9262866

Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection" procedure.

Ignition Switch "OFF"

Refer to "Shop Manual" and disconnect the water sensor connector.

Ignition Switch "ON"

Measure voltage of Pin No. 1(power) of the water sensor connector and chassis ground.

Specification : B+

Is the measured value within specification?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Ignition Switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect the water sensor connector.

Measure resistance of Pin No. 3(ground) of the water sensor connector and chassis ground.

Specification : Approx. below 1Ω

Ignition switch "OFF"

Refer to "Shop Manual" and disconnect the water sensor connector.

Ignition switch "ON"

Measure voltage of Pin No. 1(power) of the water sensor connector and chassis ground.(A)

Measure voltage between Pin No. 1(power) and Pin No. 3(ground) of the water sensor connector.(B)

Specification : Difference (A) and (B) is less then 200 mV

10.

Is the measured value within specification?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Ignition Switch "OFF"

Refer to "Shop Manual" and disconnect the water sensor connector.

Ignition Switch "ON"

Measure voltage of Pin No. 2(signal) of the water sensor connector and chassis ground.

Specification : Approx. 0V

Fig.1 ) Waveform of Lambda Sensor Unit.

Ignition Switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect the water sensor and ECM/PCM connector.

Measure resistance between Pin No. 2(signal) of the water sensor connector and Pin No. 77(signal) of the ECM/PCM connector.

Specification : Approx. below 1Ω

Is the measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.