Toyota Tundra 2005 Service - Repair - Maintenance page 1057

2 Check voltage between AIDI terminal of ECM and body ground.
Results
Fixed at Low (1.6 V or less)
even when AI system ON
(Air pump ON, ASV ON)
Fixed at High (12 V or more)
even when AI system OFF
(Air pump OFF, ASV OFF)
Other than above:
S Fluctuating (duty signal excluding 20, 40,
80%)
A
DIAGNOSTICS
PREPARATION:
(a)
(b)
E3
(c)
(d)
(e)
(f)
AIDI
B17411
CHECK:
Measure voltage between terminal E3−13 (AIDI) of the ECM
connector and body ground when the air injection system is ON
and OFF.
RESULT:
Suspected Trouble Areas
S Short between air pump or air switching valve
command signal circuit and body ground
S Open in air pump command signal circuit (be-
tween ECM and AID)
S Open in ASV command signal circuit (between
ECM and AID)
S Open in AID ground circuit (between AID and
body ground)
S Diagnostic signal circuit ground short
S AID
S ECM
S Open in diagnostic signal circuit (ECM − AID)
S Short between +B circuit and diagnostic signal
circuit (ECM − AID)
S Open in AID power source circuit
S AID
S ECM
S AID
S Open in AID ground circuit (between AID and
body ground)
B
C
− ENGINE (2UZ−FE)
Start the engine and warm it up.
Turn the ignition switch to OFF.
Connect a hand−held tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Start the engine.
Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AU-
TOMATIC OPERATION
Go to step 5.
Go to step 8.
DI−773
Proceed To
A
B
C