ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.

1) Turn the ignition switch to OFF.

2) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 1 (+) — Chassis ground (−):

(B134) No. 2 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the short circuit to power in the harness between the ECM and front oxygen (A/F) sensor connector.

2.CHECK GROUND CIRCUIT FOR ECM.

1) Disconnect the connectors from the ECM.

2) Measure the resistance between ECM and chassis ground.

Connector & terminal

(B134) No. 3 — Chassis ground:

(B134) No. 4 — Chassis ground:

Is the resistance less than 5 Ω?

Repair the poor contact of the ECM connector.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and engine ground

• Poor contact of coupling connector