DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT) (LOW VOLTAGE); On Board Diagnosis Logic; DTC Confirmation Procedure; Overall Function Check

EF & EC-7106prose procedure

Overall Function Check appears to be truncated at the bottom of this page — likely continues on EF & EC-7107.

CG10, CGA3

On Board Diagnosis Logic

To judge the malfunction, the output from the heated oxygen sensor 1 (front) is monitored to determine whether the output voltage is sufficiently low.

Code P0131

Heated Oxygen Sensor 1 (Front) (Low Voltage)

DTC Confirmation Procedure

CAUTION

Always drive vehicle at a safe speed.

NOTE

If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 1 second before conducting the next test.

With CONSULT-II

1
Start engine and warm it up to normal operating temperature. If 1st trip DTC is detected, go to "Diagnostic Procedure", EC-7107.
2
Stop engine and wait at least 1 second.
3
Turn ignition switch "ON" and select "DATA MONITOR" with CONSULT-II.
4
Start engine and let it idle for at least 3 minutes.
5
If 1st trip DTC is detected, go to "Diagnostic Procedure", EC-7107.

Overall Function Check

Use this procedure to check the overall function of the heated oxygen sensor 1 (front) circuit. During this check, a 1st trip DTC might not be confirmed.

With GST

1
Start engine and warm it up to normal operating temperature.
2
Set voltmeter probes between ECM terminal 12 and ground.
3
Check the following with engine speed held at 2,000 rpm constant under no load. - The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than three times within 10 seconds.

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