sensor TOYOTA CAMRY V20 1986 Service Information

Check that there is voltage between ECU terminal +B or +131
and body ground. (IG SW ON)
No voltage between ECU terminals THG and
E2. (IG SW ON)
Check wiring between ECU terminal E1 and body ground.
Check EGR gas temp. sensor.
(See page FI±126)
Check wiring between ECU and
EGR gas temp. sensor.Refer to No. 1.
*(See page FI±34)
Replace EGR gas
temp. sensor.Check EGR system.Repair or replace.
Repair or replace.Repair or replace.
Try another ECU.BAD
BAD
BAD
BAD
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±49

EFI SYSTEM CHECK PROCEDURE
(2VZ±FE)
PREPARATION
(a) Disconnect the connectors from the ECU.
(b) Remove the locks as shown in the illustration so that the
tester probe(s) can easily come in.
NOTICE: Pay attention to sections ºAº and ºBº in the il-
lustration which can be easily broken.
(e) Reconnect the connectors to the ECU.
HINT:
wPerform all voltage measurements with the connectors con-
nected.
wVerify that the battery voltage is 11 V or more when the igni-
tion switch is in ºONº position.
Using a voltmeter with high impedance (10 k

/V mini±
mum), measure the voltage at each terminal of the wiring
connectors.
AIR FLOW METER
THROTTLE POSITION SENSOR
Terminals of ECU
No. 1 SPEED SENSOR (Meter side)
No. 2 SPEED SENSOR (AlT side)
THROTTLE POSITION SENSOR FUEL PRESSURE CONTROL VSV
THROTTLE POSITION SENSORCRUISE CONTROL COMPUTER
* 1 w/ ECT
*2 CALIF. only KNOCK CONTROL SENSOR PATTERN SELECT SWITCH
OXYGEN SENSOR HEATER
NEUTRAL START SWITCHEGR GAS TEMP. SENSOR INJECTOR (No. 2 and 3)INJECTOR (No. 4 and 5)
SIFT POSITION SWITCH.
ISC MOTOR NO. 3 COILINJECTOR (No. 1 and 6i
ISC MOTOR NO. 1 COIL
ISC MOTOR NO. 4 COILSIFT POSITION SWITCH ISC MOTOR NO. 2 COILWATER TEMP. SENSORSUB±OXYGEN SENSOR
SIFT POSITION SWITCH COLD START INJECTOR
EFI MAIN RELAY (COIL)
SIFT POSITION SWITCHSUB±OXYGEN SENSOR CHECK CONNECTOR
COMPUTER GROUND
CHECK CONNECTORCHECK CONNECTOR CHECK CONNECTOR
AIR TEMP. SENSORA/C COMPRESSOR
SENSOR GROUNDTerminal Name
OXYGEN SENSOROD MAIN SWITCH
STARTER SWITCHIGNITION SWITCH Terminal Name
AIR FLOW METERTerminal Name
POWER GROUND
POWER GROUND
WARNING LIGHT
EFI MAIN RELAY BRAKE SWITCH
EFt MAIN RELAY ECT SOLENOID
ECT SOLENOIDA/C AMPLIFIER
ECT SOLENOIDDISTRIBUTOR
DISTRIBUTOR DISTRIBUTOR
DISTRIBUTOR
TEMS ECU
TEMS ECU
TEMS ECU Symbol Symbol Symbol
BATTERY IGNITER
IGNITER
*2NSW
*1OD2
No. 30 No. 10
No. 20
*1PWR
*2OX2
M±REL
*1OD 1
*2CHK
*2THGIG SW
*1SP2
BATT
*1SL
*1 DG
1S1THW
*1S2
*1BK
ISC4 1SC2 ISC1
ISC3VTAOX1
ACTS TJSP1
THA
STAKNK EO2 E01
IGT
*1R A/C
EPU
1
L
IGF
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±50

Check that there is voltage between ECU terminal +B (+B1)
and body ground. (IG SW ON)There is no voltage between ECU terminals IDL and E2. (IG SW
ON) (Throttle valve open)
Check wiring between ECU terminal E 1 and body
ground.
Check wiring between ECU and
throttle position sensor. Check throttle position sensor.
(See page FI±112)
Repair or replace throttle
position sensor.Throttle valve fully closed
Refer to No. 1.
(See page FI±51) Throttle valve fully openThrottle valve open
Repair or replace.
Repair or replace.
Try another ECU. Try another ECU.
wIDL ± E2
STD voltage
No voltage
IG SW ON Terminals
Condition Trouble
BAD
BADBAD
BAD
No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±55

Check that there is voltage between ECU terminal VC and E2.
(IG SW ON) Check that there is voltage between ECU terminal +B (+B1)
and body ground. (IG SW ON)
There is no specified voltage at ECU terminals VTA and E2.
(1O SW ON) There is no voltage between ECU terminals VC and E2.
(IG SW ON)
Check wiring between ECU and throttle
position sensor.
Check wiring between ECU and
throttle position sensor.Check throttle position sensor.
(See page FI±112)
Check throttle position sensor.
(See page FI±112) Refer to VC ± E2 trouble
section.Repair or replace
wiring. Refer to No. 1.
(See page FI±51 )
Repair or replace.
Repair or replace.
Repair or replace.
Try another ECU. Try another ECU.
wVTA ± E2 wVC ± E2
BAD
BAD BAD
BAD
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±56

Check that there is voltage between ECU terminal +B (+B1 )
and body ground. (IG SW ON)There is no voltage between ECU terminals THA and E2.
(IG SW ON)
Check wiring between ECU terminal E1 and body ground.
Check wiring between ECU and air temp.
sensor. Intake air temperature 20°C (68°F)
Check air temp. sensor.
(See page FI±104)Refer to No. 1.
(See page FI±52)
Replace air flow
meter.Repair or replace.
Repair or replace.
Try another ECU.STD voltage
No voltage
IG SW ON
TerminalsCondition Trouble
BADBAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±59

Check that there is voltage between ECU terminal +B (+B1)
and body ground. (IG SW ON) There is no voltage between ECU terminals THW and E2.
(IG SW ON)
Check wiring between ECU and water temp.
sensor. Check wiring between ECU terminal E1 and body ground.
Check water temp. sensor.
(See page FI±125) Coolant temperature 80°C
(176°F)
Refer to No. 1.
(See page FI±52)
Replace water
temp. sensor.
Repair or replace.Repair or replace.
Try another ECU.STD voltage
No voltageIG SW ON Terminals
Condition
Trouble
BADBAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±60

Check that there is specified voltage between ECU terminals VF
and body ground. ¿ There is no voltage between ECU terminals VF and E 1.
Check wiring between ECU terminal E i and body ground.
Check for suction of air into exhaust system.
Check wiring between oxygen sensors and
ECU connectors. ¿¿ Check operation of oxygen sensors.Check for air leak from air intake system.
Check cold start injector.Check distributor and ignition system.
Replace oxygen sensors.* Rich malfunction only Check fuel pressure.
Check air flow meter.Check spark plugs.Repair air suction.
Repair or replace. Repair or replace_Repair or replace.
Repair or replace.
Repair or replace.Repair or replace.
Repair or replace. Try another ECU.
Check injectors.
System normal.Repair air leak.
Repair wiring. BAD
BAD
BADBADBAD BAD
BAD
BAD
BAD BADBAD
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±66

Check that there is voltage between ECU terminal +B
(+B1) and body ground. (IG SW ON)No voltage between ECU terminal THG and E2.
(IG SW ON)
Check wiring between ECU terminal E1 and body ground.
Check wiring between ECU and
EGR gas temp. sensor. Check EGR gas temp. sensor.
(See page FI±126)
Replace EGR gas
temp. sensor.Refer to No. 1.
(See page FI±32)
Check EGR system.Repair or replace.
Repair or replace.
Repair or replace.
Try another ECU.
BAD
BAD
BAD BAD
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±67

REMOVAL OF INJECTORS
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. DRAIN ENGINE COOLANT (See page CO±5)
3. (A/T)
DISCONNECT THROTTLE CABLE FROM THROTTLE
BODY AND BRACKET
4. DISCONNECT ACCELERATOR CABLE AND BRACKET
FROM THROTTLE BODY AND AIR INTAKE CHAMBER
5. REMOVE AIR CLEANER CAP, AIR FLOW METER AND
AIR CLEANER HOSE
(a) Disconnect the. air flow meter connector.
(b) Disconnect the air hoses.
(e) Loosen the air cleaner hose clamp bolt.
(d) Disconnect the air cleaner cap clips.
(e) Remove the air cleaner cap and air flow meter
together with the air cleaner hose.
6. DISCONNECT HOSES AND CONNECTORS
(a) PCV hoses
(b) Vacuum sensing hose
(e) Water by±pass hoses
(d) Fuel pressure control VSV hose
(e) Emission control vacuum hoses
(f) ISC connector
(g) Throttle position sensor connector
(h) (CALIF. only)
EGR gas temp. sensor connector
7. REMOVE NO. 1 RH ENGINE MOUNTING STAY
Remove the three bolts and mounting stay.
8. DISCONNECT COLD START INJECTOR CONNECTOR
9. DISCONNECT COLD START INJECTOR TUBE
(See step 3 on page FI±81 )
± EFI SYSTEMFuel System (Injectors (2VZ±FE))FI±94

10. DISCONNECT HOSES AND PARTS
(a) Brake booster vacuum hose
(b) PS vacuum and air hoses
(c) Cruise control vacuum hose
(d) Ground strap connector
(e) Wire harness clamp
Remove the nut, and disconnect the wire harness clamp.
(f) Fuel pressure control VSV hose.
11. DISCONNECT WIRE HARNESS CLAMP
Remove the nut and disconnect the wire harness.
12. DISCONNECT EGR PIPE
13. REMOVE NO.1 ENGINE HANGER AND AIR INTAKE
CHAMBER STAY
(a) Remove the two bolts and No.1 engine hanger.
(b) Remove the bolt, and disconnect the air intake chamber
stay from air intake chamber.
14. REMOVE AIR INTAKE CHAMBER
Remove the two bolts, nuts, air intake chamber and gasket.
15. DISCONNECT CONNECTORS
(a) Cold start injector connector
(b) Water temperature sensor connector
(c) Six injector connectors
16. DISCONNECT WIRE HARNESS CLAMPS FROM LH
DELIVERY PIPE
Disconnect the three wire harness clamp.
17. DISCONNECT FUEL INLET AND TWO RETURN
HOSES
(a) Disconnect the fuel return hoses from the fuel pressure reg-
ulator and No.1 fuel pipe.
(b) Disconnect the fuel inlet hose from the fuel filter.
18. REMOVE NO.2 FUEL PIPE
Remove the two union bolts, four gaskets and No.2 fuel
pipe.
± EFI SYSTEMFuel System (Injectors (2VZ±FE))FI±95