Toyota 2GR-FE Manual page 517

A/F Sensor (Sensor 1)
Case
Output Voltage
Injection Volume
+25 %
-12.5 %
1
Output Voltage
More than 3.35 V
Less than 3.0 V
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 on the tester: DIAGNOSIS / ENHANCED OBD II /
ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1 S1 and O2S B 1S2 or AFS B2 S1 and O2S B2
S2 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).
• 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.
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195, P2196, 2197 OR P2198)
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
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 %
+25 %
-12.5 %
Almost
no reaction
+25 %
-12.5 %
Almost
no reaction
ES–361
Main Suspected
Trouble Areas
-
• A/F sensor
• A/F sensor heater
• A/F sensor circuit
ES
• HO2 sensor
• HO2 sensor heater
• HO2 sensor circuit
• Fuel pressure
• Gas leakage from
exhaust system
(Air-fuel ratio
extremely lean or
rich)