Trouble Code Definition

NOTE: Trouble code definitions for 318ti is not available from the manufacturer.

FAULT CODE IDENTIFICATION (318i & 318is - DME 1.7)

Fault Codes

Affected Circuit

Probable Cause

Fuel Pump Relay

⁽¹⁾ Shorted Relay Or Circuit To DME Control Unit Pin No. 1

Fuel Injectors (Cyl. No. 1 & 3)

⁽²⁾ Shorted/Open Circuit Their Circuit Wiring

CHECK ENGINE Light

Shorted Circuit On Indicator Light Or Its Circuit Wiring

Throttle Potentiometer (TPS)

Shorted/Open Circuit In Sensor Or Its Circuit Wiring

Camshaft Sensor

Faulty Signals From Camshaft Sensor At 2500 RPM

Idle Speed Control

Shorted Circuit In Wiring To DME Control Unit Pin No. 29

Fuel Injectors (Cyl. No. 2 & 4)

Shorted/Open Circuit In Fuel Injectors Or Their Circuit Wiring

Fuel Tank Venting Valve

Shorted/Open Circuit On Fuel Tank Venting Valve Or Its Circuit Wiring

Oxygen Sensor Heater Relay

Shorted/Open Relay Or Circuit To DME Control Unit Pin No. 37

Airflow Sensor

Shorted/Open Circuit On Airflow Sensor Or Its Circuit Wiring Or Sensor Out Of Range

DME Power Supply

⁽³⁾ Voltage To DME Control Unit Drops To Less Than 9 Volts Or Exceeds 16 Volts

Oxygen Sensor

⁽⁴⁾ Shorted/Open Circuit

Speed Sensor (Signal)

⁽⁵⁾ Faulty Speed Sensor Input Signal

Intake Air Temp. Sensor

⁽⁶⁾ Shorted/Open
Circuit On Sensor Or Circuit On Sensor Or

Engine (Coolant) Temp. Sensor

Shorted/Open Circuit On Engine Temp. Sensor Or Its Circuit Wiring

A/C Compressor

⁽⁷⁾ Open Circuit On Pin No. 86 And Short To Battery On Pin No. 85

100

Final Stage (Output Signal)

Loose Connection On Final Stage Output Signal

200

DME Control Unit

Faulty DME Control Unit Memory Modules

201

Oxygen Sensor Control

Rich Or Lean Air/Fuel Mixture For At Least 8 Seconds

⁽¹⁾	Fault is recognized only when at least one additional final stage (output signal) is faulty.

⁽²⁾	Injector group is deactivated with a short circuit in either injector or its power supply wiring. Cylinders No. 2 and 4 remain in operation.

⁽³⁾	Check connections and wiring harness for resistance, incorrect alternator belt tension and defective alternator or voltage regulator.

⁽⁴⁾	Engine coolant temperature must be at least 158°F (70°C) and an engine load signal must be 4.5 milliseconds for at least 5 seconds.

⁽⁵⁾	Fault is set when engine speed is 4500 RPM, engine load signal is 4.0 milliseconds and vehicle speed is 3-5 MPH.

⁽⁶⁾	Recognition of an open circuit requires at least 3 minutes time after starting engine and an idle speed for 30 seconds (minimum).

⁽⁷⁾	Fault is set when DME control unit simultaneously receives battery voltage on pin No. 85 and zero volts on pin No. 86.