DESCRIPTION The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the 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: P1607 is not present.
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Toyota Tundra Service Manual > Theft Deterrent System: Security Horn Circuit
DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn to sound at intervals of 0.4 seconds. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuse ...