Toyota Sequoia (2005). Manual — part 137
–
DIAGNOSTICS
ENGINE
DI–343
537
DTC
P1613
Air Injection System Air Injection Driver
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page
.
DTC No.
DTC Detection Condition
Trouble Area
P1613
Either of the following condition (a) or (b) is met:
(a) All of the following conditions are met (1 trip detection logic):
Either the air pump or air switching valve does not operate.
Air injection driver outputs a normal signal (80% duty signal)
(b) All of the following conditions are met (1 trip detection logic):
Air injection driver outputs an abnormal duty signal (duty sig-
nal excluding 0, 20, 40, 60, 80, 100%)
Air injection driver (AID)
Open in air injection driver ground circuit
P1613
All of the following conditions are met (1 trip detection logic):
(a) Air injection system operates (Air pump ON and all ASV
ON)
(b) Air injection driver outputs an air pump malfunction signal
(0% duty signal)
Short in diagnostic information signal circuit (AID – ECM)
Open or short in air pump and air switching valve command
signal circuit (AID – ECM)
Air injection driver (AID)
Open in air injection driver ground circuit
ECM
P1613
Air injection driver outputs an abnormal duty signal (100% duty
signal) (1 trip detection logic)
Open or short in AID power source circuit
Open in diagnostic information signal circuit (AID – ECM)
Air injection driver (AID)
ECM
MONITOR DESCRIPTION
When the air injection system operation is required while the engine is warming up, the ECM transmits com-
mand signals to the Air Injection Driver (AID) to drive the air pump and air switching valve.
AID detects an open or short in the air pump and air switching valve circuit according to the terminal voltage
and sends a signal as diagnostic information to the ECM.
If the air injection system drive circuit or the AID itself has a malfunction, the AID sends a malfunction signal
(duty signal) as a diagnostic information signal to the ECM (when the system is normal, a system normal
signal is sent).
The ECM sets the DTC based on the diagnostic information from the AID.
Example:
(1)
The duty ratio of the diagnostic information signal output from the AID is 0 or 100% (remains at
0 V or battery voltage).
(2)
The duty ratio output from the AID is the ratio to output the impossible (excluding 0, 20, 40, 60,
80, 100%).
(3)
The AID outputs the normal signal (normal duty signal: 80%) while the system is not operating.
DIDMX–01
DI–344
–
DIAGNOSTICS
ENGINE
538
MONITOR STRATEGY
Related DTCs
P1613
Secondary air injection system control module
range check
Required sensors/components
Air injection driver
Frequency of operation
Continuous
Duration
3 sec.
MIL operation
Immediate
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Case 1:
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
Case 2:
Either of following conditions is met
Condition 1 or 2
1. Air pump
Not operating
2. Air switching valve
Not operating
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
Case 3:
Air pump
Operating
Air switching valve
Operating
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
Case 4:
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Case 1:
One of the following conditions is met
Condition 1, 2, 3 or 4
1. Diagnostic signal duty ratio from air injection driver
1 to 10 %
2. Diagnostic signal duty ratio from air injection driver
30 %
3. Diagnostic signal duty ratio from air injection driver
49 %
4. Diagnostic signal duty ratio from air injection driver
91 to 99 %
Case 2:
Diagnostic signal duty ratio from air injection driver
70 to 90 %
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
–
DIAGNOSTICS
ENGINE
DI–345
539
Case 3:
Diagnostic signal duty ratio from air injection driver
0 %
Case 4:
Diagnostic signal duty ratio from air injection driver
100 %
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
.
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 a trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(a)
Start the engine and warm it up.
(b)
Turn the ignition switch to OFF.
(c)
Connect a hand–held tester to the DLC3.
(d)
Connect an oscilloscope probe to the AIDI terminal of the
ECM.
(e)
Start the engine and turn the tester ON.
(f)
On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ SYSTEM.
(g)
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:OFF
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
Example: 80% Duty Signal
5 V/DIV.
GND
20 ms/DIV.
DI–346
–
DIAGNOSTICS
ENGINE
540
(1)
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 (WAIT or ERROR). If the ERROR (AI STATUS NG) is displayed on the tester, 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.
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