ENGINE | 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) |
with CODE 494 (US version) | |
Bosch |
View of engine from rear left |
N3/9 | CDI control unit |
P07.16-3594-06
Location
The CDI control unit is on the air filter housing.
Task
The CDI control unit operates in an electrical network of sensors and actuators to form the engine timing system for engine 651.
The following systems and functions are controlled and coordinated by the CDI control unit according to input signals:
– fuel supply
- glow system control
- injection quantity control
– diagnosis and fault storage
– engine timing start stop function (with code (B03) ECO start/stop function)
- drive authorization system 4 (FBS 4) and immobilizer
– thermal management
– torque interface
– alternator interface
– exhaust gas recirculation
– exhaust treatment
The CDI control unit has an internal atmospheric pressure sensor.
Input and output signals
Input signals are evaluated by the engine timing output signals transmitted correspondingly:
Direct input signals
Direct output signals
LIN signals
CAN input signals
CAN output signals
Direct input signals
– circuit 15
- circuit 30 (fused)
– circuit 31
– circuit 87
– oil temperature sensor (B1)
– hot film MAF sensor (B2/5)
– intake air temperature sensor (B25b1)
– rail pressure sensor (B4/6)
– boost pressure sensor (B5/1)
– low-pressure turbocharger boost pressure sensor (B5/4)
– camshaft Hall sensor (B6/1)
– coolant temperature sensor (B11/4)
- exhaust gas recirculation temperature sensor (B16/14)
– charge air temperature sensor (B17/8)
- temperature sensor upstream of charge air cooler (B17/11)
– temperature sensor upstream of diesel particulate filter (B19/9) (with code (474) Particulate filter)
– temperature sensor upstream of turbocharger (B19/11)
– pressure sensor downstream of air filter (B28/5)
– DPF differential pressure sensor (B28/8) (with code (474) Particulate filter)
– accelerator pedal sensor (B37) - potentiometer 1
– accelerator pedal sensor - potentiometer 2
– fuel temperature sensor (B50)
– exhaust pressure sensor (B60)
– crankshaft Hall sensor (B70)
– fuel filter condensation sensor with heating element (B76/1)
- exhaust gas recirculation cooling bypass flap Hall sensor (B90)
– oxygen sensor sensor element upstream of catalytic converter (G3/2b1)
– internal combustion engine fan motor and A/C with integral regulation (M4/7), diagnostic data
– oil level check switch (S43)
Direct output signals
– oxygen sensor heater upstream of catalytic converter (G3/2r1)
– throttle valve actuator (M16/6)
– intake port shutoff actuator motor (M55)
– circuit 15 relay (N10/1kJ)
– circuit 50 relay, starter (N10/1kM)
– engine circuit 87 relay (N10/1kN)
– vent line heater element (R39/1)
– condensation sensor for fuel filter with heating element
– accelerator pedal sensor - reference masses for potentiometer 1 and 2
– combustion engine and air conditioning fan motor with integrated control - specified fan speed
– coolant pump switchover valve (Y133)
– oil spray nozzles shutoff valve (Y131)
- boost pressure control pressure transducer (Y31/5)
– boost pressure control flap pressure transducer (Y93)
– exhaust gas recirculation actuator (Y27/9)
– pressure regulating valve (Y74)
- switchable engine mount on the left (Y123) (for model 212.0/2 with 4MATIC)
- switchable engine mount on the right (Y123/1) (for model 212.0/2 with 4MATIC)
– cylinder 1 fuel injector (Y76/1)
– cylinder 2 fuel injector (Y76/2)
– cylinder 3 fuel injector (Y76/3)
– cylinder 4 fuel injector (Y76/4)
- exhaust gas recirculation cooler bypass switchover valve (Y85)
– quantity control valve (Y94)
– engine oil pump valve (Y130)
- fuel system control unit (N118) - fuel pump ground signal (M3) ON
LIN signals
– alternator interface via the drive LIN (LIN C1)
– alternator (G2)
– glow output stage (N14/3), controlling of various glow functions and transmission of system errors
- Fuel filter condensation sensor with heating element, Actuation of heating element and condensation sensor status
CAN input signals
Instrument cluster (A1)
- fuel reserve signal
Supplemental restraint system control unit (N2/10)
– crash signal
Fully integrated transmission control unit (Y3/8n4)
(with code (427) Automatic transmission 7-speed )
- gear range
- transmission mode
- actual gear engaged, target gear
– engine torque reduction request
- starter enable in selector lever position "P", "N"
- engine idle specified speed (for actuation of the torque converter lockup clutch)
- status of torque converter lockup clutch
– limp-home mode operation transmission control
Automatic air conditioning control and operating unit (N22/7)
– specified fan speed request
– A/C, status
Electronic Stability Program control unit (N30/4)
(except code (233) DISTRONIC PLUS) or,
Electronic Stability Program Premium control unit (N30/7) (with code (233) DISTRONIC PLUS)
– vehicle speed
– wheel speed signal
– brake recognition
– cruise control request
– engine torque request
– AIRmatic control unit (N51/3) (with code 489 (AIRmatic (air suspension with continuous variable damping)
– engine start request
– engine stop prohibition
- engine torque request (increasing or reducing)
Radar sensors control unit (N62/1) (with code (23P) Driving assistance package)
- engine torque request (increasing or reducing)
Left front door control unit (N69/1)
- driver door closed
Upper control panel control unit (N72/1)
– ECO start/stop function button status (N72/1s50)
Electronic ignition lock control unit (N73)
- start enable (drive authorization system)
Steering column tube module control unit (N80)
- steering wheel angle
- steering wheel angular velocity
Chassis gateway control unit (N93/7)
– engine torque request
Rear axle electronic level regulation control unit (N97) (except code (489) AIRmatic air suspension with continuous adjustment damping) (model 212.2)
– engine start request
– engine stop prohibition
Fuel system control unit (N118)
– fuel pressure
– self-diagnosis data
– requested diagnostic data
Nitrogen oxides control unit downstream of the diesel particulate filter (N37/7) (with code (U77) BLUETEC (SCR) diesel exhaust treatment)
– NOx concentration in exhaust
– O² concentration in exhaust
Nitrogen oxides control unit downstream of the SCR catalytic converter (N37/8) (with code (U77) BlueTEC (SCR) diesel exhaust treatment)
– NOx concentration in exhaust
– O² concentration in exhaust
AdBlue® control unit (N118/5) (with code (U77) BlueTEC (SCR) diesel exhaust treatment)
– quantity of reduction agent injected for NOx reduction
– quantity of reduction agent injected for cooling of the AdBlue® metering valve (Y129)
Soot particulate sensor control unit (N74) (with code (U77) BlueTEC (SCR) diesel exhaust treatment)
- soot particulate content, message
CAN output signals
Instrument cluster
– engine oil level too low
– circuit 61 signal (generated by CDI control unit)
– fuel consumption (the trip computer is informed about the current fuel consumption by means of square-wave pulse packages (1 pulse = 0.2 l/h))
Electronic ignition lock control unit
– start enable query (drive authorization system)
Fuel system control unit
– fuel pump ON
– fuel requirements
- diagnosis request
Fully integrated transmission control unit
(with code (427) Automatic transmission 7-speed )
Requests for catalytic converter heating
Switching request
- engine torque
- engine coolant temperature
– engine speed
- engine load
- kickdown
- engine speed limitation active
– limp-home mode engine timing
Nitrogen oxides control unit downstream of the diesel particulate filter (with code (U77) BlueTEC (SCR) diesel exhaust treatment)
- diagnosis request
Nitrogen oxides control unit downstream of the SCR catalytic converter (with code (U77) BlueTEC (SCR) diesel exhaust treatment)
- diagnosis request
AdBlue® control unit (with code (U77) BlueTEC (SCR) diesel exhaust treatment))
– request for reduction agent injection
– specification of the reduction agent quantity to be injected
– specification of the run-on period of the control units
- diagnosis request
Body
The housing of the CDI control unit is made of diecast aluminum and the cover is made of corrosion-proof sheet steel. The CDI control unit is water proof and dust proof.
The housing contains the 32-bit measuring and control electronics for the engine timing.
Ground connection
The "circuit 31" ground connection is made via multiple ground lines to the right assembly compartment ground point (W16/6).
Power supply
The CDI control unit is supplied with power by "circuit 30 fused" and, with the ignition on, by "circuit 87". In the operating voltage range it has both short-circuit protection and reversed polarity protection. Power is supplied through several connectors connected in parallel to relieve the electrical connections.
Information for partial function "no-load current shutoff" is documented in the function description "Engine OFF energy management function".
Variants
The engine timing variants (e.g. national and exhaust variants) are activated with Xentry Diagnostics using the variant coding function. Replacement of the CDI control unit is not necessary.
Assembly operations
Ensure before unplugging the connector on the CDI control unit that the ignition is switched off and processor run-on has ended. This is to prevent damage to the CDI control unit and save errors in the control units linked to the CAN.