Toyota Tundra 2005 Service - Repair - Maintenance page 612

3 Check for open and short in harness and connector between ECM and A/F sen-
sor.
Wire Harness Side:
A/F Sensor Connector
A10
A30
HT
Sensor 1
AF+
Front View
E6 ECM Connector
HA1A
A2A+
A2A−
Reference (Bank 1 Sensor 1 System Drawing):
From
Battery
A/F Heater
Fuse
DIAGNOSTICS
+B
AF−
A23659
HA2A
A1A+
A1A−
A55007 B17415
A/F Relay
To EFI Relay
− ENGINE (1GR−FE)
PREPARATION:
(a) Disconnect the A10 or A30 A/F sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between the +B terminal of the A/F
sensor connector and body ground.
OK:
Standard:
Tester Connections
+B (2) − Body ground
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the E6 ECM connector.
CHECK:
(a) Check the resistance.
OK:
Standard (Check for open):
Tester Connections
HT (A10−1) − HA1A (E6−2)
HT (A30−1) − HA2A (E6−1)
AF+ (A10−3) − A1A+ (E6−22)
AF+ (A30−3) − A2A+ (E6−23)
AF− (A10−4) − A1A− (E6−30)
AF− (A30−4) − A2A− (E6−31)
Standard (Check for short):
Tester Connections
HT (A10−1) or HA1A (E6−2) − Body ground
HT (A30−1) or HA2A (E6−1) − Body ground
AF+ (A10−3) or A1A+ (E6−22) − Body ground
AF+ (A30−3) or A2A+ (E6−23) − Body ground
AF− (A10−4) or A1A− (E6−30) − Body ground
AF− (A30−4) or A2A− (E6−31) − Body ground
A/F Sensor
Heater
Sensor
Specified Conditions
9 V to 14 V
Specified Conditions
Below 1 Ω
Below 1 Ω
Below 1 Ω
Specified Conditions
10 kΩ or higher
10 kΩ or higher
10 kΩ or higher
ECM
HA1A
A1A+
Duty
Control
A1A−
DI−337
A23512