Circuit Description
Speed signal noise is an irregularity in the normal stream of turbine shaft
speed sensor signal pulses. There are 3 conditions that are identified as noise:
| • | Missing pulses in a revolution of the turbine shaft |
| • | Extra pulses in a revolution of the turbine shaft, the time between pulses
is too long in comparison to engine speed |
Conditions for Setting the DTC
DTC P0716 is set when the PCM has detected the following conditions for more
than 70 milliseconds, twice per ignition cycle:
| • | Turbine shaft speed noise parameter status equals YES. |
| • | Turbine shaft speed is greater than 1,400 RPM. |
| • | Noise is present for 0.7 seconds. |
Test Description
Numbered steps below refer to numbered steps on the chart.
- This test checks the PCM connector for an open, spread or corroded terminals,
or loose wires.
- This test checks turbine shaft speed (TSS) sensor connector for an open,
spread, corroded terminals, or loose wires.
- This test checks the PCM for internal intermittent faults.
- This step is a visual inspection of the TSS sensor connector and the PCM
connector to check for an open or spread or corroded terminals.
- This step checks for secondary ignition wires routed close to TSS sensor
circuits 1230 and 1231 and lists other potential causes.
Repair Verification
Monitor the DTC menu Code Status for Pass Since Code Clear and Pass This Ignition
Cycle. When both have passed, the repair is verified.
Criteria for pass:
| • | Noise not present for 0.5 seconds |
Diagnostic Aids
Check the wire routing for possible chafed wires.
