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