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Volvo 850 pin voltage charts (non-turbo)

Volvo 850 service & repair manual

VOLVO 850 PIN VOLTAGE CHARTS

1995 Volvo 850

1995 ENGINE PERFORMANCE Volvo – Pin Voltage Charts
850

* PLEASE READ THIS FIRST *

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.

INTRODUCTION

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

TESTING

To read values requires the use of a scan tester, DVOM, Breakout Box (981-3190) and Adapter (981-3195). DO NOT measure resistance/voltage at ECU. Manufacturer does not recommend checking values directly at ECU connectors, as damage to wiring harness or ECU harness connector could occur. Unless otherwise specified, values specified in table are with ignition on and engine at normal operating temperature. Values are measured between ground terminal A20 and specified ECU terminal. See ECU PIN VALUES – FUEL INJECTION table or ECU PIN VALUES TABLE – IGNITION.

ECU PIN VALUES – FUEL INJECTION

ECU PIN VALUES TABLE – FUEL INJECTION

Voltage

ECU

Circuit

Terminal

(Condition)

(1)

A1

Throttle Position Sensor

Signal

0.5

(Ignition On & Closed Throttle)
Throttle Position Sensor Signal 4.2 (Ignition On & Wide Open Throttle)
A2 Throttle Position Sensor Power Supply (Ignition On) 5
A3-A7
A8 Mass Airflow Sensor Power Ground (Ignition On) Zero A9 Injectors Control Signal (Ignition On) Zero Injectors Control Signal (Engine Idling) (2)
A10 Power Supply From Battery (Ignition On) Battery
A11
A12 Mass Airflow Sensor Signal Ground (Ignition On) Zero
A13 Mass Airflow Sensor Signal (Ignition On) 2.8
Mass Airflow Sensor Signal (Engine Idling) 3.6
A14 Sensor Ground (Ignition On) Zero A15 Engine Coolant Temperature Sensor (Ignition On) (3) A16 Idle Air Control Valve Opening Signal (Ignition On) (4)
IAC Valve Opening Signal (Engine Idling) 11-11.5
A17 Idle Air Control Valve Closing Signal (Ignition On) (5) IAC Valve Closing Signal (Engine Idling) (6)
A18
A19 Power Supply From Main Relay (Ignition On) Battery
A20 Signal Ground (Always) (7)

A21

A22

Heated Oxygen Sensor Signal (Ignition On) Heated Oxygen Sensor Signal (Engine Idling)

0.45

0.1-0.9

(Fluct

-uates)

A23

Heated Oxygen Sensor Ground (Always)

Zero

A24

Main Relay Control Signal (Ignition On)

1

A25

A/C Compressor (Ignition On)

Zero

A/C Compressor (Engine Idling)

(8)

A26

A27

Air Injection Control Solenoid Signal

(Solenoid Activated)

Zero

Air Injection Control Solenoid Signal

(Solenoid Deactivated)

Battery

A28

Heated Oxygen Sensor Preheater (Ignition On)

Battery

Heated Oxygen Sensor Preheater (Engine Idling)

0.5

A29

System Ground (Always)

Zero

A30

Power Supply From Ignition Switch (Ignition On)

Battery

B1-B4

B5

Data Link Connector Test Lead (Ignition On)

Battery

B6

B7 Malfunction Indicator Light (MIL) Control Signal 0.5 (MIL On)
Malfunction Indicator Light (MIL) Control Signal Battery
(MIL Off)

B8-B11

B12

B13-B17

B18

Load Signal (Ignition On) Load Signal (Engine Idling)

Vehicle Speed Sensor Signal

Zero

(9)

0.6-7

(Ignition On & Drive Wheel Turning)

B19

B20

Throttle Position Sensor Signal

(Ignition On & Closed Throttle)

0.5

Throttle Position Sensor Signal

(Ignition On & Wide Open Throttle)

4.2

B21

Tachometer Signal (Ignition On)

Zero

Tachometer Signal (Engine Idling)

4-7

B22

Air Injection Pump Relay Signal (Relay On)

Zero

Air Injection Pump Relay Signal (Relay Off)

Battery

B23

Engine Coolant Temperature Signal (Ignition On)

6

B24

PNP Idle Compensation Signal

(Ignition On, In Park Or Neutral)

5

PNP Idle Compensation Signal

(Ignition On, Except In Park Or Neutral)

0.1

B25

B26

Idling Compensation Signal (Ignition On)

11

B27

Fuel Pump Relay Control Signal (Ignition On)

7.5

Fuel Pump Relay Control Signal (Engine Idling)

4.5

B28

B29

Fuel Consumption Signal

(Ignition On, Models With Trip Computer)

0.8

Fuel Consumption Signal

Zero

(Ignition On, Models Without Trip Computer)

(1) – Check pin value between ECU ground terminal A20 and specified
ECU terminal.
(2) – Specification is 0.3 volt. Injector “On” time is 2.0-2.5 milliseconds. Voltage and “On” time increases with engine speed and load.
(3) – Specification is 1.8 volts with sensor temperature at 68 F (20 C) or 200 millivolts with sensor temperature at 212 F (100 C). Voltage decreases as temperature increases.
(4) – Specification is 2.2 volts on models with chassis No. 30699 or less, or 3.4 volts on models with chassis No. 30700 or greater and all 5-door models.
(5) – Specification is 12 volts on models with chassis No. 30699 or less, or 10.5 volts on models with chassis No. 30700 or greater.
(6) – Specification is 7.5 volts on models with chassis No. 30699 or less, or 4.5 volts on models with chassis No. 30700 or greater.
(7) – Measured with negative lead connected to negative battery terminal.
(8) – Zero voltage with A/C off. Battery voltage with A/C on. (9) – Frequency is 34 Hz. Duty cycle is 99.8 percent. Frequency
increases and duty cycle percentage decreases with engine speed.

ECU PIN VALUES – IGNITION

ECU PIN VALUES TABLE – IGNITION
ECU Circuit Voltage
Terminal (Condition) (1)
A1 RPM Sensor Signal (Ignition On) Zero
RPM Sensor Signal (Engine Idling) 1.2 AC Volts
A2 RPM Sensor Ground (Ignition On) Zero
A3
A4 Camshaft Position Sensor Signal (Ignition On) (2) 5
Or Zero
A5 EGR Temperature Sensor Signal (Ignition On) (3) A6-A9
A10 Power Supply From Battery (Ignition On) Battery
A11-A13
A14 Camshaft Position Sensor Power Supply (Ignition On) Battery A15 Camshaft Position Sensor Ground (Ignition On) Zero A16 EGR Temperature Sensor Ground (Ignition On) Zero A17 Low Speed Cooling Fan (Fan Off) Battery
Low Speed Cooling Fan (Fan On) Zero
A18-A19
A20 ECU Signal Ground (Ignition On) (4) Zero

A21

A22

Front Knock Sensor Signal (Ignition On)

Zero

A23

Front Knock Sensor Ground (Ignition On)

Zero

A24

Rear Knock Sensor Ground (Ignition On)

Zero

A25

Rear Knock Sensor Signal (Ignition On)

Zero

A26

High Speed Cooling Fan (Fan Off)

Battery

High Speed Cooling Fan (Fan On)

Zero

A27

EGR Controller Signal (Ignition On)

Battery

A28

Control Unit Cooling Fan Signal (Fan Off)

Battery

Control Unit Cooling Fan Signal (Fan On)

0.8

A29

System Ground (Always)

Zero

A30

Power Supply From Ignition Switch (Ignition On)

Battery

B1

B2

Torque Control Signal From TCM (Ignition On)

5

B3

Torque Control Signal From TCM (Ignition On)

5

B4

Torque Control Acknowledgment Signal (Ignition On)

5

B5

Data Link Connector Test Lead (Ignition On)

Battery

B6

B7

Malfunction Indicator Light (MIL) Control Signal

(MIL On)

Zero

Malfunction Indicator Light (MIL) Control Signal

(MIL Off)

Battery

B8

Variable Intake Manifold Solenoid Signal

(5)

(Solenoid Closed)
Variable Intake Manifold Solenoid Signal (6) (Solenoid Open)

B9-B11

B12

Load Signal (Ignition On)

Zero

Load Signal (Engine Idling)

(7)

B13

Power Stage Control Signal (Ignition On)

0.15

Power Stage Control Signal (Engine Idling)

0.6

B14-B17

B18

Vehicle Speed Sensor Signal

0.6-7

(Ignition On & Drive Wheel Turning)

B19

B20

Throttle Position Sensor Signal

0.5

(Ignition On & Closed Throttle)

Throttle Position Sensor Signal

(Ignition On & Wide Open Throttle)

4.2

B21

Tachometer Signal (Ignition On)

Zero

Tachometer Signal (Engine Idling)

4-7

B22

B23 Engine Coolant Temperature Signal (Ignition On) 6
B24
B25 A/C Acknowledgment Signal (Engine Idling & A/C Off) Zero
A/C Acknowledgment Signal (Engine Idling & A/C On) Battery
B26 Idling Compensation Signal Battery

B26

(Engine Idling & Engine Cooling Fan Off)

Idling Compensation Signal

0.7

(Engine Idling & Engine Cooling Fan On)

B27

A/C High Pressure Switch (Ignition On)

Zero

B28

A/C Control Signal (Ignition On)

7-12

A/C Control Signal (Engine Idling & A/C On)

Zero

A/C Control Signal (Engine Idling & A/C Off)

Battery

B29

Rev Counter Signal (Ignition On)

11

Rev Counter Signal (Engine Idling)

6.5

B30

(1) – Check pin value between ECU ground terminal A20 and specified
ECU terminal.
(2) – Specification is dependent on camshaft position.
(3) – 4.6 volts with sensor temperature at 32 F (0 C) or 1.8 volts with sensor temperature at 176 F (80 C). Voltage decreases as temperature increases.
(4) – Measured with negative lead connected to negative battery terminal.
(5) – Specification is battery voltage on models with chassis No.
30699 or less, or 0.5 volt on models with chassis No. 30700 or greater and all 5-door models.
(6) – Specification is 0.5 volt on models with chassis No. 30699 or less, or battery voltage on models with chassis No. 30700 or greater.
(7) – Frequency is 34 Hz. Duty cycle is 99.8 percent. Frequency increases and duty cycle percentage decreases with engine speed.

 

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