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1A-69 Engine General Information and Diagnosis:

DTC “C23” (P1651-H/L): TO Sensor Circuit Malfunction

B817H21104016

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-15)”.

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 < 4.8 V

• TO sensor circuit open or short.

• TO sensor malfunction.

• ECM malfunction.

P1651

Sensor voltage is higher than specified

value.

• TO sensor circuit shorted to Vcc or ground circuit open.

Sensor voltage is lower than specified

value.

• TO sensor circuit open or shorted to ground or Vcc

circuit open.

B/Br

ECM

Vcc

TO sensor

TOS

I718H1110066-02

I718H1110240-01

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