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6-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0117 Engine Coolant Temperature Circuit Low
WIRING DIAGRAM
C64
7
6
5
4
17
16
15
14
13
12
27
26
25
24
23
22
34
33
32
1. ECT sensor
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
DTC will be set when all of the following conditions are
detected for 5 seconds continuously.
• Engine is running
• Voltage of ECT sensor output is less than the specified
value
(High engine coolant temperature (low voltage/low resis-
tance))
DTC CONFIRMATION PROCEDURE
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec. or more.
4) Check DTC and pending DTC.
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System
Check" performed?
2
ECT sensor and its circuit check.
1) Connect scan tool with ignition switch
turned OFF.
2) Turn ignition switch ON.
3) Check engine coolant temp. displayed on
scan tool.
Is 164°C (327°F) indicated?
1
LT GRN
ORN
3
C63
3
2
1
7
6
5
4
3
11
10
9
8
19
18
17
16
15
14
13
21
20
19
18
27
26
25
24
31
30
29
28
35
34
33
32
2. ECM
3. To other sensors
Action
C63-16
C63-28
ORN
G91
2
1
6
5
4
3
12
11
10
9
8
16
15
14
13
12
11
10
23
22
21
20
27
26
25
24
23
22
21
31
30
29
28
35
34
33
32
31
• ECT sensor circuit
• ECT sensor
• ECM
Go to Step 2.
Go to Step 3.
2
2
1
7
9
8
20
19
18
17
30
29
28
TROUBLE AREA
Yes
Go to "Engine and Emis-
sion Control System
Check" in this section.
Intermittent trouble check
for intermittent referring to
"Intermittent and Poor
Connection" in section
0A.
No
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