DTC 16

DTC 16 VSS Buffer Chart:

DTC 16 VSS Buffer Circuit:

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.

DTC 16 WILL SET WHEN:
^ Less than 2 mph.
^ 1000 to 4400 RPM.
^ Throttle angle less than 2%.
^ ECT greater than 60° C.
^ MAP less than or equal to 28 kPa.
^ CKT 1716 open or grounded.
^ All conditions must be met for 3 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO):
None.

DTC 16 WILL CLEAR WHEN:
Conditions for fault are no longer present and TECH 1 scan tool "clear DTCs" function is used or 50 ignition switch keycycles have passed with no further faults or ignition switch is turned "OFF" and ECM "B" fuse is removed for 10 seconds.

DTC CHART TEST DESCRIPTION:
Number(s) below refer to circled number(s) 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 4L60E Transmission Diagnosis if DTC 24 or DTC 72 is also set.