CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0604/P0606/P0607/P0657)
DTC P0604 Internal Control Module Random Access Memory (RAM) Error
DTC P0606 ECM / PCM Processor
DTC P0607 Control Module Performance
DTC P0657 Actuator Supply Voltage Circuit / Open
Description
The ECM continuously monitors its internal memory status, internal circuits, and output signals sent to the throttle actuator. This self-check insures 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 CPU also perform continuous mutual monitoring. The ECM illuminates the MIL and set 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 P0657 |
ECM internal error (1 trip detection logic) | ECM |
Inspection procedure
HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OTHER DTC OUTPUT (IN ADDITION TO DTC P0604/P0606/P0607/P0657) |
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Connect the intelligent tester to the DLC3.
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Turn the engine switch on (IG).
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Turn the tester ON.
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Enter the following menus: Power train / Engine / DTC.
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Read the DTC.
Result:
| Display (DTC output) | Proceed to |
| P0604, P0606, P0607, P0657 | A |
| No output DTC | B |
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| A | ||
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