2000 TOYOTA CAMRY ignition

(1) Remove glove compartment.
(See page EG1±234)
(2) Turn ignition switch ON.
Measure voltage between terminals + B, + 131
and E1 of engine control module connector.
Voltage: 9 ±14 V
Check for open in harness and connector between terminal E1 of
engine control module and body ground (See page IN±31). Check voltage between terminals + B, + 131 and E1 of engine control
module connector.
Proceed to next circuit inspection shown on
matrix chart (See page EG1±327).
Repair or replace harness or connector.
INSPECTION PROCEDURE
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±405

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

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

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

(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

(1) Remove glove compartment
(See page EG1±234),
(2) Disconnect the engine control module con±
nectors.
(3) Turn ignition switch ON.
Measure voltage between terminals ISCO, ISCC
of engine control module connector and body
ground.
Check voltage between terminals ISCO, ISCC of engine control
module connector and body ground.
Check and replace engine control module.
INSPECTION PROCEDURE
Voltage: 9 ±14 V
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±417

CIRCUIT DESCRIPTION
Fuel pump control
The fuel pump is switched on (low voltage at terminal FC) when STA is on or while the NE signal
is input to the ECM.
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition
switch to the starter relay coil, the starter relay switches on and current flows to coil L1 of the circuit
opening relay. Thus the circuit opening relay switches on, power is supplied to the fuel pump and the
fuel pump operates.
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil L2
of the circuit opening relay, the relay switches on and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON)
and the fuel pump also keeps operating.
Fuel System Circuit
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±419

(1) Remove glove compartment.
(See page EG1±234).
(2) Turn ignition switch ON.
Measure voltage between terminal FC of engine
control module connector and body ground.
Check voltage between terminals FC of engine control module
connector and body ground.
Check for ECM power source circuit (See page EG1±403).
Check and replace engine control module.
INSPECTION PROCEDURE
Repair or replace. Voltage: 9 ±14 V
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±422