Sfi System - P1443

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. Wiring diagram

  7. Inspection procedure

  8. Check harness and connector (air injection system power source)

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

  10. Check vsv (resistance)

DTC P1440 Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 1

DTC P1443 Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2


​

DESCRIPTION

Refer to DTC P0412 (Click here).

DTC No.
DTC Detection Condition
Trouble Area
P1440
AIV1 terminal voltage becomes less than half of the +B voltage while the VSV for air injection system is not operating.
(1 trip detection logic)
  1. Open or short in VSV for air injection system circuit (bank 1)
  2. VSV power source
  3. VSV for air injection system (bank 1)
  4. ECM
P1443
AIV2 terminal voltage becomes less than half of the +B voltage while the VSV for air injection system is not operating.
(1 trip detection logic)
  1. Open or short in VSV for air injection system circuit (bank 2)
  2. VSV power source
  3. VSV for air injection system (bank 2)
  4. ECM

MONITOR DESCRIPTION

The ECM detects an open or short in the circuit of the VSV for air injection system according to the AIV1 (AIV2) terminal voltage, stores the DTC, and then illuminates the MIL. When the AIV1 (AIV2) terminal voltage is less than half of the +B voltage while the VSV for air injection system is not operating, the ECM determines it as a malfunction.

MONITOR STRATEGY


Related DTCs
P1440: Secondary air injection system control valve circuit (bank 1) range check
P1443: Secondary air injection system control valve circuit (bank 2) range check
Required sensors/components
VSV for air injection control
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
Immediate
Sequence operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever these DTCs are not present
None

P1440:
Engine
Running
No. 2 air switching valve (bank 1)
Not operating

P1443:
Engine
Running
No. 2 air switching valve (bank 2)
Not operating

TYPICAL MALFUNCTION THRESHOLDS


P1440:
No. 2 air switching valve (bank 1) output terminal level
Low

P1443:
No. 2 air switching valve (bank 2) output terminal level
Low

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 HARNESS AND CONNECTOR (AIR INJECTION SYSTEM POWER SOURCE)
  1. Disconnect the V10 or V11 VSV for air injection system connector. 4Runner

  2. Disconnect the V10 or V11 VSV for air injection system connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between terminal 1 of the VSV connector and body ground.

    Standard:
    9 V or more

  1. Reconnect the VSV for air injection system connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

2.CHECK HARNESS AND CONNECTOR (ECM - VSV FOR AIR INJECTION SYSTEM)
  1. Disconnect the E5 ECM connector. 4Runner

  2. Disconnect the E5 ECM connector.

  1. Disconnect the VSV for air injection 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
    AIV2 (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 for air injection control connectors.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

3.CHECK VSV (RESISTANCE)
  1. Disconnect the V10 or V11 VSV for air injection system connector. 4Runner

  2. Disconnect the V10 or V11 VSV for air injection system connector.

  1. Disconnect the 2 vacuum hoses from the VSV.

  1. Measure the resistance of the VSV terminals.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1 - 2
    		33 to 39 Ω at 20°C (68°F)
    1 - Body ground
    		10 kΩ or higher
    2 - Body ground
    		10 kΩ or higher

  1. Reconnect the VSV for air injection system connector.

  1. Reconnect the vacuum hose.



NGnext
REPLACE VSV
OK
next down
REPLACE ECM