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DTC No. P1A53-9E ENGINE ECU Wake-up Signal Latching Circuit Stuck ON
 
 
 
 
DTC SET CONDITION
Check Condition
  • The 12V battery voltage is more than 9.0 V.
  • The PHEV-ECU power supply voltage is more than 9.0 V.
  • The PHEV-ECU wakeup signal [engine control module (ECM)] input is ON.
  • The cutoff latching control output is OFF.
Judgment Criterion
  • The signal monitor status is OFF for 1.5 seconds.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the PHEV-ECU
 
 
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
1.Check whether the DTC is set again.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).