Toyota Sequoia (2005). Manual — part 110
–
DIAGNOSTICS
ENGINE
DI–243
437
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Case 1:
Air pump
Operating
Air switching valve
Operating
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
Case 2:
Air pump
Not operating
Air switching valve
Not operating
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Case 1, 2:
Diagnostic signal duty ratio from air injection driver
11 to 29 %
COMPONENT OPERATING RANGE
Parameter
Standard Value
Diagnostic signal duty ratio from air injection driver
70 to 90% when secondary air injection system operating
and
0% when secondary air injection system not operating
WIRING DIAGRAM
Refer to DTC P0412 on page
.
B17411
ECM Connector
E1
AIDI
A16555
AIR INJ CHECK
AIR PUMP. . . . . . . ON
EASV . . . . . . . OPEN
ASV1. . . . . . . . .OPEN
ASV2. . . . . . . ...OPEN
A/F BANK1. . . . . ...19.05
A/F BANK2. . . . . ...19.05
PRESSURE. . . . . 17 kPa
PULSATION. . . ..25.39 kPa
AI STATUS. . . . . . ...OK
Remaining Time 05 sec.
Press [EXIT] to quit
Example: 80% Duty Signal
5 V/DIV.
GND
20 ms/DIV.
DI–244
–
DIAGNOSTICS
ENGINE
438
INSPECTION PROCEDURE
HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows the trouble area search to read the waveform on the oscillo-
scope 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
of the ECM.
(5)
Start the engine and turn the tester ON.
(6)
On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM
CHECK / AIR INJ SYSTEM.
(7)
On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM
CHECK / AIR INJ CHECK / MANUAL OPERATION
/ OPERATION 1 and 2.
HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
(8)
Monitor the voltage output of the AID (duty ratio sig-
nal).
Oscilloscope range:
Items
Contents
Terminals
CH1: AIDI – E1
Equipment Settings
5 V/Division, 20 to 40 ms/Division
Conditions
Idling
NOTICE:
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 (AI STATUS NG) or ERROR. At this time stop the engine for 10 minutes and then try
again.
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.
A23464
AID Diagnostic Signal Waveforms
ECM
Commands
DTCs
Suspected Trouble Areas
(ECM Output)
100 % Duty ratio
+B
Almost Battery Voltage
GND
0 % Duty ratio
+B
Fixed at Low Voltage
GND
20 % Duty ratio
20 %
+B
GND
40 % Duty ratio
40 %
+B
GND
80 % Duty ratio
80 %
+B
GND
Excluding above
(excluding 0, 20, 40, 80, 100 % duty)
Air Pump: ON
Air Pump: OFF
ASV: ON
ASV: OFF
AI System: OFF
(Air pump OFF,
ASV OFF)
AI System: ON
(Air pump ON,
ASV ON)
P1613
P0418
P0418
P0412
P0412
P1613
P1613
Air Injection Control Driver (AID)
Open in AID+B circuit (AID power source)
Open or short in air pump or Air Switching Valve
AID
ECM
Open in air pump drive circuit (AID–Pump) ,
Harness & connector (AID–Pump)
Air Pump
AID
ECM
Short between air pump drive circuit and body ground
AID
ECM
Harness & connector (AID–Pump)
Air Pump
Open in ASV drive circuit (AID–ASV),
Harness & connector (AID–ASV)
ASV
AID
ECM
Short between ASV drive circuit and body ground
Harness & connector (AID–ASV)
AID
ECM
ECM
Normal
AID
AID
or short between air pump drive circuit and +B
or short between ASV drive circuit and +B
ASV
–
AI System: OFF
(Air pump OFF,
ASV OFF)
AI System: ON
(Air pump ON,
ASV ON)
Normal
Any Air Injection
(AI) System op-
eration
P1613
Open in AID ground circuit
Short between +B circuit and diagnostic signal circuit
Short between diagnostic signal circuit and body
(ASV) command signal circuit (ECM–AID)
ground
Open in AID ground circuit
Open in diagnostic signal circuit
–
DIAGNOSTICS
ENGINE
DI–245
439
B17438
Wire Harness Side:
Air Pump Connector
A43
DI–246
–
DIAGNOSTICS
ENGINE
440
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 2 of air pump and body ground.
PREPARATION:
(a)
Remove the intake manifold (see page
).
(b)
Disconnect the A43 air pump 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 pump is operated using the hand–held tes-
ter, measure the voltage between terminal A43–2 of the
air injection driver 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 3
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 3: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
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 3
A43–2 – Body ground
10 V or more
Operation 1
A43–2 – Body ground
Below 1.0 V
NG
Go to step 4.
OK
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