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6-112 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P1600 SERIAL COMMUNICATION PROBLEM BETWEEN ECM AND TCM
WIRING DIAGRAM
IG1
CIRCUIT DESCRIPTION
The serial data line is pulled up to about 12 V by ECM and TCM transmits information to ECM through it by con-
trolling its grounding.
TCM constantly sends information while ignition switch is ON as to whether judgement was made or not with
respect to all detectable DTCs as well as whether or not abnormality exists after judgement.
DTC DETECTING CONDITION
No signal inputted from TCM to ECM or check sum
error while engine running
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Start engine and run it at idle for 1 min.
4) Select "DTC" mode on scan tool and check DTC.
INSPECTION
Step
1
Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2
Check Signal Voltage.
Check voltage between terminal C41-23 and
body ground with ignition switch ON.
Does it change between 0 – 12 V? See Fig. 1.
TCM
C44-20
C42 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
Action
BLK/WHT
C41-23
C41 (24P)
7
6
5
4
3
2
1
6
5
12
11
16
15
14
13 12
11
10
9
8
24
23
22
21
20
19
18
17
17
16
POSSIBLE CAUSE
• "BLK/WHT" circuit open or short
• TCM power or ground circuit open
• TCM malfunction
• ECM malfunction
Yes
Go to Step 2.
Intermittent trouble or
faulty ECM or TCM.
Check for intermittent
trouble referring to "Inter-
mittent and poor connec-
tion" in Section 0A.
ECM
12V
G02 (17P)
4
3
2
1
10
9
8
7
15
14
13
No
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
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