Toyota Sequoia (2005). Manual — part 158
–
DIAGNOSTICS
ENGINE
DI–427
621
MONITOR STRATEGY
P2444
Air pump is stuck ON
R l t d DTC
Air pump is stuck OFF
Related DTCs
P2445
Air flow volume is insufficient
P2445
Air pressure sensor is stuck
Required sensors/components
AIR pump, AIR pressure sensor
Frequency of operation
Continuous
Duration
P2444 (Air pump is stuck ON): 20 sec.
P2445 (Air pump is stuck OFF): 8 sec.
P2445 (Air flow volume is insufficient): 8 sec.
P2445 (Air pressure sensor is stuck:) 1.5 sec.
MIL operation
2 driving cycles
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
P2444: Air pump is stuck ON
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Atmospheric pressure
570 mmHg (76 kPa)
–
Battery voltage
11.5 V
–
Time after secondary air injection out of
operation
10 sec.
–
AIR pump
OFF
Air switching valve No. 2 (Bank 1)
OFF
Air switching valve No. 2 (Bank 2)
OFF
Engine RPM
–
3,750 rpm
Air injection pressure sensor fail
Not detected
P2445: Air pump is stuck OFF or air insufficient
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Atmospheric pressure
570 mmHg (76 kPa)
–
Battery voltage
11.5 V
–
Time after secondary air injection out of
operation
6 sec.
–
AIR pump
ON
Air switching valve
ON
Air switching valve No. 2 (Bank 1)
ON
Air switching valve No. 2 (Bank 2)
ON
Engine RPM
–
3,750 rpm
Delay time after engine started
6 sec.
–
Air injection pressure sensor fail
Not detected
DI–428
–
DIAGNOSTICS
ENGINE
622
P2445: Air pressure sensor is stuck
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
ECT at engine start
–
5
°
C (41
°
F)
IAT at engine start
–15
°
C (5
°
F)
–
Time that ECT is 80
°
C (176
°
F) or higher
10 to 60 min.
Cumulative intake air amount
172 g
–
One of the following conditions is met
Condition 1, 2 or 3
1. Vehicle speed
80 km/h (49.7 mile)
–
2. Engine RPM
0 rpm
–
3. Throttle position
0 deg
Air switching valve
OFF
Air switching valve No. 2 (Bank 1)
OFF
Air switching valve No. 2 (Bank 2)
OFF
Air injection pressure sensor fail
Not detected
TYPICAL MALFUNCTION THRESHOLDS
P2444: Air pump is stuck ON
Detection Criteria
Threshold
Smoothed pressure
5 kPa (113 mmHg) or more
(when AI OFF (Air pump OFF, all of air switching valves are OFF)
P2445: Air pump is stuck OFF or air insufficient
Detection Criteria
Threshold
Either of the following conditions is met
Condition 1 or 2
1. Air flow value
100 L/min. or less
2. Smoothed pressure
Less than 1 kPa (7.5 mmHg)
(when AI ON (Air pump ON, all of air switching valves are ON)
P2445: Air pressure sensor is stuck
Detection Criteria
Threshold
Detected times of identifying condition 1 is met
4 times or more
Air pressure change
5 kPa (113 mmHg) or more
–
DIAGNOSTICS
ENGINE
DI–429
623
MONITOR RESULT
Refer to page
for detailed information.
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (refer to ”Confirmation Monitor”).
MID (Monitor Identification Data) is assigned to each emissions–related component.
TID (Test Identification Data) is assigned to each test value.
Scaling is used to calculate the test value indicated on generic OBD ll scan tools.
Secondary air injection (AIR) system
MID
TID
Scaling
Description of Test Value
Minimum Test Limit
Maximum Test Limit
$71
$E1
Multiply by 0.01
(g/s)
Test value of AIR amount insufficient
Minimum test limit
Maximum test limit
$71
$E2
Multiply by 0.01
(kPa)
Test value of AIR pump stuck ON
Minimum test limit
Maximum test limit
$71
$E3
Multiply by 0.01
(kPa)
Test value of AIR pump stuck OFF
Minimum test limit
Maximum test limit
$71
$E4
Multiply by 0.01
(kPa)
Test value of AIR control valve ON
Minimum test limit
Maximum test limit
$71
$E5
Multiply by 0.01
(kPa)
Test value of AIR control valve OFF
Minimum test limit
Maximum test limit
$71
$E6
Multiply by 0.01
(kPa)
Test value of AIR pressure change for
AIR valve
Minimum test limit
Maximum test limit
$71
$E7
Multiply by 0.01
(kPa)
Test value of AIR pressure change for
AIR VSV bank 1
Minimum test limit
Maximum test limit
$71
$E8
Multiply by 0.01
(kPa)
Test value of AIR pressure change for
AIR VSV bank 2
Minimum test limit
Maximum test limit
$71
$E9
Multiply by 0.01
(kPa)
Test value of AIR pressure pulsation for
AIR VSV when AIR pressure is low
Minimum test limit
Maximum test limit
WIRING DIAGRAM
Refer to DTC P0412 on page
.
DI–430
–
DIAGNOSTICS
ENGINE
624
INSPECTION PROCEDURE
HINT:
To check the pressure condition in the secondary air passage, the hand–held tester is available.
1
Is the DTC P2444 and/or P2445 being output?
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON and push the hand–held tester main switch ON.
(c)
Select the following items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES.
CHECK:
Read the DTCs.
RESULT:
Display (DTC output)
Proceed to
P2445
A
P2444
B
P2444 and P2445
B
”P2444 and P2445” and other DTCs
C
HINT:
If any other codes besides P2444 or P2445 is output, perform troubleshooting for those DTCs first.
B
Go to step 7.
C
).
A
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