Toyota Tundra 2005 Service - Repair - Maintenance page 499

DI−232
Standard:
Tester Display
(Sensor)
AFS B1S1
(A/F)
AFS B1S1
(A/F)
O2S B1S2
(HO2)
O2S B1S2
(HO2)
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.
A/F Sensor (Sensor 1)
Case
Output Voltage
Injection volume
+25 %
−12.5 %
Output voltage
1
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 %
Output voltage
3
More than 3.35 V
Less than 3.0V
Injection volume
+25 %
−12.5 %
Output voltage
4
Almost
no reaction
S
Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs
of both the A/F and HO2 sensors.
S
To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD
II / ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2, and press the YES but-
ton and then the ENTER button followed by the F4 button.
DIAGNOSTICS −
Injection Volumes
+25 %
−12.5 %
+25 %
−12.5 %
HO2 Sensor (Sensor 2)
Output Voltage
Injection volume
+25 %
−12.5 %
Output voltage
More than 0.55 V
OK
Less than 0.4V
Injection volume
+25 %
−12.5 %
Output voltage
More than 0.55 V
NG
Less than 0.4V
Injection volume
+25 %
−12.5 %
Output voltage
Almost
OK
no reaction
Injection volume
+25 %
−12.5 %
Output voltage
Almost
NG
no reaction
ENGINE (1GR−FE)
Status
Rich
Lean
Rich
Lean
OK
OK
NG
NG
Voltages
Less than 3.0
More than 3.35
More than 0.55
Less than 0.4
Main Suspected
Trouble Areas
A/F sensor
A/F sensor heater
A/F sensor circuit
HO2 sensor
HO2 sensor heater
HO2 sensor circuit
Injector
Fuel pressure
Gas leakage from
exhaust system
(Air−fuel ratio extremely
lean or rich)