Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 34

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–91

ES

TYPICAL MALFUNCTION THRESHOLDS

P0037 and P0057:

P0038 and P0058:

P0141 and P0161 (Heater performance monitor check):

COMPONENT OPERATING RANGE

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page 

ES-20

).

WIRING DIAGRAM

Refer to DTC P0136 (See page 

ES-140

).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. The ECM records vehicle and driving condition 
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data 
can be helpful in determining whether the vehicle was running or stopped, whether the engine was 
warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of 
a malfunction.

(a) Disconnect the B36*1 or B34*2 Heated Oxygen (HO2) 

sensor connectors.
HINT:
•

*1: Bank 1 Sensor 2

•

*2: Bank 2 Sensor 2

(b) Measure the resistance between the terminals of the 

HO2 sensor connector.
Standard Resistance (Bank 1 Sensor 2)

Standard Resistance (Bank 2 Sensor 2)

(c) Reconnect the HO2 sensor connector.

Heater current

Less than 0.3 A

One of the following conditions is met:

Condition A or B

A. Learned heater OFF current

More than 2 A

B. Heater current

2 A or more

Accumulated heater resistance

Varies with sensor element temperature (Example: More than 23 ohm)

Heated Oxygen (HO2) sensor heater current

0.4 to 1 A (when engine idles, HO2 sensor warmed up and battery 
voltage 11 to 14 V)

1

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

Component Side:

HO2 Sensor

Front View

B36
B34

*1
*2

+B

E2

HT1B

HT2B

OX1B

OX2B

*1: Bank 1

*2: Bank 2

*1

*2

*1

*2

A133485E01

Tester Connections

Specified Conditions

HT1B (1) - +B (2)

11 to 16 

Ω at 20°C (68°F)

HT1B (1) - E2 (4)

10 k

Ω or higher

Tester Connections

Specified Conditions

HT2B (1) - +B (2)

11 to 16 

Ω at 20°C (68°F)

HT2B (1) - E2 (4)

10 k

Ω or higher

ES–92

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

NG

OK

(a) Remove the EFI relay from the engine room relay block.
(b) Check the EFI relay resistance.

Standard Resistance

(c) Reinstall the EFI relay.

NG

OK

(a) Turn the ignition switch ON.
(b) Measure the voltage between the terminals of the ECM 

connectors.
Standard Resistance

HINT:
•

The HT1B means the heated oxygen sensor bank 1 
sensor 2.

•

The HT2B means the heated oxygen sensor bank 2 
sensor 2.

OK

NG

REPLACE HEATED OXYGEN SENSOR (See 
page 

EC-24

)

2

INSPECT EFI RELAY

1

2

5

3

EFI Relay

A133434E03

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

3

INSPECT ECM (HT1B OR HT2B VOLTAGE)

E1 (-)

HT1B (+)

ECM Connector

B2

B3

B1

HT2B (+)

A115970E21

Terminal Connections 

Specified Conditions

HT1B (B1-1) - E1 (B3-1)

11 to 14 V

HT2B (B2-5) - E1 (B3-1)

REPLACE ECM (See page 

ES-446

)

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–93

ES

(a) Check the harness and connector between the HO2 

sensor and EFI No. 2 fuse.
(1) Disconnect the B36*1 or B34*2 HO2 sensor 

connector.
HINT:
•

*1: Bank 1 Sensor 2

•

*2: Bank 2 Sensor 2

(2) Remove the EFI No. 2 fuse from the engine room R/

B.

(3) Check the resistance.

Standard Resistance

Standard Resistance

(4) Reconnect the HO2 sensor connector.
(5) Reconnect the EFI No. 2 fuse.

NG

OK

4

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - EFI NO. 2 FUSE)

Wire Harness Side:

HO2 Sensor Connector

Bank 1

Bank 2

+B

Front View

EFI No. 2

Engine Room R/B

B36

B34

1

2

A133484E01

Terminal Connections

Specified Conditions

+B (B36-2) - EFI No. 2 fuse (2)

Below 1 

Ω

+B (B34-2) - EFI No. 2 fuse (2)

Terminal Connections

Specified Conditions

+B (B36-2) or EFI No. 2 fuse (2) - Body ground

10 k

Ω or higher

+B (B34-2) or EFI No. 2 fuse (2) - Body ground

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

ES–94

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(a) Check the harness and connector between the ECM and 

HO2 sensor.
(1) Disconnect the B36*1 or B34*2 HO2 sensor 

connector.
HINT:
•

*1: Bank 1 Sensor 2

•

*2: Bank 2 Sensor 2

(2) Remove the B1 and B2 ECM connector.
(3) Check the resistance.

Standard Resistance

Standard Resistance

(4) Reconnect the HO2 sensor connector.
(5) Reconnect the ECM connector.

NG

OK

5

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

*1

*2

+B

HT1B *1
HT2B *2

*1: Bank 1
*2: Bank 2

Wire Harness Side:

HO2 Sensor Connector

ECM Connector

B1

B2

HT2B

HT1B

B36

B34

Front View

A133482E01

Terminal Connections

Specified Conditions

HT1B (B36-1) - HT1B (B1-1)

Below 1 

Ω

HT2B (B34-1) - HT2B (B2-5)

Terminal Connections

Specified Conditions

HT1B (B36-1) or HT1B (B1-1) - Body ground

10 k

Ω or higher

HT2B (B34-1) or HT2B (B2-5) - Body ground

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

REPLACE ECM (See page 

ES-446

)