Dtc P0604 Internal Control Module Random Access Memory (Ram) Error

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

INSPECTION PROCEDURE

READ OUTPUT DTC

DTC P0604 Internal Control Module Random Access Memory (RAM) Error

DTC P0606 ECM / PCM Processor

DTC P0607 Control Module Performance

DTC P060A Internal Control Module Monitoring Processor Performance

DTC P060D Internal Control Module Accelerator Pedal Position Performance

DTC P060E Internal Control Module Throttle Position Performance

DTC P0657 Actuator Supply Voltage Circuit / Open

DTC P1607 Cruise Control Input Processor


DESCRIPTION

The ECM continuously monitors its internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check ensures that the ECM is functioning properly. If any malfunction is detected, the ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal "mirroring" of the main CPU and the sub CPU to detect Random Access Memory (RAM) errors. The 2 CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the signals sent to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage, and 4) any other ECM malfunction is found.

DTC No.
DTC Detection Condition
Trouble Area
P0604
P0606
P0607
P060A
P060D
P060E
P0657
P1607
ECM internal error (1 trip detection logic)
ECM

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ OUTPUT DTC

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Turn the ignition switch off and turn the tester off.

  1. Disconnect the 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 tester to the DLC3.

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

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

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    DTC P0604, P0606, P0607, P060A, P060D, P060E, P0657 and/or P1607 are output
    		A
    DTC is not output
    		B
    DTC P0604, P0606, P0607, P060A, P060D, P060E, P0657, P1607 and other DTCs are output
    		C
    HINT:
    If any DTCs other than P0604, P0606, P0607, P060A, P060D, P060E, P0657 or P1607 are output, troubleshoot those DTCs first.


B
CHECK FOR INTERMITTENT PROBLEMS (CAMRY_ACV40 RM000000PDQ0KDX.html)

C
GO TO DTC CHART (CAMRY_ACV40 RM000000PDF0C4X.html)
A

REPLACE ECM (CAMRY_ACV40 RM0000017UO02YX.html)