Toyota Corolla 2004 Repair Manual - SFI SYSTEM

10–2

INSPECTION

–ENGINE CONTROL SYSTEM SFI SYSTEM

1008E–02

E2 THA

Air

Ohmmeter

A65170

VG E2G

Voltmeter

A66622

1. INTAKE AIR FLOW METER SUB–ASSY

(a) Inspect the intake air flow meter resistance.

(1) Using an ohmmeter, measure the resistance be-

tween terminals THA and E2.

Resistance:
At –20C (–4F) 13.6 to 18.4 kΩ
At 20C (68F) 2.21 to 2.69 kΩ
At 60C (140F) 0.49 to 0.67 kΩ

HINT:
If the resistance is not as specified, replace the intake air flow
meter.

(b) Inspect the intake air flow meter operation.

(1) Connect the intake air flow meter connector.
(2) Turn the ignition switch to ON.
(3) Using a voltmeter, connect the positive (+) tester

probe to terminal VG, and negative (–) tester probe
to terminal E2G.

(4) Blow air into the intake air flow meter, and check that

the voltage fluctuates.
HINT:
If operation is not as specified, replace the intake air flow meter.

(5) Turn the ignition switch to LOCK.
(6) Disconnect the intake air flow meter connector.

2. CAMSHAFT TIMING OIL CONTROL VALVE ASSY

(a) Resistance inspection.

(1) Using an ohmmeter, measure the resistance be-

tween the terminals.

Resistance: 6.9 to 7.9 Ω at 20C (68F)

Valve

2004 COROLLA (RM1037U)

1

2

(b) Movement inspection.

(1) Connect the positive (+) lead from the battery to ter-

minal 1 and negative (–) lead to terminal 2, and

check the movement of the valve.

NOTICE:
Confirm the valve does not adhere.

HINT:
Bad returning of the valve by entrance of foreign objects causes

B01689

subtle pressure leak to the advanced direction. Then, DTC can
be detected.

956Author: Date:

–ENGINE CONTROL SYSTEM SFI SYSTEM

10–3

Throttle Lever

VTA E2 VC

Throttle Stop Screw

23

A66635

1

A65173

3. THROTTLE BODY ASSY

(a) Check throttle body.

(1) Check that throttle valve shaft is not rickety.
(2) Check that each port is not stopped up.
(3) Check that throttle valve opens and closes smooth-

ly.

(4) Check that there is no clearance between the

throttle stop screw and throttle lever at the throttle

closed position.

NOTICE:
Do not adjust the throttle stop screw.

4. E.F.I. THROTTLE POSITION SENSOR

(a) Resistance inspection.

(1) Disconnect the throttle position sensor connector.
(2) Using an ohmmeter, measure the resistance be-

tween terminals VC and E2.

Resistance: 2.5 to 6.0 kΩ

(3) Check the change of resistance between terminals

VTA and E2.

Change of resistance:
The resistance value increases in proportion to the
throttle lever opening value.

HINT:

Throttle valve Resistance

Fully close 0.2 to 5.7 kΩ
Fully open 2.0 to 10.2 kΩ

2004 COROLLA (RM1037U)

957Author: Date: