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Toyota Sienna Service Manual: Internal Control Module Random Access Memory (RAM) Error

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Internal Control Module Random Access Memory (RAM) Error

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

DESCRIPTION

The ECM continuously monitors its own 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 sets the appropriate DTC and illuminates 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 two CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or 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.

DESCRIPTION

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

ECM RAM errors:

ECM RAM errors

INSPECTION PROCEDURE

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0604)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester on.
  4.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
  5.  Read DTCs.

Result

Result

REPLACE ECM

System Voltage
DTC P0560 System Voltage MONITOR DESCRIPTION The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze ...

ECM / PCM Processor
DTC P0606 ECM / PCM Processor DESCRIPTION The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) transistors. This self-check ensures ...

Other materials:

DTC check / clear
1. CHECK DTC Prepare the intelligent tester. Connect the intelligent tester to DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch ON. Use the intelligent tester to check the DTCs, and note them down (For operating instructions, see the int ...

On-vehicle inspection
1. CHECK VVT SENSOR OUTPUT VOLTAGE Turn the ignition switch to the ON position. Check the voltage between the specified terminal and body ground. Standard voltage While turning the crankshaft pulley by hand, measure the voltage between each terminal. Check that the voltage ...

Hitch
Trailer hitch assemblies have different weight capacities. Toyota recommends the use of Toyota hitch/bracket for your vehicle. For details, contact your Toyota dealer. If you wish to install a trailer hitch, contact your Toyota dealer. Use only a hitch that conforms to the gross trailer w ...

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