ENGINE CONTROLS 1F–243
DAEWOO M-150 BL2
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
–
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