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Toyota Sienna Service Manual: Oxygen (A/F) Sensor Pumping Current Circuit

Oxygen (A/F) Sensor Pumping Current Circuit

HINT:

DESCRIPTION

Refer to DTC P2195 (See page ES-355).

DESCRIPTION

DESCRIPTION

HINT:

MONITOR DESCRIPTION

The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the ECM determines that there is an open or short malfunction in the A/F sensor circuit.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Refer to DTC P2195 (See page ES-359).

INSPECTION PROCEDURE

HINT:

For use of the intelligent tester only: Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using the intelligent tester.

(a) Connect the intelligent tester to the DLC3.

(b) Start the engine and turn the tester on.

(c) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.

(d) Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/ F CONTROL.

(e) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).

(f) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2) displayed on the tester.

HINT

Standard voltage

NOTICE: The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.

INSPECTION PROCEDURE

INSPECTION PROCEDURE

HINT:

1 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Disconnect the A5 or A6 A/F sensor connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

(c) Reconnect the A/F sensor connector.

Result

2 INSPECT RELAY (A/F RELAY)

INSPECT RELAY (A/F RELAY)

(a) Remove the A/F relay from the No. 6 engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

(c) Reinstall the A/F relay.

3 CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

(a) Disconnect the A5 or A6 A/F sensor connector.

(b) Turn the ignition switch to the ON position.

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage

(d) Turn the ignition switch off.

(e) Disconnect the E10 ECM connector.

(f) Measure the resistance according to the value(s) in the table below.

Standard resistance :

(g) Reconnect the ECM connector.

(h) Reconnect the A/F sensor connector.

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

REPLACE ECM (See page ES-498)

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