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 

DI–234

.

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 

DI–18

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 

DI–234

.

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.