Dtc P0604 Random Access Memory (Ram)

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

CHECK FOR DTC

DTC P0604 Random Access Memory (RAM)


DESCRIPTION

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. The ECM memory status is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store a DTC immediately.

DTC No.
DTC Detection Condition
Trouble Area
P0604
ECM RAM errors (Main CPU and sub CPU mirroring failure) (1 trip detection logic).
ECM

MONITOR STRATEGY


Required sensors/Components
ECM
Frequency of operation
Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON and turn the intelligent tester on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the intelligent tester off.
  5. Turn the ignition switch off.
  6. Disconnect the intelligent tester.
  7. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
  8. Connect the cable to the negative (-) battery terminal.
  9. Connect the intelligent tester to the DLC3.
  10. Turn the ignition switch to ON and turn the intelligent tester on.
  11. Wait 16 seconds or more.
  12. Enter the following menus: Powertrain / Engine / DTC.
  13. Read the pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  15. Input the DTC: P0604.
  16. Check the DTC judgment result.

    Tester Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
  17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (HILUX_TGN26 RM000000PDK130X.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK130X.html).

  1. Turn the intelligent tester off.

  1. Turn the ignition switch off.

  1. Disconnect the intelligent tester.

  1. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

  1. Connect the cable to the negative (-) battery terminal.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the intelligent tester on.

  1. Wait 16 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Check for DTCs.

    OK:
    P0604 is not output.


NG
REPLACE ECM (HILUX_TGN26 RM000000VW202TX.html)
OK

CHECK FOR INTERMITTENT PROBLEMS (HILUX_TGN26 RM000000PDQ0Z2X.html)