1986 TOYOTA CAMRY V20 condition

Check that there is voltage between ECU terminal IGT and body
ground. (idling) No voltage between ECU terminals IGT and El.
(idling)
Check wiring between ECU and
battery.Check wiring between ECU
terminal E1 and body ground.
Check fusible link and ignition
switch.
Check distributor. (See page±IG±7)
Check igniter. (See page IG±8)Repair or replace.Repair or replace.
Repair or replace.
Repair or replace. Try another ECU.Repair or
replace. STD voltage
No voltageCondition TerminalsTrouble
Idling
BAD
BADBADBADBAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±44

Check that there is voltage between ECU terminal +B or +B1 and
body ground. (IG SW ON) There is no voltage between ECU terminals ISC1 or ISC2 and
E1 (IG SW ON)
Check resistance between ISC valve
terminals +B and ISC1 or ISC2.
STD resistance: 16.0 ± 17.0

Check wiring between ECU and
ISC valve.Repair or replace
wiring. Refer to No. 1.
(See page FI±34)
Replace ISC valve.
Try another ECUSTD voltage
No voltage
IG SW ONCondition TerminalsTrouble
BAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±45

Check that there is voltage between ECU terminal W and
body ground.
Check wiring between ECU terminal El and body
ground. No voltage between ECU terminals W and E1.
(idling) No trouble (ºCHECKº engine warning light
off) and engine running
Check GAUGE fuse 7.5 A and ºCHECKº
engine warning light.
Check wiring between ECU
terminal W and fuse.Fuse blows again
BADRepair or replace.
Repair or replace. Repair or replace. Try another ECU.STD voltage
No voltageCondition
TerminalsTrouble
BAD
BAD No.
± EFI SYSTEMTroubleshooting with Volt/ OhmmeterFI±46

Check that there is voltage between ECU terminal A/C and body
ground.No voltage between ECU terminals A/C and El .
(Air conditioning ON)
Check wiring between ECU terminal El and body
ground.
Check wiring between amplifier and
ECU or compressor. Check that there is voltage between
amplifier terminal and body ground.Check wiring between
ECU
terminal A/C and
amplifier. Check compressor running.Air conditioning O N
Repair or replace. Repair or replace.Repair or replace.
Try another ECU.
Repair or replace. STD voltage
No voltage
Condition
TerminalsTrouble
BAD
BADBAD
BAD
No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±47

No trouble (ºCHECKº engine warning light off) and
engine running
Voltage at ECU Wiring Connectors
Coolant temp. 80°C (176°F) Measuring plate fully closed
Intake air temp. 20°C (68°F) Measuring plate fully open Throttle valve fully closed
Air conditioning ONThrottle valve open Throttle valve open
Cranking or idlingSTD voltage (V)
IG SW ON
1G SW ON
IG SW ONCondition
IG SW ONIG SW ON
IG SW ON TerminalsSee page
CrankingIdling
FI±63FI±62FI±58
FI±60 FI±59FI±57
FI±65FI±64FI±52
FI±61FI±55
rpm No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±51

Check that there is voltage between ECU terminal BATT and body
ground.
Check wiring between ECU terminal E1 and body ground.
Check wiring between ECU terminal and
battery.There is no voltage between ECU terminals BATT and El.
Check fuse and fusible link.Repair or replace.
Repair or replace. Try another ECU.
wBATT ± E1
STD voltage
No voltage
Terminals
IG SW ON
Condition
Replace. Trouble
BADBAD
BADNo.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±52

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 +B (+Bl)
and body ground. (IG SW ON) There is no voltage between ECU terminals VC or VS and E2.
(IG SW ON)
Check wiring between ECU terminal E 1 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±52) Measuring plate fully open
Replace air flow
meter.Repair or replace.
Repair or replace.
Try another ECU.STD voltage
No voltage
3,000 rpmIG SW ON TerminalsCondition
Trouble
Idling
¿ OK
BAD
BAD BAD No.
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±57