Page 457 of 4770
Check for open in harness and connector between IG switch and
EFI main relay, EFI main relay and body ground (See page IN±31).
Remove EFI fuse from J/B No.2.
Check continuity of EFI fuse.
Continuity
Check for open in harness and connector
between EFI main relay and battery, EFI main
relay and engine control module.Check for short in all the harness and
components connected to EFI fuse (See
attached wiring diagram). Remove under cover and finish panel.
Check continuity between terminals.
Repair or replace harness or connector.
Check ignition switch.
Replace ignition switch.
Check EFI fuse.
Switch positioncontinuity
10
AM2 Terminal
4
AM1 3
ACC6
ST27
ST19
IG2
START2
lG1
LOCK
ACC
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±407
Page 458 of 4770
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is off
for use by the diagnostic trouble code memory and air±fuel ratio adaptive control value memory, etc.
Back Up Power Source Circuit
Proceed to next circuit inspection
shown on matrix chart (See page EG1±327).Check and repair harness or connector
between battery, EFI fuse and ECU. Check for short in all the harness and
components connected to EFI fuse.
DIAGNOSTIC CHART
Check operation for the back up. Check voltage of terminal6ATT.
WIRING DIAGRAM
Check and replace ECM. Check EFI fuse.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±408
Page 459 of 4770
Remove glove compartment.
(See page EG1±234)
Measure voltage between terminal BATT of en±
gine control module connector and body ground.
Voltage: 9 ±14 V
Check voltage between terminal BATT of engine control module
connector and body ground.
Are the diagnostic trouble codes still in the memory when the
ignition switch is turned OFF?
Check and repair harness or connector
between engine control module and EN
fuse, EFI fuse and battery. Remove EFI fuse from J/B No.2.
Check continuity of EFI fuse.
Continuity
Check for short in all the harness and
components connected to EFI fuse
(See attached wiring diagram).
Proceed to next circuit inspection shown on
matrix chart (See page EG1±327).Check and replace engine control module.
INSPECTION PROCEDURE
Check EFI fuse.
Others
YES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±409
Page 460 of 4770
Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
wWith the engine idling measure waveform between terminals #10, #20 (#1, #2, #3 and #4*)
and E01 of engine control module.
HINT: The correct waveform appears as shown in the illustration on the below.
CIRCUIT DESCRIPTION
The injectors are provided to the intake manifold. They inject fuel into the cylinders based on the
signals from the engine control module.
Check continuity between terminals E01, E02
and body ground. Check voltage of terminals #10 and #20
(#1. #2. #3 and #4*).
Check for open in harness and connector
between ECM and battery.Check for short in all the harness and
components connected to AM2 fuse.
*: Only for California specification vehicles.
Injector Circuit
Repair or replace harness or connector.
DIAGNOSTIC CHART
Check operation for injectors.
Check and replace ECM.Replace injector. Check AM2 fuse.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±410
Page 461 of 4770
WIRING DIAGRAM
Except California specification vehicles.
Only for California specification vehicles.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±411
Page 462 of 4770
(1) Remove glove compartment.
(See page EG1±234)
(2) Turn ignition switch ON.
Exc. California spec.
Measure voltage between terminals #10, #20 of
engine control module connector and body
ground.
Only for California spec,
Measure voltage between terminals #1, #2, #3
and #4 of engine control module connector and
body ground.
Voltage: 9 ±14 V
Check voltage between terminals #10, #20 (#1, #2, #3 and #4) of
engine control module connector and body ground.
INSPECTION PROCEDURE
Go to step
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±412
Page 463 of 4770
Check for open in harness and connector between terminals E01, E02
of engine control module connector± and body ground (See page IN±31).
Remove AM2 fuse from J/B No. 2.
Check continuity of AM2 fuse.
Continuity
Check for open in harness and connector
between engine control module and battery.Check for short in all the harness and
components connected to AM2 fuse.
Repair or replace harness or connector.
Check AM2 fuse.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±413
Page 464 of 4770
Check injection volume of injector
(See page EG1±195).
wInjection volume
49 ± 59 cm (3.0 ± 3.6 cu in.)/15 sec.
Difference between each injector:
Less than 5 cm3 (0.3 cu in.)
wLeakage
Fuel drop: One drop or less per minute. Disconnect injector connector
(See page EG1±189) .
Measure resistance of injector.
Check and replace engine control module.
Check injectors.
Replace injector. Resistance: Approx. 13.8
at 20C (68F)
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±414