DTC P0604 Random Access Memory (RAM)
Description DTC P0604
The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. It 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 Code | DTC Detection Condition | Trouble Area |
| P0604 | ECM RAM errors. | ECM |
Inspection procedure
HINT:
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 DTC |
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Clear the DTC .
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Turn the ignition switch off.
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Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
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Connect the cable to the negative (-) battery terminal.
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Turn the ignition switch to ON.
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Connect the intelligent tester to the DLC3.
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Turn the tester on.
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Enter the following menus: Powertrain / Engine and ECT / DTC.
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Check for DTC.
OK:
P0604 is not output.
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| OK | |
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