Engine General Information and Diagnosis: 1A-52
DTC “C23” (P1651-H/L): TO Sensor Circuit Malfunction
B933H21104015
Detected condition and possible cause
Wiring diagram
ECM coupler (Harness side)
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent the terminal damage or terminal bend.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-12)”.
Detected condition
Possible cause
C23
The sensor voltage should be the
following for 2 sec. and more, after ignition
switch is turned ON.
0.2 V
≤
Sensor voltage < 4.7 V
• TO sensor circuit open or short.
• TO sensor malfunction.
• ECM malfunction.
P1651
H
Sensor voltage is higher than specified
value.
• TO sensor circuit open or shorted to VCC or ground
circuit open.
L
Sensor voltage is lower than specified
value.
• TO sensor circuit shorted to ground or VCC circuit open.
TO sensor
ECM
VCC
TOS
E2
R
Br/W
B/Br
13
10
24
I933H1110052-01
I933H1110012-02
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