Toyota 2GR-FE Manual page 549

A/F Sensor (Sensor 1)
Case
Output Voltage
Injection Volume
+25 %
-12.5 %
2
Output Voltage
Almost
no reaction
Injection Volume
+25 %
-12.5 %
3
Output Voltage
More than 3.35 V
Less than 3.0 V
Injection volume
+25 %
-12.5 %
4
Output Voltage
Almost
no reaction
• Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
both the A/F and HO2 sensors.
• To display the graph, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST /
A/F CONTROL / USER DATA / AFS B1 S1 and O2S B1 S2 or AFS B2 S1 and O2S B2 S2, and press
the YES button and then the ENTER button followed by the F4 button.
HINT:
• DTC P2A00 or P2A03 may also be 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. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame
data can be helpful in determining whether the vehicle was running or stopped, whether the engine
was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the
time of a malfunction (See page ES-45).
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)
Result
Display (DTC Output)
P2A00 and/or P2A03
P2A00 and/or P2A03 and other DTCs
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Injection Volume
Output Voltage
More than 0.55 V
Less than 0.4 V
Injection Volume
Output Voltage
Injection Volume
Output Voltage
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch on (IG).
(c) Turn the tester on.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
HO2 Sensor (Sensor 2)
Output Voltage
+25 %
-12.5 %
+25 %
-12.5 %
Almost
no reaction
+25 %
-12.5 %
Almost
no reaction
Proceed to
ES–393
Main Suspected
Trouble Area
• A/F sensor
• A/F sensor heater
A/F sensor circuit
• HO2 sensor
• HO2 sensor heater
• HO2 sensor circuit
• Fuel pressure
• Gas leakage from
exhaust system
(Air-fuel ratio
extremely lean or
rich)
A
B
ES