Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 49

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–151

ES

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

B

A

Replace the heated oxygen sensor (See page 

EC-24

).

NEXT

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

B

A

8

PERFORM CONFIRMATION DRIVING PATTERN

9

CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0156)

Display (DTC Output)

Proceed To

P0136 or P0156

A

No output

B

CHECK FOR INTERMITTENT PROBLEMS

10

REPLACE HEATED OXYGEN SENSOR

11

PERFORM CONFIRMATION DRIVING PATTERN

12

CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0156)

Display (DTC Output)

Proceed To

P0136 or P0156

A

No output

B

REPAIR COMPLETED

ES–152

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(a) Connect an intelligent tester to the DLC3.
(b) Start the engine and turn the tester ON.
(c) Warm up the engine.
(d) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / ACTIVE TEST / INJ VOL.

(e) Change the fuel injection volume using the tester, 

monitoring the voltage output of Air-Fuel Ratio (A/F) and 
HO2 sensors displayed on the tester.
HINT:
•

Change the fuel injection volume within the range of -
12 % and +12 %. The injection volume can be 
changed in 1 % graduations within the range.

•

The A/F sensor is displayed as AFS B1S1 or AFS 
B2S1, and the HO2 sensor is displayed as O2S B1S2 
or O2S B2S2, on intelligent testers.

Result

HINT:
A normal HO2 sensor voltage (O2S B1S2 or O2S B2S2) 
reacts in accordance with increases and decreases in 
fuel injection volumes. When the A/F sensor voltage 
remains at either less or more than 3.3 V despite the 
HO2 sensor indicating a normal reaction, the A/F sensor 
is malfunctioning.

13

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION VOLUME)

Tester Display (Sensor)

Voltage Variations

Proceed To

AFS B1S1 (A/F)
AFS B2S1 (A/F)

Alternates between more and less than 3.3 V

OK

AFS B1S1 (A/F)
AFS B2S1 (A/F)

Remains at more than 3.3 V

NG

AFS B1S1 (A/F)
AFS B2S1 (A/F)

Remains at less than 3.3 V

NG

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–153

ES

NG

OK

OK:

No gas leakage.

NG

OK

3.3 V

+12 %

-12 %

1 V

0 V

Malfunction

Malfunction

Injection Volume

HO2 Sensor Output

A/F Sensor 
Output

Normal

A121606E01

REPLACE AIR FUEL RATIO SENSOR (See 
page 

EC-21

)

CHECK AND REPAIR EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (INJECTOR, FUEL 
PRESSURE, GAS LEAKAGE FROM EXHAUST SYSTEM, ETC.)

14

CHECK EXHAUST GAS LEAKAGE

REPAIR OR REPLACE EXHAUST GAS 
LEAKAGE POINT

ES–154

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(a) Disconnect the B34 or B36 HO2 sensor connector.
(b) Measure the resistance between the terminals of the 

HO2 sensor connector.
Standard Resistance

(c) Reconnect the HO2 sensor connector.

NG

OK

(a) Remove the EFI relay from the engine room R/B.
(b) Check the EFI relay resistance.

Standard Resistance

(c) Reinstall the EFI relay.

NG

OK

15

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

Component Side:

HO2 Sensor

+B

HT1B or HT2B

B36

1

2

3

4

Bank 2

Bank 1

E2

B34

Front View

A062378E39

Tester Connections

Specified Conditions

HT1B or HT2B (1) - +B (2)

11 to 16 

Ω at 20°C (68°F)

HT1B or HT2B (1) - E2 (4)

10 k

Ω or higher

REPLACE HEATED OXYGEN SENSOR (See 
page 

EC-24

)

16

INSPECT EFI RELAY

B016200E02

Terminal 

Connections

Specified Conditions

3 - 5

10 k

Ω or higher

Below 1 

Ω

(when battery voltage applied to terminals 1 and 2)

REPLACE EFI RELAY