Pinout Values and Diagnostic Parameters

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

1. CHECK ECM

(a) Measure the voltage according to the value(s) in the table below.

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

*2: for 2WD only

(b) WAVEFORM 1:

Camshaft timing oil control valve (OCV)

Heated oxygen sensor

HINT
In DATA LIST, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

(d) WAVEFORM 3:

Injector No. 1 (to No. 8) injection signal

HINT
The wavelength becomes shorter as the engine rpm increases.

(e) WAVEFORM 4:

Knock sensor

HINT
* The wavelength becomes shorter as the engine rpm increases.
* The waveforms and amplitudes displayed differ slightly depending on the vehicle.

(f) WAVEFORM 5:

Crankshaft position sensor and VVT sensor for intake side

HINT
The wavelength becomes shorter as engine rpm increases.

(g) WAVEFORM 6:

Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM)

HINT
The wavelength becomes shorter as engine rpm increases.

(h) WAVEFORM 7:

Purge VSV

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

(i) WAVEFORM 8:

Vehicle speed signal

HINT
The wavelength becomes shorter as the vehicle speed increases.

(j) WAVEFORM 9:

Throttle actuator positive terminal

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

(k) WAVEFORM 10:

Throttle actuator negative terminal

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

(l) WAVEFORM 11:

Engine speed signal

HINT
The wavelength becomes shorter as the engine rpm increases.

(m) WAVEFORM 12:

CAN communication signal

HINT
The waveform varies depending on the CAN communication signal.

(n) WAVEFORM 13:

CAN communication signal

HINT
The waveform varies depending on the CAN communication signal.

(o) WAVEFORM 14:

Crankshaft position sensor and camshaft position sensor

HINT
The wavelength becomes shorter as the engine rpm increases.

(p) WAVEFORM 15:

Terminal DI of air injection control driver

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

(q) WAVEFORM 16:

Crankshaft position sensor and VVT sensor for exhaust side

HINT
The wavelength becomes shorter as engine rpm increases.