SsangYong Musso. Manual - part 136

1F-128  ENGINE CONTROLS

SSANGYONG  Y158

12

Step

Action

Value(s)

Yes

No

13

1. Using the scan tool, clear the Diagnostic Trouble

Codes (DTCs).

2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for setting

this DTC as specified in the supporting text.

Does the scan tool indicate that this diagnostic ran and
passed?
Check if any DTCs are set.
Are any DTCs displayed that have not been diagnosed?

DTC P0118 Engine Coolant Temperature High Voltage (Cont'd)

-

 Go to Step 13

 Go to Step 2

-

Go to

applicable

DTC table

System OK

ENGINE CONTROLS  1F-129

SSANGYONG  Y158

BLANK

1F-130  ENGINE CONTROLS

SSANGYONG  Y158

Circuit Description

The Engine Control Module (ECM) supplies a 5 volt ref
erence signal and a ground to the Throttle Position (TP)
sensor. The TP sensor sends a voltage signal back to
the ECM relative to the throttle plate opening. The volt-
age signal will vary from approximately 0.3 ~ 0.9 volts
at closed throttle, to over 4.0 ~ 4.6 volts at Wide Open
Throttle (WOT).

The TP sensors serve for engine load control according
to the drive pedal command. Load adjustments indepen-
dent of  the drive pedal command can be implemented;
such functions are, for instance, idle control, speed con-
trol, drive slip control, load shock damping, and similar
functions.

When the actuator current fails, the throttle valve is re-
turned to  emergency operating position by a spring. The
throttle valve position, and thereby the actuator drive
position checkback is provided by two potentiometers.
The motor positions the throttle valve against the return
spring force. Motor and return spring are two separate
energy sources. Each of them is able to position the
throttle valve in emergency position alone. Throttle valve
position checkback and monitoring is provided by two
actual value potentiometers connected to the engine
control electronics.

DIAGNOSTIC TROUBLE CODE (DTC) P0120

THROTTLE POSITION SENSORS ERROR

Conditions for Setting the DTC

•••••

Ignition ON.

•••••

Electrical system protection is not active.

Action Taken When the DTC Sets

•••••

The Malfunction Indicator Lamp (MIL) will illuminate
after two consecutive driving cycles in which the diag-
nostic runs with the fault active.

•••••

The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.

•••••

A history DTC is stored.

Conditions for Clearing the MIL/DTC

•••••

The MIL will turn off after three consecutive driving
cycles in which the diagnostic runs without a fault.

•••••

A history DTC will clear after 40 consecutive warm-
up cycles without a fault.

•••••

DTC(s) can be cleared using the scan tool.

YAA1F560

ENGINE CONTROLS  1F-131

SSANGYONG  Y158

Diagnostic Aids

The throttle actuator includes two potentiometers which
are supplied from the ECU. All signals are calculated
as voltage ratio (signal voltage divided by supply voltage).
This function is diagnosed continuously during ignition
on. In the following situations a fault is detected and the
system is switched to the mode of reduced operating
range:

•••••

voltage ratio of sensor 1 out of limits

•••••

voltage ratio of sensor 2 out of limits

•••••

supply voltage out of limits

•••••

voltage ratio of sensor 1 is not plausible to voltage
ratio of sensor 2

If one sensor signal is not plausible to the other one the
defective sensor is detected by checking engine speed
and air mass.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Table.

1. The Euro On-Board Diagnostic (EOBD) System

Check  prompts the technician to complete some

basic checks and store the freeze frame and failure
records  data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfuction occurred. The information is then
stored on the scan tool for later reference.

5. If DTC P0120 cannot be duplicated, the information

included in the Freeze Frame/Failure Records data
can be useful. Use the scan tool DTC information
data to determine the status of the DTC.

11. If additional DTCs are set, check the 5 reference

circuits for a short the ground.

13. If additional DTCs are set, check the 5 reference

circuits for a short the ground.

15. If the test light illuminates while probing the TP sig-

nal circuit, then the TP signal circuit is shorted to
ground.

21. The replacement ECM must be reprogrammed. Re-

fer to  the latest Techline procedure for ECM repro-
gramming.

23. If no faults have been found at this point and no

additional DTCs were set, refer to “Diagnostic Aids”
in this section for additional checks and information.

1

Step

Action

Value(s)

Yes

No

DTC P0120 Throttle Position Sensor Error

2

3

4

1. Perform an Euro On-Board Diagnostic (EOBD)

System Check.

Is the system check complete?

1. Turn the ignition switch ON, with the engine OFF.
2. Install a scan tool.
3. Select the Throttle Position (TP) angle parameter on

the scan tool.

4.  Monitor the scan tool while pressing the accelerator

pedal to the floor and then slowly releasing the
pedal. (Repeat the procedure several times.)

Does the TP angle value increase steadily when the
accelerator pedal is pressed to greater than the
specified value and decrease steadily when the pedal is
released to less than the specified value?
Does the scan tool display a throttle position (TP)
sensor 1 voltage between the specified value when the
throttle is fully closed?
Does the scan tool display a throttle position (TP)
sensor 2 voltage between the specified value when the
throttle is fully closed?
1. Review the Freeze Frame data and note the

parameters.

2. Operate the vehicle within the Freeze Frame

conditions and Conditions for Setting The DTC as
noted.

Is the DTC P120 set again?

5

-

 Go to Step 6

 Go to Step 22

4.0 - 4.6 v

 Go to Step 5

Go to Step 6

0.3 - 0.9 v

 Go to Step 4

Go to Step 6

98 %

1 %

 Go to Step 3

 Go to Step 5

-

 Go to Step 2

Go to “Euro

On-Board

Diagnostic

System Check”