DTC P1710 Back-Up Signal for Speed Sensor Circuit. Geo Tracker - 4WD 1996

For 1990-2009 cars
Automatic Transmission Controls Schematics

### 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 Condition

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 When the DTC Sets

• | DTC P1710 is stored.

• | The OD/OFF indicator turns on

• | The malfunction indicator lamp (MIL) turns on.

### Diagnostic Aids

An intermittent condition may be caused by a poor connection, rubbed 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

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

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).

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to On-Board Diagnostic System Check

2

1. Turn the ignition switch to ON.
2. Using a scan tool, read the DTCs.

Is DTC P0500 also currently set?

--

Go to DTC P0500 Diagnostic in Engine Controls

Go to Step 3

3

1. Turn ignition switch to LOCK.
2. Disconnect TCM electrical connector.
3. Raise the vehicle. Refer to Jacking and Lifting in General Information.
4. Lock left rear tire.
5. Using a DVM measure the resistance between ground and TCM terminal 16 while rotating the right rear wheel slowly on full revolution.

Does the resistance values change between continuity and infinity a few times as the wheel is rotated?

--

Go to Step 8

Go to Step 4

4

1. Remove I/P gauge cluster. Refer to IP Replacement in Instrument Panel, Gauges and Console.
2. Rotate the right rear wheel while observing the speedometer cable end.

Does the speedometer cable spin?

--

Go to Step 6

Go to Step 5

5 | Inspect for a broken or disconnected speedometer cable. Repair as necessary. Is the action complete? | -- | Go to Step 15 | --
6 | Using a DVM measure the resistance between VSS (speedometer) output terminals while rotating the speedometer shaft. Does the resistance values change between continuity and infinity 4 times per each speedometer shaft revolution? | -- | Go to Step 8 | Go to Step 7
7 | Replace the VSS (speedometer). Is the action complete? | -- | Go to Step 15 | --

8

1. Reconnect the TCM connector.
2. Remove I/P gauge cluster. Refer to IP Replacement in Instrument Panel, Gauges and Console.
3. Using a DVM, measure the resistance between the I/P gauge cluster connector C3 terminal 4 and TCM harness connector terminal 16.

Is the resistance less than the value specified?

2 ohms

Go to Step 9

Go to Step 10

9 | Inspect the TCM harness connector and I/P cluster connector C3 for poor terminal contact. Is poor terminal contact evident? | -- | Go to Step 12 | Go to Step 11
10 | Repair the open or high resistance in the YEL wire between the I/P gauge cluster and the TCM. Is the action complete? | -- | Go to Step 15 | --

11

1. Turn the ignition key to LOCK.
2. Reinstall the I/P gauge cluster.
3. Reconnect the TCM.
4. Road test the vehicle and retest.

Does the DTC reset?

--

Go to Step 13

Go to Step 14

12 | Repair the terminal or connection that exhibits poor contact and recheck. Is the action complete? | -- | Go to Step 15 | --
13 | Replace the TCM. Is the action complete? | -- | Go to Step 15 | --
14 | Refer to Diagnostic Aids in order to correct a possible intermittent malfunction. Is the procedure complete? | -- | Go to Step 15 | --

15

1. Reconnect the connectors.
2. Perform the DTC Confirmation Procedure.

Does the scan tool display any DTCs?

--

Go to the applicable DTC table

System OK