Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 91

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–319

ES

(i) Drive the vehicle at proper vehicle speed to perform fuel-cut operation (refer to the following HINT).
HINT:
Fuel-cut is performed when the following conditions are met:
•

Accelerator pedal fully released.

•

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

(j) Accelerate the vehicle to 40 mph (64 km/h) or more by depressing the accelerator pedal for at least 10
seconds.
(k) Soon after performing step (j) above, release the accelerator pedal for at least 4 seconds without
depressing the brake pedal, in order to execute fuel-cut control.
(l) Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h).
(m) Repeat steps from (h) through (k) above at least 3 times in one driving cycle.
HINT:
Completion of all A/F sensor monitors is required to change the value in TEST RESULT.
CAUTION:
Strictly observe posted speed limits, traffic laws, and road conditions when performing these
drive patterns.

INSPECTION PROCEDURE

HINT:
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

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.

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

ES–320

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

•

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 low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would
cause the engine to run rich.

•

A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would
cause the engine to run lean.

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

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read DTCs.

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 P2195, P2196, P2197 OR P2198)

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–321

ES

Result

HINT:
If any DTCs other than P2195, P2196, P2197 or P2198
are output, troubleshoot those DTCs first.

B

A

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear DTCs (See page

ES-38

).

(d) Allow the vehicle to drive in accordance with the drive

pattern described in the CONFIRMATION DRIVING
PATTERN.

(e) Select the following menu items on the tester:

DIAGNOSIS / ENHANCED OBD II / MONITOR INFO /
MONITOR STATUS.

(f)

Check that the status of O2S MON is COMPL.
If the status is still INCMPL, drive the vehicle according
to the driving pattern again.
HINT:
•

AVAIL indicates that the component has not been
monitored yet.

•

COMPL indicates that the component is functioning
normally.

•

INCMPL indicates that the component is
malfunctioning.

(g) Select the following menu items: DIAGNOSIS /

ENHANCED OBD II / MONITOR INFO / TEST RESULT /
RANGE B1S1, then press the ENTER button.

(h) Check the test value of the A/F sensor output current

during fuel-cut.

Result

B

A

(a) Connect an intelligent tester to the DLC3.
(b) Start the engine.
(c) Turn the tester ON.

Display (DTC Output)

Proceed To

P2195, P2196, P2197 or P2198

A

P2195, P2196, P2197 or P2198 and other DTCs

B

GO TO DTC CHART (See page

ES-57

)

2

READ VALUE USING INTELLIGENT TESTER (TEST VALUE OF A/F SENSOR)

Test Value

Proceed To

Within normal range (1.4 mA or more, and less than 3.6 mA)

A

Outside normal range (Less than 1.4 mA, or 3.6 mA or more)

B

Go to step 20

3

READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF A/F SENSOR)

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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

(d) Warm up the Air-Fuel Ratio (A/F) sensor at an engine

speed of 2,500 rpm for 90 seconds.

(e) Select the following menu items: DIAGNOSIS /

ENHANCED OBD II / SNAPSHOT / MANUAL
SNAPSHOT / USER DATA / AFS B1S1 or AFS B2S1
and ENGINE SPD.

(f)

Check the A/F sensor voltage three times, when the
engine is in each of the following conditions:
(1) While idling (check for at least 30 seconds)
(2) At an engine speed of approximately 2,500 rpm

(without any sudden changes in engine speed)

(3) Raise the engine speed to 4,000 rpm and then

quickly release the accelerator pedal so that the
throttle valve is fully closed.

Standard

HINT:
For more information, see the diagrams below.

HINT:
•

If the output voltage of the A/F sensor remains at
approximately 3.3 V (see Malfunction Condition diagram)
under any conditions, including those above, the A/F
sensor may have an open circuit. (This will also happen if
the A/F sensor heater has an open circuit.)

•

If the output voltage of the A/F sensor remains at either
approximately 3.8 V or more, or 2.8 V or less (see
Malfunction Condition diagram) under any conditions,
including those above, the A/F sensor may have a short
circuit.

Conditions

A/F Sensor Voltage Variations

Reference

(1) and (2)

Changes at approximately 3.3 V

Between 3.1 V and 3.5 V

(3)

Increases to 3.8 V or more

This occurs during engine deceleration
(when fuel-cut performed)

Normal Condition:

Engine RPM

A/F Sensor
Voltage

"Condition (3)"
3.8 V or more

"Condition (1), (2)"
Change at approximately 3.3 V

Fuel-cut

(1) Idling

(1) Idling

(2) Approximately 2,500 rpm

(3) Approximately 4,000 rpm

Malfunction Condition:

Engine RPM

A/F Sensor
Voltage

When A/F sensor circuit malfunctioning,
voltage output does not change

Fuel-cut

(1) Idling

(1) Idling

(2) Approximately 2,500 rpm

(3) Approximately 4,000 rpm

A107161E01