Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 66

 

  Index      Toyota     Toyota FJ Cruiser (model GSJ 10, 15 series) - service repair instruction 2007 year

 

Search            copyright infringement  

 

 

 

 

 

 

 

  

 

Content   ..  64  65  66  67   ..

 

 

Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 66

 

 

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–219

ES

INSPECTION PROCEDURE

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

Voltage output when active air-fuel ratio control not performed

Normal Catalyst

Deteriorated Catalyst

Waveform of 
HO2 Sensor 
behind TWC

Waveform of 
A/F Sensor in 
front of TWC

3.5 V

3.0 V

1.0 V

0 V

10 seconds

10 seconds

A121610E01

ES–220

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

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.

•

Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of 
both the A/F and HO2 sensors.

•

To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II 
/ ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S 
B2S2, and press the YES button and then the ENTER button followed by the F4 button.

HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when 
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was 
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other 
data, from the time the malfunction occurred.

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(d) Read DTCs.

Result

Case

A/F Sensor (Sensor 1)

Output Voltage

HO2 Sensor (Sensor 2)

Output Voltage

Main Suspected

Trouble Areas

1

Injection volume

+25 %

-12.5 %

Injection volume

+25 %

-12.5 %

-

Output voltage

More than 3.35 V

Less than 3.0 V

Output voltage

More than 0.55 V

Less than 0.4 V

2

Injection volume

+25 %

-12.5 %

Injection volume

+25 %

-12.5 %

•

A/F sensor

•

A/F sensor heater

•

A/F sensor circuit

Output voltage

Almost 

no reaction

Output voltage

More than 0.55 V

Less than 0.4 V

3

Injection volume

+25 %

-12.5 %

Injection volume

+25 %

-12.5 %

•

HO2 sensor

•

HO2 sensor heater

•

HO2 sensor circuit

Output voltage

More than 3.35 V

Less than 3.0 V

Output voltage

Almost 

no reaction

4

Injection volume

+25 %

-12.5 %

Injection volume

+25 %

-12.5 %

•

Injector

•

Fuel pressure

•

Gas leakage from 
exhaust system

(Air-fuel ratio extremely 
lean or rich)

Output voltage

Almost 

no reaction

Output voltage

Almost 

no reaction

1

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430)

Display (DTC Output)

Proceed To

P0420 and/or P0430

A

P0420 and/or P0430 and other DTCs

B

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–221

ES

HINT:
If any DTCs other than P0420 or P0430 are output, 
troubleshoot those DTCs first.

B

A

(a) Connect an intelligent tester to the DLC3.
(b) Start the engine and turn the tester ON.
(c) Warm up the engine at an engine speed of 2,500 rpm for 

approximately 90 seconds.

(d) Select the following menu items: 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:
•

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

Result

GO TO DTC CHART (See page 

ES-57

)

2

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (A/F CONTROL)

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

Status

AFS B1S1

or

AFS B2S1

Status

O2S B1S2

or

O2S B2S2

A/F Condition and A/F and

HO2 Sensors Conditions

Misfires

Main Suspected Trouble Areas

Proceed 

To

Lean/Rich

Lean/Rich

Normal

-

•

Three-Way Catalytic Converter (TWC)

•

Gas leakage from exhaust system

A

Lean

Lean/Rich

A/F sensor malfunction

-

•

A/F sensor

B

Rich

Lean/Rich

A/F sensor malfunction

-

•

A/F sensor

Lean/Rich

Lean

HO2 sensor malfunction

-

•

HO2 sensor

•

Gas leakage from exhaust system

C

Lean/Rich

Rich

HO2 sensor malfunction

-

•

HO2 sensor

•

Gas leakage from exhaust system

ES–222

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

Lean: During A/F CONTROL, the A/F sensor output 
voltage (AFS) is consistently more than 3.35 V, and 
the HO2 sensor output voltage (O2S) is consistently 
less than 0.4 V.
Rich: During A/F CONTROL, the AFS is consistently 
less than 3.0 V, and the O2S is consistently more than 
0.55 V.
Lean/Rich: During A/F CONTROL of the ACTIVE 
TEST, the output voltage of the HO2 sensor 
alternates correctly.

B

C

A

OK:

No gas leakage.

NG

OK

Lean

Lean

Actual air-fuel ratio lean

May occur

•

Extremely rich or lean actual air-fuel 
ratio

•

Gas leakage from exhaust system

A

Rich

Rich

Actual air-fuel ratio rich

-

•

Extremely rich or lean actual air-fuel 
ratio

•

Gas leakage from exhaust system

Status

AFS B1S1

or

AFS B2S1

Status

O2S B1S2

or

O2S B2S2

A/F Condition and A/F and

HO2 Sensors Conditions

Misfires

Main Suspected Trouble Areas

Proceed 

To

CHECK AND REPLACE AIR FUEL RATIO 
SENSOR

CHECK AND REPLACE HEATED OXYGEN 
SENSOR, AND CHECK AND REPAIR 
EXHAUST GAS LEAKAGE

3

CHECK FOR EXHAUST GAS LEAKAGE

REPAIR OR REPLACE EXHAUST GAS 
LEAKAGE POINT

REPLACE THREE-WAY CATALYTIC CONVERTER

 

 

 

 

 

 

 

Content   ..  64  65  66  67   ..