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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
MAIN RELAY
3
5
6
4
1
2
B47
B72
B47
1
1
2
3
3
4 5 6
5
B21
1 2 3 4
5 6 7 8
12 13 14 15
16 17 18 19
23 24 25 26 27 28 29 30 31 32 33
34
35
36
37
38
42
43
44 45
48
49
50
51
Step
1
CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 5 (+) — Chassis ground (
(B135) No. 6 (+) — Chassis ground (
TO FRONT OXYGEN(A/F) SENSOR
No.12
A:
B134
B:
B135
ECM
D:
B137
B21
E2
E
A:
B134
2
1
2
3
4
5
4
8
9
10
11 12 13 14 15
6
18 19 20 21
22 23
24
28
29
30 31
32
9 10 11
20 21 22
39
40
41
46
47
52
53
54
−
):
−
):
EN(H4DOTC)(diag)-156
IGNITION
B72
SWITCH
SBF-6
6
3
B:
B135
6
7
1
2
3
16 17
10
11 12 13 14 15
8
9
25
26 27
20 21
22 23
24
33 34
28
29 30 31
32 33
Check
Is the voltage 10 — 13 V?
SBF-5
SBF-7
No.13
BATTERY
MAIN SBF
D:
B137
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15
16 17 18 19
18 19 20 21
25
26 27
26
27
34 35
Yes
Go to step 2.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
E
4
5
6
7
16 17
22 23
24 25
28 29
30 31
EN-03519
No
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