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.
1987 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE
BOSCH Cis-E System
- Description
- Operation
- On-Board Diagnostic Readout System
- Fuel Pump Relay
- Cold Start Valve Activation
- Fuel Enrichment
- Fuel Pump
- Diaphragm Pressure Regulator
- Fuel Distributor Unit (FDU)
- Coolant Temperature Sensor
- Electronic Control Unit (Ecu)
- Idle Speed Control Unit
- Voltage Protection Relay (VPR)
- Oxygen Sensor
- Lambda Control
- EZL Ignition Operation
- Trouble Shooting
- Diagnostic Testing - 420 & 560 Series
- Test 1 - Voltage Supply To Cis-E Control Unit
- Test 2 - Airflow Sensor Position Indicator
- Test 3 - Full Load Contact & Airflow Sensor Position Indicator
- Test 4 - Coolant Temperature Sensor
- Test 5 - Airflow Sensor POISITION Indicator
- Test 6 - Oxygen Sensor
- Test 7 - TD Signal
- Test 8 - Altitude Correction Capsule
- Test 9 - On-Off Ratio
- EZL Ignition Testing
- Component Testing
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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.