DTC 16

CIRCUIT DESCRIPTION:
This DTC concerns a loss of 2002 pulses per mile to the Powertrain Control Module (PCM) terminal "F13". This may be caused by loss of power to the VSS buffer or an open or grounded signal line.
Listed below are the conditions under which the DTC will set.
^ Less than 2 mph.
^ 1000 to 4400 RPM.
^ Throttle angle less than 2%.
^ ECT greater than 60° C.
^ MAP less than or equal to 25.6 kPa
^ CKT 1697/1716 open or grounded.
^ All conditions must be met for 3 seconds.

CHART TEST DESCRIPTION:
Numbers below refer to circled numbers on the diagnostic chart.
1. This tests for B+ at VSS buffer.
2. This tests for proper ground path for vehicle speed sensor signal buffer.
3. This tests for vehicle speed sensor signal buffer signal to PCM.
4. This test checks for faulty connections and a faulty VSS buffer.

DIAGNOSTIC AIDS:
Check connections at VSS buffer and PCM. Refer to Transmission Control Systems/4L60E Diagnostic Trouble Codes if DTC 24 or DTC 72 is also set.