Ford Festiva. Manual — part 44

Fig. 4: Identifying CPS Circuit & Connector

CPS CIRCUIT PIN IDENTIFICATION

1. Turn ignition off. Install BOB. Leave ECA disconnected. Unplug distributor connector. Measure resistance of CPS, VPWR, and GND

wires between ECA and distributor. If all resistances are not less than 5 ohms, repair wire in question. If all resistances are less than 5
ohms, go to next step.

2. Turn ignition off. Unplug distributor connector. Turn ignition on. Measure voltage between distributor VPWR and GND wires. If

voltage is more than 10 volts, replace CPS sensor. If voltage is not more than 10 volts, repair distributor GND wire.

PINPOINT TEST CID - CYLINDER IDENTIFICATION SENSOR

Fig. 5: Identifying CID Circuit & Connectors

CID CIRCUIT PIN IDENTIFICATION

1. Turn ignition off. Install BOB, leaving ECA disconnected. Unplug distributor connector. Measure resistance between BOB pin No. 34

and CID terminal on distributor harness connector. Repair Yellow wire between ECA and distributor if resistance is greater than 5
ohms. If resistance is less than 5 ohms, go to next step.

2. Turn ignition on. Measure voltage between distributor VPWR and GND wires. If voltage is greater than 10 volts, replace CID sensor. If

voltage is not greater than 10 volts, repair distributor GND wire.

PINPOINT TEST KC - KNOCK CONTROL

Circuit

ECA Pin

BOB Pin

Wire Color

CPS

2E

56

YEL/BLU

GND

2A

39, 40, 44, 60

BLK

GND

2B

20

BLK

GND

2C

16

BLK

VPWR

1B

37, 57

YEL/BLK

NOTE:

Enter this test only when Code 03 is displayed during QUICK TESTS procedure or when directed here
from another PINPOINT TEST.

Circuit

ECA Pin

BOB Pin

Wire Color

CID

1N

34

YEL

NOTE:

Enter this test only when directed here from QUICK TESTS.

Fig. 6: Identifying KC Circuit & Connectors

1. Disconnect and plug vacuum hose at distributor. Connect timing light. Start engine. Unplug knock control service connector, located

near ECA. If timing retards, service knock sensor and/or knock sensor wiring. If timing does not retard, go to next step.

2. Determine and record ignition timing setting. Tap intake plenum with plastic mallet. If timing does not retard, go to step 4). If timing

retards, go to next step.

3. Reconnect knock control service connector, located near ECA. Determine and record ignition timing setting. Tap intake plenum with

plastic mallet. If timing does not retard, knock control unit is okay; go to next step. If timing retards, replace knock control unit.

4. Turn ignition off. Unplug knock control service connector, located near ECA. Install a known good knock sensor. Start engine. Tap

intake plenum with plastic mallet. If timing retards, replace knock sensor. If timing does not retard, go to next step.

5. Check VPWR and GND (Yellow/Green and Black/Yellow wires respectively) to knock control unit for shorts or open circuits. Service

wires as necessary. If wires are okay, replace knock control unit.

PINPOINT TEST VSS - VEHICLE SPEED SENSOR

Fig. 7: Identifying VSS Circuit & Connectors

VSS CIRCUIT PIN IDENTIFICATION

1. Install 4EAT Tester Leave 4EAT module disconnected. Disconnect speedometer cable at transaxle. Measure resistance between BOB

VSS and GND test pins. Rotate speedometer cable. If resistance drops to less than 5 ohms 4 times for each revolution of speedometer
cable, VSS is okay. Return to QUICK TESTS if sent here from there; otherwise, replace 4EAT module. If resistance does not drop as

NOTE:

Enter this test only when Code 06 is displayed during QUICK TESTS procedure or when directed here
from another PINPOINT TEST.

Circuit

4EAT Pin

Wire Color

GND

1J

BLK

VSS

1P

GRN/RED

specified, go to next step.

2. Unplug VSS connector at instrument cluster. Measure resistance between VSS and GND terminals on instrument cluster. Rotate

speedometer cable. If resistance drops to less than 5 ohms 4 times for each revolution of speedometer cable, repair VSS signal wire to
4EAT. If resistance does not drop as specified, replace speedometer assembly.

PINPOINT TEST VAF - VANE AIRFLOW METER

Fig. 8: Identifying VAF Meter Circuits

VAF CIRCUIT PIN IDENTIFICATION

1.3L

1. Turn ignition off. Install BOB. Turn on ignition. Measure voltage between VAF and ground pins while moving vane in VAF meter.

Voltage should vary smoothly between .5-1.5 volts with door open, and 4.5-5.0 with door closed. If voltage is as specified, VAF meter
is okay; return to QUICK TESTS if sent here from there. If not sent here from QUICK TESTS, replace ECA. If voltage is not as
specified, go to next step.

2. Remove connector from VAF meter. Using jumper wires, connect VREF and ground terminals on VAF connector to corresponding

terminals on VAF meter. Turn ignition on. Measure voltage between VAF terminal on VAF meter and ground terminal while moving
vane in VAF meter. Voltage should vary smoothly between .5-1.5 volts with door open, and 4.5-5.0 with door closed. If voltage is
correct, repair VAF circuit between ECA and VAF meter. If voltage is not as specified, go to next step.

3. Turn ignition off. Unplug VAF meter connector. Turn ignition on. Measure voltage between VREF and ground wires. If voltage is 4.5-

5.5 volts, replace VAF meter. If voltage is not 4.5-5.5 volts, go to PINPOINT TEST VREF.

1.6L

1. Turn ignition off. Install BOB. Turn ignition on. Measure voltage between VAF and SIGRTN pins while moving vane in VAF meter.

Voltage should be as specified in VAF METER VOLTAGE table. If voltage is not as specified, go to step 3). If voltage is as specified, go
to next step.

2. Measure voltage between VMREF and SIGRTN test pins. If voltage is 7-9 volts, circuit is okay; return to QUICK TESTS if sent here

from there. If not sent here from QUICK TESTS, replace ECA. If voltage is not as specified, repair VMREF wire to VAF.

3. Unplug connector from VAF meter. Using jumper wires, connect VPWR, VMREF, and SIGRTN terminals on VAF connector to

corresponding terminals on VAF meter. Leave VAF wire disconnected. Measure voltage between VAF and SIGRTN pins on harness

NOTE:

Enter this test only when a Code 08 is displayed during QUICK TESTS procedure, or when directed here
from another PINPOINT TEST. To avoid unnecessary diagnostic time, check for unmetered air leaks
between VAF meter and throttle body. This test is intended to diagnose only VAF and VREF circuits.

Circuit

ECA Pin

BOB Pin

Wire Color

1.3L

GND

2A

45

BLK

VAF

2O

25

WHT

VREF

2D

46, 49

BLK

1.6L

SIGRTN

2C

46

BLK/YEL

VAF

2E

43

LT GRN/BLK

VMREF

2B

18

LT GRN/RED

VPWR

3I

37

YEL/GRN

connector while moving vane in VAF meter. Voltage should be as specified in

VAF METER VOLTAGE

table. If voltage is okay,

repair VAF wire to ECA. If voltage is not okay, go to next step.

VAF METER VOLTAGE

4. Unplug connector from VAF. Using jumper wires, connect VPWR and SIGRTN terminals on VAF connector to corresponding terminals

on VAF meter. Leave VAF and VMREF wires disconnected. Measure voltage between VAF terminal at VAF meter, and SIGRTN pin at
harness connector while moving vane in VAF meter. Voltage should be as specified in

VAF METER VOLTAGE

table. If voltage is

okay, repair VMREF wire to ECA. If voltage is not okay, go to next step.

5. Unplug connector from VAF meter. Turn ignition on. Measure voltage between SIGRTN and VPWR wire. If voltage is more than 10

volts, replace VAF meter. If voltage is not more than 10 volts, go to next step.

6. Unplug VAF meter connector. Turn ignition on. Measure voltage between VAF meter VPWR wire and ground. If voltage is more than

10 volts, repair VAF wire to ECA. If voltage is not more than 10 volts, go to PINPOINT TEST VPWR.

PINPOINT TEST ECT - ENGINE COOLANT TEMPERATURE SENSOR

Fig. 9: Identifying ECT Sensor Circuits

ECT CIRCUIT PIN IDENTIFICATION

1.3L

1. Turn ignition off. Install BOB. Leave ECA disconnected. Unplug ECT connector. Check for continuity between ECT test pin and ECT

terminal (Red/Blue wire) on ECT harness connector. If continuity does not exist, repair ECT wire between ECA and ECT sensor. If
continuity exists, go to next step.

2. Unplug ECT sensor. Check for continuity between Black wire at ECT sensor and ground. If continuity does not exist, repair Black wire

between ECT sensor and ground. If continuity exists, go to next step.

3. Reconnect ECA. Measure resistance between BOB ECT test pin and ground pin. If resistance is 500-1000 ohms, replace ECA. If

resistance is not 500-1000 ohms, replace ECT sensor.

1.6L

1. Turn ignition off. Install BOB. Leave ECA disconnected. Unplug ECT connector. Check for continuity between ECT test pin and ECT

terminal (Blue/Red wire) on ECT harness connector. If continuity does not exist, repair ECT wire between ECA and ECT sensor. If

Door Position

Volts

1/8 Open

3.24

1/4 Open

5.60

3/8 Open

5.62

1/2 Open

5.83

5/8 Open

6.02

3/4 Open

6.57

7/8 Open

7.46

Full Open

7.87

NOTE:

Enter this test only when a Code 09 is displayed during QUICK TESTS procedure or when directed here
from another PINPOINT TEST. To prevent unnecessary diagnosis, inspect coolant level, oil level,
cooling fan, thermostat, and airflow to radiator before testing.

Circuit

ECA Pin

BOB Pin

Wire Color

1.3L

ECT

2Q

7

RED/BLU

GND

(1)

(1)

BLK

1.6L

ECT

2I

7

BLU/RED

SIGRTN

2C

46

BLU/YEL

(1)

Not specified.