Fault Code Definition

After identifying malfunctioning component or system, see FAULT CODE DIAGNOSIS charts under DIAGNOSTIC TESTS.

FAULT CODE IDENTIFICATION

Fault Code

Component/System

Designation

1 ⁽¹⁾

All Functions Normal

N/A

Fuel Rack Position Sensor

Airflow Sensor

B2/1

4 ⁽²⁾

EDS Control Unit

N39

5 ⁽³⁾

EGR Vacuum Transducer Or EGR Valve System

Y31/1

EDS Control Unit (Internal Power Supply)

N39

Engine Speed Sensor

Engine Coolant Sensor

B11/4

Intake Air Temperature Sensor

B2/1a

EDS Control Unit Power Supply

N39

11 ⁽⁴⁾

ELR Actuator

Y22

Or Boost Pressure Cut-Out Switchover Valve

Y31/6

Or EGR Vacuum Transducer

Y31/1

Not Used

EDS Control Unit Defective

N39

14 ⁽⁵⁾

EDS Pressure Sensor Defective

B5/1

Boost Pressure Control Vacuum Transducer Or Defect In Boost Pressure Control Circuit

Y31/4

⁽¹⁾	If no fault codes are displayed on pulse counter and driveability or customer complaints are present, perform functional test on ELR and EGR. See appropriate FUNCTIONAL TEST chart under DIAGNOSTIC TESTS .

⁽²⁾	EDS control unit atmospheric pressure sensor is malfunctioning. Atmospheric pressure sensor is internal to EDS control unit.

⁽³⁾	Pulse counter will only display at 900 RPM for at least 5 seconds. Fault is not stored.

⁽⁴⁾	Pulse counter only displays fault code if a short circuit is present.

⁽⁵⁾	Pressure sensor is located in left rear corner of engine compartment, on firewall.