2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1613; Secondary Air Injection Driver Malfunction; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM0000013TL00EX
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1613; Secondary Air Injection Driver Malfunction; 2007 MY LX470 [08/2006 - ]

DTC

P1613

Secondary Air Injection Driver Malfunction

DESCRIPTION

Refer to DTC P0412 .

DTC No.	DTC Detection Condition	Trouble Area
P1613	Either of following condition (a) or (b) is met: (a) Both of following conditions are met (1 trip detection logic): While either of air pump or air switching valve does not operate Air injection control driver outputs normal signal (80% duty signal) (b) Following condition is met (1 trip detection logic): Air injection control driver outputs abnormal duty signal (duty signal excluding 0, 20, 40, 60, 80, 100%)	Air injection control driver (AID) Open in air injection control driver ground circuit
P1613	Both of following conditions are met (1 trip detection logic): (a) While air injection system operating (Air pump ON and all ASV ON) (b) Air injection control driver outputs 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 control driver (AID) Open in air injection control driver ground circuit ECM
P1613	Air injection control driver outputs 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 control driver (AID) ECM

MONITOR DESCRIPTION

When the air injection system operation is required while the engine is warming up, the ECM transmits command signals to the Air Injection Control Driver (AID) to drive the air pump and Air Switching Valve (ASV).

AID detects an open and short in the air pump and air switching valve circuit according to the terminal voltage and sends a signal as the 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:

The duty ratio of the diagnostic information signal output from AID is 0 or 100% (remains at 0 V or battery voltage).
The duty ratio of the diagnostic signal from the AID shows an impossible ratio (other than 0, 20, 40, 60, 80, 100%).
The AID outputs the normal signal (normal duty signal: 80%) while the system is not operating.

MONITOR STRATEGY

Related DTCs	P1613: Secondary air injection system control module range check
Required sensors/components	Air injection control driver
Frequency of operation	Continuous
Duration	3 seconds
MIL operation	Immediate
Sequence operation	None

TYPICAL ENABLING CONDITIONS

All:

The monitor will run whenever these DTCs are not present

Case 1:

Battery voltage	8 V or more
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 or more
Ignition switch	ON
Starter	OFF

Case 3:

Air pump	Operating
Air switching valve	Operating
Battery voltage	8 V or more
Ignition switch	ON
Starter	OFF

Case 4:

Battery voltage	8 V or more
Ignition switch	ON
Starter	OFF

TYPICAL MALFUNCTION THRESHOLDS

Case 1:

One of the following conditions is met	Condition 1, 2, 3 or 4
1. Diagnostic signal duty ratio from air injection control driver	1 to 10%
2. Diagnostic signal duty ratio from air injection control driver	30%
3. Diagnostic signal duty ratio from air injection control driver	49%
4. Diagnostic signal duty ratio from air injection control driver	91 to 99%

Case 2:

Diagnostic signal duty ratio from air injection control driver

70 to 90%

Case 3:

Diagnostic signal duty ratio from air injection control driver

Case 4:

Diagnostic signal duty ratio from air injection control driver

100%

COMPONENT OPERATING RANGE

Diagnostic signal duty ratio from air injection control driver

70 to 90% when secondary air injection system is operating

and

0% when secondary air injection system is not operating

WIRING DIAGRAM

Refer to DTC P0412 .

INSPECTION PROCEDURE

HINT:

The diagnostic information output from the Air Injection Control Driver (AID) can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the AID. A trouble area search can be narrowed by reading the waveform on the oscilloscope 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 OFF.
(c) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM 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, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ SYSTEM.
(g) On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / 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

(h) Monitor the voltage output of the AID (duty ratio signal).

Oscilloscope range:

Item	Content
Terminal	CH1: AIDI - E1
Equipment Setting	5 V/DIV., 20 to 40 msec./DIV.
Condition	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 intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If 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 damage in the secondary air injection system. If necessary, wait several minutes between tests to prevent overheating the system.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

AID Diagnostic Signal Waveform	ECM Command	DTC (ECM Output)	Suspected Trouble Area
100% Duty Ratio See waveform 1	Any Air Injection (AI) System operation	P1613	Open in diagnostic signal circuit Air Injection Control Driver (AID) Open in AID +B circuit (AID power source) Short between +B circuit and diagnostic signal circuit
0% Duty Ratio See waveform 2	AI System: ON (Air pump ON, ASV ON)	P1613	Open or short in air pump or Air Switching Valve (ASV) command signal circuit (ECM - AID) Open in AID ground circuit Short between diagnostic signal circuit and body ground AID ECM
0% Duty Ratio See waveform 2	AI System: OFF (Air pump OFF, ASV OFF)	-	Normal
20% Duty Ratio See waveform 3	Air Pump: ON	P0418	Short between air pump drive circuit and body ground Harness & connector (AID - Pump) Air Pump AID ECM
20% Duty Ratio See waveform 3	Air Pump: OFF	P0418	Open in air pump drive circuit (AID - Pump), or short between air pump drive circuit and +B Harness & connector (AID - Pump) Air Pump AID ECM
40% Duty Ratio See waveform 4	ASV: ON	P0412	Short between ASV drive circuit and body ground Harness & connector (AID - ASV) ASV AID ECM
40% Duty Ratio See waveform 4	ASV: OFF	P0412	Open in ASV drive circuit (AID - ASV), or short between ASV drive circuit and +B Harness & connector (AID - ASV) AID ASV ECM
80% Duty Ratio See waveform 5	AI System: OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
80% Duty Ratio See waveform 5	AI System: ON (Air pump ON, ASV ON)	-	Normal
Excluding Above (excluding 0, 20, 40, 80, 100% duty)	-	P1613	AID Open in AID ground circuit

1. Waveform 1

100% Duty Ratio

2. Waveform 2

0% Duty Ratio

3. Waveform 3

20% Duty Ratio

4. Waveform 4

40% Duty Ratio

5. Waveform 5

80% Duty Ratio

HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the intelligent tester function, conditions for air fuel ratio and pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. It helps technicians to troubleshoot the system when it is malfunctioning.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1613)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the tester ON.

(d) Read DTCs.

Display (DTC Output)	Proceed to
P1613	A
P1613 and other DTCs	B

HINT:

If any DTCs other than P1613 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AIDI VOLTAGE)

(a) Start the engine and warm it up.

(b) Turn the ignition switch OFF.

(d) Turn the ignition switch ON and turn the tester ON.

(e) Start the engine.

(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC.

NOTICE:

When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

(g) Measure voltage between terminal E10-13 (AIDI) of the ECM connector and body ground when the air injection system is ON and OFF.

Results

Suspected Trouble Areas

Proceed to

Fixed at Low (1.6 V or less)

even when AI system ON

(Air pump ON, ASV ON)

Short between air pump or air switching valve command signal circuit and body ground
Open in air pump command signal circuit (between ECM and AID)
Open in ASV command signal circuit (between ECM and AID)
Open in AID ground circuit (between AID and body ground)
Diagnostic signal circuit ground short
AID
ECM

Fixed at High (12 V or more)

even when AI system OFF

(Air pump OFF, ASV OFF)

Open in diagnostic signal circuit (ECM - AID)
Short between +B circuit and diagnostic signal circuit (ECM - AID)
Open in AID power source circuit
AID
ECM

Other than above:

Fluctuating (duty signal excluding 20, 40, 80%)

AID
Open in AID ground circuit (between AID and body ground)

GO TO STEP 5

GO TO STEP 8

3.	INSPECT ECM (AIRP AND AIRV VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure voltage between terminal E10-25 (AIRP), E10-4 (AIRV) of the ECM connector and body ground.

Standard voltage:

Tester Connection	Specified Condition
E10-25 (AIRP) - Body ground	10 V or more
E10-4 (AIRV) - Body ground	10 V or more

REPLACE ECM

4.	CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER, AIR INJECTION CONTROL DRIVER - BODY GROUND)

(a) Check the harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR INJECTION CONTROL DRIVER

5.	CHECK POWER SOURCE OF AIR INJECTION CONTROL DRIVER

(a) Disconnect the A56 Air Injection Control Driver (AID) connector.

(b) Turn the ignition switch ON.

Standard voltage:

Tester Connection	Specified Condition
A56-5 (+B) - A56-1 (GND)	10 V or more

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT AIR INJECTION CONTROL DRIVER (DI TERMINAL VOLTAGE)

(a) Disconnect the A56 AID connector.

(b) Turn the ignition switch ON.

Standard voltage:

Tester Connection	Specified Condition
A56-2 (DI) - Body ground	10 V or more

(d) Reconnect the AID connector.

REPLACE AIR INJECTION CONTROL DRIVER

7.	CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)

(a) Check the harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM

8.	CHECK HARNESS AND CONNECTOR (AIR INJECTION DRIVER - BODY GROUND)

(a) Disconnect the A56 AID connector.

(b) Measure the resistance between the terminal GND (A56-1) of the AID connector and body ground.

Standard resistance:

Tester Connection	Specified Condition
A56-1 (GND) - Body ground	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	REPLACE AIR INJECTION CONTROL DRIVER

(a) Replace the AID .

10.	CHECK WHETHER DTC OUTPUT RECURS (DTC P1613)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the tester ON.

(d) Start the engine.

(e) Perform ACTIVE TEST to operate the air injection system.

Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC.

(f) After operating the secondary air injection system, confirm the pending codes of the secondary air injection system by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

NOTICE:

When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

OK:

DTC P1613 for the secondary air injection system is not output.

GO TO DTC CHART

END