Sfi System - P2440

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Monitor result

  7. Wiring diagram

  8. Inspection procedure

  9. Check any other dtcs output (in addition to secondary air injection system dtcs)

  10. Check air switching valve (operation)

  11. Check air switching valve (voltage)

  12. Check harness and connector (air injection control driver - air switching valve)

  13. Check air injection control driver (voltage)

  14. Check harness and connector (air injection control driver - ecm)

  15. Check no. 2 air switching valve (operation)

  16. Check vsv (for air injection system)

  17. Check no. 2 air switching valve (operation)

  18. Check vsv (for air injection system)

  19. Check harness and connector (ecm - vsv for air injection system)

DTC P1441 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1

DTC P1444 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2

DTC P2440 Secondary Air Injection System Switching Valve Stuck Open Bank1


​

DESCRIPTION

Refer to DTC P0412 (Click here).

DTC No.
DTC Detection Condition
Trouble Area
P1441
No. 2 air switching valve (bank 1) stuck open:
The pressure sensor detects exhaust pulsation, when both of No. 2 air switching valve OFF (and air switching valve ON).
(2 trip detection logic)
  1. VSV for air injection system circuit (bank 1)
  2. No. 2 air switching valve (bank 1)
  3. VSV for air injection system (bank 1)
  4. ECM
P1444
No. 2 air switching valve (bank 2) stuck open:
The pressure sensor detects exhaust pulsation, when both of No. 2 air switching valve OFF (and air switching valve ON).
(2 trip detection logic)
  1. VSV for air injection system circuit (bank 2)
  2. No. 2 air switching valve (bank 2)
  3. VSV for air injection system (bank 2)
  4. ECM
P2440
No. 2 air switching valve stuck open:
The pressure sensor detects exhaust pulsation when the system is not operating (both of No. 2 air switching valve OFF, and air switching valve OFF and air pump OFF).
This DTC means air switching valve and "No. 2 air switching valve bank 1 or bank 2" are stuck open.
(1 trip detection logic)
  1. Air switching valve (ASV)
  2. No. 2 air switching valve (Bank 1 and/or 2)
  3. VSV for air injection system (bank 1 and/or 2)
  4. Air injection control driver (AID)
  5. Air injection control driver circuit
  6. ECM

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 that the pump operates. When exhaust pulsation is detected, the ECM determines that the Air Switching Valve (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 No. 2 Air Switching Valve (No. 2 ASV) 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 No. 2 ASV is malfunctioning 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) 4Runner

  1. Pressure condition in Secondary Air Injection System (Point C and F)

Pattern 1:
Air Pump
ON
Air Switching Valve and No. 2 Air Switching Valve
Open
Pressure
1 kPa or more
Pulsation detection
Exhaust gas pulsation detected

Pattern 2:
Air Pump
OFF
Air Switching Valve and No. 2 Air Switching Valve
Open
Pressure
Less than 5 kPa
Pulsation detection
Exhaust gas pulsation detected

Pattern 3:
Air Pump
ON
Air Switching Valve and No. 2 Air Switching Valve
Closed
Pressure
1 kPa or more
Pulsation detection
Slight pulsation detected

Pattern 4:
Air Pump
OFF
Air Switching Valve and No. 2 Air Switching Valve
Closed
Pressure
Less than 5 kPa
Pulsation detection
Not detected

Judgment and decision of failure mode:
Monitor
Judgment
C
F
A
B
D
E
DTCs that may be set
Pattern 1
Pattern 1
Pressure changed
Pressure changed
-
No pulsation detected
P2444, P1441 and P1444
Pattern 1
Pattern 1
No pressure changed
Pressure changed
-
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
No pressure changed
Pressure changed
-
No pulsation detected
P1441 or P1444
Pattern 1
Pattern 2
Pressure changed
No pressure changed
Pulsation detected
No pulsation detected
P1441 and P1444
Pattern 1
Pattern 2
No pressure changed
No pressure changed
Pulsation detected
No pulsation detected
P1441 and P1444
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
Pressure changed
No pressure changed
No pulsation detected
No pulsation detected
P2444 and "P1442 or P1445"
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
P1442 or P1445
Pattern 1
Pattern 4
No pressure changed
Pressure changed
-
No pulsation detected
P1442 or P1445
Pattern 1
Pattern 4
No pressure changed
No pressure changed
Pulsation detected
No pulsation detected
P1442 or P1445
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"

MONITOR STRATEGY


Related DTCs
(Case 1) P1444 AIR VSV stuck open bank 1
(Case 2) P1444 AIR VSV stuck open bank 2
(Case 3) P1441, P1444 AIR VSVs stuck open
(Case 4) P2440 AIR valve stuck open
(Case 5) P2440 AIR valve and AIR VSVs stuck open
Required sensors/Components (main)
AIR valve, AIR VSV bank 1, AIR VSV bank 2
Required sensors/Components (sub)
AIR pressure sensor
Frequency of operation
Once per driving cycle
Duration
Within 60 seconds
MIL operation
P1441, P1444: 2 driving cycles
P2440: Immediate
Sequence operation
None

TYPICAL ENABLING CONDITIONS


All:
This monitor will run whenever these DTC are not present
P0010 - P0022 (VVT system)
P0031 - P0052 (A/F sensor heater)
P0100 - P0103 (MAF sensor)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Closed loop)
P0171, P0172 (Fuel trim)
P0300 - P0308 (Misfire)
P0327 - P0333 (Knock sensor)
P0335 (CKP sensor)
P0340 - P0346 (VVT sensor)
P0351 - P0358 (Ignitor)
P0455, P0456 (EVAP system)
P0450, P0453 (EVAP press sensor)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2430 - P2433 (AIR pressure sensor)
P2A00, P2A03 (A/F sensor - slow response)

Conditions for case 1, case 2 and case 4:
Atmospheric pressure
45 kPa (338 mmHg) or more
Battery voltage
11.5 V or higher
Monitor Sequence 1
AIR pump
ON
AIR valve
ON
Either of following conditions is met
Condition 1 or 2
1. Both of the following conditions are met
Condition (a) and (b)
(a) AIR valve bank 1 (vacuum type)
ON
(b) AIR valve bank 2 (vacuum type)
OFF
2. Both of the following conditions are met
Condition (c) and (d)
(c) AIR valve bank 1 (vacuum type)
OFF
(d) AIR valve bank 2 (vacuum type)
ON
Monitor Sequence 2
Idle
ON
AIR valve (electric type)
ON
AIR valve bank 1(vacuum type)
ON
AIR valve bank 2 (vacuum type)
ON
Monitor Sequence 3
Engine RPM
Less than 3,750 rpm
AIR pump
ON
AIR valve (electric type)
ON
AIR valve bank 1 (vacuum type)
ON
AIR valve bank 2 (vacuum type)
ON
Monitor Sequence 4
Runs when AIR pressure did not change at monitor
Engine RPM
Less than 3,750 rpm
AIR
OFF
AIR pump
ON
AIR valve (electric type)
ON
Either of following conditions is met
Condition 1 or 2
1. Both of the following conditions are met
Condition (a) and (b)
(a) AIR valve bank 1 (vacuum type)
ON
(b) AIR valve bank 2 (vacuum type)
OFF
2. Both of the following conditions are met
Condition (c) and (d)
(c) AIR valve bank 1 (vacuum type)
OFF
(d) AIR valve bank 2 (vacuum type)
ON
Monitor Sequence 4
Engine RPM
Less than 3,750 rpm
AIR
Not operating
AIR pump
OFF
AIR valve (electric type)
OFF
AIR valve bank 1 (vacuum type)
OFF
AIR valve bank 2 (vacuum type)
OFF
Monitor Sequence 5
Engine RPM
Less than 3,750 rpm
AIR
Not operating
AIR pump
OFF
AIR valve (electric type)
OFF
AIR valve bank 1 (vacuum type)
OFF
AIR valve bank 2 (vacuum type)
OFF
Monitor sequence 6
AIR status
Not operating
AIR pump
OFF
AIR valve (electric type)
ON
AIR valve (vacuum type) bank 1
OFF
AIR valve (vacuum type) bank 2
OFF
Engine RPM
Less than 3,750 rpm

Conditions for case 3:
Atmospheric pressure
45 kPa (338 mmHg) or more
Battery voltage
11.5 V or more
AIR pump
OFF
Time after engine start
10 seconds or more
AIR VSV bank 1
OFF
AIR VSV bank 2
OFF
AIR status
OFF
Engine load
0 % or more
Intake air amount
40 g/sec. or more
IAT at engine start
-15°C (5°F) or more
ECT at engine start
Less than 5°C (41°F)
AIR valve (electric type)
ON
Engine RPM
Less than 3,750 rpm

Conditions for case 5:
Cumulative intake air amount
172 g/sec. or more
AIR pump
OFF
AIR valve
OFF
AIR VSV bank 1
OFF
AIR VSV bank 2
OFF
Engine RPM
Less than 3,750 rpm
AIR pressure sensor malfunction (open circuit, out of range)
Not detected
AIR status
OFF

TYPICAL MALFUNCTION THRESHOLDS


Case 1:
Both of the following conditions are met:
Condition 1 and 2
1. One of the following conditions is met:
Condition (a), (b) or (c)
(a) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
1 kPa (7.5 mmHg) or more and pulse is operated
AIR pressure during monitor sequence 6
Less than 5 kPa (37.5 mmHg) and pulse is operated
(b) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
1 kPa (7.5 mmHg) or more and pulse is operated
AIR pressure during monitor sequence 6
5 kPa (37.5 mmHg) or more and pulse is operated
(c) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
Less than 1 kPa (7.5 mmHg) and pulse is operated
AIR pressure during monitor sequence 6
Less than 5 kPa (37.5 mmHg) and pulse is operated
2. One of the following conditions is met:
Condition (d), (e) or (f)
(d) Both of the following conditions are met:
-
AIR pressure during monitor sequence 1
Change
AIR pressure during monitor sequence 2
Change
(e) AIR pressure during monitor sequence 1
(When AIR VSV bank 1 is open)
No change
(f) AIR pressure during monitor sequence 2
(When AIR VSV bank 1 is open)
No change

Case 2:
Both of the following conditions are met:
Condition 1 and 2
1. One of the following conditions is met:
Condition (a), (b) or (c)
(a) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
1 kPa (7.5 mmHg) or more and pulse is operated
AIR pressure during monitor sequence 6
Less than 5 kPa (37.5 mmHg) and pulse is operated
(b) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
1 kPa (7.5 mmHg) or more and pulse is operated
AIR pressure during monitor sequence 6
5 kPa (37.5 mmHg) or more and pulse is operated
(c) Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
Less than 1 kPa (7.5 mmHg) and pulse is operated
AIR pressure during monitor sequence 6
Less than 5 kPa (37.5 mmHg) and pulse is operated
2. One of the following conditions is met:
Condition (d), (e) or (f)
(d) Both of the following conditions are met:
-
AIR pressure during monitor sequence 1
Change
AIR pressure during monitor sequence 2
Change
(e) AIR pressure during monitor sequence 1
(When AIR VSV bank 2 is open)
No change
(f) AIR pressure during monitor sequence 2
(When AIR VSV bank 2 is open)
No change

Case 3:
AIR pressure
Pulse is generated

Case 4:
Both of the following conditions are met:
-
AIR pressure during monitor sequence 3
Less than 1 kPa (7.5 mmHg) and pulse is operated
AIR pressure during monitor sequence 5
No pulse is generated

Case 5:
AIR pressure
Pulse is operated

MONITOR RESULT

Refer to Checking Monitor Status (Click here).
The test value and test limit information are described as shown in the following table. Check the monitor result and test values after performing the monitor drive pattern (refer to "Confirmation Monitor").
  1. MID (Monitor Identification Data) is assigned to each emissions-related component.
  2. TID (Test Identification Data) is assigned to each test value.
  3. Scaling is used to calculate the test value indicated on generic OBD II scan tools.

    Secondary air injection (AIR) system
    MID
    		TID
    		Scaling
    		Description of Test Value
    		Minimum Test Limit
    		Maximum Test Limit
    $71
    		$E1
    		Multiply by 0.01 (g/s)
    		Test value of AIR amount insufficient
    		Minimum test limit
    		Maximum test limit
    $71
    		$E2
    		Multiply by 0.01 (kPa)
    		Test value of AIR pump stuck ON
    		Minimum test limit
    		Maximum test limit
    $71
    		$E3
    		Multiply by 0.01 (kPa)
    		Test value of AIR pump stuck OFF
    		Minimum test limit
    		Maximum test limit
    $71
    		$E9
    		Multiply by 0.01 (kPa)
    		Test value of AIR control valve ON
    		Minimum test limit
    		Maximum test limit
    $71
    		$E5
    		Multiply by 0.01 (kPa)
    		Test value of AIR control valve OFF
    		Minimum test limit
    		Maximum test limit
    $71
    		$E6
    		Multiply by 0.01 (kPa)
    		Test value of AIR pressure change for AIR valve
    		Minimum test limit
    		Maximum test limit
    $71
    		$E7
    		Multiply by 0.01 (kPa)
    		Test value of AIR pressure change for AIR VSV bank 1
    		Minimum test limit
    		Maximum test limit
    $71
    		$E5
    		Multiply by 0.01 (kPa)
    		Test value of AIR pressure change for AIR VSV bank 2
    		Minimum test limit
    		Maximum test limit
    $71
    		$E9
    		Multiply by 0.01 (kPa)
    		Test value of AIR pressure pulsation for AIR VSV when AIR pressure is low
    		Minimum test limit
    		Maximum test limit

WIRING DIAGRAM

Refer to DTC P0412 (Click here).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR INJECTION SYSTEM DTCS)

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. Read DTCs.

    Result:

    Display (DTC Output)
    		Proceed To
    "P1441 and/or P1444" and P2440
    		A
    P1441 and/or P1444
    		B
    "P1441 and/or P1444 and/or P2440" and other DTCs
    		C
    HINT:
    If any DTCs other than P1441, P1444 or P2440 are output, troubleshoot those DTCs first.


Bnext
Go to step 7

Cnext
GO TO DTC CHART
A
next down

2.CHECK AIR SWITCHING VALVE (OPERATION)
  1. Remove the intake manifold (Click here). 4Runner

  2. Remove the intake manifold (Click here).

  1. Remove the Air Switching Valve (ASV).

  1. Blow air into port A and check that air is not discharged from port B.

    OK:
    Not discharged
  1. Apply battery positive voltage across the terminals. 4Runner

  2. Apply battery positive voltage across the terminals.

  1. Blow air into port A and check that air is discharged from port B.

    OK:
    Discharged


NGnext
REPLACE AIR SWITCHING VALVE
OK
next down

3.CHECK AIR SWITCHING VALVE (VOLTAGE)
  1. Remove the intake manifold (Click here). 4Runner

  2. Remove the intake manifold (Click here).

  1. Disconnect the A47 ASV connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between terminal 1 of the air switching valve connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A47-1 - Body ground
    		Below 1.0 V

  1. Reconnect the ASV connector.



NGnext
Go to step 4
OK
next down
CHECK FOR INTERMITTENT PROBLEMS

4.CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - AIR SWITCHING VALVE)
  1. Remove the intake manifold (Click here). 4Runner

  2. Remove the intake manifold (Click here).

  1. Disconnect the A44 air injection driver connector.

  1. Disconnect the A47 air switching valve connector.

  1. Disconnect the battery positive terminal cable.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    VV (A44-6) - A47-1
    		Below 1 Ω
    VV (A44-6) or A47-1 - Battery positive terminal cable
    		10 kΩ or higher

  1. Reconnect the air injection driver connector.

  1. Reconnect the ASV connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

5.CHECK AIR INJECTION CONTROL DRIVER (VOLTAGE)
  1. Disconnect the A44 Air Injection Control Driver (AID) connector. 4Runner

  2. Disconnect the A44 Air Injection Control Driver (AID) connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between terminal 3 (SIV) of the AID connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    SIV (A41-3) - Body ground
    		10 V or more

  1. Reconnect the AID connector.



NGnext
Go to step 6
OK
next down
REPLACE AIR INJECTION CONTROL DRIVER

6.CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - ECM)
  1. Disconnect the air injection driver connector. 4Runner

  2. Disconnect the air injection driver connector.

  1. Disconnect the E9 ECM connector.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    SIV (A44-3) - AIRV (E9-4)
    		Below 1 Ω
    SIV (A44-3) or AIRV (E9-4) - Body ground
    		10 kΩ or higher

  1. Reconnect the air injection driver connector.

  1. Reconnect the ECM connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM

7.CHECK NO. 2 AIR SWITCHING VALVE (OPERATION)
  1. Start the engine and warm it up. 4Runner

  2. Start the engine and warm it up.

  1. Turn the ignition switch OFF.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Start the engine and push the the intelligent tester main switch ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 5 and 6.

    HINT:
    OPERATION 5: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: CLOSE
    OPERATION 6: AP: ON; EASV: OPEN; ASV1: CLOSE; ASV2: OPEN
    NOTICE:
    1. This test only allows technicians to operate the AIR system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
      While the AIR system operation using the 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.
    2. 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.
    3. Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

  1. Read values of the A/F BANK1 and BANK2 on the the intelligent tester.

    Result:

    Air switching valve No. 2 operation
    		Air fuel ratio
    Open
    		18 or more
    Closed
    		Approximately 14.5
    HINT:
    1. When the No. 2 ASV operates normally, the A/F value is 18 or more when the valve is open, and approximately 14.5 when the valve is closed.
    2. Perform the following procedures only on the bank of which the valve is not closed.

NEXT
next down

8.CHECK VSV (FOR AIR INJECTION SYSTEM)
  1. Turn the ignition switch OFF. 4Runner

  2. Turn the ignition switch OFF.

  1. Disconnect the vacuum hose from the VSV for air injection system.

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Start the engine and turn the tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1.

  1. At this time, check that no negative pressure generates at port A of the VSV.

    HINT:
    OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE
    NOTICE:
    1. This test only allows technicians to operate the AIR system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
      While the AIR system operation using the 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.
    2. 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.
    3. Turn the ignition switch to OFF when the AIR INJ CHECK operation finishes.
    OK:
    No negative pressure is generated.

  1. Reconnect the vacuum hose.



NGnext
Go to step 10
OK
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9.CHECK NO. 2 AIR SWITCHING VALVE (OPERATION)
  1. Remove the No. 2 air switching valve. 4Runner

  2. Remove the No. 2 air switching valve.

  1. Blow air into port B and check that air is not discharged from port C.

    OK:
    Not discharged from port C
  1. Apply vacuum 30 kPa (225 mmHg) to port A, blow air into port B and check that air is discharged from port C.OK:Discharged from port C 4Runner

  2. Apply vacuum 30 kPa (225 mmHg) to port A, blow air into port B and check that air is discharged from port C.

    OK:
    Discharged from port C


NGnext
REPLACE NO. 2 AIR SWITCHING VALVE
OK
next down
CHECK FOR INTERMITTENT PROBLEMS

10.CHECK VSV (FOR AIR INJECTION SYSTEM)
  1. Disconnect the 2 vacuum hoses. 4Runner

  2. Disconnect the 2 vacuum hoses.

  1. Disconnect the VSV for air injection system connector.

  1. Blow air into port B and check that air does not flow from port A.

    OK:
    Air does not flow from port A

  1. Apply battery positive voltage across the terminals. Then blow air into port B and check that air flows from port A.

    OK:
    Air flows from port A


NGnext
REPLACE VSV
OK
next down

11.CHECK HARNESS AND CONNECTOR (ECM - VSV FOR AIR INJECTION SYSTEM)
  1. Remove the intake manifold (Click here). 4Runner

  2. Remove the intake manifold (Click here).

  1. Disconnect the E5 ECM connector.

  1. Disconnect the V10 and V11 VSV for air injection system control connector.

  1. Measure the resistance between the VSV connector and ECM.

    Standard resistance:
    Tester connection
    		Specified condition
    AIV1 (E5-27) - V10-2
    		Below 1 Ω
    AIV1 (E5-26) - V11-2
    		Below 1 Ω

  1. Measure the resistance between the VSV connector and body ground.

    Standard resistance:
    Tester connection
    		Specified condition
    AIV1 (E5-27) or V10-2 - Body ground
    		10 kΩ or higher
    AIV1 (E5-26) or V11-2 - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the VSV connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM