10 - Engine Control System.pdf

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10–1
ENGINE CONTROL SYSTEM
–
SFI SYSTEM
SFI SYSTEM
ON–VEHICLE INSPECTION
1008D–01
Open
1. INSPECTION THROTTLE BODY IDLE SPEED
CONTROL VALVE ASSY
NOTICE:
Close
It is impossible to check the resister value and the op-
eration of ISC valve by itself, because the ISC valve
has an IC circuit inside it, which transforms the duty
signal from the ECM to the derive signal.
Valve
After checking, erase the DTC.
Clear the DTC after inspection.
Valve
HINT:
When the ISC valve system has malfunctions except for its ad-
herence, DTC P0505 is detected.
(a) Operation inspection.
(1) Connect the ISC connector to the ISC valve.
(2) Check the ISC valve movement when the ignition
switch is turned ON.
Movement:
Half open
"
fully close
"
fully open
"
half open
A50374
HINT:
ISC valve moves within 0.5 second.
2004 COROLLA (RM1037U)
Author:
Date:
955
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10–2
ENGINE CONTROL SYSTEM
–
SFI SYSTEM
INSPECTION
1008E–02
E2
THA
Ohmmeter
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 k
W
At 20 C (68 F) 2.21 to 2.69 k
W
At 60 C (140 F) 0.49 to 0.67 k
W
A65170
HINT:
If the resistance is not as specified, replace the intake air flow
meter.
VG E2G
(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.
Voltmeter
Air
A66622
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
W
at 20 C (68 F)
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.
Valve
B01689
NOTICE:
Confirm the valve does not adhere.
HINT:
Bad returning of the valve by entrance of foreign objects causes
subtle pressure leak to the advanced direction. Then, DTC can
be detected.
2004 COROLLA (RM1037U)
Author:
Date:
956
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10–3
ENGINE CONTROL SYSTEM
–
SFI SYSTEM
Throttle Stop Screw
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.
Throttle Lever
A66635
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 k
W
(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.
VTA E2 VC
2
3
1
A65173
HINT:
Throttle valve
Resistance
Fully close
0.2 to 5.7 k
W
Fully open
2.0 to 10.2 k W
2004 COROLLA (RM1037U)
Author:
Date:
957
256352749.002.png
 
10–4
ENGINE CONTROL SYSTEM
–
SFI SYSTEM
Ohmmeter
5. E.F.I. ENGINE COOLANT TEMPERATURE SENSOR
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-
tween each terminal.
Resistance:
At 20 C (68 F) 2.32 – 2.59 k
W
At 80 C (176 F) 0.310 – 0.326 k
W
3 20
10
5
NOTICE:
In case of checking the water temperature sensor in the wa-
ter, be careful not to allow water to go into the terminals,
and after checking, wipe out the sensor.
3
2
1
0.5
0.3
0.2
0.1
–20 0 20 40 60 80 100
(–4) (32) (80)
(104)
(140)
(176)
(212)
TEMPERATURE
C(
F)
A50371
Ohmmeter
6. KNOCK CONTROL SENSOR
(a) Using an ohmmeter, measure the resistance between ter-
minals.
Resistance: 120 – 280 k
W
at 20 C (68 F)
HINT:
If the resistance is not specified, replace the sensor.
A65174
E12471
7. E.F.I. CIRCUIT OPENING RELAY ASSY
(a) Continuity inspection.
(1) Using an ohmmeter, check that continuity exists be-
tween each terminal.
Specified condition:
Between terminals 1 and 2 Continuity
Between terminals 3 and 5 No continuity
(2) Using an ohmmeter, check that continuity exists be-
tween terminals 3 and 5 when the battery voltage is
applied across terminals 1 and 2.
8. E.F.I ECU RELAY
(a) Continuity inspection.
(1) Using an ohmmeter, check that continuity exists be-
tween each terminal.
Specified condition:
Between terminals 1 and 2 Continuity
Between terminals 3 and 5 No continuity
(2) Using an ohmmeter, check that continuity exists be-
tween terminals 3 and 5 when the battery voltage is
applied across terminals 1 and 2.
E12471
2004 COROLLA (RM1037U)
Author:
Date:
958
256352749.003.png
10–5
ENGINE CONTROL SYSTEM
–
THROTTLE BODY ASSY
THROTTLE BODY ASSY
COMPONENTS
1008F–01
7.0 (71, 62 in.·lbf)
Clip
Vacuum Hose
Cylinder Head
Cover No. 2
Vacuum Hose
Air Cleaner Hose No. 1
Manifold Stay No. 2 (M/T)
13 (133, 9.6)
Water By–pass Hose
30 (306, 22)
Gasket
Accelerator Control
Cable Bracket Sub–assy
Water By–pass
Hose
30 (306, 22)
Air Cleaner Cap
13 (133, 9.6)
30 (306, 22)
Accelerator
Control Cable Assy
30 (306, 22)
Throttle Body Bracket
2.0 (20, 18 in.·lbf)
E.F.I. Throttle Position Sensor
Throttle Body Assy
Gasket
Throttle Body Idle Speed Control Valve Assy
3.7 (38, 33 in.·lbf)
N·m (kgf·cm, ft·lbf) : Specified torque
Non–reusable part
A65206
2004 COROLLA (RM1037U)
Author:
Date:
959
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