1A-59 Engine General Information and Diagnosis:
DTC “C23” (P1651-H/L): TO Sensor Circuit Malfunction
B944H11104016
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 terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-15)”.
Detected Condition Possible Cause
C23
The sensor voltage should be the
following.
0.2 V ≤ Sensor voltage < 4.6 V
• TO sensor circuit open or short.
• TO sensor malfunction.
• ECM malfunction.
P1651
H
Sensor voltage is higher than specified
value.
• TO sensor circuit is open or ground circuit open.
L
Sensor voltage is lower than specified
value.
• TO sensor circuit is open or shorted to ground or VCC
circuit open.
B/Br
R
Br/W
ECM
VCC
E2
TO sensor
TOS
5
20
12
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I944H1110046-01
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