Ht1b Toyota Wiring Diagram

Engine Room R/B Heated Oxygen Sensor (Bank 1 Sensor 2)

14 6

BR 4

Engine Room R/B G-W

3

1

l

3 )

5

2

EFI Relay m (h

+B HT1B

Heated Oxygen Sensor (Bank 2 Sensor 2)

BR 4

+B HT2B

E2 OX2B

Engine Room R/B

Engine Room R/B

Battery

J12 J/C

33 5

HT1B

OX1B

HT2B

OX2B

MREL

*1: Shielded

A115934E01

CONFIRMATION DRIVING PATTERN

HINT:

• This confirmation driving pattern is used in the "PERFORM CONFIRMATION DRIVING PATTERN" procedure of the following diagnostic troubleshooting procedure.

• Performing this confirmation driving pattern will activate the Heated Oxygen (HO2) sensor monitor. (The catalyst monitor is performed simultaneously.) This is very useful for verifying the completion of a repair.

NOTICE:

This test will not be completed if the vehicle is driven under absolutely constant speed conditions such as with cruise control activated.

Vehicle Speed

This test will not be completed if the vehicle is driven under absolutely

Between 40 and 70 mph _ (64 and 113 km/h )

(h) (h)

constant speed, such as with cruise control activated.

Idling

(g)

/

Ignition Switch ON

Time

Warm up

10 minutes

(Note: Even when vehicle stops during driving pattern, test can be

resumed.)

P

A115372E19

READINESS TESTS

MISFIRE MON

AVAIL

FUEL SYS MON

AVAIL

COMP MON

AVAIL

CAT EVAL

INCMPL

HTD CAT EVAL

N/A

EVAP EVAL

INCMPL

2nd AIR EVAL

N/A

A/C EVAL

N/A

02S EVAL

INCMPL

02S HTR EVAL

INCMPL

EGR EVAL

(a) Connect an intelligent tester to the DLC3.

(b) Turn the ignition switch ON.

(e) Select the following menu items: DIAGNOSIS / CARB OBD II / READINESS TESTS.

(f) Check that O2S EVAL is INCMPL (incomplete).

(g) Start the engine and warm it up.

(h) Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes.

(i) Note the state of the Readiness Tests items. Those items will change to COMPL (complete) as O2S EVAL monitor operates.

(j) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES

and check if any DTCs (any pending DTCs) are set.

HINT:

If O2S EVAL does not change to COMPL, and any pending DTCs fail to set, extend the driving time. HINT:

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 an intelligent tester.

(1) Connect an intelligent tester to the DLC3.

(2) Start the engine and turn the tester ON.

(3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.

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

(5) 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).

(6) 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:

• The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection volume by 25 %.

• Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Standard

Tester Display (Sensor)

Injection Volumes

Status

Voltages

AFS B1S1 or AFS B2S1 (A/F)

+25 %

Rich

Less than 3.0

AFS B1S1 or AFS B2S1 (A/F)

-12.5 %

Lean

More than 3.35

O2S B1S2 or O2S B2S2 (HO2)

+25 %

Rich

More than 0.55

O2S B1S2 or O2S B2S2 (HO2)

-12.5 %

Lean

Less than 0.4

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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