Visual Inspection

In order that the Electronic Fuel Injection System can function properly, all electrical, vacuum or air hose connections must be tight. Before proceeding with the diagnostic procedure, the following must be checked.

ELECTRICAL CONNECTIONS

Terminals in connectors must lock together. Look for connectors that are not fully plugged into each other or terminals that are not fully plugged into the insulator. Also make sure logic and [1][2]power module connector terminals are making good contact with their mating pins.

1. Underhood Connectors

a. [1][2]Power module

b. A/C cutout relay

c. Starter relay

d. Radiator fan relay

e. Distributor

f. Coolant sensor

g. Spark plug wires and coil wire

h. Fuel injector

i. Throttle body

j. System ground eyelet on intake manifold

k. Engine harness to main harness

l. Alternator

m. Battery cables

n. Battery ground on engine

o. Engine to firewall ground strap

p. EGR/Canister purge solenoid

q. Ignition coil

r. Oxygen sensor

s. Speed sensor

Behind Right Kick Pad Connectors

a. Logic module
b. Shutdown relay

c. Map sensor

Underbody Connections

a. Intake fuel pump

HOSE CONNECTIONS

All hoses must be fully and firmly fitted at their connections. Also, they cannot be pinched anywhere along their routing. Look for hoses that are not fully plugged in, or are pinched and cut.

PCV System

a. Hose between intake manifold and PCV valve.

b. Hose between breather module and air cleaner.

c. PCV valve plugged in.

d. Correct PCV valve. Black in color.

EGR System

a. Hose between throttle body and EGR solenoid.

b. Hose between EGR solenoid and back pressure valve.

c. Hose between back pressure valve and EGR valve.

d. Hose between back pressure valve and exhaust supply tube.

Evaporative Control System

a. Hose between canister purge solenoid and 3- way vacuum tee.

b. Hose between canister purge solenoid and canister.

c. Hose between canister and throttle body.

d. Hose between canister and vapor return line.

Heated Air Intake System

a. Hose between throttle body and 3-way vacuum tee.