Toyota 2GR-FE Manual page 345

A/F Sensor (Sensor 1)
Case
Output Voltage
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 B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2, and press the
YES button and then the ENTER button followed by the F4 button.
HINT:
• 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).
• If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set.
• If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be set.
1
READ DTC OUTPUT
Result
Display (DTC Output)
P0138 or P0158
P0137 or P0157
P0136 or P0156
A
2
READ VALUE OF OXYGEN SENSOR (OUTPUT VOLTAGE)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Injection Volume
Output Voltage
Injection Volume
Output Voltage
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch on (IG) and turn the tester on.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs.
B
C
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch on (IG) and turn the tester on.
HO2 Sensor (Sensor 2)
Output Voltage
+25 %
-12.5 %
Almost
no reaction
+25 %
-12.5 %
Almost
no reaction
Proceed to
Go to step 14
Go to step 7
ES–189
Main Suspected
Trouble Area
• HO2 sensor
• HO2 sensor heater
• HO2 sensor circuit
• Fuel pressure
• Gas leakage from
exhaust system
(Air-fuel ratio
extremely lean or
rich)
A
B
C
ES