Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 52

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–163

ES

C

A

(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 / DATA LIST / PRIMARY / 
COOLANT TEMP.

(d) Read the COOLANT TEMP twice, when the engine is 

both cold and warmed up.
Standard:

With cold engine: Same as ambient air 
temperature.
With warm engine: 80

°C to 100°C (176°C to 212°F).

NG

OK

(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 / DATA LIST / PRIMARY / MAF and 
COOLANT TEMP.

(d) Allow the engine to idle until the COOLANT TEMP 

reaches 75

°C (167°F) or more.

(e) Read the MAF with the engine in an idling condition and 

at an engine speed of 2,500 rpm.
Standard:

MAF while engine idling: 3.2 to 4.7 g/sec (shift 
position: N, A/C: OFF).
MAF at engine speed of 2,500 rpm: 13.1 to 18.9 g/
sec (shift position: N, A/C: OFF).

NG

OK

(a) Check the fuel pressure (See page 

FU-6

).

NG

OK

              Go to step 15

5

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

REPLACE ENGINE COOLANT 
TEMPERATURE SENSOR (See page 

ES-424

)

6

READ VALUE USING INTELLIGENT TESTER (MAF)

REPLACE MASS AIR FLOW METER (See 
page 

ES-409

)

7

CHECK FUEL PRESSURE

REPAIR OR REPLACE FUEL SYSTEM

ES–164

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

OK:

No gas leakage.

NG

OK

HINT:
If the spark plugs or ignition system malfunctions, engine 
misfire may occur. The misfire count can be read using an 
intelligent tester. Select the following menu items: 
DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / 
CYL #1 (to CYL #6).

NG

OK

HINT:
If the injectors malfunction, engine misfire may occur. The 
misfire count can be read using an intelligent tester. Select 
the following menu items: DIAGNOSIS / ENHANCED OBD II 
/ DATA LIST / PRIMARY / CYL #1 (to CYL #6).

NG

OK

(a) Disconnect the B31 or B33 A/F sensor connector.
(b) Measure the resistance between the terminals of the A/F 

sensor connector.
Standard Resistance (Bank 1 Sensor 1)

Standard Resistance (Bank 2 Sensor 1)

(c) Reconnect the A/F sensor connector.

8

CHECK EXHAUST GAS LEAKAGE

REPAIR OR REPLACE EXHAUST SYSTEM

9

CHECK SPARK AND IGNITION

REPAIR OR REPLACE IGNITION SYSTEM

10

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

REPLACE FUEL INJECTOR ASSEMBLY (See 
page 

FU-11

)

11

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

A/F Sensor

+B

HA1A or HA2A

A1A- or A2A- 

Component Side:

B31

B33 Bank 1

Bank 2

Front View

A085152E56

Tester Connections

Specified Conditions

HA1A (1) - +B (2)

1.8 

Ω to 3.4 Ω at 20°C (68°F) 

HA1A (1) - A1A- (4)

10 k

Ω or higher

Tester Connections

Specified Conditions

HA2A (1) - +B (2)

1.8 

Ω to 3.4 Ω at 20°C (68°F) 

HA2A (1) - A2A- (4)

10 k

Ω or higher

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–165

ES

NG

OK

(a) Remove the A/F sensor heater relay from the engine 

room R/B.

(b) Check the A/F sensor heater relay resistance.

Standard Resistance

(c) Reinstall the A/F sensor heater relay.

NG

OK

(a) Disconnect the B31 or B33 A/F sensor connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between the +B terminal of the A/F 

sensor connector and body ground.
Standard Voltage

(d) Turn the ignition switch OFF.
(e) Disconnect the B2 ECM connector.
(f)

Check the resistance.
Standard Resistance (Check for open)

REPLACE AIR FUEL RATIO SENSOR (See 
page 

EC-21

)

12

INSPECT AIR FUEL RATIO SENSOR HEATER RELAY

B016200E02

Tester Connections

Specified Conditions

3 - 5

10 k

Ω or higher

Below 1 

Ω

(when battery voltage applied to terminals 1 and 2)

REPLACE AIR FUEL RATIO SENSOR 
HEATER RELAY

13

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

B31

Wire Harness Side:

A/F Sensor Connector

B33 Bank 1

Bank 2

Front View

+B

HA1A or HA2A

B2

ECM Connector

HA2A

HA1A

A1A+ or A2A+

A2A+

A2A-

A1A-

A1A+

A1A- or A2A-

A116153E08

Tester Connections

Specified Conditions

+B (B33-2) - Body ground

11 to 14 V

+B (B31-2) - Body ground

Tester Connections

Specified Conditions

HA1A (B33-1) - HA1A (B2-2)

Below 1 

Ω

A1A+ (B33-3) - A1A+ (B2-22)

A1A- (B33-4) - A1A- (B2-30)

HA2A (B31-1) - HA2A (B2-1)

A2A+ (B31-3) - A2A+ (B2-23)

A2A- (B31-4) - A2A- (B2-31)

ES–166

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

Standard Resistance (Check for short)

(g) Reconnect the ECM connector.
(h) Reconnect the A/F sensor connector.

NG

OK

(a) Replace the A/F sensor (See page 

EC-21

).

NEXT

Tester Connections

Specified Conditions

HA1A (B33-1) or HA1A (B2-2) - Body ground

10 k

Ω or higher

A1A+ (B33-3) or A1A+ (B2-22) - Body ground

A1A- (B33-4) or A1A- (B2-30) - Body ground

HA2A (B31-1) or HA2A (B2-1) - Body ground

A2A+ (B31-3) or A2A+ (B2-23) - Body ground

A2A- (B31-4) or A2A- (B2-31) - Body ground

Reference (System Diagram of Bank 1 Sensor 1):

From 
Battery

From EFI 
Relay

A/F HEATER

A/F HEATER

A/F Sensor

ECM

+B

A1A-

Sensor

Heater

A1A+

HA1A

A1A+

A1A-

HA1A

Duty 
Control

A133442E01

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

14

REPLACE AIR FUEL RATIO SENSOR