Toyota Tundra (2015 year). Manual — part 1108

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7.

CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTC

.

(e) Start the engine and warm it up.

(f) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(g) Read the output pending DTCs using the Techstream.

OK:

No pending DTC is output.

NG

GO TO DTC CHART

OK

END

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0016-P0019;...

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000000WC10X8X

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032,P0051,P0052,P101D,P103D; Oxygen

(A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); 2015 MY Tundra [08/2014 - ]

DTC

P0031

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)

DTC

P0032

Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)

DTC

P0051

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 2 Sensor 1)

DTC

P0052

Oxygen (A/F) Sensor Heater Control Circuit High (Bank 2 Sensor 1)

DTC

P101D

A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON

DTC

P103D

A/F Sensor Heater Circuit Performance Bank 2 Sensor 1 Stuck ON

DESCRIPTION

Refer to DTC P2195

.

HINT:

DTC

NO.

DTC DETECTION CONDITION

TROUBLE AREA

P0031

P0051

Air-Fuel Ratio (A/F) sensor heater current is less than 0.8 A

(1 trip detection logic)

Open in A/F sensor heater

circuit

A/F sensor heater (for

Sensor 1)

Integration relay

ECM

P0032

P0052

Air-Fuel Ratio (A/F) sensor heater current failure

(1 trip detection logic)

Short in A/F sensor heater

circuit

A/F sensor heater (for

Sensor 1)

Integration relay

ECM

P101D

P103D

The heater current is higher than the specified value while the

heater is not operating (1 trip detection logic).

Open or short in A/F

sensor heater circuit

ECM

MONITOR DESCRIPTION

The ECM uses information from the Air-Fuel Ratio (A/F) sensor to regulate the air-fuel ratio and keep it close to

The A/F sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner

element.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032,...

The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations

between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.

The A/F sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot

generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating

using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is

outside the normal range, the signal transmitted by the A/F sensor becomes inaccurate. As a result, the ECM is

unable to regulate the air-fuel ratio properly.

When the current in the A/F sensor heater is outside the normal operating range, the ECM interprets this as a

malfunction in the sensor heater and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0031: A/F sensor heater (for Bank 1) open/short (Low electrical

current)

P0032: A/F sensor heater (for Bank 1) open/short (High electrical

current)

P0051: A/F sensor heater (for Bank 2) open/short (Low electrical

current)

P0052: A/F sensor heater (for Bank 2) open/short (High electrical

current)

P101D: A/F sensor heater (for Bank 1) performance

P103D: A/F sensor heater (for Bank 2) performance

Required Sensors/Components (Main)

A/F sensor heater

Required Sensors/Components

(Related)

-

Duration

10 seconds: P0031 and P0051

10.24 seconds: P0032 and P0052

1 second: P101D and P103D

MIL Operation

Immediate

TYPICAL ENABLING CONDITIONS

P0031 and P0051

Monitor runs whenever following DTCs not stored

P101D, P103D (Air fuel ratio sensor heater)

Battery voltage

10.5 V or higher

Time after heater on

5 seconds or more

Active heater OFF control

Not operating

Active heater ON control

Not operating

Air fuel ratio sensor heater duty-cycle

10% or more

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0031,P0032,...