Toyota Sequoia (2005). Manual — part 109
B17440
A46
Air Switching Valve Connector
Wire Harness Side:
–
DIAGNOSTICS
ENGINE
DI–239
433
HINT:
Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand–held tester func-
tion, conditions for air–fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.
Read freeze frame data using a hand–held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1
Check voltage between terminal 1 of air switching valve connector and body
ground.
PREPARATION:
(a)
Remove the intake manifold (see page
).
(b)
Disconnect the A46 air switching valve connector.
(c)
Connect the hand–held tester to the DLC3.
(d)
Turn the ignition switch ON and turn the tester ON.
CHECK:
(a)
When the air switching valve is operated using the hand–
held tester, measure voltage between terminal A46–1 of
the air switching valve connector and body ground.
(b)
Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 4
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 4: AP:OFF, EASV:OPEN, ASV1:CLOSE,
ASV2:CLOSE
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand–held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
Standard:
Tester operation
Tester Connection
Specified Condition
Operation 4
A46–1 – Body ground
10 V or more
Operation 1
A46–1 – Body ground
Below 1.0 V
NG
Go to step 4.
OK
A23465
Component Side:
ASV Connector
Front View
A46
B17440
A46
Air Switching Valve Connector
Wire Harness Side:
DI–240
–
DIAGNOSTICS
ENGINE
434
2
Check air switching valve.
(a)
Remove the intake manifold (see page
).
(b)
Disconnect the ASV connector.
(c)
Measure the resistance of the ASV.
Standard:
Tester Connections
Specified Conditions
A46–1 – A46–2
4.5 to 5.5
Ω
NG
Replace air switching valve.
OK
3
Check for open in harness and connector between air switching valve and body
ground.
PREPARATION:
(a)
Remove the intake manifold (see page
).
(b)
Disconnect the A46 air switching valve connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors and body ground.
OK:
Standard:
Tester Connection
Specified Condition
A46–2 – Body ground
Below 1
Ω
NG
Repair or replace harness or connector.
OK
Check for intermittent problems
(See page
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
VV
B17440
A46
Air Switching Valve Connector
Wire Harness Side:
–
DIAGNOSTICS
ENGINE
DI–241
435
4
Check for open and short in harness and connector between air injection driver
and air switching valve.
PREPARATION:
(a)
Remove the intake manifold (see page
).
(b)
Disconnect the A41 air injection driver connector.
(c)
Disconnect the A46 air switching valve connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester Connection
Specified Condition
VV (A41–6) – A46–1
Below 1
Ω
VV (A41–6) or A46–1 –
Body ground
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Replace air injection driver.
DI–242
–
DIAGNOSTICS
ENGINE
436
DTC
P0418
Air Injection System Air Pump Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page
.
DTC No.
DTC Detection Condition
Trouble Area
P0418
All of the following conditions are met, when idling just after
cold start. (1 trip detection logic):
(a) Air injection system not operate
(b) Air injection driver outputs air pump malfunction signal (20%
duty signal)
Open in air pump drive circuit
Short between air pump circuit and +B circuit
Air injection driver
ECM
P0418
All of the following conditions are met, when idling just after
cold start.
(1 trip detection logic):
(a) Air injection system operates
(b) Air injection driver outputs air pump malfunction signal (20%
duty signal)
Short between air pump circuit and body ground
Air injection driver
ECM
MONITOR DESCRIPTION
Air Injection Driver (AID) detects an open or short in the air pump and Air Switching Valve (ASV) circuit ac-
cording to the terminal voltage and sends a signal as diagnostic information to the ECM.
When the air injection system operation is required while the engine is warming up, the ECM transmits com-
mand signals to the AID to drive the air pump and ASV.
The AID inputs the command signal from ECM if: 1) VP terminal voltage is low despite the AID inputting the
command signal from the ECM to drive the ASV or 2) VP terminal voltage is high despite the AID not inputting
the command signal from the ECM.
The ECM sets the DTC based on the diagnostic information from the AID.
MONITOR STRATEGY
Related DTCs
P0418
Air pump range check
Required sensors/components
Air injection driver, Air pump
Frequency of operation
Continuous
Duration
3 sec.
MIL operation
Immediate
Sequence of operation
None
DIDMW–01
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