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6-1-32 GENERAL INFORMATION AND ENGINE DIAGNOSIS
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8
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21
INSPECTION OF ECM (PCM) AND ITS
CIRCUITS
ECM (PCM) and its circuits can be checked at ECM (PCM) wiring
couplers by measuring voltage and resistance.
CAUTION:
ECM (PCM) cannot be checked by itself. It is strictly prohib-
ited to connect voltmeter or ohmmeter to ECM (PCM) with
coupler disconnected from it.
Voltage Check
1) Remove ECM (PCM) (1) from body referring to Section 6E1.
2) Check voltage at each terminal of couplers (2) connected.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11 V or more when ignition switch is ON.
3. Body ground
4. Service wire
E21
2
1
8
7
6
5
4
3
15
14
20
19
18
16
17
16
2
E23
2
1
11
7
6
5
4
3
15
14
13
10
9
22
12
11
E22
10
9
3
8
6
5
4
7
19
21
20
18
15
14
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16
1. ECM (PCM)
2. ECM (PCM) couplers
(Viewed from harness side)
2
1
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