Component Description For CDI Control Unit - GF07.16-P-6000OLG
ENGINE 651.9 up to 2/28/13 in MODEL 166
View of engine from rear left
Location
The CDI control unit is on the air filter housing.
Tasks
The CDI control unit performs the following tasks:
- Controlling the basic engine functions
- Reading in of signals
- Evaluation of input factors
- Output of signals and actuation of components
The CDI control unit also acts as the interface (gateway) between the three connected CAN bus systems.
Controlling the basic engine functions
- Fuel supply
- Glow system
- Injection quantity control
- Electronic accelerator
- Diagnosis and fault storage
- Drive authorization system and immobilizer
- Thermal management
- Exhaust gas recirculation
- Exhaust treatment
- Torque coordination
- Engine management Start-Stop function
Reading in of signals
Input factors are read in by means of the following connections:
- Direct line
- Drive-LIN (LIN C1)
- Drive train CAN (CAN C)
- Chassis CAN 1 (CAN E1)
- Drive train sensor CAN (CAN I)
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.
Output of signals and actuation of components
Initial parameter are output over the following connections:
- Direct line
- Drive train LIN
- Drive train CAN
- Chassis CAN 1
- Drive train sensor CAN
The electronic ignition lock control unit (N73) is the central interface (Gateway) for exchange of function-relevant data for control units which are connected to the various Control Area Network (CAN) bus systems.
Input factors and initial parameters for the following components are read in or output over direct lines by the CDI control unit and are needed by the engine management:
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Terminal 15 | - | - |
| Circuit 30 (fused) | - | - |
| Circuit 31 | - | - |
| Terminal 87 | - | - |
| Knock sensor 1 (A16/1) | - | - |
| Knock sensor 2 (A16/2) | - | - |
| Engine oil temperature sensor (B1) | - | - |
| Hot film mass air flow sensor (B2/5) | - | - |
| Intake air temperature sensor (B2/5b1) | - | - |
| High pressure fuel pressure sensor (B4/6) | - | Fuel high-pressure circuit |
| Boost pressure sensor (B5/1) | - | - |
| Low-pressure turbocharger boost pressure sensor (B5/4) | - | - |
| Camshaft Hall sensor (B6/1) | - | - |
| Coolant temperature sensor (B11/4) | - | - |
| Temperature sensor upstream of SCR catalytic converter (B16/15) | - | With CODE U42 (BlueTEC (SCR) diesel exhaust treatment) |
| Charge air temperature sensor (B17/8) | - | - |
| Temperature sensor upstream of catalytic converter (B19/7) | - | With CODE U42 (BlueTEC (SCR) diesel exhaust treatment) |
| 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) | Accelerator pedal sensor (B37) | - |
| Fuel temperature sensor (B50) | - | - |
| Exhaust pressure sensor (B60) | - | - |
| Crankshaft Hall sensor (B70) | - | - |
| Exhaust gas recirculation cooling bypass flap Hall sensor (B90) | - | With code U42 (BLUETEC (SCR) diesel exhaust treatment) and CODE 494 (USA version) |
| Intake port shutoff Hall sensor (B96) | - | With code U42 (BLUETEC (SCR) diesel exhaust treatment) and CODE 494 (USA version) |
| - | Starter circuit 50 relay (F58kM) | - |
| Circuit relay 87M (F58kN) | Circuit relay 87M (F58kN) | - |
| - | Circuit relay 15 (F58kR) | - |
| Oxygen sensor upstream of catalytic converter (G3/2) | Oxygen sensor upstream of catalytic converter (G3/2) | - |
| Fan motor (M4/7) | Fan motor (M4/7) | - |
| Throttle valve actuator (M16/6) | Throttle valve actuator (M16/6) | - |
| - | Intake port shutoff actuator motor (M55) | - |
| Supplemental restraint system control unit (N2/10) | - | - |
| - | Fuel system control unit (N118) | - |
| - | Vent line heater element (R39/1) | - |
| - | Coolant thermostat heating element (R48) | Except CODE 494 (USA version) |
| Oil level check switch (S43) | - | - |
| - | Exhaust gas recirculation actuator (Y27/9) | - |
| - | Boost pressure control pressure transducer (Y31/5) | - |
| - | Pressure regulating valve (Y74) | - |
| - | Cylinder 1 fuel injector (Y76/1) | - |
| - | Cylinder 2 fuel injector (Y76/2) | - |
| - | Cylinder 3 fuel injector (Y76/3) | - |
| - | Cylinder 4 fuel injector (Y76/4) | - |
| - | Radiator shutters actuator (Y84) except code 550 (Trailer hitch) | - |
| - | Exhaust gas recirculation cooler bypass switchover valve (Y85) | - |
| - | Boost pressure control flap pressure transducer (Y93) | - |
| - | Quantity control valve (Y94) | - |
| - | Left switchable engine mount (Y123) and right switchable engine mount (Y123/1) | - |
| - | Engine oil pump valve (Y130) | - |
| - | Oil spray nozzle shutoff valve (Y131) | - |
| - | Coolant pump switchover valve (Y133) | - |
Input and initial parameters for the following components and control units are transmitted or received by the CDI control unit via the LIN or CAN and are needed by the engine management system:
| Input factors via the drive train LIN (LIN C1) | Initial parameters via the drive train LIN (LIN C1) | Supplemental information |
|---|---|---|
| Alternator (G2) | Alternator (G2) | - |
| Glow output stage (N14/3) | Glow output stage (N14/3) | - |
| Input factors via drive train CAN (CAN C) | Initial parameters via drive train CAN (CAN C) | Supplemental information |
|---|---|---|
| Fuel system control unit (N118) | Fuel system control unit (N118) | - |
| Fully integrated transmission control unit (Y3/8n4) | Fully integrated transmission control unit (Y3/8n4) | - |
| Input factors via chassis CAN 1 (CAN E1) | Initial parameters via chassis CAN 1 (CAN E1) | Supplemental information |
|---|---|---|
| Instrument cluster (A1) | Instrument cluster (A1) | Via chassis CAN 2 (CAN E2) and the electronic ignition lock control unit (N73) |
| Supplemental restraint system control unit (N2/10) | - | - |
| SAM control unit (N10) | - | Via interior CAN (CAN B) and the electronic ignition lock control unit (N73) |
| Automatic air conditioning control and operating unit (N22/7) | - | Via interior CAN (CAN B) and the electronic ignition lock control unit (N73) |
| Electronic Stability Program control unit (N30/4) | - | - |
| AIRmatic control unit (N51/3) | - | - |
| Video and radar sensor system control unit (N62/2) | - | - |
| Left front door control unit (N69/1) | - | Via interior CAN (CAN B) and the electronic ignition lock control unit (N73) |
| Upper control panel control unit (N72/1) | - | Over the battery sensor LINE (LINE B15) to SAM control unit (N10) and via interior CAN (CAN B) and electronic ignition lock control unit (N73) |
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Steering column tube module control unit (N80) | - | - |
| Diagnostic connector (X11/4) | Diagnostic connector (X11/4) | Via diagnostic CAN (CAN D) and the electronic ignition lock control unit (N73) |
| Input factors via drive train sensor CAN (CAN I) | Initial parameters via drive train sensor CAN (CAN I) | Supplemental information |
|---|---|---|
| NOx sensor control unit downstream of diesel particulate filter (N37/7) | NOx sensor control unit downstream of diesel particulate filter (N37/7) | With CODE U42 (BlueTEC (SCR) diesel exhaust treatment) |
| NOx sensor control unit downstream of SCR catalytic converter (N37/8) | NOx sensor control unit downstream of SCR catalytic converter (N37/8) | With CODE U42 (BlueTEC (SCR) diesel exhaust treatment) |
| AdBlue® control unit (N118/5) | AdBlue® control unit (N118/5) | With CODE U42 (BlueTEC (SCR) diesel exhaust treatment) |
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 inside contains the 32-bit measuring and control electronics for the engine management.
The CDI control unit has an internal atmospheric pressure sensor.
Ground connection
The ground connection "circuit 31" is made over a number of ground lines to the front right ground point for lamp unit (W2).
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 engaged parallel pins connected in parallel to relieve the electrical connections.
Variants
The variants of the engine management, for exampled country and exhaust variants, are activated with XD over the variant coding.
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.
| Wiring diagram for common rail diesel injection (CDI) control unit | N3/9, engine-side, sheet 1 | PE07.16-P-2101-97NAC | |
| N3/9, engine-side, sheet 2 | PE07.16-P-2101-97NAH | ||
| N3/9, body-side | PE07.16-P-2101-97NAD |