Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 98

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–347

ES

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:
•

DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. 
ECM replacement is necessary.

•

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when 
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle 
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and 
other data, from the time the malfunction occurred.

(a) Replace the ECM (See page 

ES-446

).

NEXT

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs (See page 

ES-38

).

(e) Start the engine and wait for 10 minutes or more.
(f)

Select the following menu items: DIAGNOSIS / 
ENHANCED OBD II / DTC / INFO / PENDING CODES.

(g) If no pending DTC is displayed, the repair has been 

successfully completed.

NEXT

Duration

10 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTC not present

None

Ignition switch

ON

Engine

Running

Battery voltage

8 V or more

Starter

OFF

Soak timer measurement when ECM CPU clock counts 10 minutes

Less than 7 minutes, or more than 13 minutes

1

REPLACE ECM

2

CHECK WHETHER DTC OUTPUT RECURS (DTC P2610)

END

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

HINT:
•

DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor.

•

DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor.

•

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

•

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

•

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

).

MONITOR DESCRIPTION

After engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel ratio 
at the stoichiometric level. In addition, active A/F control is performed for approximately 10 seconds after 
preconditions are met in order to measure the A/F sensor response rate. During active A/F control, the 
ECM forcibly increases and decreases the injection volume a certain amount, based on the stoichiometric 
air-fuel ratio learned during normal air-fuel ratio control, and measures the A/F sensor response rate. The 
ECM receives a signal from the A/F sensor while performing active A/F control and uses it to calculate the 
A/F sensor response rate deterioration level.
If the value for A/F sensor response rate deterioration level is less than the threshold, the ECM interprets 
this as a malfunction and sets the DTC.

DTC

P2A00

A/F Sensor Circuit Slow Response (Bank 1 
Sensor 1)

DTC

P2A03

A/F Sensor Circuit Slow Response (Bank 2 
Sensor 1)

DTC No.

DTC Detection Conditions

Trouble Areas

P2A00
P2A03

Calculated value for air-fuel ratio (A/F) sensor response rate 
deterioration level is less than threshold

•

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

•

A/F sensor

•

A/F sensor heater

•

ECM

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–349

ES

CONFIRMATION DRIVING PATTERN

HINT:
Performing this confirmation pattern will activate the A/F sensor response monitor.

Air-Fuel Ratio Sensor Output

Active A/F Control

A/F Sensor Output

Normal

Malfunction

10 Seconds

Fuel Injection Volume

Increase

Decrease

ON

OFF

A115363E04

Ignition Switch OFF

Idling

Between

25 and 75 mph 
(40 and 120 km/h)

Vehicle Speed

(g)

(h)

Warming up

3 minutes

Time

A115372E45

ES–350

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs (See page 

ES-38

).

(e) Select the following menu items: DIAGNOSIS /ENHANCED OBD II / MONITOR INFO / MONITOR 
RESULT.
(f) Check that RES RATE B1S1 and RES RATE B2S1 are INCOMPL.
(g) Start the engine and warm it up.
(h) Drive the vehicle at between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes. However, the 
vehicle should be driven at a constant speed.
(i) Check the monitor result values on an intelligent tester by selecting the following menu items: 
DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT / RES RATE B1S1 and RES 
RATE B2S1.
(j) If the values indicated on the tester do not change, perform READINESS MONITOR DRIVE PATTERN 
for the A/F sensor and the heated oxygen sensor (See page 

ES-23

).

HINT:
Completion of all A/F sensor monitors is required to change the value in RES RATE B1S1 and RES RATE 
B2S1.
(k) Note the value of the RES RATE B1S1 and RES RATE B2S1.
(l) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
(m) Check if any DTCs (any pending DTCs) are set.

MONITOR STRATEGY

Related DTCs

P2A00: A/F sensor (Bank 1) slow response
P2A03: A/F sensor (Bank 2) slow response

Required Sensors/Components (Main)

A/F sensor

Required Sensors/Components (Related)

Vehicle speed sensor, Crankshaft position sensor

Frequency of Operation

Once per driving cycle

Duration

10 to 15 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

Tester 
Display

G034992E02