Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSON-BOARD COMPUTER IV - ADDITIONAL FUNCTIONSLANGUAGE
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Language
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Language
The OBC language is now changed whenever the Check Control language is changed. A total of six languages can be chosen in this order: English U.S., German, English U.K., French, Italian and Spanish.
Language change
To change languages follow this procedure:
1. Turn ignition key to position 1.
2. Hold CC button down until the next language appears (approx. 10 seconds). Release button.
3. Repeat this process until the desired language appears.
The newly selected language will be stored unless battery voltage is taken away from the CCM.
In this event the primary language, ENGLISH U.S., as programmed in the coding plug of the instrument cluster, will re-appear when battery voltage is restored.
UNITS OF MEASUREMENT CHANGE
By pressing the changeover button the displays will change from U.S. standards to metric units. Pressing the button again will bring back the U.S. standards. This can be helpful when traveling outside the United States in a country that uses the metric system of measurements.
OBC INPUTS AND DISPLAYS
HR/DATE (hour/date)
Pushing this button repeatedly displays the time and date alternately. Leap years are now accounted for, eliminating resetting on those occasions.
Changes may be made to the time display when the HR function is selected by pushing the numeric buttons. This new time is not accepted until the S/R button is pushed. The original time will be retained unless the S/R button is pushed. The same applies to the date function.
An hourly reminder of 3 soundings of the chime may be selected or deactivated by selecting the HR function and the S/R button. A "sound" symbol will be displayed on the OBC when this has been selected.
TEMP (temperature display)
A PTC resistor-type sensor supplies a signal to the OBC module. Display range is from - 22~F to + 122~F. A gong is sounded when the temperature drops below + 37~F. The display also flashes for a period of 8 seconds. The gong is triggered again when reaching + 37~F if the temperature rose above + 42~F since the chime sounded.
The sensor is located next to the right front fog light. Input from the sensor is not accepted by the OBC module with the car at a standstill.
If the sensor should fail the display will read a constant - 22~F.
Distance pulse sensor (vehicle speed input)
Signal comes from the speed sensor located in the rear differential housing via the electronic speedometer.
AVG MPG (fuel consumption)
Average fuel consumption is calculated by comparing a voltage signal received from the Motronic ECU against the load speed signal. The voltage signal from the Motronic ECU varies upon the opening time of the fuel injectors.
OBC IV allows the customer to monitor two separate fuel consumption periods. This is done by pressing the AVG MPG button. The display will alternate between AVG MPG 1 and AVG MPG 2.
To reset, select the appropriate AVG MPG mode and press the S/R (set/reset) button.
A customer may find this beneficial on a trip to 1) monitor fuel consumption of the entire trip and 2) using the second AVG MPG function to monitor fuel consumption per tankful.
Fuel Tank Level
A variable resistor sends a signal to the OBC module according to the fuel level in the tank.
The module needs no calibration for level (as on OBC II) due to the fuel tank information on the coding plug.
A separate low fuel level warning light contact is provided and is separate from the variable resistor.
AVG MPH (average speed)
This function gives the average speed from the last time the S/R button was pressed while in this function. A new average is calculated when pushing the S/R button after the AVG MPH button has been selected.
M MPH (speed limit warning)
This function allows the driver to be informed by a chime and flashing LED that the programmed speed selected has been exceeded.
To select a speed at which this warning is sounded simply input it using the numeric buttons while in this mode. If the speed the vehicle is traveling is also the speed at which the warning is to be given, push the M MPH button followed by the SIR button.
The chime also sounds if the vehicle speed drops 3 mph below the programmed speed.
Language change
To change languages follow this procedure:
1. Turn ignition key to position 1.
2. Hold CC button down until the next language appears (approx. 10 seconds). Release button.
3. Repeat this process until the desired language appears.
The newly selected language will be stored unless battery voltage is taken away from the CCM.
In this event the primary language, ENGLISH U.S., as programmed in the coding plug of the instrument cluster, will re-appear when battery voltage is restored.
UNITS OF MEASUREMENT CHANGE
By pressing the changeover button the displays will change from U.S. standards to metric units. Pressing the button again will bring back the U.S. standards. This can be helpful when traveling outside the United States in a country that uses the metric system of measurements.
OBC INPUTS AND DISPLAYS
HR/DATE (hour/date)
Pushing this button repeatedly displays the time and date alternately. Leap years are now accounted for, eliminating resetting on those occasions.
Changes may be made to the time display when the HR function is selected by pushing the numeric buttons. This new time is not accepted until the S/R button is pushed. The original time will be retained unless the S/R button is pushed. The same applies to the date function.
An hourly reminder of 3 soundings of the chime may be selected or deactivated by selecting the HR function and the S/R button. A "sound" symbol will be displayed on the OBC when this has been selected.
TEMP (temperature display)
A PTC resistor-type sensor supplies a signal to the OBC module. Display range is from - 22~F to + 122~F. A gong is sounded when the temperature drops below + 37~F. The display also flashes for a period of 8 seconds. The gong is triggered again when reaching + 37~F if the temperature rose above + 42~F since the chime sounded.
The sensor is located next to the right front fog light. Input from the sensor is not accepted by the OBC module with the car at a standstill.
If the sensor should fail the display will read a constant - 22~F.
Distance pulse sensor (vehicle speed input)
Signal comes from the speed sensor located in the rear differential housing via the electronic speedometer.
AVG MPG (fuel consumption)
Average fuel consumption is calculated by comparing a voltage signal received from the Motronic ECU against the load speed signal. The voltage signal from the Motronic ECU varies upon the opening time of the fuel injectors.
OBC IV allows the customer to monitor two separate fuel consumption periods. This is done by pressing the AVG MPG button. The display will alternate between AVG MPG 1 and AVG MPG 2.
To reset, select the appropriate AVG MPG mode and press the S/R (set/reset) button.
A customer may find this beneficial on a trip to 1) monitor fuel consumption of the entire trip and 2) using the second AVG MPG function to monitor fuel consumption per tankful.
Fuel Tank Level
A variable resistor sends a signal to the OBC module according to the fuel level in the tank.
The module needs no calibration for level (as on OBC II) due to the fuel tank information on the coding plug.
A separate low fuel level warning light contact is provided and is separate from the variable resistor.
AVG MPH (average speed)
This function gives the average speed from the last time the S/R button was pressed while in this function. A new average is calculated when pushing the S/R button after the AVG MPH button has been selected.
M MPH (speed limit warning)
This function allows the driver to be informed by a chime and flashing LED that the programmed speed selected has been exceeded.
To select a speed at which this warning is sounded simply input it using the numeric buttons while in this mode. If the speed the vehicle is traveling is also the speed at which the warning is to be given, push the M MPH button followed by the SIR button.
The chime also sounds if the vehicle speed drops 3 mph below the programmed speed.
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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.