sensor TOYOTA CAMRY V20 1986 Service Information

(b) (A/T)
Install the throttle cable bracket with the two bolts.
Torque: 130 kg±cm (9 ft±Ib, 13 N±m)
(c) Connect the following hoses:
wPCV hose
wWater by±pass hoses
wEmission control vacuum hoses
2. CONNECT THROTTLE POSITION SENSOR
CONNECTOR
3. INSTALL AIR CLEANER CAP, AIR FLOW METER AND
AIR CLEANER HOSE
(a) Connect the air cleaner hose, and install the air
cleaner cap and air flow meter with the four clips.
(b) Tighten the air cleaner hose clamp bolt.
(c) Connect the air hoses.
(d) Connect the air flow meter connector.
INSTALLATION OF THROTTLE BODY
1. INSTALL THROTTLE BODY
(a) Install a new gasket and the throttle body with the four
(M/T) or three (A/n bolts.
Torque: 130 kg±cm (9 ft±Ib, 13 N±m)
4. CONNECT ACCELERATOR CABLE, AND ADJUST IT
5. (A/T)
CONNECT THROTTLE CABLE, AND ADJUST IT
6. FILL WITH ENGINE COOLANT (See page CO±5)
± EFI SYSTEMAir Induction System (Throttle Body (2VZ±FE))FI±115

INSPECTION OF WATER TEMPERATURE
SENSOR
INSPECT RESISTANCE OF WATER TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between the
terminals.
Resistance: Refer to chart
If the resistance is not as specified, replace the sensor.
Water Temperature Sensor
± EFI SYSTEMElectronic Control System (Water Temperature Sensor)FI±125

INSPECTION OF EGR GAS TEMPERATURE
SENSOR
INSPECT EGR GAS TEMPERATURE SENSOR
Using an ohmmeter, measure the resistance between the terminals.
Resistance:
69.40 ± 88.50 k
at 50° C (11210 F)
11.89 ±14.37 k
at 100° C (212° F)
2.79 ± 3.59 k
at 150° C (302° F)
If the resistance is not as specified, replace the sensor.
EGR Gas Temperature Sensor
(CALIF. only)
± EFI SYSTEMElectronic Control System (EGR Gas Temperature Sensor
(CALIF. only)FI±126

3. INSPECT FUEL PRESSURE VSV
A. Inspect VSV for open circuit.
Using an ohmmeter, check that there is continuity between
terminals.
Resistance (Cold): 33 ± 39

If there is no continuity, replace the VSV.
INSPECTION OF FUEL PRESSURE
CONTROL SYSTEM.
1. INSPECT WATER TEMPERATURE SENSOR
(See page FI±49)
2. INSPECT INTAKE AIR TEMPERATURE SENSOR
(See page FI±37)
B. Inspect VSV for ground.
Using an ohmmeter, check that there is no continuity be-
tween each terminal and body.
If there is continuity, replace the VSV.
Fuel Pressure Control System
± EFI SYSTEMElectronic Control System (Fuel Pressure Control System)FI±127

Main Oxygen Sensor
INSPECTION OF OXYGEN SENSOR
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. INSPECT FEEDBACK VOLTAGE
Connect the positive (+) probe of a voltmeter to terminal VF1
of the check connector, and negative (±) probe to terminal
E1. Perform the test as follows:
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds. And maintain engine at
2,500 rpm.
Normal code, code Nos. Malfunction code(s)
21, 25 and 26 (Ex. code Nos. 21, 25 and 26y Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds.
Disconnect terminals TE1 and E1 of the check connector.
And maintain engine speed at 2,500 rpm.Connect terminals TE1 and E1 of the check connector.
And maintain engine speed at 2,500 rpm.
Check the number of times the voltmeter needle
fluctuates in 10 seconds.Check the number of times the voltmeter needle fluctuates in 10 seconds.
Read and record diagnostic codes. (See page FI±25 or 27)Zero again After replacing
the oxygen sensor
Measure voltage between terminals VF 1 and E 1.
Repair the relevant diagnostic code.
CONTINUED ON PAGE FI±30Less than 8 times
Less than 8 timesReplace the ECU.
8 times of more
More than 0 V
8 times or
more
NormalZero
Zero
± EFI SYSTEMElectronic Control System (Main Oxygen Sensor)FI±129

Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds. And maintain engine speed at
2,500 rpm.Disconnect the water temp. sensor connector and connect
resistor with a resistance of 4 ± 8 k

or another coded
water temp. sensor.Disconnect terminals TE1 and E1 of the check connector.
And maintain engine at 2,500 rpm.
Measure voltage between terminals VF 1 and El.Rear record diagnostic codes. (See page FI±25 or 27) CONTINUED FROM PAGE FI±129
Malfunction code(s)
(Ex. code Nos. 21, 25 and 26)
Connect terminals TE1 and E1 of the check connector. Measure voltage between terminals VF 1 and E 1 .Measure voltage between terminals VF 1 and El.Normal code, code Nos.
21, 25 and 26 Repair the relevant diagnostic code.
Disconnect the PCV hose.
Replace the oxygen sensor.Repair (Over rich)
Repair (Over lean) More than 0 V
± EFI SYSTEMElectronic Control System (Main Oxygen SensorFI±130

Sub±Oxygen Sensor (CALIF. only)
INSPECTION OF SUB±OXYGEN
SENSOR
INSPECT SUB±OXYGEN SENSOR
HINT: Inspect only when code No.27 is displayed.
(a) Diagnostic code cancellation.
(See page FI±24)
(b) Warm up the engine until it reaches normal operating
temperature.
(a) (M/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h in 4th or 5th gear.
(A/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h (62 mph) in ºDº range.
(d) Following the conditions in step (e), press fully on the
accelerator pedal for 2 seconds or more.
HINT: Do not exceed 100 km/h (62 mph), or diagnostic code
will be cancelled.
(e) Stop the vehicle and turn the ignition switch to OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
If code No. 27 reappears again, check the sub±oxygen sensor
circuit. If the circuit is normal, replace the suboxygen sen-
sor. 3. (2VZ±FE)
INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminal +B and HT.
Resistance (Cold): 5.1 6.3
at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
± EFI SYSTEMElectronic Control System (Main Oxygen SensorFI±131

Sub±Oxygen Sensor (CALIF. only)
INSPECTION OF SUB±OXYGEN
SENSOR
INSPECT SUB±OXYGEN SENSOR
HINT: Inspect only when code No.27 is displayed.
(a) Diagnostic code cancellation.
(See page FI±24)
(b) Warm up the engine until it reaches normal operating
temperature.
(a) (M/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h in 4th or 5th gear.
(A/T)
Drive for 5 minutes or more between 80 km/h (50
mph) and 100 km/h (62 mph) in ºDº range.
(d) Following the conditions in step (e), press fully on the
accelerator pedal for 2 seconds or more.
HINT: Do not exceed 100 km/h (62 mph), or diagnostic code
will be cancelled.
(e) Stop the vehicle and turn the ignition switch to OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
If code No. 27 reappears again, check the sub±oxygen sensor
circuit. If the circuit is normal, replace the suboxygen sen-
sor. 3. (2VZ±FE)
INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminal +B and HT.
Resistance (Cold): 5.1 6.3
at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
± EFI SYSTEM
Sub±Oxygen Sensor (CALIF. only)FI±131

Fuel Cut RPM
INSPECTION OF FUEL CUT RPM
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. INSPECT FUEL CUT RPM
(a) Disconnect the connector from the throttle position sensor.
(b) Connect terminals IDL and E1 (3S±FE (w/o ECT)) or E2
(others) of the wiring connector.
(e) Gradually raise the engine rpm and check that there is fluctua-
tion between the fuel cut and fuel return points.
HINT:
wThe vehicle should be stopped.
wMeasure with the A/C OFF.
Fuel cut rpm: 3S±FE 1,500 ± 2,100 rpm
2VZ±FE 1,800 rpm
Fuel return rpm: 3S±FE 1,000 rpm
2VZ±FE 1,200 rpm
± EFI SYSTEMElectronic Control System (Fuel Cut RPM)FI±137

Troubleshooting
If the HC/CO concentration does not comply with regula-
tions, perform troubleshooting in the order given below.
(a) Check oxygen sensor operation.
(See page FI±129)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
1. Faulty ignition:
wIncorrect timing
wFouled, shorted or improperly gapped plugs
wOpen or crossed high±tension cords
wCracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
1. Restricted air filter
2. Faulty EFI system
wFaulty pressure regulator
wClogged fuel return line
wDefective water temp. sensor
wDefective air temp. sensor
wFaulty ECU
wFaulty injector
wFaulty cold start injector
wFaulty throttle position sensor
wAir flow meter 1. Vacuum leak:
wPCV hose
wEGR valve
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
2. Lean mixture causing misfire
Rough idle
(Black smoke from exhaust)Rough idle
(Fluctuating HC reading) Rough idleProblem
Normal
Cause
High
High
HighHigh
Low
± ENGINE MECHANICALIdle and or 2 500 rpm HC CO Concentration CheckMethod
EM±21