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Volvo 850 pin voltage charts (turbo models)

 

J – PIN VOLTAGE CHARTS – TURBO

1995 Volvo 850

1995 ENGINE PERFORMANCE Volvo – Pin Voltage Charts
850 – Turbo

* 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 Powertrain Control Module (PCM) determines whether it is receiving and transmitting proper input and output signals. Charts may also help determine if PCM wiring harness is shorted or open.

TESTING

To read values requires the use of a OBD-II scan tester, DVOM, Breakout Box (981-3190) and Adapter (951-1351). Manufacturer does not recommend checking values directly at PCM connectors, as damage to wiring harness or PCM harness connector could occur. Unless otherwise specified, values specified in table are with ignition on and engine at normal operating temperature. Unless otherwise
specified, use terminal A42 for ground if testing PCM “A” connector or terminal B28 for ground if testing PCM “B” connector. See POWERTRAIN CONTROL MODULE (PCM) PIN VALUES table.

POWERTRAIN CONTROL MODULE (PCM) PIN VALUES

POWERTRAIN CONTROL MODULE (PCM) PIN VALUES TABLE
PCM Circuit Voltage
Terminal (Condition) (1)
A1
A2 Front Knock Sensor (Ignition On) Zero

A3

Mass Airflow Sensor Power Ground (Ignition On)

Zero

A4

Mass Airflow Sensor Signal (Ignition On)

Zero

Mass Airflow Sensor Signal (Engine Idling)

1

A5

Mass Airflow Sensor Signal Ground (Ignition On)

Zero

A6

RPM Sensor Signal Ground (Ignition On)

Zero

A7

Low Speed Cooling Fan (Fan Off)

Battery

Low Speed Cooling Fan (Fan On)

Less

Than

0.3
A8
A9 Injector No. 5 (Ignition On) Battery
Injector No. 5 (Engine Idling) (2) A10 Injector No. 1 (Ignition On) Battery
Injector No. 1 (Engine Idling) (2)
A11 Idle Air Control Valve Opening Signal (Ignition On) (3) IAC Valve Opening Signal (Engine Idling) (4)
A12 Power Supply (Ignition On) Battery A13 Power Ground (Ignition On) Zero A14 Front Oxygen Sensor Heating Signal (Ignition On) Battery A15 Throttle Position Sensor Power (Ignition On) 4.8
A16 Throttle Position Sensor Signal 0.5 (Ignition On & Closed Throttle)
Throttle Position Sensor Signal 4.2 (Ignition On & Wide Open Throttle)
A17 Front & Rear Knock Sensor Negative Signal Zero
(Ignition On)
A18 Sensor Ground Signal (Ignition On) Zero
A19 Rear Heated Oxygen Sensor (Ignition On) 0.7
A20 RPM Sensor Signal (Ignition On) Zero
RPM Sensor Signal (Engine Idling) (5) 1.5
A21 Crankshaft Position Sensor Signal (Ignition On) Zero
Or 5
A22 High Speed Cooling Fan (Fan Off) Battery
High Speed Cooling Fan (Fan On) Less
Than
0.3
A23 Injector No. 4 (Ignition On) Battery
Injector No. 4 (Engine Idling) (2) A24 Injector No. 3 (Ignition On) Battery
Injector No. 3 (Engine Idling) (2)
A25 Idle Air Control Valve Closing Signal (Ignition On) (6) IAC Valve Closing Signal (Engine Idling) (7)
A26 Power Supply From Battery (Ignition On) Battery
A27 Power Supply From Main Relay (Ignition On) Battery

Zero

Battery

(8)

A28

PCM Power Ground (Ignition On)

A29

Rear Heated Oxygen Sensor Control Signal

(Ignition On)

A30

Rear Knock Sensor Positive Signal (Ignition

On)

Zero

A31

Engine Coolant Temperature Sensor Signal

(Ignition On)
A32 Front Heated Oxygen Sensor Positive Signal (9) 1.1 (Ignition On) -1.2
Front Heated Oxygen Sensor Positive Signal 0-0.9 (Engine Idling) (Fluc
tuates)
A33 Front Heated Oxygen Sensor Negative Signal 0.7 (Ignition On)

A34

Rear Heated Oxygen Sensor Positive Signal

(Ignition On)

(9) Zero

A35

EGR Temperature Sensor Signal (Ignition On)

(10)

A36

Crankshaft Position Sensor Power Supply

(Ignition On)

1 Volt

< Battery

A37

A38

Injector No. 2 (Ignition On)

Battery

Injector No. 2 (Engine Idling)

(2)

A39

EVAP Valve Control Signal (Ignition On)

Battery

EVAP Valve Control Signal (Engine Idling)

(11)

A40

EGR Vacuum Controller (Ignition On)

Battery

A41

Main Relay Control Signal (Ignition On)

0.2

A42

PCM Signal Ground (Ignition On)

(12) Zero

B1

Acceleration Sensor Power Supply (Ignition On)

5

B2

Torque Reduction Signal From Transmission Control

Module (Ignition On)

1-2

Volts < Battery

B3

Torque Reduction Signal From Transmission Control

Module (Ignition On)

1-2

< Volts

Battery

B4

Torque Reduction Signal To Transmission Control

Module (Ignition On)

2 Volts

< Battery

B5

Diagnostic Test Lead (Ignition On)

1 Volt

<

Battery
B6 A/C Compressor Status Signal (Ignition On) Zero
B7 Malfunction Indicator Light Control Signal (MIL On) 0.8
MIL Control Signal (MIL Off) Battery
B8
B9 A/C Pressure Sensor Signal (Ignition On) 0.9
B10
B11 Power Stage Control Signal (Ignition On) 0.11
B12 Load Signal To Transmission Control Module 0.8 (Ignition On)

B13-B17

B18

Vehicle Speed Sensor Signal

0.5 Or

(Ignition On & Drive Wheel Turning)

Battery (Fluc tuates)

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)

0.8

B22

B23

Engine Coolant Temperature Sensor Signal

(Ignition On & Closed Throttle)

(13)

B24

PNP Idle Compensation Signal

(Ignition On, In Park Or Neutral)

PNP Idle Compensation Signal

1 Volt

< Battery

0.2

(Ignition On, Except In Park Or Neutral)

B25

A/C Relay Status Signal (Ignition On)

Zero

B26

MIL Operation Request Signal (Ignition On)

0-1

B27

Fuel Pump Control Signal (Ignition On)

1

B28

Sensor Signal Ground (Ignition On)

Zero

B29

A/C Pressure Sensor Power Supply (Ignition On)

5

B30

B31

B32

Acceleration Sensor Signal (Ignition On)

2.5

B33-B35
B36 Diagnostic Test Lead (Ignition On) 1-2
Volts
< Battery
B37
B38
B39 Fuel Consumption Signal (Ignition On) 0.2
B40 A/C Relay Control Signal (Ignition On) 9
B41 Turbo Control Valve Signal (Ignition On) (14) Battery
B42 Boost Pressure Limitation Signal (Ignition On) 1.2
Volts
< Battery
Boost Pressure Limitation Signal (Engine Idling) 0.3
B43
(1) – Check pin value between specified terminal and PCM terminal A42 (ground) if testing PCM “A” connector, or terminal B28 (ground) if testing PCM “B” connector.
(2) – Injector “On” time is 2.2-3.6 milliseconds. “On” time increases with engine speed and load.
(3) – 26 percent duty cycle. Duty cycle increases with engine load. (4) – Specification is 21-32 percent duty cycle. Duty cycle
increases with engine speed and load. (5) – A/C voltage.
(6) – Specification is 74 percent duty cycle.
(7) – Specification is 68-77 percent duty cycle. Duty cycle increases with engine speed and load.
(8) – Voltage is 1.6 volts with sensor temperature at 68 F (20 C)
or 0.15 volt with sensor temperature at 212 F (100 C). (9) – Measured with negative lead connected to terminal A42.
(10) – Voltage is 4 volts with sensor temperature at 68 F (20 C) or
1.2 volts with sensor temperature at 212 F (100 C). (11) – Zero-33 percent duty cycle.
(12) – Measured with negative lead connected to negative battery terminal.
(13) – Specification is measured in Hertz (Hz). Specification is 40
Hz with sensor temperature at 68 F (20 C) or 21.2 Hz with sensor temperature at 212 F (100 C).
(14) – Voltage decreases as pulsing of valve increases.

 

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