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DTC P0604-00: RAM error
 
 
 
 
TECHNICAL DESCRIPTION
Monitors the computation function of the ECM periodically.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS <Functional check - all RAM area>
Logic Flow Chart
Check Condition
  • Power supply mode of electric motor switch is ON.
Judgment Criterion
  • When RAM error data is detected 100 times or more.
 
 
DTC SET CONDITIONS <RAM complement error>
Logic Flow Chart
Check Condition
  • Power supply mode of electric motor switch is ON.
Judgment Criterion
  • When RAM complement error data is detected 20 times or more.
 
 
DTC SET CONDITIONS <Functional check – RAM of electronic throttle valve control>
Logic Flow Chart
Check Condition
  • Power supply mode of electric motor switch is ON.
Judgment Criterion
  • When RAM of electronic throttle valve control error data is detected.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Microcomputer is reset.
    or
  • Throttle opening degree position is in default position.
 
 
OBD-II DRIVE CYCLE PATTERN
None.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set 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
1.STEP 1. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.
After erasing the DTC, check again to see if the DTC is set again.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Turn OFF the power supply mode of the electric motor switch.
(3) Turn ON the power supply mode of the electric motor switch.
(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P0604-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).