Daewoo Matiz (2003 year). Manual - part 83

1F – 242  ENGINE CONTROLS

MAA1F280

DIAGNOSTIC TROUBLE CODE (DTC) – P0501 VEHICLE SPEED NO SIGNAL

(M/T ONLY)

Circuit Description

Vehicle speed information is provided to the engine con-
trol module (ECM) by the voltage speed sensor (VSS) is
a permanent magnet generator that is mounted in the
transaxle and produces a pulsing voltage whenever ve-
hicle speed is over 3 mph (5km/h). The A/C voltage level
and the number of pulses increase with vehicle speed.
The ECM converts the pulsing voltage into mph (km/h)
and than supplies the necessary signal to the instrument
panel for speedometer / odometer operation and to the
cruise control module and multi-function alarm module
operation. The Diagnostic Trouble Code (DTC) will de-
tect if vehicle speed is reasonable according to engine
rpm and load.

Conditions for Setting the DTC

D

Vehicle speed is not change at least 10 seconds.

D

Engine speed is greater than 2,100rpm.

D

MAF is greater than 152mg/tdc.

Action taken when The DTCs Sets

D

The Malfunction Indicator Lamp (MIL) will illuminate.

D

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.

D

A history DTC is stored.

Conditions for Clearing the MIL/DTC

D

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

D

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

D

Using the scan tool can clear DTC(s).

Diagnostic Aids

An Intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or wire that is
broken inside the insulation.

VSS signal circuit should be thoroughly checked for the
following conditions

D

Backed-out terminals

D

Improper mating

D

Broken locks

D

Improperly formed

D

Damaged terminals

D

Poor terminals to wire connection

D

Physical damage to the wiring harness

Ensure the VSS is correctly torqued to the trnasaxle
housing.

Refer to “intermittents” in this Section.

ENGINE CONTROLS  1F – 243

DTC P0501 – Vehicle Speed No Signal(M/T Only)

Step

Action

Value(s)

Yes

No

1

Perform an Euro On-Board Diagnostic (EOBD) Sys-
tem Check.
Is the system check complete?

–

Go to Step 2

Go to

“On-Board
Diagnostic

System Check”

2

Notice: Running the vehicle in gear with the wheels
hanging down at full travel will damage the drive
axles.
1. Turn the ignition ON, with the engine OFF.
2. Install a scan tool.
3. Raise the drive wheels.
4. Support the lower control arms so that the drive

axles are in a horizontal (straight) position.

5. Allow the engine to idle in gear.
Does the scan tool display vehicle speed above the
specified value?

0 mph

Go to Step 3

Go to Step 4

3

1. Turn the ignition ON, with the engine OFF.
2. Review the Freeze Frame data and note the

parameters.

3. Operate the vehicle within the Freeze Frame

conditions and Conditions for Setting this DTC.

Does the scan tool display the vehicle speed above
the specified value?

0 mph

Go to Step 12

Go to Step 4

4

1. Turn the ignition OFF.
2. Disconnect the engine control module(ECM)

connector.

4. using a digital voltmeter(DVM) connected to

ground, measure the voltage in the Vehicle Speed
Sensor (VSS) signal circuit, at terminal 1 while
rotating the wheels.

Is the voltage greater than or eqaul to specified

value?

0.5 v

Go to Step 12

Go to Step 5

5

Measure the resistant in the VSS signal circuit while
rotating the wheels.
Is the resistance greater than the specified value?

1950 

Ω

Go to Step 6

Go to Step 7

6

Check the VSS signal circuit for an open and repair
as necessary.
Is the repair complete?

–

Go to Step 12

Go to Step 9

7

Is the resistance value within or equal to the speci-
fied value?

1300–1950 

Ω

Go to Step 8

Go to Step 9

8

Check the VSS signal circuit for a short to ground or
for being shorted together and repair as necessary.
Is a repair necessary?

–

Go to Step 12

Go to Step 12

9

1. Remove the VSS.
2. Measure the resistance between terminals 2 and

3.

Is the resistance value within the specified value?

1300–1950 

Ω

Go to Step 11

Go to Step 10

10

Replace the VSS.
Is the action complete?

–

Go to Step 12

–

11

Replace the ECM.
Is the action complete?

–

Go to Step 12

–

1F – 244  ENGINE CONTROLS

DTC P0501 – Vehicle Speed No Signal(M/T Only) (Cont’d)

ÁÁÁÁ

ÁÁÁÁ

Step

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Action

ÁÁÁÁÁ

ÁÁÁÁÁ

Value(s)

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁ

Yes

ÁÁÁÁÁÁ

ÁÁÁÁÁÁ

No

12

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 the DTC as specifiec in the supporting
text.

Does the scan tool indicate that this diagnostic ran
and passed?

–

Go to Step 15

Go to Step 2

13

Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?

–

Go to

Applicable DTC

table

System OK

ENGINE CONTROLS  1F – 245

BLANK