Toyota Sequoia (2005). Manual — part 130
B17424
Monitor Operation Outline
Running
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Engine
Air pump
ASV
(Electromagnetic Type)
ASV No.2 (Bank 1)
(Vacuum Type)*
System Air Pressure
ASV No.2 (Bank 2)
(Vacuum Type)*
A B
C
D
E
F
*: ASV No.2 opens alternately per a trip.
–
DIAGNOSTICS
ENGINE
DI–315
509
MONITOR DESCRIPTION
The ECM detects pressure change with the pressure sensor to determine malfunctioning parts in the system,
and stores the DTCs. The ECM measures pressure and/or exhaust pulsation of the system at 6 points, A
to F, when the air injection system is in operation or when not in operation. When the pressure is high, the
ECM determines the that pump operates. When exhaust pulsation is detected, the ECM determines that the
ASV is open. The ECM determines malfunction parts based on the measured value, and stores the DTCs.
Points A and B:
ECM detects pressure changes (decrease), and determines that the ASV No.2 is open.
Points C and F:
ECM detects pressure and exhaust pulsation, and determines the pressure pattern of the system.
Point D:
ECM operates the system, as indicated by the dashed lines, to determine which of the ASV No.2 is malfunc-
tioning only when pressure changes cannot be detected at point A or B.
Point E:
ECM detects exhaust pulsation to determine the condition of the system.
Pressure condition in Secondary Air Injection System (Point C and F)
Pattern 1:
Air Pump
ON
Air Switching Valve and Air Switching Valve No.2
Open
Pressure
1 kPa or more
Pulsation detection
Exhaust gas pulsation detected
Monitor
Judgement
C
DTCs where set
F
A
B
D
E
Pattern 1 Pattern 1
No pressure changed
Pressure changed
No pressure changed
P2444, P1441 and P1444
Pressure changed
No pulsation detected
No pressure changed
Pressure changed
Pattern 1 Pattern 1
No pulsation detected
P2444 and ”P1441 or P1444”
Pattern 1 Pattern 1
Pressure changed
No pressure changed
Pulsation detected
No pulsation detected
P2444, P1441 and P1444
Pattern 1 Pattern 1
No pressure changed
No pressure changed
Pulsation detected
No pulsation detected
P2444, P1441 and P1444
Pattern 1 Pattern 2
Pressure changed
Pressure changed
No pulsation detected
P1441 and P1444
Pattern 1 Pattern 2
Pressure changed
No pulsation detected
Pattern 1 Pattern 2
No pressure changed
Pressure changed
Pulsation detected
No pulsation detected
Pattern 1 Pattern 2
No pressure changed
Pulsation detected
No pulsation detected
Pattern 1 Pattern 3
Pressure changed
Pressure changed
No pulsation detected
P2444
Pattern 1 Pattern 3 No pressure changed
Pressure changed
No pulsation detected
P2444 and ”P1442 or P1445”
Pattern 1 Pattern 3
No pressure changed
Pressure changed
No pulsation detected
No pulsation detected
Pattern 1 Pattern 3 No pressure changed No pressure changed No pulsation detected No pulsation detected
P2444, P1442 and P1444
Pattern 1 Pattern 4
Pressure changed
Pressure changed
No pulsation detected
Normal
Pattern 1 Pattern 4
Pressure changed
No pressure changed
Pulsation detected
No pulsation detected
Normal
Pattern 1 Pattern 4
Pressure changed
No pressure changed No pulsation detected No pulsation detected
Pattern 1 Pattern 4
Pressure changed
No pressure changed
No pulsation detected
Pattern 1 Pattern 4 No pressure changed No pressure changed
Pulsation detected
No pulsation detected
Pattern 1 Pattern 4 No pressure changed No pressure changed No pulsation detected No pulsation detected
P1442 and P1445
Pattern 2
No pressure changed No pressure changed
P2445
Pattern 3 Pattern 3
No pressure changed No pressure changed No pulsation detected No pulsation detected
P2441, P2444, P1442 and
P1445
Pattern 3 Pattern 4
No pressure changed No pressure changed No pulsation detected No pulsation detected
P2441, P1442 and P1445
Pattern 4
No pressure changed No pressure changed
P2445
Pulsation detected
P2440 and ”P1441 or P1444”
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
P1441 or P1444
–
P1441 and P1444
P1441 and P1444
P2444 and ”P1442 or P1445”
P1442 or P1445
P1442 or P1445
P1442 or P1445
DI–316
–
DIAGNOSTICS
ENGINE
510
Pattern 2:
Air Pump
OFF
Air Switching Valve and Air Switching Valve No.2
Open
Pressure
Less than 5 kPa
Pulsation detection
Exhaust gas pulsation detected
Pattern 3:
Air Pump
ON
Air Switching Valve and Air Switching Valve No.2
Close
Pressure
1 kPa or more
Pulsation detection
Slight pulsation detected
Pattern 4:
Air Pump
OFF
Air Switching Valve and Air Switching Valve No.2
Close
Pressure
Less than 5 kPa
Pulsation detection
Not detected
Judgement and decision of failure mode:
–
DIAGNOSTICS
ENGINE
DI–317
511
MONITOR STRATEGY
P1441
Air switching valve No. 2 (Bank 1) is stuck open
Related DTCs
P1444
Air switching valve No. 2 (Bank 2) is stuck open
Related DTCs
P2440
Air switching valve and air switching valve No. 2
are stuck open
Required sensors/components
Pressure sensor, Air switching valve No. 2 (Bank 1, 2), Electromagnetic air switching valve
Frequency of operation
Continuous
Duration
P1441 (Air switching valve No. 2 (Bank 1) is stuck open): 20 sec.
P1444 (Air switching valve No. 2 (Bank 2) is stuck open): 20 sec.
P2440 (Air switching valve and air switching valve No. 2 are stuck open): 18 sec.
MIL operation
P1441 (Air switching valve No. 2 (Bank 1) is stuck open): 2 driving cycles
P1444 (Air switching valve No. 2 (Bank 2) is stuck open): 2 driving cycles
P2440 (Air switching valve and air switching valve No. 2 are stuck open):
1 driving cycle
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
P1441, P1444: Air switching valve No. 2 bank 1 and/or bank 2 are stuck open
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
CASE 1
Atmospheric pressure
76 kPa (570 mmHg)
–
Battery voltage
11.5 V
–
Time after secondary air injection out of
operation
10 sec.
–
AIR pump
OFF
Time after engine start
10 sec.
–
Air switching valve No. 2 (Bank 1)
OFF
Air switching valve No. 2 (Bank 2)
OFF
Air injection pressure sensor fail
Not detected
Air switching valve
ON
Engine RPM
–
3,750 rpm
CASE 2
Atmospheric pressure
76 kPa (570 mmHg)
–
Battery voltage
11.5 V
–
AIR pump
OFF
Time after engine start
10 sec.
–
Air switching valve No. 2 (Bank 1)
OFF
Air switching valve No. 2 (Bank 2)
OFF
Air injection pressure sensor fail
Not detected
Engine load
0%
–
Intake air amount
40 g/sec
–
IAT at engine start
–15
°
C (5
°
F)
–
ECT at engine start
–
5
°
C (41
°
F)
DI–318
–
DIAGNOSTICS
ENGINE
512
Air switching valve
ON
Engine RPM
–
3,750 rpm
P2440: Electromagnetic air switching valve and air switching valve No. 2 are stuck open
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Atmospheric pressure
76 kPa (570 mmHg)
–
Battery voltage
11.5 V
–
Time after secondary air injection out of
operation
10 sec.
–
Cumulative intake air amount
172 g
–
AIR pump
OFF
Air switching valve
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
TYPICAL MALFUNCTION THRESHOLDS
P1441, P1444: Air switching valve No. 2 bank 1 and/or bank 2 are stuck open
Detection Criteria
Threshold
CASE 1:
Both of the following conditions are met
Condition (a) and (b)
(a) Cumulative pressure pulsation (When AI OFF)
20 kPa (150 mmHg) or more
(b) Air pressure change (When ASV No.2 open)
(P1441 (Bank 1), P1444 (Bank 2))
Less than 1 kPa (7.5 mmHg) or more
CASE 2:
Detected times of identifying condition 1 is met
4 times or more
1. Cumulative pressure pulsation
100 kPa (750 mmHg) or more
P2440: Electromagnetic air switching valve and air switching valve No. 2 are stuck open
Detection Criteria
Threshold
Detected times of identifying condition 1 is met
4 times or more
1. Cumulative pressure pulsation
100 kPa (750 mmHg) or more
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст