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Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 99

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–351

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page

ES-20

WIRING DIAGRAM

Refer to DTC P2195 (See page

ES-312

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.

Monitor runs whenever following DTCs not present

P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0171, P0172 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340, P0341 (CMP sensor)
P0455, P0456 (EVAP system)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)

Active A/F control

Performing

Active A/F control performed when following conditions met

Battery voltage

11 V or more

Engine coolant temperature

°C (167°F) or more

Idling

OFF

Engine RPM

Less than 4,000 rpm

A/F sensor status

Activated

Fuel-cut

OFF

Engine load

10 to 70 %

Shift position

2 or more

Catalyst monitor

Not yet

Intake air amount

3 to 10.5 g/sec

Response rate deterioration level

Less than 0.2 V

ES–352

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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.

•

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.

•

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

HINT:
•

DTC P2A00 or P2A03 may be also set, when the air-fuel ratio is stuck rich or lean.

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

Case

A/F Sensor (Sensor 1)

Output Voltage

HO2 Sensor (Sensor 2)

Output Voltage

Main Suspected Trouble

Area

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

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

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

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

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–353

•

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.

•

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.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS /

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read DTCs.

Result

HINT:
If any DTCs other than P2A00 or P2A03 are output,
troubleshoot those DTCs first.

NEXT

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

Display (DTC Output)

Proceed To

P2A00 and/or P2A03

P2A00 and/or P2A03 and other DTCs

GO TO DTC CHART (See page

ES-57

)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See page

ES-85

)

REPLACE AIR FUEL RATIO SENSOR (See
page

EC-21

)

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) (See page

ES-325

)

REPAIR OR REPLACE HARNESS OR
CONNECTOR

PERFORM CONFIRMATION DRIVING PATTERN

ES–354

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

(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

Replace the air fuel ratio sensor (See page

EC-21

NEXT

(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

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

Display (DTC Output)

Proceed To

P2A00 and/or P2A03

No output

CHECK FOR INTERMITTENT PROBLEMS

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

Display (DTC Output)

Proceed To

No output

P2A00 and/or P2A03

CHECK EXTREMELY RICH OR LEAN
ACTUAL AIR FUEL RATIO (REFER TO DTC
P0171 PROCEDURE)

END

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