Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 92

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–323

ES

•

The ECM stops fuel injection (fuel cut) during engine 
deceleration. This causes a lean condition and results in a 
momentary increase in the A/F sensor output voltage.

•

The ECM must establish a closed throttle valve position 
learning value to perform fuel cut. If the battery terminal 
has been reconnected, the vehicle must be driven over 10 
mph (16 km/h) to allow the ECM to learn the closed throttle 
valve position.

•

When the vehicle is driven:
The output voltage of the A/F sensor may be below 2.8 V 
during fuel enrichment. For the vehicle, this translates to a 
sudden increase in speed with the accelerator pedal fully 
depressed when trying to overtake another vehicle. The A/
F sensor is functioning normally.

•

The A/F sensor is a current output element; therefore, the 
current is converted into a voltage inside the ECM. 
Measuring the voltage at the connectors of the A/F sensor 
or ECM will show a constant voltage result.

NG

OK

NEXT

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and the tester ON.
(c) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / DTC INFO / PENDING CODES.

(d) Read DTCs.

Result

B

A

Replace the air fuel ratio sensor (See page 

EC-21

).

NEXT

              Go to step 10

4

PERFORM CONFIRMATION DRIVING PATTERN

5

CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

Display (DTC Output)

Proceed To

P2195, P2196, P2197 or P2198

A

No output

B

              Go to step 9

6

REPLACE AIR FUEL RATIO SENSOR

ES–324

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

NEXT

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and the tester ON.
(c) Select the following menu items: DIAGNOSIS / 

ENHANCED OBD II / DTC INFO / PENDING CODES.

(d) Read DTCs.

Result

B

A

NO

YES

NG

OK

NG

OK

7

PERFORM CONFIRMATION DRIVING PATTERN

8

CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

Display (DTC Output)

Proceed To

No output

A

P2195, P2196, P2197 or P2198

B

REPLACE ECM AND PERFORM 
CONFIRMATION DRIVING PATTERN

9

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

CHECK FOR INTERMITTENT PROBLEMS

DTC CAUSED BY RUNNING OUT OF FUEL

10 

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

ES-85

)

REPLACE AIR FUEL RATIO SENSOR (See 
page 

EC-21

)

11 

INSPECT AIR FUEL RATIO SENSOR HEATER RELAY (See page 

ES-86

)

REPLACE AIR FUEL RATIO SENSOR 
HEATER RELAY

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–325

ES

(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)

Standard Resistance (Check for short)

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

12

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

HA1A

A1A+ or A2A+

A2A+

A2A-

A1A-

A1A+

HA2A

A1A- or A2A-

A116153E10

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)

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

ES–326

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

NG

OK

(a) Check the air induction system for vacuum leakage.

OK:

No leakage from air induction system.

NG

OK

(a) Check the fuel pressure (See page 

FU-6

).

NG

OK

(a) Check the injector injection (whether fuel volume is high 

or low, and whether injection pattern is poor).

NG

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

13

CHECK AIR INDUCTION SYSTEM

REPAIR OR REPLACE AIR INDUCTION 
SYSTEM

14

CHECK FUEL PRESSURE

REPAIR OR REPLACE FUEL SYSTEM

15

INSPECT FUEL INJECTOR ASSEMBLY

REPLACE FUEL INJECTOR ASSEMBLY (See 
page 

FU-11

)