1A-144 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and
confirm that the trouble has been corrected.
DTC P1603: TCM Trouble Code Detected
S7RS0B1104061
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.
“RADIO” fuse blown,
“WHT” or “WHT/RED”
wire is circuit open or
short circuit.
E23 C37
34
1819
5671011
1720
47 46495051
2122
52
1625
9
24
14
29
5557 54 53
59
60 58
2
262728
15
30
56 48
32 31343536374042 39 38
44
45 43 41 33
11213
23
834
1819
5671011
1720
47 46495051
2122
52
1625
9
24
14
29
5557 54 53
59
60 58
2
262728
15
30
56 48
32 31343536374042 39 38
44
45 43 41 33
11213
23
8
1
RED
WHT
C37-13
C37-12
RED
WHT
C34-7
C34-17
2
I6RS0C110026-01
1. ECM 2. TCM (for A/T model)
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