Inspection of ECM and Its Circuits 1

Inspection of ECM and Its Circuits

ECM and its circuits can be checked by measuring voltage, pulse signal and resistance with special tool connected.

CAUTION:
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM with ECM connectors disconnected from it.

Voltage Check




1. Remove ECM (1) from its bracket.
2. Connect special tool (A) between ECM and ECM connectors securely.
3. Check voltage and/or pulse signal using voltmeter (2) and oscilloscope (3).

NOTE:
- As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is turned ON.
- Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use oscilloscope for its check if necessary.
- Before performed this inspection, be sure to read the Precautions of ECM Circuit Inspection.

Ter. C37-1 - C37-10:

Ter. C37-11 - C37-17:

Ter. C37-18 - C37-26:

Ter. C37-27 - C37-33:

Ter. C37-34 - C37-47:

Ter. C37-48 - C37-56:

Ter. C37-57 - C37-68:

Ter. C37-69 - C37-81:

ECM connector "C37"

Ter. E23-1 - E23-6:

Ter. E23-7 - E23-14:

Ter. E23-15 - E23-22:

Ter. E23-23 - E23-28:

Ter. E23-29 - E23-40:

ECM connector "E23"

Reference waveform No.1







Oxygen (1) and heater output (2) signals of heated oxygen sensor-2 (Bank-1 and Bank-2):

Reference waveform No.2







Oxygen signal (1) and heater output signal (2) of heated oxygen sensor-2:

Reference waveform No.3







MAF sensor signal (1):

Reference waveform No.4







EVAP canister purge valve Signal:

Reference waveform No.5







EGR valve Signal:

Reference waveform No.6







Fuel injector signal:

Reference waveform No.7







Fuel injector No.5 (1), CKP sensor (2) and CMP sensor (3) signals: