Subaru Crosstrek Service Manual: Dtc p0030 a/f / o2 heater control circuit bank 1 sensor 1

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0030 a/f / o2 heater control circuit bank 1 sensor 1

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

DTC P0030 A/F / O2 HEATER CONTROL CIRCUIT BANK 1 SENSOR 1

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

Wiring diagram:

Engine electrical system Engine Electrical System">

STEP	CHECK	YES	NO

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

1) Start and warm up the engine.

2) Turn the ignition switch to OFF.

3) Disconnect the connector from ECM.

4) Disconnect the connectors from front oxygen (A/F) sensor.

5) Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

Connector & terminal

(B136) No. 5 — (E24) No. 1:

(B136) No. 19 — (E24) No. 3:

(B136) No. 18 — (E24) No. 4:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0030 A/F / O2 HEATER CONTROL CIRCUIT BANK 1 SENSOR 1">Go to Step 2.

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

2.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 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0030 A/F / O2 HEATER CONTROL CIRCUIT BANK 1 SENSOR 1">Go to Step 3.

Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor">

3.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?

Repair the poor contact of ECM or front oxygen (A/F) sensor connector.

Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor">

1. OUTLINE OF DIAGNOSIS

Detect functional errors of the front oxygen (A/F) sensor heater.

Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large when looking at engine status such as deceleration fuel cut.

2. COMPONENT DESCRIPTION

(1)	Element cover (outer)	(3)	Sensor element	(4)	Sensor housing
(2)	Element cover (inner)

3. EXECUTION CONDITION

Secondary parameters	Execution condition
Battery voltage	≥ 10.9 V
A/F sensor heater control duty	> 17 %
Elapsed time after fuel cut	≥ 20000 ms

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after 42000 ms seconds or more have passed since the engine started.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
Front oxygen (A/F) sensor impedance	> 82 ?

Time Needed for Diagnosis: 10000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Dtc p0024 "b" camshaft position - timing over-advanced or system performance bank 2

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0024 "B" CAMSHAFT POSITION - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE BANK 2DTC detecting condit ...

Dtc p0031 a/f / o2 heater control circuit low bank 1 sensor 1

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0031 A/F / O2 HEATER CONTROL CIRCUIT LOW BANK 1 SENSOR 1DTC DETECTING CONDITION:Immediately at fault recogni ...

Other materials:

Inspection
Blind Spot Detection/Rear Cross Traffic Alert (DIAGNOSTICS) > General DescriptionINSPECTION1. BASIC INSPECTIONBefore performing diagnosis, check the following items that might provoke the problems related to BSD/RCTA.1. Check the battery. Battery">2. Check the relay and fuse condition. ...

Dtc c0026 rear right abs sensor signal
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC C0026 REAR RIGHT ABS SENSOR SIGNALNOTE:For the diagnostic procedure, refer to “DTC C0028 REAR LEFT ABS SENSOR SIGNAL”. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > ...

Access key - if access key does not operate properly
CAUTION Keep metallic objects, magnetic sources and signal transmitters away from the area between the access key and the push-button ignition switch. They may interfere with the communication between the access key and the push-button ignition switch. The following functions may be inopera ...