MALFUNCTION DIAGNOSTIC CODES - DIESEL

Code No.

Malfunction

1 ⁽¹⁾

No System Malfunctions

Fuel Rack Position Sensor (L7)

Airflow Sensor (B2/1)

Atmospheric Pressure Sensor Within EDS Control Unit (N39)

5 ⁽²⁾

EGR Valve Vacuum Transducer (Y31/1) Or Malfunction In EGR Control Circuit

EDS Control Unit (N39), Internal Voltage Supply

Starter Ring Gear Speed Sensor (L3)

Coolant Temperature Sensor (EDS) (B11/4)

Intake Air Temperature Sensor (B2/1a)

Not Used

11 ⁽³⁾

Idle Speed Control Actuator Or EGR Valve Vacuum Transducer

Not Used

EDS Control Unit (N39) Defective (Internal Malfunction Memory)

Air Pressure Sensor (EDS) (B5/1) Defective

Intake Manifold Air Pressure Control Valve Vacuum Transducer (Y31/2) Or Wastegate Vacuum Transducer (Y31/3) Or Malfunction In Intake Manifold Air Pressure Control Circuit

⁽¹⁾	If no malfunction codes are present but driveability complaints exist, perform FUNCTION TESTING FOR ELR, EGR & P2 CONTROL - DIESEL.

⁽²⁾	This code is not stored in memory. If suspected, perform test step 5.0/5. Run engine over 900 RPM for minimum of 5 seconds. Note if code displays and voltmeter reads less than 3 volts.

⁽³⁾	This code is displayed only if circuit is shorted.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Trouble Code Definition

Use the Manual With the Right Hardware

When to See a Mechanic