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HOMESERVICE MANUALSLEXUS2010LX 570 V8-5.7L (3UR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDIAGRAMS
2010 Lexus LX 570 V8-5.7L (3UR-FE)

Engine Control Module: Diagrams

2010 Lexus LX 570 V8-5.7L (3UR-FE)SECTION Diagrams




3UR-FE ENGINE CONTROL: SFI SYSTEM: TERMINALS OF ECM

1. CHECK ECM





HINT
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.





























HINT
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

(a) WAVEFORM 1:









(b) WAVEFORM 2:









HINT
The wavelength varies in accordance with the engine operating condition.

(c) WAVEFORM 3:









HINT
In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.

(d) WAVEFORM 4:









HINT
The wavelength becomes shorter as the engine speed increases.

(e) WAVEFORM 5:









HINT
* The wavelength becomes shorter as the engine speed increases.
* The waveforms and amplitudes displayed differ slightly depending on the vehicle.
(f) WAVEFORM 6:









HINT
The wavelength becomes shorter as engine speed increases.

(g) WAVEFORM 7:









HINT
The wavelength becomes shorter as engine speed increases.

(h) WAVEFORM 8:









HINT
If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

(i) WAVEFORM 9:









HINT
The wavelength becomes shorter as the vehicle speed increases.

(j) WAVEFORM 10:









HINT
The duty ratio varies depending on the throttle actuator operation.

(k) WAVEFORM 11:









HINT
The duty ratio varies depending on the throttle actuator operation.

(l) WAVEFORM 12:









HINT
The wavelength becomes shorter as the engine speed increases.

(m) WAVEFORM 13:









HINT
The waveform varies depending on the CAN communication signal.

(n) WAVEFORM 14:









HINT
The waveform varies depending on the CAN communication signal.

(o) WAVEFORM 15:









HINT
The wavelength becomes shorter as the engine speed increases.

(p) WAVEFORM 16:









HINT
The wavelength changes when the air injection control driver detects malfunctions in the air injection system P0412.

(q) WAVEFORM 17:









HINT
The wavelength becomes shorter as engine speed increases.










RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.