Powertrain Controls - ECM/PCM

DTC 71 Camshaft Position Sensor Circuit Low:

Camshaft Position Sensor Circuit:

CIRCUIT DESCRIPTION
The camshaft position sensor detects the rotational speed of the camshaft. As the camshaft rotates, an AC signal is generated in the circuit. This signal provides the input to determine engine speed, for use in various calculations including Torque Converter Clutch (TCC) slip speed and overdrive ratio.

DTC 71 WILL SET WHEN
^ No DTC 28 set.
^ Engine speed less than 50 RPM.
^ Trans range indicates R, D4, D3, or D1.
^ Conditions are met for 2 seconds.

ACTION TAKEN (TCM will default to)
Inhibit TCC.

DTC 71 WILL CLEAR WHEN
Fault condition(s) no longer exist.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. An out of range trans range pressure switch could falsely indicate the actual transmission range.
2. This checks the entire Camshaft Position (CMP) sensor circuit for proper signal.
3. A signal at this point indicates that the sensor is capable of inducing an AC voltage in the circuit.

DIAGNOSTIC AIDS
A mechanical problem with the camshaft, may set this code. With CMP sensor removed, check camshaft for damage.
Refer to Intermittents. - Intermittent Malfunctions