Toyota Yaris: Sfi System / Air Intake Control Valve Circuit Short to Ground or Open (P166014)

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Air Intake Control Valve Circuit Short to Ground or Open (P166014)

DESCRIPTION

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range. When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm, the ECM activates VSV and opens the AICV.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P166014

Air Intake Control Valve Circuit Short to Ground or Open

Voltage of terminal air intake control valve of the ECM is low when the VSV is not operating for 3 seconds or more (1 trip detection logic).

  • Open or short in vacuum switching valve assembly (for AICV) circuit
  • Vacuum switching valve assembly (for AICV)
  • EFI-MAIN NO. 1 relay
  • ECM

-

SAE: P1660

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. 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.

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR AICS)

*1

Air

*2

Port E

*3

Port F

*4

Air Filter

*a

Vacuum Switching Valve is On

*b

Vacuum Switching Valve is Off

(a) Disconnect the vacuum hose (port F) from the vacuum switching valve assembly (for AICV).

(b) Enter the following menus.

Powertrain > Engine > Active Test

Tester Display

Activate the VSV for AICS

(c) Check the operation of the vacuum switching valve assembly (for AICV) when the vacuum switching valve assembly (for AICV) is operated using the GTS.

Standard:

GTS Connection

Specified Condition

ON

Air from port E flows out through port F

OFF

Air from port E flows out through the air filter

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)

Click here

NG

REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)

OK

3.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))

(a) Disconnect the vacuum switching valve assembly (for AICV) connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D98-2(+B) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Vacuum Switching Valve Assembly (for AICV))

NG

GO TO STEP 5

OK

4.

CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV) - ECM)

(a) Disconnect the vacuum switching valve assembly (for AICV) connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D98-1(AIRV) - D104-49(AICV)

Always

Below 1 Ω

D98-1(AIRV) or D104-49(AICV) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT EFI-MAIN NO. 1 RELAY

Click here

NG

REPLACE EFI-MAIN NO. 1 RELAY

OK

6.

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO.1 RELAY)

(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block assembly.

*1

No. 1 Engine Room Relay Block Assembly

*2

EFI-MAIN NO. 1 Relay

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

3 (EFI-MAIN NO. 3 relay) - Body ground

Always

11 to 14 V

1 (EFI-MAIN NO. 3 relay) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY)

OK

7.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))

(a) Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO. 3 relay and EDU relay from the No. 1 engine room relay block assembly.

HINT:

Remove the EFI-MAIN NO. 3 relay and EDU relay connected between the checked terminals as the coil inside the relay influences the measurement value.

(b) Disconnect the vacuum switching valve assembly (for AICV) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

5(EFI-MAIN NO.1 relay) - D98-2 (+B)

Always

Below 1 Ω

5(EFI-MAIN NO.1 relay) or D98-2 (+B) - Body ground and other terminals

Always

10 kΩ or higher

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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