Part 1

Inspection of ECM and Its Circuits
ECM and its circuits can be checked at ECM wiring couplers by measuring voltage, pulse signal and resistance.

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

Voltage Check
1. Remove ECM (1) from vehicle body referring to Engine Control Module (ECM) Removal and Installation.
2. Check voltage and/or pulse signal at each terminal of couplers (2) connected using voltmeter (3) and oscilloscope (4).

Viewed From Harness Side:

Connector:G04 (Part 1):

Connector:G04 (Part 2):

Connector:G04 (Part 3):

Connector:C45 (Part 1):

Connector:C45 (Part 2):

Connector:C45 (Part 3):

Connector:C46 (Part 1):

Connector:C46 (Part 2):

Connector:C46 (Part 3):

NOTE:
- As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition switch is turned ON.
- Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.

Reference Waveform No. 1:

1.Reference waveform No. 1

Reference Waveform No. 2:

2.Reference waveform No. 2

Reference Waveform No. 3:

3.Reference waveform No. 3

Reference Waveform No. 4:

4.Reference waveform No. 4

Reference Waveform No. 5:

5.Reference waveform No. 5

Reference Waveform No. 6:

6.Reference waveform No. 6

Reference Waveform No. 7:

7.Reference waveform No. 7

Reference Waveform No. 8:

8.Reference waveform No. 8

Reference Waveform No. 9:

9.Reference waveform No. 9

Reference Waveform No. 10:

10.Reference waveform No. 10

Reference Waveform No. 11:

11.Reference waveform No. 11

Reference Waveform No. 12:

12.Reference waveform No. 12

Reference Waveform No. 13:

13.Reference waveform No. 13

Reference Waveform No. 14:

14.Reference waveform No. 14

Reference Waveform No. 15:

15.Reference waveform No. 15

Reference Waveform No. 16:

16.Reference waveform No. 16

Reference Waveform No. 17:

17.Reference waveform No. 17