2012 SSANGYONG RODIUS ECU

15-42
(13) PTC heater control
A. Overview
The supplementary electrical heater is installed in DI engine equipped vehicle as a basic equipment. The
PTC system is operated according to two temperature values measured at the coolant temperature
sensor and HFM sensor. This device is mounted in the heater air outlet and increase the temperature of
air to the passenger compartment. Because PTC system is heated by electrical power, high capacity
alternator is required. PTC does not operate during engine cranking, while the battery voltage is lower
than 11 V or during preheating process of glow plugs.
B. Components
HFM (intake air
temperature)
Coolant temperature
sensor
PTC relay 1
D20DTR ECU
PTC relay 2
PTC fuse 1, 2, 3, 40A
PTC heater
PTC Fuse and Relay

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C. PTC operation process
The PTC operating condition (ON) is controlled in two steps.
Basically, the engine ECU controls the relay to supply the power to PTC according to the coolant
temperature sensor and ambient temperature sensor.
1st step (initial operation of PTC) ▶
Coolant temperature < 15°C: PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fb00470058005c00b6006a006100470077007b006a00470076007500470088008d009b008c00990047009a0088009b0090009a008d00a00090009500
8e0047009b008f008c0047008a00960095008b0090009b0090>ons in 2nd step -
-
2nd step (coolant temperature ≥ 15°C) ▶
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fa0047005d005c00b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00990088009b00
9c0099008c004702fa004700540058005700b6006a00610047>PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004700630047005d005700a5005d005c00b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00
990088009b009c0099008c00470063004700540058005700a5>0°C: PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fa0047005d005700b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00990088009b00
9c0099008c004702fa0047005700a5005c00b6006a00610047>PTC ON -
-
-
Stop (OFF) conditions ▶
A/C blower switch OFF
Defective ambient air temperature sensor (including open or short circuit)
Engine cranking
Low battery voltage (below 11V)
During pre-glow process (glow indicator ON) -
-
-
-
-

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(14) Immobilizer control
A. Overview
The Immobilizer System provides an additional theft deterrent to the vehicle in which it is installed and
prevents it from being started by unauthorized persons. The transponder integrated in the key and the
engine control unit have the same code. When the ignition key with the integrated transponder is turned
to the ON position, the ECU (Engine Control Unit) checks the crypto code of the key and, if correct,
allows the vehicle to start the engine.
B. Components
Basic components (ignition key system) ▶
D20DTR ECUImmobilizer antennaIndicator/Warning Lamp
Start motorImmobilizer key

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C. Key approval process
When turning the ignition switch to ON position, the power is supplied to BCM and ECU. ECU
communicate with the immobilizer key to check if it is valid crypto code. If it is valid, ECU start to control
the engine when turning the ignition switch to START position. The system has 10 seconds of valid time-
out period. If the engine does not start in this period, the key approval process should be done again.

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(15) CDPF control
A. Overview
As the solution for environmental regulations and PM Particle Material) of diesel engine, the low emission
vehicle is getting popular. This vehicle is equipped with an extra filter to collect the soot and burn it again
so that the amount of PM in the exhaust gas passed through the DOC (Diesel Oxidation Catalyst) is
reduced. The CDPF (Catalyst & Diesel Particulate Filter) is an integrated filter including DOC (Diesel
Oxidation Catalyst) and DPF (Diesel Particulate Filter).
For details, refer to Chapter "CDPF".
B. Components
Oxygen sensorFront
EGT sensorCDPF
(DOC + DPF)Rear
EGT sensor
Differential pressure
sensorD20DTR ECUElectric throttle body

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Rear EGT sensor:
Measure DPF temp
Diff. pres. sensor:
Measure pressure
between front side and
rear side of CDPFElectronic throttle
body: Control intake
air mass
ECU (DCM 3.7)
Injector: Control post
injection
D. Operation process
When the differential pressure sensor detects the pressure difference between the front and the rear
side of CDPF, the sensor sends signal indicating the soot is accumulated and the post injection is
performed to raise the temperature of exhaust gas. The amount of fuel injected is determined according
to the temperature of exhaust gas detected by the rear temperature sensor. If the temperature is below
600°C, the amount of fuel injected is increased to raise the tem
perature. If the temperature is over
600°C, the amount of fuel injected is decreased or not controlled. When the engine is running in
low load range, the amount of post injection and the amount of intake air are controlled. It is to raise the
temperature by increasing the amount of fuel while decreasing the amount of intake air.
Front EGT sensor:
Measure DOC temp
T-MAP sensor
Intake air
mass
Exceed PM
limitBooster
pressure/
temperaturePost injection
Control intake
air mass

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2. CONFIGURATION
1) Circuit Diagram
The engine ECU detects the operating conditions of cruise control system, and monitors the
braking performance, vehicle speed, road conditions and ESP system operation. If the engine
ECU determines that there are not any problem to drive in cruise control mode, the vehicle can be
operated by cruise switch signals (decelerating, accelerating, cruising).

01-4
Make sure a connector is connected
securely. Loose connection results in
malfunction. -
When inspecting the airbag system, make
sure to use a diagnostic device, not a
circuit tester.When disconnecting a connector equipped
with a lock, press it down to the direction in
the below figure. -
When checking voltage or continuity of the
connector terminal with a circuit tester,
connect the tester probe to the terminal at
the harness side. For a sealed type
connector, connect the probe to the
terminal through the hole in the rubber cap
of the wiring. Take care not to damage the
insulation of the wires. Insert the probe until
it contacts the terminal completely. -