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DTC P0604: Internal Control Module Random Access Memory (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
  • Ignition switch is "ON" position.
Judgment Criterion
  • When RAM error data is detected 100 times or more.
 
 
DTC SET CONDITIONS <RAM complement error>
Logic Flow Chart
Check Condition
  • Ignition switch is "ON" position.
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
  • Ignition switch is "ON" position.
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.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • ECM failed.
 
 
 
DIAGNOSIS
Required Special Tool:
  • 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).
cautionTo 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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC P0604 set?
Replace the ECM (Refer to, Removal and Installation ).
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .