6-2-36 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
Inspection of ECM and Its Circuits
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage, pulse signal and resistance.
Voltage Check
1) Remove ECM (1) from vehicle body referring to “Engine
Control Module (ECM) Removal and Installation” in Section
6E2.
2) Check voltage and/or pulse signal at each terminal of cou-
plers (2) connected, using voltmeter (3) and oscilloscope (4).
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with coupler
disconnected from it.
NOTE:
• As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition
switch is turned ON.
• Voltage with asterisk(*) cannot be measured by voltme-
ter because it is pulse signal.
Check it with oscilloscope if necessary.
2
3
1
4
1. ECM
2. ECM couplers (Viewed from harness side)
E23 E22 E21
12345671234561234567
7
891011121314151617 8910111213141516 891011121314151617
1819
1819
1718192021222324252627 20212223 202122232425 24252627 2627
2829303132 32 282930 28293031 3133 33 323334 3435 3435
1
2
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