Engine General Information and Diagnosis: 1A-170
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
DTC P1603: TCM Trouble Code Detected (For J20 Engine)
S5JB0A1104057
Wiring Diagram
DTC Detecting Condition
When ECM receives a trouble code from TCM, which indicates that some problem occurred in sensor circuits and its
calculated values used for operations such as idle speed control, engine power control, and so on by TCM, ECM sets
DTC P1603. (TCM outputs the trouble code to ECM when TCM can not compute the engine control signal due to
malfunctions of sensor circuits used for gear shift control.)
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
Battery voltage supply circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) With engine running, measure voltage between “E23-2”
terminal of ECM connector and engine ground.
Is voltage 10 – 14 V?
Poor “E23-2”
connection or
intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
If wire and connections
are OK, substitute a
known-good ECM and
recheck.
“DOME” fuse blown,
“WHT” wire is circuit
open or short circuit.
WHT/BLU
WHT/RED
E23
C37
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
E23-4
E23-19
1
RED
WHT
E03-12
E03-6
WHT/BLU
WHT/RED
E03-8
E03-10
RED
WHT
E92-7
E92-17
2
3
I5JB0A110067-02
1. ECM
2. TCM (for A/T model)
3. ABS hydraulic unit / control module assembly
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