P1710

DTC P1710 Back-Up Signal For Speed Sensor Circuit (1 Of 2):

DTC P1710 Back-Up Signal For Speed Sensor Circuit (2 Of 2):

Back-Up Signal Circuit:

CIRCUIT DESCRIPTION

The Transmission Control Module (TCM) receives an AC voltage input from the Vehicle Speed Sensor (VSS) (Transmission) whenever the drive wheels are rotating. Because the frequency of the AC signal increases with wheel speed, the TCM can calculate vehicle speed from the frequency of the AC signal. The TCM uses this information to determine shift points.

The VSS (Speedometer) serves as a backup to the VSS (Transmission). If the transmission one fails, then the TCM uses the VSS (Speedometer) information to calculate vehicle speed.


DTC DETECTING CONDITIONS

With 4L switch open, no VSS (Speedometer) signal is received while 10 pulses of the VSS (Transmission) signal are received and this occurred 500 times continuously. Two driving cycle detection logic.

ACTION TAKEN

A DTC P1710 is stored and both the "OD/OFF" and "SERVICE ENGINE SOON" indicators are illuminated.


DTC CHART TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. Checks if DTC P0500 is currently set in the ECM and to proceed with its respective DTC chart first.

2. Checks the operation of the VSS (Speedometer) circuit.

3. Checks for a broken speedometer cable.

4. Checks for a faulty VSS (Speedometer).

5. Checks for an open in YEL wire.

6. Checks for a poor connector terminal contact.

7. Checks for a faulty TCM.


DIAGNOSTIC AIDS

An intermittent condition may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Inspect the TCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and for poor terminal-to-wire connections.