Toyota Tundra. Manual — part 1201
Fig. 135: Secondary Air Injection System Flow Diagram
DTC TROUBLE DETECTION CONDITION CHART
MONITOR DESCRIPTION
DTC
No.
DTC Detection Condition
Trouble Area
P0412
P0415
After cold engine starts, all of following conditions met (1
trip detection logic):
a. Secondary Air Injection (AIR) system not operating
(air pump OFF, Air Switching Valve [ASV] OFF)
b. Diagnostic signal from Air Injection Control Driver
(AID) 40%
c. Battery voltage 8 V or more
Open in air switching valve
(ASV) drive circuit
Air Injection Control Driver
(AID)
ASV
ECM
P0412
P0415
After cold engine starts, all of following conditions met (1
trip detection logic):
a. Secondary Air Injection (AIR) system operating (air
pump ON, Air Switching Valve [ASV] ON)
b. Diagnostic signal from Air Injection Control Driver
(AID) 40%
c. Battery voltage 8 V or more
Short between ASV drive
circuit and body ground
AID
ASV
ECM
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
The Air Injection Control Driver (AID) detects open and short circuits according to the voltages of the air pump
terminal (VP) and the Air Switching Valve (ASV) terminal (VV), and transmits diagnostic information as a
signal to the ECM.
For a short time after cold engine starts, the ECM transmits command signals to the AID to drive the air pump
and ASV.
The AID transmits an ASV malfunction signal to the ECM if either of the following conditions is met:
The voltage at the AID terminal relating to the ASV is low despite the AID receiving command signals
from the ECM to drive the ASV.
The voltage at the AID terminal relating to the ASV is high despite the AID receiving no command
signals from the ECM to drive the ASV.
The ECM sets the DTC based on diagnostic signals from the AID.
MONITOR STRATEGY
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Case 1:
TYPICAL ENABLING CONDITIONS
Related DTCs
P0412: Secondary air injection system air switching valve circuit
range check (bank 1)
P0415: Secondary air injection system air switching valve circuit
range check (bank 2)
Required Sensors/Components
(Main)
Air injection control driver
Required Sensors/Components
(Related)
Air switching valve
Frequency of Operation
Once per drive cycle
Duration
3 seconds
MIL Operation
Immediate
Sequence of Operation
None
Monitor runs whenever following DTCs not present
-
Secondary air injection pump
Operating
Secondary air injection switching valve
Operating
Battery voltage
8 V or more
Ignition switch
ON
Time after ignition switch OFF to ON
0.5 seconds or more
Starter
OFF
Time after starter turned from ON to OFF
0.5 seconds or more
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Case 2:
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE
WIRING DIAGRAM
Monitor runs whenever following DTCs not present
-
Secondary air injection pump
Not operating
Secondary air injection switching valve
Not operating
Battery voltage
8 V or more
Ignition switch
ON
Time after ignition switch OFF to ON
0.5 seconds or more
Starter
OFF
Time after starter turned from ON to OFF
0.5 seconds or more
Diagnostic signal duty ratio from air injection control driver
31% or more, and 48% or less
Diagnostic signal duty ratio from air injection
control driver
70% or more, and 90% or less when secondary air
injection system operating.
0% when secondary air injection system not operating.
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Fig. 136: Secondary Air Injection System Wiring Diagram For Bank 1
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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