TOYOTA CAMRY V20 1986 Service Information

REMOVAL OF FUEL PUMP
CAUTION: Do not smoke or work near an open flame when
working the fuel pump.
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. REMOVE FUEL TANK
4. REMOVE FUEL PUMP FROM FUEL PUMP BRACKET
(a) Pull off the lower side of the fuel pump from the bracket.
(b) Remove the two nuts, and disconnect the wires from the fuel
pump.
(c) Disconnect the fuel hose from the fuel pump.3. REMOVE FUEL PUMP BRACKET FROM FUEL TANK
(a) Remove the bolt of the bracket.
(b) Remove the seven screws, pull out the pump bracket.
COMPONENTS (2WD)
± EFI SYSTEMFuel System (Fuel PumpFI±74

4. INSTALL FUEL TANK
When installing the fuel tank, refer to FI±65 for the installation
position of the cushion and the tightening torque.
5. CONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY 2. INSTALL FUEL PUMP TO FUEL PUMP BRACKET
(a) Connect the fuel hose to the outlet port of the fuel pump.
(b) Connect the wires to the fuel pump with the two nuts.
(e) Push the lower side of the fuel pump, and install the fuel
pump.
3. INSTALL FUEL PUMP BRACKET TO FUEL TANK
(a) Install a new gasket and the pump bracket with the seven
screws.
Torque: 40 kg±cm (35 in.±lb, 3.9 N±m)
(b) Install the bolt of the bracket.
INSTALLATION OF FUEL PUMP
(See page FI±74)
1. INSTALL FUEL PUMP FILTER TO FUEL PUMP
(a) Install the pump filter with a new clip.
(b) Install the rubber cushion.5. REMOVE FUEL PUMP FILTER FROM FUEL PUMP
(a) Remove the rubber cushion.
(b) Using a small screwdriver, remove the clip.
(c) Pull out the pump filter.
± EFI SYSTEMFuel System (Fuel Pump)_FI±75

REMOVAL OF FUEL PUMP
CAUTION: Do not smoke or work near an open flame when
working the fuel pump.
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. REMOVE FUEL TANK
4. REMOVE FUEL PUMP±FROM FUEL PUMP BRACKET
(a) Pull off the lower side of the fuel pump from the bracket.
(b) Remove the two nuts, and disconnect the wires from the fuel
pump.
(c) Disconnect the fuel hose from the fuel pump. 3. REMOVE FUEL PUMP BRACKET FROM FUEL TANK
Remove the seven bolts, pull out the pump bracket.
COMPONENTS (4WD)
± EFI SYSTEMFuel System (Fuel Pump)FI±76

2. INSTALL FUEL PUMP TO FUEL PUMP BRACKET
(a) Connect the fuel hose to the outlet port of the fuel pump.
(b) Connect the wires to the fuel pump with the two nuts.
(c) Push the lower side of the fuel pump, and install the fuel
pump.
4. INSTALL FUEL TANK
When installing the fuel tank, refer to FI±65 for the installation
position of the cushion and the tightening torque.
5. CONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY INSTALLATION OF FUEL PUMP
(See page FI±76)
1. INSTALL FUEL PUMP FILTER TO FUEL PUMP
(a) Install the pump filter with a new clip.
(b) Install the rubber cushion.
3. INSTALL FUEL PUMP BRACKET TO FUEL TANK
Install a new gasket and the pump bracket with the seven
bolts.
Torque: 30 kg±cm (26 in.±lb, 2.9 N±m)
5. REMOVE FUEL PUMP FILTER FROM FUEL PUMP
(a) Remove the rubber cushion.
(b) Using a small screwdriver, remove the clip.
(e) Pull out the pump filter.
± EFI SYSTEMFuel System (Fuel Pump)FI±77

HINT:
wThe following troubleshooting procedures are designed for inspection of each separate system, and
therefore
the actual procedure may vary somewhat. However, troubleshooting should be performed while referring
to the inspection methods described in this manual.
wBefore beginning inspection, it is best to first make a simple check of the fuses, fusible links and the condi-
tion of the connectors.
wThe following troubleshooting procedures are based on the supposition that the trouble lies in either a
short or open circuit within the computer.
wIf engine trouble occurs even though proper operating voltage is detected in the computer connector,
then it can be assumed that the ECU is faulty and should be replaced. .
TROUBLESHOOTING WITH
VOLT OHMMETER
LOCATION OF FUSES AND FUSIBLE LINKS
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±31

EFI SYSTEM CHECK PROCEDURE
(3S±FE)
HINT:
wPerform all voltage measurements with the connectors con-
nected.
wVerify that the battery voltage is 11 V or more when the igni-
tion switch is in ºONº position.
Using a voltmeter with high impedance (10 kW/V minimum),
measure the voltage at each terminal of the wiring
connectors.
THROTTLE POSITION
SENSORTHROTTLE POSITION
SENSOR
THROTTLE POSITION
SENSOR
Terminals of ECU
NEUTRAL START
SWITCH
HEADLIGHT and
DEFOGGER EGR GAS TEMP.
SENSOR
WATER TEMP. SENSOR SUB±OXYGEN SENSORA/C MAGNET SWITCH
STOP LIGHT SWITCH
CHECK CONNECTORCHECK CONNECTORAIR FLOW METER
AIR FLOW METER
AIR FLOW METER STARTER SWITCH
SENSOR GROUND SENSOR GROUND ENGINE GROUND
ENGINE GROUND ENGINE GROUND
OXYGEN SENSOR
WARNING LIGHTA/C AMPLIFIER
SPEED SENSORTerminal name Terminal name Terminal name
DISTRIBUTORDISTRIBUTOR
DISTRIBUTOR
MAIN RELAYMAIN RELAY ISC VALVE
ISC VALVE INJECTORINJECTOR Symbol
BATTERY Symbol
Symbol
IGNITERECT ECUECT ECU
ECT ECU
IGNITER
ECT ECU
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±32

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

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

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

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