Computer diagnostics of the diesel engine M21D24, DDE 1.0 on BMW E34

ECU identification for the M21D24 diesel engine (DDE 1.0) in a BMW E34

ECU Identification

DDE 1.0 for the M21 engine with turbocharger and two control units

Injection Start Control Unit:

Fuel Quantity Control Unit:

12 Intake Air Temperature Sensor

14 Injection Start Sensor

DDE 1.0 M21D24 fault codes: code 12 (intake air temp sensor) and code 14 (injection start sensor)

231 Engine Speed: 750 RPM

234 Boost Pressure Sensor: 285 hPa

232 ECU Power Supply Voltage #1: 14.2 V

206 Fuel Quantity Adjuster Potentiometer: 2666 mV

213 Accelerator Pedal Position Sensor: 470 mV

DDE 1.0 M21D24 live dаta: idle speed 750 RPM, boost pressure 285 hPa, voltage 14.2 V

223 Engine Temperature: 121 °C

224 Fuel Temperature: 41 °C

226 Cruise Control System Switch: 5 V

209 Vehicle Speed: 0 km/h

222 Automatic Transmission Regulating Contact: 5000 mV

DDE 1.0 M21D24 live dаta: engine temp 121°C, fuel temp 41°C, vehicle speed 0 km/h

205 ECU Power Supply #2: 13.7 V

204 Intake Air Temperature: -40 °C

203 Injection Start Sensor: 1.33 V

220 Actual Injection Start: 19.4° BTDC

230 Desired Injection Start: 3.3° BTDC

DDE 1.0 M21D24 live dаta: air temp -40°C, injection start sensor signal 1.33 V, injection angles 19.4° and 3.3° BTDC

105 Brake Light Test Switch: not activated

111 Brake Light Switch: not activated

DDE 1.0 M21D24 live dаta: brake light switch statuses not activated

112 Brake Pedal Position Sensor Switch: not activated

116 A/C Compressor Switch: not activated

127 Clutch Switch: not activated

DDE 1.0 M21D24 live dаta: brake, A/C, and clutch switch statuses not activated

151 Fuel Quantity Correction Value: 4

152 Idle Speed Correction Value: 3

DDE 1.0 M21D24 live dаta: fuel quantity correction value 4, idle speed correction value 3