Ford Festiva. Instruction - part 43

Engine control system communicates malfunctions to technician through service codes. These service codes are 2-digit numbers representing a
particular defect. Service codes are transmitted through STO connector.

Service codes are displayed as timed pulses, and may be read with a VOM or Super Star II tester. VOM displays codes by needle sweeps. See

Fig. 2

Turn ignition off. Ensure all procedures of

EQUIPMENT HOOK-UP

have been followed. Engine should be at normal operating

temperature.

Fig. 2: Reading Service Codes With VOM

Courtesy of FORD MOTOR CO.

VOM

Disconnect and reconnect jumper wire from STI terminal to ground. Turn ignition on. Record displayed codes. Erase codes, and repeat test
procedure to verify all codes are currently valid. See

ERASING CODES & RETESTING

. Service only those codes which appear during

retest. Refer to

TROUBLE CODE DEFINITION

table to find appropriate pinpoint test.

MIL

Turn ignition on. Connect a jumper wire between STI connector and ground. Observe MIL, and record pulses to determine codes stored.

SUPER STAR II Tester

Set center button to TEST position. Turn ignition on. Turn tester on. When activated, tester should display 888 for 2 seconds. Release and
reset center TEST button. After all codes are displayed, release center button. All codes in tester memory may now be reviewed.

ERASING CODES & RETESTING

Erasing codes and retesting will give an indication of whether codes are hard or intermittent defects. Hard codes reset immediately and will be
displayed during retest.

Disconnect negative battery cable. Press brake pedal for 5-10 seconds. Turn off VOM or Super Star II tester. Reconnect battery. Perform tests
under

RETRIEVING CODES

to again display and record codes.

TROUBLE CODE DEFINITION

NOTE:

If MIL flashes continuously prior to connecting test equipment, go to

PINPOINT TEST STI

Service Code

Fault

Circuit & Pinpoint Test

Ignition Diagnostic Monitor

IDM

(1)

Crankshaft Position Sensor

CPS

(2)

Cylinder Identification Sensor

CID

(2)

Vehicle Speed Sensor

VSS

Vane Airflow Meter

VAF

Engine Coolant Temperature Sensor

ECT

Vane Air Temperature Sensor

VAT

(2)

Throttle Position Sensor

Barometric Pressure Sensor

Exhaust Gas Oxygen Sensor

EGO

Exhaust Gas Oxygen Sensor

EGO

(2)

Fuel Pressure Regulator Control Solenoid

PRC

Canister Purge Control Solenoid

CANP

Idle Speed Control

ISC

Codes Not Listed

Power & Ground Connections

PGC

CLEARING CODES

Clearing Codes Procedure

Disconnect negative battery cable. Press brake pedal for 5-10 seconds. Turn off VOM or Super Star II tester. Reconnect battery.

ECA LOCATION

ECA is located on center console behind kick panel on Capri, and under instrument panel on driver side of Festiva.

QUICK TESTS

KEY ON, ENGINE OFF (KOEO) SELF-TEST

KOEO

1. This is a test of electronic engine control system, conducted with power (voltage) applied and engine not running. Activate self-test, and

record all codes displayed.

2. Erase codes, and repeat self-test. Diagnose only codes occurring during repeat self-test. See

TROUBLE CODE DEFINITION

table. If

no codes are present, proceed to

KEY ON, ENGINE RUNNING (KOER) SELF-TEST

KOER

1. Deactivate self-test. Start and run engine at 2000 RPM for 2 minutes to warm up EGO sensor. Turn off engine and wait 10 seconds.
2. Restart engine, and activate self-test. Record all service codes displayed. See

TROUBLE CODE DEFINITION

table. If no codes are

present, proceed to

SWITCH MONITOR TEST

This test procedure checks input signals received by ECA from individual switches. Use following procedure to perform switch monitor test:



Turn engine off and allow it to cool.



Ensure all accessories are turned off.



Deactivate self-test.



Ensure transmission is in Neutral or Park.



Turn ignition on.

SUPER STAR II Tester

Connect Super Star II tester adapter cable. Turn on tester. Latch center button. Operate each switch listed in

SWITCH MONITOR TEST

table. Note output of LED on adapter cable as each switch operates. Record test results.

VOM

1. Ground STI connector. Connect VOM positive lead to SML terminal on self-test connector. Connect negative lead to ground. See

Fig.

2. Operate each switch listed in

SWITCH MONITOR TEST

table. Note output on VOM as each switch is operated. Go to specified

PINPOINT TEST if any switch does not meet specification.

SWITCH MONITOR TEST

(1)

Festiva only.

(2)

Capri only.

NOTE:

DO NOT move throttle during KOEO self-test.

NOTE:

It is necessary to clear codes in memory before performing this test. DO NOT move throttle during test.

NOTE:

All switches must be tested individually. Allowing a switch to remain on while testing another will lead
to false test results.

NOTE:

DO NOT move throttle, clutch, or transmission lever unless so directed.

Switch

VOM Indication/Condition

(1)

Pinpoint Test

A/C Switch

Less Than 1.5 Volts; A/C & Blower Switch On

STG

Blower Motor Switch

Less Than 1.5 Volts; Switch Set To "2" Or Higher

STG

Brake On/Off Switch

Less Than 1.5 Volts; Brake Pedal Partially

Pressed

STP

Clutch Engage/Neutral Gear Switch

(2)

Less Than 1.5 Volts; In Gear, Clutch Released

STG

Coolant Temperature Switch

Less Than 1.5 Volts; Cooling Fan On

STP

Defrost Switch

Less Than 1.5 Volts; Defrost Switch On

STP

Headlight Switch

Less Than 1.5 Volts; Headlight Switch On

STP

Idle Switch

Less Than 1.5 Volts; Accelerator Pedal Pressed

STG

WIGGLE TEST

Checking Circuitry

1. Visually inspect suspected sensor, switch, or solenoid. Enter WIGGLE TEST if using Super Star II tester. If using VOM, connect it to

STO terminal on self-test connector, and ground STI self-test connector terminal. Lightly tap sensor, switch, or solenoid.

2. Push and pull on suspected sensor, switch, or solenoid connector, but DO NOT unplug it. Test and wiggle harness vigorously, working

in small sections, from suspected device toward dash panel, and from dash panel to ECA.

3. If VOM or Super Star II tester does not display a positive indication of an intermittent defect, carefully disconnect suspected device.

Remove terminals from connector.

4. Inspect terminals at both ends for corrosion, bad crimps, or improperly seated terminals. Reconnect after inspection. Unplug harness

from ECA.

5. Inspect ECA and harness connector terminals for corrosion, bad crimps, or improperly seated terminals. If VOM does not indicate any

intermittent defect, reconnect wiring and erase codes.

PINPOINT TESTS

HOW TO USE PINPOINT TESTS

1. DO NOT perform any PINPOINT TEST unless directed by a QUICK TESTS procedure. Ensure all non-EEC related defects are

corrected. Follow each test step in order until defect is found. DO NOT replace any part unless so directed. When more than one service
code exists, start with first code displayed.

2. PINPOINT TESTS require ensuring electrical circuits are okay before replacing sensors or any other components. Always test circuits

for continuity between sensor and ECA. Test all circuits for shorts to power, opens, or shorts to ground. VREF and VPWR circuits
should be tested with KOEO or as specified in PINPOINT TESTS.

3. DO NOT measure voltage or resistance at ECA, or connect any test light unless specified in testing procedure. DO NOT pierce wiring.

Isolate both ends of a circuit and turn key off whenever checking for shorts or continuity, unless otherwise specified.

4. Disconnect solenoids and switches before checking circuit continuity or energizing solenoids.
5. An open is defined as any resistance greater than 10,000 ohms, unless otherwise specified.
6. To help diagnose circuits to ECA, turn ignition off and disconnect ECA harness. Connect BOB between ECA and ECA harness to

perform circuit and pinpoint tests.

PINPOINT TEST IDM - IGNITION DIAGNOSTIC MONITOR

Fig. 3: Identifying IDM Circuit & Connector

IDM CIRCUIT PIN IDENTIFICATION

Instruction Lever Position Switch

Less Than 1.5 Volts; Transaxle In Park Or Neutral

STP

Wide Open Throttle Switch

Less Than 1.5 Volts; Accelerator Pedal Fully

Pressed

STG

(1)

Proceed to PINPOINT TEST indicated if Super Star II tester/VOM indication is incorrect.

(2)

Not applicable to vehicles with A/T.

NOTE:

Following tests and illustrations are courtesy of Ford Motor Co. Complete EEC system wiring diagrams
may be found in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.

NOTE:

Check all wiring, harnesses, connectors, and components for damage, overheating, shorting, or
looseness. If any defect is found, repair as necessary before proceeding to any PINPOINT TEST.

NOTE:

Enter this test only when Code 01 is displayed during QUICK TESTS procedure or when directed here
from another PINPOINT TEST.

Circuit

ECA Pin

BOB Pin

Wire Color

1.3L

1. Connect spark tester between coil secondary wire and ground. Crank engine several times, leaving ignition on between cranking periods.

If continuous sparks jump tester gap, go to next step. If continuous sparks do not jump tester gap, go to step 3).

2. With ignition off, connect BOB, leaving ECA disconnected. Connect test light between test pins IDM and VPWR. Crank engine several

times. If test light flashes each time engine cranks, IDM circuit is okay. Return to QUICK TESTS if directed here from there. If test light
does not flash, repair IDM wire between ECA and coil.

3. Unplug connector from ignition coil. Connect test light between coil IDM wire and PWR wire. Crank engine several times, leaving

ignition on between cranking periods. If test light flashes continuously, go to next step. If test light does not flash continuously, go to
step 6).

4. Turn ignition on. Measure voltage between coil harness PWR wire and ground. If voltage is greater than 10 volts, replace coil. If voltage

is less than 10 volts, repair wire between ignition switch and coil.

5. Connect test light between PWR and ground terminals at coil harness connector. Turn ignition on. If test light glows, replace coil. If test

light does not glow, repair ground wire to coil.

6. Unplug connector from ignition module. Connect jumper wire between SPOUT wire on ignition module harness connector and mating

terminal on ignition module. Connect another jumper wire between ignition module GND wire and mating connector. Leave IDM wire
disconnected. Connect test light between IDM terminal on ignition module and PWR wire. Crank engine several times, leaving ignition
on between cranking periods. If test light flashes each time engine cranks, repair wire between ignition module IDM wire and coil. If test
light does not flash, go to next step.

7. Turn ignition off. Unplug ignition module connector. Turn ignition on. Measure voltage between ignition module PWR wire and ground.

Turn ignition on. If voltage is not more than 10 volts, repair PWR wire from ignition switch. If voltage is more than 10 volts, go to next
step.

8. Turn ignition off. Unplug ignition module connector. Turn ignition on. Connect test light between ignition coil PWR wire and ignition

module GND wire. Turn ignition on. If test light glows, go to step 10). If test light does not glow, go to next step.

9. Turn ignition off. Unplug ignition module connector. Connect test light between ignition coil PWR wire and ignition module SPOUT

wire. Crank engine. If test light flashes, check ignition module SPOUT wire for short to ground; if no short exists, replace ignition
module. If test light does not flash, go to next step.

10. Turn ignition off. Unplug ignition module connector. Install BOB, leaving ECA disconnected. Check SPOUT wire for continuity

between BOB test pin and ignition module. If continuity exists, check SPOUT wire for shorts to any other wire. If no short exists,
replace ECA. If continuity does not exist, repair SPOUT wire to ECA.

1.6L

1. Connect spark tester between coil secondary wire and ground. Crank engine several times, leaving ignition on between cranking periods.

If continuous sparks do not jump tester gap, go to step 3). If continuous sparks jump tester gap, go to next step.

2. Turn ignition off. Connect BOB. Leave ECA disconnected. Connect test light between test BOB pins IDM and VPWR. Crank engine

several times. If test light flashes each time engine cranks, IDM circuit is okay. Return to QUICK TESTS if directed here from there. If
test light does not flash, repair IDM wire between ECA and coil.

3. Unplug connector from ignition coil. Connect test light between coil IDM wire and PWR wire. Crank engine several times, leaving

ignition on between cranking periods. If test light does not flash continuously, go to step 6). If test light flashes continuously, go to next
step.

4. Turn ignition on. Measure voltage between coil harness PWR wire and ground. If voltage is greater than 10 volts, replace coil. If voltage

is less than 10 volts, repair wire between ignition switch and coil.

5. Connect test light between PWR and ground terminals at coil harness connector. Turn ignition on. If test light glows, replace coil. If test

light does not glow, repair ground wire to coil.

6. Unplug connector from ignition module. Connect a jumper wire between PWR wire on ignition module harness connector and mating

terminal on ignition module. Leave IDM wire disconnected. Connect test light between IDM terminal on ignition module and PWR
wire. Crank engine several times, leaving ignition on between cranking periods. If test light flashes each time engine cranks, repair wire
between ignition module IDM wire and coil. If test light does not flash. go to next step.

7. Unplug connector from ignition module. Measure voltage between ignition module PWR wire and ground. If voltage is not higher than

10 volts, repair PWR wire from ignition switch. If voltage is higher than 10 volts, go to next step.

8. Turn ignition off. Unplug ignition module connector. Turn ignition on. Connect test light between ignition module PWR wire and

ignition module GND wire. Turn ignition on. If test light glows, replace ignition module. If test light does not glow, repair ignition
module ground wire.

PINPOINT TEST CPS - CRANKSHAFT POSITION SENSOR

1.3L

GND

39, 40, 44, 60

BLK

IDM

(1)

YEL/GRN

PWR

(1)

BLK/WHT

SPOUT

BLU/ORG

1.6L

IDM

YEL/BLU

PWR

*****

BLK/WHT

(1)

ECA and BOB pins not specified.

NOTE:

Enter this test only when Code 02 is displayed during QUICK TESTS procedure or when directed here
from another PINPOINT TEST.

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