air condition TOYOTA CAMRY V20 1986 Service Information

1. Wiring connection
2. Power to ECU
(1) Fusible link(s)
(2) Fuse(s)
(3) ER main relay (See page FI±121)
3. Air flow meter (See page FI±104)
4. Water temp. sensor (See page FI±125)
5. Air temp. sensor (See page FI±104)
6. Injection signal circuit
(1) Injector wiring
(2) ECU (See page FI±130)CHECK EFI ELECTRONIC CIRCUIT USING
VOLT/OHMMETER
(See page FI±31)
1. Fuel pump (See page FI±68)
2. Fuel filter
3. Fuel pressure regulator
(See page FI±84 or 86) 1. Wiring connection(s) .
2. ISC valve (See page FI±116 or 118)
3. Air conditioner switch
CHECK DIAGNOSIS SYSTEM
Check for output of diagnosis code.
(See page FI±22)
CHECK THROTTLE POSITION SENSOR
(See page FI±105, 110 or 112) CHECK THROTTLE OPENER SYSTEM
(3S±FE only)
CHECK AIR CONDITIONER IDLE±UP
CIRCUIT
CHECK COLD START INJECTOR
(See page FI±78 or 81) CHECK FUEL PRESSURE
(See page FI±74)Diagnostic code(s) (See page FI±25 or 27)
Injector(s) Leakage, Injection quantityAir valve for air conditioner ± Leakage
CHECK INJECTORS
(See page FI±88 or 93) CHECK ACCELERATOR LINKAGE
CHECK ISC SYSTEMMalfunction
code(s)
Cold start injectorLinkage ± Stuck
Throttle opener
Throttle body
Normal code
BADBAD
BAD
BADBADBADBAD
BADBAD
± EFI SYSTEMTroubleshootingFI±17

(CALIF.)
wWhen air±fuel ratio feed±
back correction value or adap-
tive control value continues at
the upper (lean)
or lower (rich) limit for a certain
period of time or adaptive con-
trol value is not renewed for a
certain period of time.
wWhen feedback frequency of
air±fuel ratio feed±
back correction or adaptive
control is abnormally
high during feedback condition.
(Others)
wOxygen sensor outputs a lean
signal continuously for several
seconds during air±fuel ratio
feedback correction.
wOpen circuit in oxygen sensor
signal (OX).wWater temp. sensor
wInjector circuit
wInjector
wFuel line pressure
wAir flow meter
wAir intake system
wOxygen sensor circuits
wOxygen sensors
wIgnition system
wECU During air±fuel ratio feedback
correction, voltage output from the
main oxygen sensor does exceed a
set value on the lean side and the
rich side continuously for a certain
period.
Water temp. sensor
wInjector circuit
wInjector
wFuel line pressure
wAir flow meter
wCold start injector
wECU wMain oxygen heater circuit
wMain oxygen sensor heater
wECU wIgniter and ignition coil circuit
wIgniter and ignition coil
wECU
wIntake air temp. sensor circuit
wIntake air temp. sensor
wECU Open or short circuit in main oxygen
sensor heater signal
(HT).No NE signal to ECU when the en-
gine speed is above 1,000
rpm.wDistributor circuit
wDistributor
wStarter signal circuit
wECU
wMain oxygen sensor circuit
wMain oxygen sensor
wECU No NE or G signal to ECU
within 2 seconds after engine has
been cranked.
wWater temp. sensor circuit
wWater temp. sensor
wECU
DIAGNOSTIC CODES (2VZ±FE)
Open or short circuit in water temp.
sensor signal (THA).
Open or short circuit in intake air
temp. sensor signal (THA) This appears when none of the oth-
er codes are identified.
wDistributor circuit
wDistributor
wECU
No IGF signal to ECU FI±8
times in succession.
Intake air
Temp. Sensor
Signal
Air±fuel Ratio
Lean
Malfunction Number of
Check engine
blinks
Air±fuel Ratio
Rich
MalfunctionMain oxygen
Sensor Heater
SignalECT control program faulty.
Main oxygen
Sensor Signal
Water temp.
Sensor SignalECT Control
Signal
*CALIF. only Ignition
SignalTrouble area
RPM Signal
RPM SignalDiagnosisSee
page Code
No.System
Normal
wECU
FI±60FI±66
FI±59FI±62IG±4
± EFI SYSTEMDiagnosis SystemFI±27

wA/C switch circuit
wA/C switch
wA/C amplifier
wThrottle position sensor circuit
wThrottle position sensor
wNeutral position sensor
wNeutral start switch circuit
wNeutral start switch
wAccelerator pedal and cable
wECU wEGR valve
wEGR hose
wEGR gas temp. sensor cir-
cuit
wEGR gas temp. sensor
wBVSV for EG R
wBVSV circuit for EGR
wECU No SPI signal for 8 seconds when
engine speed in between 2,500 rpm
and 4,500 rpm and coolant temp.
is below 80°V 07609 except when
racing the engine.wNo. 1 vehicle speed sensor
(Meter side) circuit
wNo. 1 vehicle speed sensor
(Meter side)
wECU
A/C signal, or no IDL signal or no
NSW signal to ECU, with the check
terminals TE1 and
E1 shorted. Open circuit in VC signal or short
circuit between VS and
E2 when idle contacts are closed.
wThrottle position sensor cir-
cuit
wThrottle position sensor
wECU
DIAGNOSTIC CODES (2VZ±FE) (Cont'd)
Open or short circuit in throttle posi-
tion sensor signal
(VTA).
No STA signal to ECU until engine
speed reaches 800
rpm with vehicle not moving.
EGR gas temp. below predeter-
mined level during
EGR operation.wSub±oxygen sensor circuit
wSub±oxygen sensor
wECU Open or short circuit in sub±oxy-
gen sensor signal (OX2)
wIgnition switch circuit
wIgnition switch
wECU wAir flow meter circuit
wAir flow meter
wECU wAir flow meter circuit
wAir flow meter
wECU
Open or short circuit in knock sen-
sor signal (KNK).wKnock sensor circuit
wKnock sensor
wECU Open circuit i n E2 or short circuit
between VC and VS.
Knock control program faulty. Throttle
Position
Sensor Signal Number of
Check engine
blinks
Knock Sensor
Signal
Switch
Condition
SignalKnock Control
Signal Air Flow
Meter Signal
Vehicle Speed
Sensor Signal Air flow
Meter SignalSub±oxygen
Sensor Signal
EG R System
MalfunctionStarter Signal
*CALIF. only Trouble area
DiagnosisSee
page System Code
No.
wECUFI±55FI±57
FI±57
FI±67 FI±61
± EFI SYSTEMDiagnosis SystemFI±28

No trouble (ºCHECKº engine warning light off) and
engine running
Voltage at ECU Wiring Connectors (3S±FE)
Measuring plate fully closed
Intake air temp. 20°C (68°F)
Coolant temp. 80°C (1765F) Measuring plate fully open Throttle valve fully closed Throttle valve fully closed
Throttle valve open
Air conditioning ONThrottle valve open Throttle valve open
Cranking or idlingSTD voltage (V)
Terminals
3,000 rpmSee page Condition
IG SW ONIG SW ON
IG SW ON
IG
SW ONIG SW ON
IG SW ONCrankingIdling
FI±40
FI±44
FI±46FI±45FI±34
FI±43 FI±42
FI±47FI±35
FI±36
FI±37
FI±39
FI±41 No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±33

Check that there is voltage between ECU terminal +B or +B1 and
body ground. (IG SW ON) No voltage between ECU terminals +B or +B1 and El.
(IG SW ON)
Check wiring between ECU terminal E1 and body
ground.
Check wiring between ER main
relay and battery.Check fuse, fusible link and
ignition switch.
Check ER main relay.Try another ECU.
Repair or replace. Repair or replace.
Repair or replace.
Ignition SW ON
STD voltageTerminals
Condition
Replace.
Trouble
BAD BADBAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±34

Check that there is voltage between ECU terminal BATT and
body ground.
Check wiring between ECU terminal El and body
ground. No voltage between ECU terminals BATT and E1.
Check wiring between ECU
terminal and battery.Check fuse and fusible link.
Repair or replace.Repair or replace.
Try another ECU.STD voltage
No voltageCondition
Terminals
Replace. Trouble
BAD
BADBAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±35

Check that there is voltage between ECU terminal + B or + B1 and body
ground. (IG SW ON) No voltage between ECU terminal 1D1. or PSW and E1.
(IG SW ON)
Check wiring between ECU terminal El and body
ground.
Check wiring between ECU and
throttle position sensor. Check throttle position sensor.
(See page FI±106)
Replace or repair throttle
position sensor. Refer to No. 1.
(See page FI±34) Throttle valve fully closedThrottle valve open
Repair or replace.
Repair or replace.
Try another ECU.STD voltage
No voltageIG SW ONCondition
TerminalsTrouble
BAD
BAD
BAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±36

Check that there is voltage between ECU terminal +B or +B1 and body
ground. (IG SW 4111)
Check wiring between ECU terminal El and body
ground. No voltage between ECU terminals IDL and E2.
OG SW ON) (Throttle valve open)
Check wiring between ECU and
throttle position sensor. Check throttle position sensor.
(See page FI±110)
Repair or replace throttle
position sensor.Refer to No. 1.
(See page FI±34) Throttle valve fully closed
Throttle valve fully open
Try another ECU. Throttle valve open
Repair or replace.Repair or replace.
wIDL ± E2
STD voltage
No voltage
IG SW ON
Condition Terminals Trouble
BAD
BAD
BAD
BAD
No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±37

Check that there is voltage between ECU terminal +B or +B1 and body
ground. (IG SW ON)No specified voltage at ECU terminals VC or VS and E2.
(IG SW ON)
Check wiring between ECU terminal E1 and body
ground.
Check wiring between ECU and air flow
meter. Check air flow meter.
(See page FI±104) Measuring plate fully closed
Refer to No. 1.
±(See page FI±34) Measuring plate fully open
Replace air flow
meter.
Repair or replace.Repair or replace.
Try another ECU.STD voltage
BAD 3,000 rpm N o voltageIG SW ON
TerminalsCondition
Trouble
Idling
BAD
BAD
No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±39

No voltage between ECU terminals No. 10 and/or No. 20 and
E01 and/or E02. (IG SW ON)
Check that there is voltage between ECU terminal No. 10
and/or No. 20 and body ground.
Check resistance of magnetic coil in each injector.
STD resistance: Approx. 13.8 11Check wiring between ECU terminal E01 and/or
E02 and body ground.
Check wiring between ECU
terminal No. 10 and/or No. 20
and battery.Check fuse, fusible link and
ignition switch.
Repair or replace. Repair or replace.
Repair or replace. Try another ECU.
Replace injector. STD voltage
No voltage
IG SW ONCondition
TerminalsTrouble
BAD BAD
BADBAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±40