Toyota Sequoia (2005). Manual - part 148

–

DIAGNOSTICS

ENGINE

DI–387

581

MONITOR STRATEGY

P2195

A/F sensor (Bank 1) signal stuck lean

P2195

A/F sensor (Bank 1) current (high side)

P2196

A/F sensor (Bank 1) signal stuck rich

R l t d DTC

P2196

A/F sensor (Bank 1) current (low side)

Related DTCs

P2197

A/F sensor (Bank 2) signal stuck lean

P2197

A/F sensor (Bank 2) current (high side)

P2198

A/F sensor (Bank 2) signal stuck rich

P2198

A/F sensor (Bank 2) current (low side)

Required sensors/components

A/F sensor

Frequency of operation

Once per driving cycle

Duration

15 sec.: A/F sensor signal stuck lean/rich
3 sec.: A/F sensor current (high/low side)

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present

See page 

DI–18

P2195, P2197 (A/F sensor signal stuck lean):

Duration while all of following conditions
met

2 sec.

–

Rear HO2S voltage

0.15 V

–

Time after engine start

30 sec.

–

A/F sensor status

Activated

Fuel system status

Closed–loop

Engine

Running

P2196, P2198 (A/F sensor signal stuck rich):

Duration while all of following conditions
met

2 sec.

–

Rear HO2S voltage

–

0.6 V

Time after engine start

30 sec.

–

A/F sensor status

Activated

Fuel system status

Closed–loop

Engine

Running

P2195, P2197 (A/F sensor current (High side)):

Battery voltage

11 V

–

ECT

75

°

C (167

°

F)

–

Atmospheric pressure/760 mmHg

0.75

–

A/F sensor status

Activated

Continuous time of fuel–cut

3 to 10 sec.

P2196, P2198 (A/F sensor current (Low side)):

Battery voltage

11 V

–

ECT

75

°

C (167

°

F)

–

DI–388

–

DIAGNOSTICS

ENGINE

582

Atmospheric pressure/760 mmHg

0.75

–

A/F sensor status

Activated

Continuous time of fuel–cut

3 to 10 sec.

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

P2195, P2197 (A/F sensor signal stuck lean):

A/F sensor voltage

More than 3.8 V for 15 sec.

P2196, P2198 (A/F sensor signal stuck rich):

A/F sensor voltage

Less than 2.8 V for 15 sec.

P2195, P2197 (A/F sensor current (High side)):

Duration of the following condition

3 sec. or more

A/F sensor current

3.6 mA or more

P2196, P2198 (A/F sensor current (Low side)):

Duration of the following condition

3 sec. or more

A/F sensor current

Less than 1.4 mA

MONITOR RESULT

Refer to page 

DI–26

 for detailed information.

The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (refer to ”Confirmation Monitor”).

MID (Monitor Identification Data) is assigned to each emissions–related component.

TID (Test Identification Data) is assigned to each test value.

A/F sensor bank 1 sensor 1

MID

TID

Scaling

Description of Test Value

Minimum Test Limit

Maximum Test Limit

$01

$91

Multiply by 0.003906

(mA)

A/F current

Minimum test limit

Maximum test limit

A/F sensor bank 2 sensor 1

MID

TID

Scaling

Description of Test Value

Minimum Test Limit

Maximum Test Limit

$05

$91

Multiply by 0.003906

(mA)

A/F current

Minimum test limit

Maximum test limit

A23547

2

A1A–

MREL

HA2A

A1A+

ECM

22

30

B–W

E4

E7

E7

E7

BR

W–B

2

EFI Relay

A39 A/F Sensor 
(Bank 2 Sensor 1)

J42 
J/C

Engine Room R/B No. 2

W

1

14

F10
FL 
Block

Battery

ED

(Shielded)

8

EB

3

2

HT

AF+

+B

B

E7

7

E04

2

IA4

5

L–R

G–R

2

G–B

2

B

1

B

1

4

BR

B–W

W–B

2F

A/F

1

1

1

2

Engine Room R/B and J/B

2D

2A

2H

2

6

EFI No. 1

EFI No. 2

2

2

W–B

A/F Relay

1

2

3

5

A

A

J2
J/C

G–R

15

IA5

1

IG4

(Shielded)

G

R

EC

E

E

C

C

C

J42 
J/C

J5 
J/C

J2 
J/C

B

B

5

Engine
Room
R/B No. 2

R–W

R–W

R–W

R–W

A38 A/F Sensor 
(Bank 1 Sensor 1)

+B

AF–

HT

AF+

AF–

1

3

2

4

1

3

2

4

R–W

L

31

E7

23

E7

E7

A2A+

A2A–

HA1A

B

R/B

–

DIAGNOSTICS

ENGINE

DI–389

583

WIRING DIAGRAM

A23662

40 mph (64 km/h)

Idling

IG SW OFF

ECT: 

75



C (167



F) or higher

Vehicle Speed

Warming up

(d)

(f)

10 minutes
or more

(g)

10 seconds
or more

4 seconds
or more

Time

At Least 3 times

(h)

(i)

(j)

Accelerator Pedal
Depressed

Accelerator Pedal 
Released (Fuel–cut)

DI–390

–

DIAGNOSTICS

ENGINE

584

CONFIRMATION DRIVING PATTERN

HINT:
This confirmation driving pattern is used in steps 2, 4, 7, 17 and 21 of the following diagnostic troubleshooting
procedure when using a hand–held tester.

(a)

Connect the hand–held tester to DLC3.

(b)

Turn the ignition switch to ON and turn the tester ON.

(c)

Clear DTCs (see page 

DI–43

).

(d)

Start the engine, and warm it up until the ECT reaches 75



C (167



F) or higher.

(e)

On the hand–held tester, select the following menu items: DIAGNOSIS/ENHANCED OBD II/DATA
LIST/FC IDL.

(f)

Drive the vehicle at 40 mph (64 km/h) or more for at least 10 minutes.

(g)

Change the transmission to 2nd gear.

(h)

Drive the vehicle at proper vehicle speed to perform fuel–cut operation.

HINT:
Fuel–cut is performed under following conditions met:

Accelerator pedal fully released.

Engine speed 2,500 rpm or more (fuel injection returns at 1,000 rpm).

(i)

Accelerate the vehicle to 30 mph (48 km/h) or more by depressing the accelerator pedal for at least
10 seconds.

(j)

Soon after performing step (8) above, release the accelerator pedal for at least 4 seconds without de-
pressing the brake pedal, in order to execute fuel–cut control.

(k)

Stop the vehicle and allow the engine to idle for 10 seconds or more.

(l)

Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h).

(m)

Repeat steps from (8) through (10) above at least 3 times in one driving cycle.

HINT:
Completing all A/F sensor monitors are required to change the value in TEST RESULT.
CAUTION:
Strictly observe of posted speed limits, traffic laws, and road conditions when performing these
drive pattern.