Engine Controls - Pin Voltage Charts: Introduction

NOTE: Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate.

Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at the Powertrain Control Module (PCM) determines whether it is receiving and transmitting proper voltage signals. Charts may also help determine if PCM wiring harness is shorted or open.

Fig 1: PCM Connector Terminal ID (Festiva)

Courtesy of FORD MOTOR CO.

Fig 2: PCM Connector Terminal ID (Capri)

NOTE: For additional pin voltage information, see appropriate trouble code information in G - TESTS W/ CODES article in this section.

SENSOR/ACTUATOR ABBREVIATION DEFINITION

Abbreviation	Definition
BARO	Barometric Pressure Sensor Or Circuit
BOO	Brake On/Off Switch
CANP	Canister Purge Control Solenoid
CES	Clutch Engage Switch
ECT	Engine Coolant Temperature Sensor
FPRC	Fuel Pressure Regulator Control
IDL	Idle Switch
IDM	Ignition Diagnostics Monitor
ISC	Idle Speed Control
MIL	Malfunction Indicator Light
NGS	Neutral Gear Switch
O2S	Oxygen Sensor
PSPS	Power Steering Pressure Switch
STO	Self-Test Output Circuit
TP	Throttle Position Sensor or Circuit
VAF	Vane Air Flow Sensor or Circuit
VAT	Vane Air Temperature

ECA PIN VOLTAGE (CAPRI-NON TURBO) ⁽¹⁾

Application/ (Pin #)

Ref. Pin #

KOEO

Hot Idle

30 MPH

55 MPH

Sensors

TP (2G)

SIGRTN

0.5V

0.6V

0.8V

VAF (2E)

SIGRTN

1.8V

6.7V

8.0V

8.2V

ECT (2I)

SIGRTN

2.5V

0.4V

0.5V

BP (2H)

SIGRTN

3.9V

3.8V

VAT (2J)

PWRGND

2.4V

IDL (1E)

PWRGND

12.6V

12.4V

NGS/CES (1G)

PWRGND

12V

BOO (1J)

PWRGND

12V ⁽²⁾

PSPS(1K)

PWRGND

12V

14V

IDM (1M)

PWRGND

N/A

850-1050 RPM

2650-2700 RPM

3125-3175 RPM

EGO (2D)

PWRGND

N/A

0.8V

0.5V

0.6V

Actuators

CANP(2P)

PWRGND

12V ⁽³⁾

14.3V ⁽³⁾

14V ⁽³⁾

ISC (2Q)

PWRGND

10V

9.7V

9.8V

PRC (2K)

PWRGND

12V

14V

14.3V

14V

STO (1B)

PWRGND

0.7V

14V

13.8V

MIL (1A)

PWRGND

1.6V

13.2V

14V

13.8V

⁽¹⁾	Reference values shown may vary approximately +/- 20% depending on operating conditions and other factors.

⁽²⁾	Brake pedal pressed.

⁽³⁾	Test in manual DC volts.

ECA PIN VOLTAGE (CAPRI TURBO) ⁽¹⁾

Application/ (Pin #)

Ref. Pin #

KOEO

Hot Idle

30 MPH

55 MPH

Sensors

TP (2G)

SIGRTN

0.4V

0.36V

0.5V

0.67V

VAF (2E)

SIGRTN

5.5V

7.4V

8.1V

ECT (2I)

SIGRTN

2.5V

0.4V

0.5V

BP (2H)

SIGRTN

3.9V

3.8V

VAT (2J)

PWRGND

2.2V

2.3V

2.6V

2.7V

IDL (1E)

PWRGND

13.9V

NGS/CES (1G)

PWRGND

12V

BOO (1J)

PWRGND

12V

12V ⁽²⁾

PSPS(1K)

PWRGND

12V

13.6V

13.7V

IDM (1M)

PWRGND

N/A

800-900 RPM

2640-2680 RPM

3120-3160 RPM

EGO (2D)

PWRGND

N/A

0.5V

Actuators

CANP(2P)

PWRGND

12V ⁽³⁾

14.3V ⁽³⁾

14V ⁽³⁾

ISC (2Q)

PWRGND

7.5V

7.6V

9.4V

9.6V

PRC (2K)

PWRGND

12V

14V

STO (1B)

PWRGND

0.71V

13.5V

MIL (1A)

PWRGND

1.6V

13.6V

13.7V

13.6V

⁽¹⁾	Reference values shown may vary approximately +/- 20% depending on operating conditons and other factors.

⁽²⁾	Brake pedal pressed.

⁽³⁾	Test in manual DC volts.

ECA PIN VOLTAGE (FESTIVA)

Application/ (Pin #)

Ref. Pin #

KOEO

Hot Idle

30 MPH

55 MPH

Sensors

VAF (2O)

PWRGND

4.0V

3.0V

1.5V

1.2V

VAT (2P)

PWRGND

3.0V

3.3V

ECT (2Q)

PWRGND

0.36V

0.46V

0.50V

WOT (2L)

PWRGND

5.0V

IDL (1N)

PWRGND

14V

CPS (2E)

PWRGND

N/A

730-800 RPM

1350-1400 RPM

2350-2400 RPM

HDLT(1U)

PWRGND

12V ON

BLMT(1S)

PWRGND

12V ⁽¹⁾

14V ⁽¹⁾

EGO (2N)

PWRGND

N/A

0.2-0.75V

BOO (1O)

PWRGND

ACS (1Q)

PWRGND

12V ⁽²⁾

14V ⁽²⁾

PSPS(1P)

PWRGND

12V

14V

FAN (1R)

PWRGND

12V

14V

NGS/CES (1V)

PWRGND

14V ⁽³⁾

Actuators

STO (1F)

PWRGND

0.6V

12V

WAC (1J)

PWRGND

12V

ISC (2W)

PWRGND

7.45V

10.5V

10.8V

10.6V

SPOUT (1G)

PWRGND

N/A

730-800 RPM

1350-1400 RPM

2350-2400 RPM

CANP(2X)

PWRGND

12V

10-11V

12-14V

MIL (1E)

PWRGND

1.5V

12V

⁽¹⁾	Blower off.

⁽²⁾	A/C on/blower on.

⁽³⁾

In gear.