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Page Title:
Test Step 4. Inspect the Speedometer Calibration |
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 429
TM 9-2320-312-24-2
Troubleshooting Section
N This symbol represents the number of
chopper teeth on the transmission drive shaft.
The magnetic pickup sensor is mounted here.
The number of chopper teeth is usually 16. Some
transmissions have 11 tooth chopper wheels.
B. Use ET to enter pulses per km (PPKM) or pulses
per mile (PPM) into the ECM.
Expected Result:
This value is within the valid range of the ECM.
Results:
OK Once the value is entered, verify that the
ECM is accurately measuring vehicle speed.
Proceed to Test Step 4.
Not OK Recalculate the value and re-enter the
correct value into the ECM. STOP.
Test Step 4. Inspect the Speedometer
Determine the speedometer's vehicle speed
calibration setting. You may be required to contact
the OEM dealer or you may be required to send the
vehicle to the OEM dealer for this information.
Expected Result:
The speedometer must be calibrated to one of the
following values:
For "Other Truck Manufacturer" configurations,
the value is 18,600 pulses per kilometer (30,000
pulses per mile).
For "GM Truck Manufacturer" configurations that
have SEP00 or newer software, the value is 2,485
pulses per kilometers (4,000 pulses per mile).
The ECM can only provide the signal that is listed
above.
Results:
OK The speedometer is correctly calibrated.
STOP.
Not OK
Repair: Perform the following diagnostic
procedure:
Send the vehicle to the OEM dealer or reprogram
the OEM speedometer to the correct setting for
the pulses per kilometer (mile).
STOP.
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