Component description for CDI control unit - GF07.16-P-6000SG
ENGINE 629 in MODEL 221.0/1 up to Model Year 8
Location
The CDI control unit is built into the engine compartment at the left in front of the windshield.
Task
The CDI control unit controls the following systems according to the input information:
- Fuel supply
- Control of the glow system during engine start and during driving mode
- Control of the injection quantities during engine start and during driving mode
- Emission control system
- Boost pressure control
- Shutoff of the coolant compressor (A9)
- Shut-off control
The CDI control unit reads in signals from the following components:
- Left hot film mass air flow sensor (B2/6)
- Intake air temperature sensor (B2/6b1)
- Right hot film mass air flow sensor (B2/7)
- Intake air temperature sensor (B2/7b1)
- Rail pressure sensor (B4/6)
- Charge pressure sensor (B5/1)
- Camshaft Hall sensor (B6/1)
- Coolant temperature sensor (B11/4)
- Charge air temperature sensor (B17/8)
- Left TWC exhaust gas temperature sensor (B16/4)
- Right TWC exhaust gas temperature sensor (B16/5)
- Temperature sensor upstream of left turbocharger (B16/9)
- Temperature sensor upstream of right turbocharger (B16/10)
- Pressure sensor downstream of air filter (B28/5)
- Left pressure differential sensor (DPF) (B28/12)
- Right pressure differential sensor (DPF) (B28/13)
- Accelerator pedal sensor (B37)
- Oil sensor (oil level, temperature and quality) (B40)
- Fuel temperature sensor (B50)
- Left exhaust back pressure sensor (B60/1)
- Right exhaust back pressure sensor (B60/2)
- Crankshaft Hall sensor (B70)
- Left O2 sensor upstream TWC [KAT] (G3/3)
- Right oxygen O2 sensor upstream of catalytic converter (G3/4)
There is also an internal atmosphere pressure sensor for altitude adjustment in the CDI control unit.
The CDI control unit actuates the following components:
- Throttle valve actuator (M16/6)
- Intake port shutoff motor (M55)
- Circuit 50 relay, starter (N10/1kH)
- Circuit 15 relay, starter (N10/1kJ)
- Fuel pump relay (N10/2kS)
- Charge air cooler circulation pump relay (N10/2kQ)
- Left exhaust gas recirculation positioner (Y27/9)
- Right exhaust gas recirculation positioner (Y27/10)
- Pressure regulator valve (Y74)
- Cylinder 1 fuel injector (Y76y1)
- Cylinder 2 fuel injector (Y76y2)
- Cylinder 3 fuel injector (Y76y3)
- Cylinder 4 fuel injector (Y76y4)
- Cylinder 5 fuel injector (Y76y5)
- Cylinder 6 fuel injector (Y76y6)
- Cylinder 7 fuel injector (Y76y7)
- Cylinder 8 fuel injector (Y76y8)
- Quantity control valve (Y94)
- Left boost pressure positioner (Y100)
- Right boost pressure regulator (Y100/1)
- EGR [AGR] cooler bypass flap switchover valve (Y85)
Communication via the drive LIN (LIN C1) takes place via the following components:
- Alternator (G2)
- Glow output stage (N14/3), control of various glow functions and transmission of system faults
The CDI control unit communicates with the instrument cluster via the central CAN (A1). Production of error messages takes place via the multifunction display (A1p13) and the CDI control unit initiates, as required, actuation of the engine diagnosis indicator lamp (A1e58).
The CDI control unit communicates with the following components via the vehicle dynamics CAN:
- ESP control unit (N47-5)
- EIS [EZS] control unit (N73)
- Steering column module (N80), cruise control control over the CC [TPM] switch (S40/4)
- Central gateway control unit (N93)
The CDI control unit communicates with the fully integrated transmission control (VGS) control unit (Y3/8n4) via the drive train CAN.
The CDI control unit is equipped with a fault memory, which can be read out via STAR DIAGNOSIS.