Page 1057 of 2389
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
Page 1058 of 2389
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
Page 1059 of 2389
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
Page 1060 of 2389
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
Page 1061 of 2389
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
Page 1062 of 2389
Check that there is voltage between ECU terminal +B or +131 and
body ground. (IG SW ON)
Check that there is voltage between ECU terminal VC and E2
(IG SW ON)No specified voltage at ECU terminals VTA and E2.
(IG SW ON) 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±110) Check throttle position sensor.
(See page FI±110)
Repair or replace
wiring.
Refer to NO±1.
(See page FI±34)
Refer to VC±E2
trouble section
Repair or replace.
Repair or replace. Repair or replace.
Try another ECU.
Try another ECU.
wNTA ± E2 wVC±E2
BAD
BAD
BAD
BAD
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±38
Page 1063 of 2389
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
Page 1064 of 2389
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