Toyota 2GR-FE Manual page 275

1
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
Component Side:
Air Fuel Ratio Sensor
+B
C15
Bank 1
A1A-
+B
C35
Bank 2
A2A-
OK
2
CHECK TERMINAL VOLTAGE (+B OF A/F SENSOR)
Wire Harness Side Front View:
A/F Sensor Connector
: Bank 1
C15
C35 : Bank 2
NG
3
INSPECT FUSE (A/F)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
(a) Disconnect the C15 or C35 A/F sensor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance (Bank 1 sensor 1)
Tester Connection
HA1A
HA1A (1) - +B (2)
HA1A (1) - A1A- (4)
Standard resistance (Bank 2 sensor 1)
Tester Connection
HA2A (1) - +B (2)
A1A+
HA2A (1) - A2A- (4)
(c) Reconnect the A/F sensor connector.
HA2A
NG
A2A+
A140627E01
(a) Disconnect the C15 or C35 A/F sensor Connector.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage between the terminals of the A/F
sensor connector and body ground.
Standard voltage
+B
Tester Connection
+B (C15-2) - Body ground
+B (C35-2) - Body ground
A076787E15
OK
(a) Remove the A/F sensor fuse from the No. 1 integration
relay.
(b) Measure the A/F sensor fuse resistance.
Standard resistance:
Below 1 Ω
(c) Reinstall the A/F fuse.
NG
Condition
20°C (68°F)
-
Condition
20°C (68°F)
-
REPLACE AIR FUEL RATIO SENSOR (See
page EC-19)
Go to step 7
REPLACE A/F FUSE
ES–119
Specified Condition
1.8 to 3.4 Ω
10 kΩ or higher
Specified Condition
1.8 to 3.4 Ω
ES
10 kΩ or higher
Specified Condition
9 to 14 V
9 to 14 V