Understanding Diagnostic Information: Terminology

When using DIAGNOSTIC TESTS, terminology may differ between fault code identification and fault code diagnostic. The following components or systems may be identified 2 different ways:

Air pressure sensor may be referred to as pressure sensor.
Engine speed sensor may be referred to as starter ring gear speed sensor.
Fuel rack position sensor may be referred to as control rod travel sensor.

EDS components and connections are identified by the manufacturer with special designations in diagnosis information. See the COMPONENT IDENTIFICATION table.

COMPONENT IDENTIFICATION

Component ⁽¹⁾

Manufacturer's Designation

A/C Compressor Cut-Out/EGR Microswitch

S27/6

Air Pressure Sensor

B5/1

Airflow Sensor Potentiometer

B2/1

Boost Pressure Control Vacuum Transducer

Y31/4

Boost Press. Control/Press. Control Flap Vacuum Transducer

Y31/5

Boost Pressure Control Switchover Valve

Y27/4

Boost Pressure Cut-Out Switchover Valve

Y31/6

Control Rod Travel Sensor

Diagnostic Connector

X11/4

EDS Control Unit ⁽²⁾

N39

EGR Miroswitch

S27/3

EGR Switchover Valve

Y27

EGR Vacuum Transducer

Y31/1

ELR Actuator

Y22

Engine Coolant Sensor

B11/4

Engine Speed Sensor

Engine Speed Sensor Connector ⁽³⁾

L3x1

Intake Air Temperature Sensor

B2/1a

Key Shutoff Relay

N17/3

Key Shutoff Switchover Valve

Y9/1

⁽¹⁾	Not all components are used on all engines.

⁽²⁾	EDS control unit is referred to as N39 by the manufacturer. When diagnosing EDS, test connections are made at EDS control unit (N39) using Contact Box (124 589 00 21 00).

⁽³⁾	Located in right rear corner of engine compartment on 5-cylinder engine. Located on middle left side of cylinder head on 6-cylinder engine.