Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Fuel injection (fuel systems)(h4do) / Throttle body / Inspection

1. THROTTLE SENSOR (METHOD WITH CIRCUIT TESTER)

1. Disconnect the ground terminal from battery sensor. NOTE

2. While pressing the section (A) shown in the figure, move the lock lever (B) in the direction of the arrow to disconnect the connectors from the ECM in numerical order as shown in the figure.

3. Attach the ST between the ECM, engine harness and the bulkhead wiring harness. General Description > CAUTION

ST 18460AA050

CHECK BOARD

4. Connect the ground terminal to battery sensor. NOTE

5. Turn the ignition switch to ON. (Engine OFF)

6. Measure the voltage between ECM connector terminals using ST.

(A)

To the check board connector (ECM connector)

Throttle sensor	Accelerator pedal	Terminal No.	Standard
Main	Not depressed (full closed)	29 (+) and 34 (−)	Approx. 0.6 — 1.2 V
Main	Depressed (full opened)	29 (+) and 34 (−)	Approx. 3.8 — 4.4 V
Sub	Not depressed (full closed)	31 (+) and 34 (−)	Approx. 1.4 — 2.0 V
Sub	Depressed (full opened)	31 (+) and 34 (−)	Approx. 4.0 — 4.6 V

7. After inspection, install the related parts in the reverse order of removal.

2. THROTTLE SENSOR (METHOD WITH SUBARU SELECT MONITOR)

1. Turn the ignition switch to ON. (Engine OFF)

2. Read the throttle opening angle signal and voltage of throttle sensor using Subaru Select Monitor. Subaru Select Monitor > OPERATION

Throttle sensor	Throttle opening angle signal	Standard
Main	0.0%	Approx. 0.6 — 1.2 V
Main	100.0%	Approx. 3.8 — 4.4 V
Sub	0.0%	Approx. 1.4 — 2.0 V
Sub	100.0%	Approx. 4.0 — 4.6 V

3. OTHER INSPECTIONS

1. Check that the throttle body has no deformation, cracks or other damages.

2. Check that the preheater hose has no cracks, damage or loose part.

Removal

1. Disconnect the ground terminal from battery sensor. NOTE2. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Engine Coolant > REPLACEMENT3. Remove the clip (A), and loosen the clamps ...

Installation

1. Install the throttle body to the intake manifold assembly.NOTE:Use a new gasket.Tightening torque:8 N·m (0.8 kgf-m, 5.9 ft-lb)2. Connect the connector to the throttle position sensor.3. Conn ...

Other materials:

Read diagnostic trouble code (dtc) operation
1. On «Start» display, select «Diagnosis».2. On «Vehicle selection» display, input the target vehicle information and select «Confirmed».3. On «Main Menu» display, select «Each System».4. On «Select System» display, select «Air Conditioner» and select «Enter».5. On «Select Functio ...