1999 TOYOTA CAMRY fuel pump

± DIAGNOSTICSENGINE (5S±FE)
DI±69
304 Author: Date:
4 Check air induction system (See page SF±1).
NG Repair or replace.
OK
5 Check EGR system (See page EC±12).
NG Repair EGR system.
OK
6 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK
7 Check injector injection (See page SF±23).
NG Replace injector.
OK
Replace oxygen sensor
(bank 1 sensor 1).

± DIAGNOSTICSENGINE (5S±FE)
DI±73
308 Author: Date:
4 Check air induction system (See page SF±1).
NG Repair or replace.
OK
5 Check EGR system (See page EC±12).
NG Replace EGR system.
OK
6 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK
7 Check injector injection (See page SF±23).
NG Replace injector.
OK
Replace oxygen sensor
(bank 1 sensor 1).

± DIAGNOSTICSENGINE (5S±FE)
DI±81
316 Author: Date:
5 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter.
OK
6 Check gas leakage on exhaust system.
NG Repair or replace.
OK
Check and replace ECM (See page IN±31).

DI±86
± DIAGNOSTICSENGINE (5S±FE)
321 Author: Date:
5 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter.
OK
6 Check gas leakage on exhaust system.
NG Repair or replace.
OK
Check and replace ECM (See page IN±31).

± DIAGNOSTICSENGINE (5S±FE)
DI±95
330 Author: Date:
4 Check resistance of injector of misfiring cylinder (See page SF±20).
NG Replace injector.
OK
Check for open and short in harness and
connector between injector and ECM
(See page IN±31).
5 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, pressure regula-
tor, fuel pipe line and filter.
OK
6 Check injector injection (See page SF±23).
NG Replace injector.
OK
7 Check EGR system (See page EC±12).
NG Repair EGR system.
OK

± DIAGNOSTICSENGINE (5S±FE)
DI±155
390 Author: Date:
4 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF±1).
NG Repair or replace.
OK
6 Check EGR system (See page EC±12).
NG Repair EGR system.
OK
7 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK

± DIAGNOSTICSENGINE (5S±FE)
DI±159
394 Author: Date:
4 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF±1).
NG Repair or replace.
OK
6 Check EGR system (See page EC±12).
NG Repair EGR system.
OK
7 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK

A00325
BatteryMAIN IG Switch
AM2EFI
MAIN
FLStarter ST RelayPark/Neutral Position Switch
(Clutch Start Switch)EFI RelayCIR OPN Relay
Fuel Pump
ECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) IGN
STARTER ST
± DIAGNOSTICSENGINE (5S±FE)
DI±183
418 Author: Date:
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump 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.
DI01M±05