DESCRIPTION The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect the 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.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN
CAUTION / NOTICE / HINT NOTICE: After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (See page ). HINT: Read freeze frame data using a Techstream. Freeze frame data record 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. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Clear DTCs (See page ). (e) Turn the ignition switch off and turn the Techstream off. (f) Disconnect the Techstream. (g) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. (h) Connect the cable to the negative (-) battery terminal. (i) Connect the Techstream to the DLC3. (j) Turn the ignition switch to ON. (k) Turn the Techstream on. (l) Wait for 16 seconds or more. (m) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. (n) Read DTCs. OK: P0604 is not present.
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Toyota Tundra Service Manual > Front Power Seat Control System(w/ Memory): Wireless Transmitter Memory Function does not Operate
DESCRIPTION With the ignition switch off and the driver door closed, pressing the manual lock or unlock switch on the power window regulator master switch assembly while holding a seat memory switch (M1 switch or M2 switch) will register the transmitter recognition code into the seat memory switch t ...