SsangYong Rodius (2013 year). Manual - part 93

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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
Coolant temperature ≥ 15°C: PTC ON after satisfying the conditions in 2nd step

-

-

2nd step (coolant temperature ≥ 15°C)

▶

Coolant temperature ≤ 65°C and intake air temperature ≤ -10°C: PTC ON
Coolant temperature < 60~65°C and intake air temperature < -10~0°C: PTC ON
Coolant temperature ≤ 60°C and intake air temperature ≤ 0~5°C: 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 ECU

Immobilizer antenna

Indicator/Warning Lamp

Start motor

Immobilizer 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 sensor

Front 

EGT sensor

CDPF

 (DOC + DPF)

Rear 

EGT sensor

Differential pressure 

sensor

D20DTR ECU

Electric throttle body