Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 93

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–327

ES

OK

Replace the air fuel ratio sensor (See page 

EC-21

).

NEXT

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

Replace the air fuel ratio sensor (See page 

EC-21

).

NEXT

NEXT

16

REPLACE AIR FUEL RATIO SENSOR

17

PERFORM CONFIRMATION DRIVING PATTERN

18

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

19

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

CHECK FOR INTERMITTENT PROBLEMS

DTC CAUSED BY RUNNING OUT OF FUEL

20

REPLACE AIR FUEL RATIO SENSOR

21

PERFORM CONFIRMATION DRIVING PATTERN

ES–328

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(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 / PENDING CODES.

(d) Read DTCs.

Result

B

A

22

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

Display (DTC Output)

Proceed To

No output

A

P2195, P2196, P2197 or P2198 (A/F sensor pending DTCs)

B

REPLACE ECM (See page 

ES-446

)

END

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–329

ES

HINT:
•

Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.

•

Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and 
located near the engine assembly.

DESCRIPTION

Refer to DTC P2195 (See page 

ES-307

).

HINT:
•

DTC P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor circuit.

DTC

P2238

Oxygen (A/F) Sensor Pumping Current Circuit 
Low (Bank 1 Sensor 1)

DTC

P2239

Oxygen (A/F) Sensor Pumping Current Circuit 
High (Bank 1 Sensor 1)

DTC

P2241

Oxygen (A/F) Sensor Pumping Current Circuit 
Low (Bank 2 Sensor 1)

DTC

P2242

Oxygen (A/F) Sensor Pumping Current Circuit 
High (Bank 2 Sensor 1)

DTC

P2252

Oxygen (A/F) Sensor Reference Ground Circuit 
Low (Bank 1 Sensor 1)

DTC

P2253

Oxygen (A/F) Sensor Reference Ground Circuit 
High (Bank 1 Sensor 1)

DTC

P2255

Oxygen (A/F) Sensor Reference Ground Circuit 
Low (Bank 2 Sensor 1)

DTC

P2256

Oxygen (A/F) Sensor Reference Ground Circuit 
High (Bank 2 Sensor 1)

DTC No.

DTC Detection Conditions

Trouble Areas

P2238
P2241

•

Case 1:
Condition (a) or (b) continues for 5.0 seconds or more (2 
trip detection logic)

(a) AF+ voltage 0.5 V or less
(b) (AF+) - (AF-) = 0.1 V or less

•

Case 2:
A/F sensor admittance: Less than 0.022 1/

Ω (2 trip 

detection logic)

•

Open or short in A/F sensor (bank 1, 2 sensor 1) circuit

•

A/F sensor (bank 1, 2 sensor 1)

•

A/F sensor heater

•

A/F sensor heater relay

•

A/F sensor heater and relay circuits

•

ECM

P2239
P2242

AF+ voltage more than 4.5 V for 5.0 seconds or more (2 trip 
detection logic)

P2252
P2255

AF- voltage 0.5 V or less for 5.0 seconds or more (2 trip 
detection logic)

P2253
P2256

AF- voltage more than 4.5 V for 5.0 seconds or more (2 trip 
detection logic)

ES–330

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

•

DTC P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 A/F sensor circuit.

•

Bank 1 refers to the bank that includes cylinder No. 1.

•

Bank 2 refers to the bank that includes cylinder No. 2.

MONITOR DESCRIPTION

The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor 
impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the 
ECM determines that there is an open or short malfunction in the A/F sensor circuit.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P2238 and P2241 (open circuit between AF+ and AF-):

Related DTCs

P2238: A/F sensor (Bank 1) open circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and GND
P2239: A/F sensor (Bank 1) short circuit between AF+ and +B
P2241: A/F sensor (Bank 2) open circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and GND
P2242: A/F sensor (Bank 2) short circuit between AF+ and +B
P2252: A/F sensor (Bank 1) short circuit between AF- and GND
P2253: A/F sensor (Bank 1) short circuit between AF- and +B
P2255: A/F sensor (Bank 2) short circuit between AF- and GND
P2256: A/F sensor (Bank 2) short circuit between AF- and +B

Required Sensors/Components (Main)

A/F sensor

Required Sensors/Components (Related)

Engine Coolant Temperature (ECT) sensor, Crankshaft position sensor

Frequency of Operation

Once per driving cycle

Duration

10 seconds: A/F sensor open circuit between AF+ and AF-
5 seconds: Others

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0455, P0456 (EVAP system)
P0500 (VSS)

AF+ terminal voltage

0.5 to 4.5 V

AF- terminal voltage

0.5 to 4.5 V

Difference between AF+ and AF- terminal voltages

0.1 to 0.8 V

ECT

5

°C (41°F) or more

Engine condition

Running

Fuel-cut

OFF

Time after fuel-cut OFF

5 seconds or more

A/F sensor heater

ON

Battery voltage

11 V or more

Ignition switch

ON

Time after ignition switch is OFF to ON

5 seconds or more