
 
 
 
TECHNICAL DESCRIPTION
Checks for an abnormal ignition timing retard angle demand signal from the active stability control (ASC).
 
 
DTC SET CONDITIONS
Check Condition
  • Ignition switch is "ON" position.
Judgment Criterion
  • The ignition timing retard angle demand signal is not normal.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Ignition retard is not carried out.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the ASC-DTC stored?
Refer to GROUP 35C, ASC Diagnosis - Diagnosis Code Chart .
Replace the ECM (Refer to Removal and Installation ).