Topaz FWD L4-140 2.3L HSO (VIN S) (1988)
Fuel Pump Relay: All Technical Service Bulletins
Fuel Pump Relay - Component Location Correction
FUEL SYSTEM - FUEL PUMP RELAY - ELECTRICAL VACUUM TROUBLESHOOTING MANUAL (EVTM) CORRECTION
Article No. 89-5A-10
FORD:
1988 TEMPO
LINCOLN-MERCURY: 1988 TOPAZ
ISSUE:
The component location given for the Fuel Pump Relay in the Component Location listing for the Electronic Engine Control Section, page
43 of the 1988 Tempo/Topaz EVTM is incorrect.
ACTION:
The location should read: Behind LH side of I/P, as shown on this TSB. This information should be inserted into your 1988 Tempo/Topaz
EVTM.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS:
"INFORMATION ONLY"
OASIS CODES:
2800
1988
ELECTRONIC ENGINE CONTROL 43
HOW THE CIRCUIT WORKS
The Electronic Engine Control (EEC) System includes an Electronic Control Assembly (ECA) that receives inputs from various sensors. The ECA uses
this information to control (1) Fuel Flow, (2) Exhaust Gas Recirculation (EGR), (3) Ignition and (4) Evaporative Emissions. These four systems and the
ECA work together to provide improved fuel economy and performance, and lower exhaust emissions.
EEC Power Relay
The EEC Power Relay supplies power to the ECA and ECA System related components. When the Ignition Switch is turned to RUN or START, voltage
is applied to the EEC Power Relay coil, and the relay's contacts close.
Fuse Link J applies voltage to the Fuel Pump Relay. It also applies voltage to the Fuel injectors, the ECA, and the EGR Solenoid through the EEC Power
Relay contacts.
Fuel Flow
The 2.3L engine is equipped with Electronic Fuel Injection (EFI), which injects fuel into the engine through the Fuel Injectors located above each intake
valve.
The duration and timing of the Fuel Injectors are controlled by the ECA. The ECA determines when to operate the Fuel Injectors according to the input
it receives from various sensors.
The Electric Fuel Pump supplies fuel under pressure to the Fuel Injectors. When the Ignition Switch is in RUN or START, voltage is applied to the Fuel
Pump Relay coil. The coil is grounded by the ECA and the relay contacts close. Voltage is now applied to the Electric Fuel Pump.
The Inertia Switch is a safety device which cuts off voltage to the Electric Fuel Pump in the event of a collision. Once the Inertia Switch opens it must be
reset manually.
Page-
COMPONENT LOCATION
Figure
Inertia Switch . . . . . . . . .
On LH hinge support, in luggage compartment. . . . . . . . . . . . .
48-3
Air Charge Temperature Sensor . .
RH side of engine, in intake manifold. . . . . . . . . . . . . . . .
49-1
Canister Purge Solenoid . . . . .
LH side of engine, top of transaxle. . . . . . . . . . . . . . . . .
45-1
Diode . . . . . . . . . . . . . .
Taped in fuel charge harness, in T/O to idle control solenoid.
*
EEC Power Relay . . . . . . . . .
Behind RH side of I/P. . . . . . . . . . . . . . . . . . . . . . . .
46-1
EGR Vacuum Regulator (EVR) . . .
Mounted on LH strut tower. . . . . . . . . . . . . . . . . . . . . .
48-1
EGR Valve Position Sensor . . . .
Center front of dash . . . . . . . . . . . . . . . . . . . . . . .
47-1
Electric Fuel Pump . . . . . . .
Top of fuel tank . . . . . . . . . . . . . . . . . . . . . . . . .
49-2
Electronic Control Assembly (ECA)