P0722

Diagnostic Chart:

Wiring Diagram:

DTC P0722 indicates no vehicle speed signal pulses are present on circuit 400 at the PCM. Vehicle speed values are provided by the vehicle speed sensor (VSS). The sensor is a permanent magnet (PM) generator mounted on the differential area of the transaxle converter housing. The PM generator produces a pulsing voltage whenever vehicle speed is above 5 km/h (3 mph). These pulses occur 16 times per each revolution of the differential housing and are translated to provide vehicle speed in miles per hour. The km/h (mph) value read on the Scan tool TCM menu may very slightly from the ECM data or the speedometer.

DTC PARAMETERS

DTC P0722 is set when the PCM has detected the following conditions after starting from a stop.

^ No vehicle speed. Vehicle speed = zero.

^ Turbine speed above 1400 rpm.

^ Steady moderate throttle.

^ Speed ratio across the torque converter is greater than 700 rpm.

^ During a 1-2 upshift the turbine speed pulls down by a one to two ratio. This diagnostic commands TCC off during a 1 to 2 shift.

TEST DESCRIPTION

Numbered steps below refer to steps on trouble chart.

1. This step verifies the problem is still present.

2. This test indicates if problem is PCM or a wiring/sensor problem.

3. An open or shorted sensor will set DTC P0722. This test indicates if problem is a wiring problem or a faulty sensor.

4. An open, ground or a short to voltage in circuits 400 or 401 will cause DTC P0722 to set. This step indicates which circuit is faulty.

REPAIR VERIFICATION

Monitor DTC menu "Code Status" for "Pass Since Code Clear" and "Pass This Ignition Cycle." When both have passed, repair is verified.

Criteria for pass:

^ Output speed is greater than 21 kph for greater than 0.5 seconds.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool* to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

* Select MALF History and DTC status from DTC menu of Scan tool.

Check the tightness of the female terminal grip with a spare male terminal.

Check wire routing for possible chafed wires.