DTC P0030 A/F/O2 Heater Control Circuit Bank 1 Sensor 1: Notes
WARNING: This page is about a different variant/trim than selected.
DTC detecting condition:
Detected when two consecutive driving cycles with fault occur.
CAUTION:
- After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode .
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .
- CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.
- Start and warm up the engine.
- Turn the ignition switch to OFF.
- Disconnect the connectors from front oxygen (A/F) sensor.
- Disconnect the connector from ECM.
- Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.
Connector & terminal
(B136) No. 5 - (E24) No. 1: Oxygen sensor heater characteristic (bank 1 sensor 1)
(B136) No. 19 - (E24) No. 3:
(B136) No. 18 - (E24) No. 4:
Is the resistance less than 1 Ω?
- Yes: Go to 2.
- No: repair the harness and connector.NOTE: In this case, repair the following item:
- Open circuit in harness between ECM connector and front oxygen (A/F) sensor connector
- Poor contact of coupling connector
- CHECK FRONT OXYGEN (A/F) SENSOR.
Measure the resistance between front oxygen (A/F) sensor terminals.
Terminals
No. 1 -No. 2:
Is the resistance 2 - 3 Ω?
- Yes: Go to 3.
- No: Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Front Oxygen (A/F) Sensor .
- CHECK FOR POOR CONTACT.
Check for poor contact of ECM and front oxygen (A/F) sensor connector.
Is there poor contact of ECM or front oxygen (A/F) sensor connector?
- Yes: Repair the poor contact of ECM or front oxygen (A/F) sensor connector.
- No: Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Front Oxygen (A/F) Sensor .