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DI-656
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRL-01
DTC P0412 Secondary Air Injection System Air Switch-
ing Valve "A" Circuit
CIRCUIT DESCRIPTION
The secondary air injection system pumps air to the exhaust port to accelerate the activation of the catalyst.
The secondary air injection system consists of the ECM, air pump, Air Switching Valve (ASV) (EASV), Air
Switching Valve No.2 (ASV No.2) (ASV1, 2), pressure sensor and air injection driver (AID). The Air Switching
Valve (ASV)(EASV) is an electromagnetic type and Air Switching Valve No.2 (ASV No.2)(ASV1,2) is a vacu-
um type.
The secondary air injection system pumps pressurized air to the exhaust port by the air pump through the
ASV and ASV No.2. The ASV assists the ASV No.2. The ASV No.2 also controls air supply.
The ECM sends signals to the AID, and then the AID operates the air pump and ASV. The pressure sensor
detects pressure and exhaust pulsation in the system when the system operates and when it does not oper-
ate, and sends the data to the ECM.
To Bank1
Air Switching Valve No.2
(ASV No.2)(ASV1)
Pressure
Sensor Air Switching Valve
VSV for Air Injection
(ASV)(EASV) Engine Coolant
Air Pump Control
Air Temp. Sensor
ECM Mass Air Flow
Meter
To Bank 2
Air Switching Valve No.2
(ASV No.2)(ASV2)
Intake Air Temp.
Air Injection Sensor
Driver (AID)
B17432
DTC No. DTC Detection Condition Trouble Area
All of the following conditions are met when engine is idling just
S Open in air switching valve drive circuit
after cold start
S Short between air switching valve circuit and +B circuit
(1 trip detection logic):
P0412 S Air injection driver
(a) Air injection system does not operate (Air pump OFF and all
S Air switching valve
ASVs OFF)
S ECM
(b) Air injection driver diagnostic signal duty is 40%.
All of the following conditions are met when engine is idling just
after cold start S Short between air switching valve circuit and body ground
(1 trip detection logic): S Air injection driver
P0412
(a) Air injection system operates (Air pump ON and all ASVs S Air switching valve
ON) S ECM
(b) Air injection driver diagnostic signal duty is 40%.
DI-657
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR DESCRIPTION
The air injection driver (AID) detects an open or short in the circuit according to the voltage of the air pump
terminal (VP) and electromagnetic air switching valve terminal (VV), and sends a signal as diagnostic in-
formation to the ECM.
The AID outputs the air switching valve terminal malfunction signal to the ECM if: 1) VV terminal voltage is
low despite the AID receiving the command signal from the ECM to drive the air switching valve terminal or
2) VV terminal voltage is high despite the AID not receiving the command signal from the ECM.
The ECM stores the DTC based on the diagnostic signal from the AID and illuminates the MIL.
MONITOR STRATEGY
Air switching valve circuit malfunction (Second-
Related DTCs P0412
ary air injection system)
Required sensors/components Air injection driver, Air switching valve
Frequency of operation Continuous
Duration 3 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
Case 1:
Air pump Operating
Air switching valve Operating
Battery voltage 8V -
Ignition switch ON
Starter OFF
Case 2:
Air pump Not operating
Air switching valve Not operating
Battery voltage 8V -
Ignition switch ON
Starter OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Case 1, 2:
Diagnostic signal duty ratio from air injection driver 31 to 48 %
COMPONENT OPERATING RANGE
Parameter Standard Value
70 to 90% when secondary air injection system operating
Diagnostic signal duty ratio from air injection driver and
0% when secondary air injection system not operating
DI-658
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
Access Cab, Standard Cab:
ECM
J/C
9 26 8
GR-G GR-G
J26 J27 E3 MREL
J8 V14 VSV
J/C J/C 22 (Air Switching Valve Bank2)
7 24 27
R R R R R B-L
J26 J27 IE1 E7 AIV1
A A 1 2
2 V15 VSV
(Air Switching Valve Bank2)
26
2 Engine R G-Y
EF1 Room E7 AIV2
Air Injection 1 2
No.2 R/B Control Driver J/C
1 4 30 13 25
P P
SIP A32 J26 J27 E3 AIRP
2 3 29 12 4
G-B G-B
W-L SIV A32 J26 J27 E3 AIRV
B
5 2 GR-B 33 16 GR-B 13
J1 W-L
J/C A32 +B DI A32 J26 J27 E3 AIDI
B
B W-L 1
A33 BATT 6 4
2 2 B
Engine Room R/B
VV A32 EB2
1 3 1 2 3
R
EFI L A32 E VP A33 EB2
Relay
W-B
2 5
R B
2 2 28 J26
B-R J/C
2 2 11 J27 1
2
Engine Room R/B
A35 A31
W-B
W-B 2 2 Air Air Switching
EFI AIRP Pump Valve
1 2
No. 1 14 IE1 W W
1 1
A 2
J18 B-L (*1) W
J/C W-B
B (*2)
A
W-B
EA Battery EC EX
*1: Towing Package
*2: Except Towing Package
A23642
DI-659
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab:
ECM
11 8
B-W B-W
IA10 E3 MREL
V14 VSV
J/C (Air Switching Valve Bank2)
2 A C 22 27
R R R R R B-L
IA4 J47 J48 IE1 E7 AIV1
1 2
V15 VSV
(Air Switching Valve Bank2)
B-R 26
G-Y
E7 AIV2
1 2
6 2H 2 2A 3 2F
Air Injection
EFI Control Driver
Engine Room J/B
No. 2 5 4 10 25
P P
2 3 A32 +B SIP A32 IA10 E3 AIRP
3 9 4
EFI G-B G-B
Relay SIV A32 IA10 E3 AIRV
1 2 8 13
1 5 L GR-R GR-R E3 AIDI
EFI A33 BATT DI A32 IA10
No. 1
6 4
B EB2
VV A32
1 2F 1 2D
1 2 3
10 B 8 A32 E VP A33 R EB2
13
Air R B
FL BR
Pump
Block 1
2
W-B 6 IA10 A35 A31
12 Air Air Switching
BR Pump Valve
1 2
A B W W
J34 14 IE1
J/C
W-B W
A W-B
Battery
EA EC EZ
A23643
DI-660
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
The diagnostic information output from AID can be confirmed by connecting an oscilloscope to the diagnostic
information terminal of the AID. It narrows a trouble area search to read the waveform on the oscilloscope
when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(1) Start the engine and warm it up.
(2) Turn the ignition switch to OFF.
(3) Connect a hand-held tester to the DLC3.
(4) Connect an oscilloscope probe to the AIDI terminal
ECM Connector of the ECM.
(5) Start the engine and turn the tester ON.
E1 AIDI
B17411
(6) On the tester, select the following menu items:
AIR INJ CHECK
AIR PUMP............................ON DIAGNOSIS / ENHANCED OBD II / SYSTEM
EASV ............................OPEN CHECK / AIR INJ CHECK / MANUAL OPERATION
ASV1. .............................OPEN
ASV2...............................OPEN / OPERATION 1 and 2.
A/F BANK1.......................19.05
A/F BANK2.......................19.05 HINT:
PRESSURE....................17 kPa OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
PULSATION..............25.39 kPa
AI STATUS...........................OK ASV2:CLOSE
Remaining Time 05 sec.
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
Press [EXIT] to quit
A16555 ASV2:OPEN
Example: 80% Duty Signal 5 V/DIV. (7) Monitor the voltage output of the AID (duty ratio sig-
nal).
Oscilloscope range:
Items Contents
Terminals CH1: AIDI - E1
GND
Equipment Settings 5 V/Division, 20 to 40 ms/Division
Conditions Idling
20 ms/DIV.
NOTICE:
S This AIR INJECTION CHECK only allows technicians to operate the AI system for 5 seconds.
Furthermore, the check can be performed 4 times a trip. If the test is repeated, intervals of at
least 30 seconds are required between checks.
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.
S Performing the AIR INJ CHECK over and over again may cause the damage in the secondary
air injection system. If necessary, put an interval of several minutes between tests to prevent
overheating the system.
DI-661
DIAGNOSTICS - ENGINE (2UZ-FE)
AID Diagnostic Signal Waveforms ECM DTCs
Commands (ECM Output) Suspected Trouble Areas
100 % Duty ratio
Almost Battery Voltage Open in diagnostic signal circuit
+B Any Air Injection Air Injection Control Driver (AID)
(AI) System op- Open in AID+B circuit (AID power source)
P1613
eration Short between +B circuit and diagnostic signal circuit
GND
0 % Duty ratio Open or short in air pump or Air Switching Valve
(ASV) command signal circuit (ECM-AID)
AI System: ON Open in AID ground circuit
(Air pump ON, P1613 Short between diagnostic signal circuit and body
+B ground
ASV ON) AID
ECM
Fixed at Low Voltage AI System: OFF
GND (Air pump OFF, - Normal
ASV OFF)
20 % Duty ratio Short between air pump drive circuit and body ground
20 % Harness & connector (AID-Pump)
Air Pump: ON P0418 Air Pump
AID
+B ECM
Open in air pump drive circuit (AID-Pump) ,
or short between air pump drive circuit and +B
Air Pump: OFF P0418 Harness & connector (AID-Pump)
GND Air Pump
AID
ECM
40 % Duty ratio Short between ASV drive circuit and body ground
Harness & connector (AID-ASV)
40 % ASV: ON P0412 ASV
+B AID
ECM
Open in ASV drive circuit (AID-ASV),
or short between ASV drive circuit and +B
P0412 Harness & connector (AID-ASV)
GND ASV: OFF
AID
ASV
ECM
80 % Duty ratio
AI System: OFF
80 %
(Air pump OFF, P1613 AID
+B ECM
ASV OFF)
AI System: ON
GND (Air pump ON, Normal
ASV ON)
Excluding above P1613 AID
(excluding 0, 20, 40, 80, 100 % duty) Open in AID ground circuit
A23464
DI-662
DIAGNOSTICS - ENGINE (2UZ-FE)
HINT:
S 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.
S 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.
Wire Harness Side: PREPARATION:
(a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A31 air switching valve connector.
A31
(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 A31-1 of
Air Switching Valve Connector
B17440 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 A31-1 - Body ground 10 V or more
Operation 1 A31-1 - Body ground Below 1.0 V
NG Go to step 4.
OK
DI-663
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check air switching valve.
PREPARATION:
Component Side:
(a) Remove the intake manifold (see page EM-36).
ASV Connector
(b) Disconnect the ASV connector.
CHECK:
A31 Measure the resistance of the ASV.
OK:
Standard:
Tester Connections Specified Conditions
Front View
A23465 ASV (B13-1) - ASV (B13-2) 4.5 to 5.5
NG Replace air switching valve.
OK
3 Check for open in harness and connector between air switching valve and body
ground.
Wire Harness Side: PREPARATION:
(a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A31 air switching valve connector.
A31
CHECK:
Check the resistance between the wire harness side connec-
tors and body ground.
OK:
Standard:
Air Switching Valve Connector
B17440 Tester Connection Specified Condition
A31-2 - Body ground Below 1
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI-430).
DI-664
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check for open and short in harness and connector between air injection driver
and air switching valve.
Wire Harness Side: PREPARATION:
Air Injection Driver Connector (a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A32 air injection driver connector.
A32 (c) Disconnect the A31 air switching valve connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
VV OK:
B17444 Standard:
Tester Connection Specified Condition
Wire Harness Side: VV (A32-6) - A31-1 Below 1
VV (A32-6) or A31-1 -
10 k or higher
Body ground
A31
Air Switching Valve Connector
B17440
NG Repair or replace harness or connector.
OK
Replace air injection driver.
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