The ECU is the core/brain of an automobile...its control domain spans from the power-train to auxiliary functions such as parking assist & lighting.

1. ECU/EMS

3. OPERATION PARAMETERS
Power/Mech.
Efficiency
Thermal
Eff/Ht. Balance
Exhaust
Smoke
A/F Ratio
Specific Fuel
Consumptn
Effective Pr’
Volumetric
Efficiency
Specific O/P
Torque

4. EMS SCHEMATIC
Sensor
I/P
ECU
Stage
Actuator
O/P

5. MAF
Crankshaft position
Oxygen
VR Tacho
Throttle Position
Knock Sensor
Engine RPM
Intake Air TEMP
Transmission fluid
temp
Brake force meter
Tire Pressure
TSS-Turbo Speed
Engine Coolant Temp
TERTIARY
MAP
SECONDARY
PRIMARY
SENSOR LIST
Blind-Spot
Parking
Speed
Door Closure
Proximity
Curb Sensor
NEUTRAL START
Stop Light
A/C Compressor
Relay
Head Light

6. CONTROL SYSTEMS
STAGE I
STAGE II
STAGE III
• Mechanical Design Solution
• Non-adaptive
• Hardwired Chip
• Application Specific
• Non Programmable
• Common base hardware
• Programmable

7. Standard ECU Systems
Airbag Control
Module
BCU/ABS/ESC
TCU
Body Control
Module
HMI
DCU
PSCU-Steering
Power train
Control
Module(PCM)

8. Power-train Control Module
[PCM]
 SENSOR INPUTS:
 MAF/MAP- Intake air
density
 VR TACHO- Engine RPM
 CR POS- Crankshaft
Angle
 IDLE SET-Idle Speed
 THROTTLE POS
 KNOCK
 TRANSMISSION ECU
 CONTROL OUTPUT:
 A/F Ratio- Inj. Timing/Pr
 Ig. Timing
 Idle Speed Set
 VVT
 Transient Fueling
 Gear Control Ig. Cutoff
 Rev Limit
 Turbo Waste-gate limit

9. ADVANTAGES
 Ease of Control
 Adaptable to multiple scenarios
 Very low cost compared to mechanical systems
 Occupy lesser space-compact engine bay
 Less complicated design
 Zero wear

10. UNIQUE FEATURES
 SERVICE SETTING:
 List of service
parameters
 Range of acceptable
values OR time limits
(modifiable)
 Service Indicator Light
 Program reset
 OBD On Board Diagnostics
 Self detection of possible
faults
 Sensor scanning
subsystems
 Fault codes stored in ECU
memory
 All cars after 1996 OBD-II
compliant

15. AUTO TUNING
 Software on ECU known as a map
 New maps can be loaded to ECU [ process known as re-
mapping or flashing]
 Complete access to parameters such as fuel injection
quantity, boost pressure, ignition timing, idle speed
setting
 No costly equipment required, laptop, Tuner EMS s/w &
ODB cable
 Plug & play ECU’s with multiple maps available.