Powertrain Controls - ECM/PCM

Transmission Input Speed (TIS) Sensor Circuit:

CIRCUIT DESCRIPTION
The Transmission Input Sensor (TIS) sensor consists of a permanent magnet surrounded by a coil of wire. As the forward clutch housing rotates, an AC voltage is induced in the circuit. The signal voltage and frequency vary directly with the forward clutch rotational speed.

DTC 74 WILL SET WHEN
- No DTC(s) 24, 28, or 71.
- Trans range not in park or neutral.
- Engine speed greater than 300 RPM.
- Trans output speed greater than 200 RPM.
- Trans input speed less than 50 RPM.
- All conditions met for 2 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
No Torque Converter Clutch (TCC) operation.

DTC 74 WILL CLEAR WHEN
The fault condition(s) no longer exist.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This checks the entire circuit for continuity.
2. This checks the output of the input speed sensor.

DIAGNOSTIC AIDS
Refer to PCM Intermittant DTC's or Performance. Testing and Inspection