Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

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

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

DTC P2A03 A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)

DESCRIPTION

  • 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.

Refer to DTC P2195 .

DTC No.DTC Detection ConditionsTrouble Area
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 circuit
A/F sensor
ECM

WIRING DIAGRAM

Refer to DTC P2195 .


INSPECTION PROCEDURE

  • HINT:
  • Intelligent tester only:
  • Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the Air-fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the intelligent tester.


Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
On the intelligent tester, enter the following menus: Power train / Engine / Active Test / Control the Injection Volume for A/F Sensor.
Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the output voltages of the A/F and HO2 sensors (AFS B1 S1 and O2S B1 S2 or AFS B2 S1 and O2S B2 S2) displayed on the tester.
  • HINT:
The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection volume by 25 %.
Each sensor reacts in accordance with increases in the fuel injection volume.
Tester Display (Sensor)Injection VolumeStatusVoltage
AFS B1 S1 or AFS B2 S1
(A/F)		+25 %RichLess than 3.0
AFS B1 S1 or AFS B2 S1
(A/F)		-12.5 %LeanMore than 3.35
O2S B1 S2 or O2S B2 S2
(HO2)		+25 %Rich More than 0.55
O2S B1 S2 or O2S B2 S2
(HO2)		-12.5 %LeanLess than 0.4
  • NOTICE:
  • The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.
CaseA/F Sensor (Sensor 1)
Output Voltage		HO2 Sensor (Sensor 2)
Output Voltage		Main Suspected Trouble Area
1Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20-
Output Voltage
More than 3.35 V
Less than 3.0 V		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Output Voltage
More than 0.55 V
Less than 0.4 V		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
2Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
A/F sensor
A/F sensor heater
A/F sensor circuit
Output Voltage
Almost
no reaction		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Output Voltage
More than 0.55 V
Less than 0.4 V		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
3Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
HO2 sensor
HO2 sensor heater
HO2 sensor circuit
Output Voltage
More than 3.35 V
Less than 3.0 V		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Output Voltage
Almost
no reaction		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
4Injection volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Injection Volume
+25 %
-12.5 %		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
Injector
Fuel pressure
Gas leakage from exhaust system
(Air-fuel ratio extremely lean or rich)
Output Voltage
Almost
no reaction		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20Output Voltage
Almost
no reaction		Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
The following A/F Control procedure enables the technician to check and graph the voltage output of both the heated oxygen sensors. To display the graph, select the following menu items on the tester: View / Line Graph.
  • HINT:
DTC P2A00 or P2A03 may be also set, when the air-fuel ratio is stuck rich or lean.
A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would cause the engine to run rich.
A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would cause the engine to run lean.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 .
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester ON.

Enter the following menus: Power train / Engine / DTC.

Read DTCs.

  • Result:
  • Display (DTC Output)Proceed to
    P2A00 and/or P2A03A
    P2A00 and/or P2A03 and other DTCsB
  • HINT:
  • If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
A
2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E42 or E38 A/F sensor connector.

Measure the resistance of the A/F sensor connector.

  • Standard resistance (Bank 1 sensor 1):
  • Tester ConnectionConditionSpecified Condition
    HA1A (1) - +B (2)20°C (68°F) 1.8 Ω to 3.4 Ω
    HA1A (1) - A1A- (4)-10 kΩ or higher
  • Standard resistance (Bank 2 sensor 1):
  • Tester ConnectionConditionSpecified Condition
    HA2A (1) - +B (2)20°C (68°F) 1.8 Ω to 3.4 Ω
    HA2A (1) - A2A- (4)-10 kΩ or higher

Reconnect the A/F sensor connector.

NG
REPLACE AIR FUEL RATIO SENSOR
OK
3.CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)
Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E42 or E38 A/F sensor connector.

Turn the engine switch on (IG).

Measure the voltage between the +B terminal of the A/F sensor connector and body ground.

  • Standard voltage:
  • Tester ConnectionSpecified Condition
    +B (E42-2) - Body ground9 to 14 V
    +B (E38-2) - Body ground9 to 14 V

Turn the engine switch off.

Disconnect the E6 ECM connector.

Measure the resistance of the wire harness side connector.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified Condition
    HA1A (E42-1) - HA1A (E6-6)Below 1 Ω
    A1A+ (E42-3) - A1A+ (E6-18)Below 1 Ω
    A1A- (E42-4) - A1A- (E6-17)Below 1 Ω
    HA2A (E38-1) - HA2A (E6-4)Below 1 Ω
    A2A+ (E38-3) - A2A+ (E6-28)Below 1 Ω
    A2A- (E38-4) - A2A- (E6-27)Below 1 Ω
  • Standard resistance (Check for short):
  • Tester ConnectionSpecified Condition
    HA1A (E42-1) or HA1A (E6-6) - Body ground10 kΩ or higher
    A1A+ (E42-3) or A1A+ (E6-18) - Body ground10 kΩ or higher
    A1A- (E42-4) or A1A- (E6-17) - Body ground10 kΩ or higher
    HA2A (E38-1) or HA2A (E6-4) - Body ground10 kΩ or higher
    A2A+ (E38-3) or A2A+ (E6-28) - Body ground10 kΩ or higher
    A2A- (E38-4) or A2A- (E6-27) - Body ground10 kΩ or higher

Reconnect the ECM connector.

Reconnect the A/F sensor connector.

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.PERFORM CONFIRMATION DRIVING PATTERN
NEXT
5.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

Read DTCs using the intelligent tester.

Enter the following menus: Power train / Engine / DTC.

  • Result:
  • Display (DTC Output)Proceed to
    P2A00 and/or P2A03A
    No outputB
B
REPLACE ECM
A
6.REPLACE AIR FUEL RATIO SENSOR
NEXT
7.PERFORM CONFIRMATION DRIVING PATTERN
NEXT
8.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

Read DTCs using the intelligent tester.

Enter the following menus: Power train / Engine / DTC.

  • Result:
  • Display (DTC Output)Proceed to
    No outputA
    P2A00 and/or P2A03B
B
REPLACE ECM
A
END
LEXUS IS250, IS220d / GSE20 ALE20
4GR-FSE ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
SFI SYSTEM