Pinout Values and Diagnostic Parameters

1GR-FE ENGINE CONTROL: SFI SYSTEM: TERMINALS OF ECM

1. CHECK ECM

(a) Measure the voltage of the ECM connectors.

HINT
The standard 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 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.

(b) Waveform 1

Camshaft Timing Oil Control Valve

Heated Oxygen Sensor

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

(d) Waveform 3

Fuel Injector No. 1 (to No. 6) Injection Signal

HINT
The wavelength becomes shorter as the engine speed increases.

(e) Waveform 4

Knock Sensor

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

(f) Waveform 5

Crankshaft Position Sensor and VVT Sensor

HINT
The wavelength becomes shorter as the engine speed increases.

(g) Waveform 6

Crankshaft Position Sensor and VVT Sensor

HINT
The wavelength becomes shorter as the engine speed increases.

(h) Waveform 7

Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)

HINT
The wavelength becomes shorter as the engine speed increases.

(i) Waveform 8

Purge VSV

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

(j) Waveform 9

Vehicle Speed Signal

HINT
The wavelength becomes shorter as the vehicle speed increases.

(k) Waveform 10

Throttle Actuator Positive Terminal

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

(l) Waveform 11

Throttle Actuator Negative Terminal

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

(m) Waveform 12

Engine Speed Signal

HINT
The wavelength becomes shorter as the engine speed increases.

(n) Waveform 13

CAN Communication Signal

HINT
The waveform varies depending on the CAN communication signal.

(o) Waveform 14

CAN Communication Signal

HINT
The waveform varies depending on the CAN communication signal.

(p) Waveform 15

Engine Speed Signal