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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.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
  • ECM failed.
 
 
 
DIAGNOSIS
STEP 1. Test the OBD-II drive cycle.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn the ignition switch to the "ON" position and delete the DTC.
(3) Carry out the test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(4) Check the diagnostic trouble code (DTC).
Is DTC P0604 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 2.
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 .
 
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P062F set?
Retry the troubleshooting.
The inspection is complete.