Ford Festiva. Instruction — part 42

Fig. 1: Testing Canister Purge Solenoid

Courtesy of FORD MOTOR CO.

Carbon Canister

1. Start and run engine until it is at operating temperature. Stop engine. Remove carbon canister. Carbon canister on 1.3L is located under

brake booster. Carbon canister is located in right side of engine compartment near cowl panel on 1.6L.

2. Inspect carbon canister for presence of liquid fuel, as evidenced by odor or weight. Blow into air vent and ensure air exits from fuel

vapor inlet. Replace carbon canister if it contains fuel, or if air does not pass freely through it.

POSITIVE CRANKCASE VENTILATION (PCV)

1. Remove PCV valve from valve cover and disconnect it from PCV hose. Shake valve vigorously to ensure plunger is free to move.

Replace PCV valve if plunger is not free.

2. Idle engine until it is warm. Remove fresh air hose at inlet end. Plug nipple immediately to prevent stalling. Verify presence of vacuum at

inlet end of hose. If vacuum is not present, replace PCV valve or service hoses or loose oil dipstick.

THROTTLE CONTROLS

Dashpot

Disconnect PCV valve. Remove resonance chamber. Push dashpot rod in and then release it. Replace dashpot if rod does not go in slowly and
return quickly.

MISCELLANEOUS CONTROLS

A/C CLUTCH

A/C Clutch Relay

Remove relay from its socket near left headlight, in front of battery. Connect ohmmeter to contact terminals (Blue/Red and Black/White wires
on mating connector). Ohmmeter should indicate continuity. Supply 12 volts to remaining terminals (Green/Yellow and Yellow wires on
mating connector). Ohmmeter should indicate no continuity.

COOLING FAN

Cooling Fan

Unplug connector from cooling fan. Apply 12 volts to one terminal of fan connector. Ground remaining fan connector terminal. Replace fan if
it does not run.

Cooling Fan Control Relay

Remove relay from its socket near left headlight. Connect ohmmeter to contact terminals. Wire colors are Yellow/Red and Black on mating
connector on Festiva; Yellow/Green and Black on Capri. Ohmmeter should indicate continuity. Supply 12 volts to remaining 2 relay
terminals. Ohmmeter should indicate no continuity.

NOTE:

Although some of the controlled devices listed here are not technically engine performance
components, they can affect driveability if they malfunction.

Copyright 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.

Article GUID: A00022700

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G - TESTS W/CODES

1991-92 ENGINE PERFORMANCE Ford Motor Co. Self-Diagnostics

INTRODUCTION

If no faults were found while performing BASIC TESTING , proceed with self-diagnostics. If no fault codes or only pass codes are present
after entering self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom
(i.e., ROUGH IDLE, NO START, etc.).

This article uses many abbreviations for devices, signal names, and wire colors. See

SELF-DIAGNOSTICS ABBREVIATIONS

table.

Abbreviations for wire colors used in individual PINPOINT TEST diagrams are as follows:



BLK - Black



BLU - Blue



BRN - Brown



GRN - Green



LT GRN - Light Green



ORG - Orange



PNK - Pink



RED - Red



WHT - White



YEL - Yellow

SELF-DIAGNOSTICS ABBREVIATIONS

SELF-DIAGNOSTIC SYSTEM

Hard Failures

Hard failures cause CHECK ENGINE light (MIL) to come on and remain on until problem is repaired. If MIL comes on and remains on (light
may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, ECA will use a
substitute value in its calculations to permit continued engine operation. In this condition (limp-in mode), vehicle will run but driveability will
not be optimum.

Intermittent Failures

Intermittent failures may cause MIL to flicker or come on and go off after intermittent defect goes away. Corresponding trouble code, however,
will be retained in ECA memory. If related defect does not reoccur within a certain time frame, related trouble code will be erased from ECA

Application

Abbreviation

Analog Volt/Ohmmeter

VOM

Barometric Pressure Sensor

BP

Breakout Box

BOB

Canister Purge Control Solenoid

CANP

CHECK ENGINE Light

MIL

Crankshaft Position Sensor

CPS

Cylinder Identification Sensor

CID

Electronic Control Assembly

ECA

Electronic Engine Control

EEC

Engine Coolant Temperature Sensor

ECT

Exhaust Gas Oxygen Sensor

EGO

Idle Speed Control

ISC

Ignition Diagnostic Monitor

IDM

Keep Alive Power

KAPWR

Key On Engine Off

KOEO

Key On Engine Running

KOER

Knock Control

KC

Power & Ground Connections

PGC

Fuel Pressure Regulator Control Solenoid

PRC

Reference Voltage & Signal Return

VREF

Self-Test Input

STI

Self-Test Output

STO

Signal Return

SIGRTN

Solenoid Controlled By Ground

SCG

Switch Monitor Lamp

SML

Switch To Ground

STG

Switch To Power

STP

Throttle Position Sensor

TP

Vane Airflow Meter

VAF

Vane Air Temperature Sensor

VAT

Vehicle Power

VPWR

Vehicle Speed Sensor

VSS

memory. Intermittent failures may be caused by a sensor, connector, or wiring. See INTERMITTENTS in TESTS W/O CODES article in the
ENGINE PERFORMANCE Section.

VISUAL CHECK & VEHICLE PREPARATION

Before connecting any equipment to diagnose EEC system, perform following preparatory procedures:



Verify condition of air cleaner and air ducts.



Check all vacuum hoses for leaks, restrictions, or improper routing.



Check EEC system wiring harness electrical connections for corrosion, bent or broken pins, loose wires or terminals, or improper
routing.



Check ECA, sensors, and actuators for physical damage.



Check engine oil and coolant level.



Perform all necessary safety precautions to prevent personal injury or vehicle damage.



Set parking brake. Place shift lever in Park for automatic transmissions, or Neutral for instruction transmissions. DO NOT move shift lever
during test unless specifically directed.



Turn off all lights and accessories. Ensure vehicle doors are closed when measuring voltage or resistance.



Start engine. Run at idle until upper radiator hose is hot and pressurized and engine is off fast idle. Check for leaks around exhaust
manifold, exhaust gas oxygen sensor, and vacuum hose connections.



Turn ignition off. Service items as required. Go to

EQUIPMENT HOOK-UP

.

EQUIPMENT HOOK-UP

VOM

1. Turn ignition off. Connect a jumper wire from STI connector to ground. Refer to

SELF-TEST CONNECTOR LOCATION

and

SELF-TEST CONNECTOR WIRE COLORS

tables. See

Fig. 1

.

2. Connect VOM between STO terminal and engine ground. Set VOM to measure 0-20 volts DC.

CHECK ENGINE Light (MIL)

Connect a jumper wire between STI connector and ground.

SUPER STAR II Tester

Turn ignition off. Connect adapter cable leads to diagnostic tester. Connect service adapter cables to vehicle self-test connectors. Ground
adapter cable.

SELF-TEST CONNECTOR LOCATION

SELF-TEST CONNECTOR WIRE COLORS

Fig. 1: Self-Test Connector Terminal ID

Courtesy of FORD MOTOR CO.

RETRIEVING CODES

Reading Service Codes

Application

Location

1.3L

Left Rear Corner Of Engine Compartment

1.6L

Right Rear Corner Of Engine Compartment

Circuit

Wire Color

1.3L

SML

Blue/Green

STI

Yellow/Green

STO

Yellow/White

1.6L

SML

Black/Blue

STI

Yellow

STO

Green/Black