P0707-TRANSMISSION RANGE SENSOR CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The Transmission Range Sensor (TRS) has a contact point for each shift lever position. The Transmission Control Module (TCM) monitors the signal from the TRS which specifies the shift lever position. The TCM also broadcast the shift lever position over the CAN BUS to other modules.

When Monitored:
Ignition on with system voltage between 9.0 and 16.0 volts.
Vehicle speed above 10 Km/h (6 mph).
No other Transmission Range Sensor (TRS) DTCs present.
Set Condition:
If a continuous input signal loss is read by the TCM from the TRS for the period of 5 seconds. It takes two consecutive one trips of problem identification to light the MIL.

Possible Causes

TRANSMISSION RANGE SENSOR CONNECTOR UNPLUGGED OR DAMAGED

TRANSMISSION RANGE SENSOR IMPROPERLY INSTALLED OR OUT OF ADJUSTMENT

(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN

TRS SENSE CIRCUIT OPEN

TRS SENSE CIRCUIT SHORT TO GROUND

TRANSMISSION RANGE SENSOR

TRANSMISSION CONTROL MODULE

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Diagnostic Test

1. CHECK TO SEE IF THE DTC IS ACTIVE

With the scan tool, read Transmission DTCs.

Is the status Active or is the STARTS SINCE SET counter 2 or less for this DTC?

Yes

Go To 2

Go To 9

2. CHECK THE TRS HARNESS CONNECTOR

Turn the ignition off to the lock position.
Check if the TRS harness connector for terminal push out, corrosion or if it is properly plugged in.

NOTE: If the Transmission Range Sensor is unplugged the vehicle will not start.

Were there any problems found?

Yes

Repair as necessary.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Go To 3

3. CHECK THE TRS INSTALLATION AND ADJUSTMENT

Turn the ignition off to the lock position.
Check if the TRS is properly installed and adjusted per the Service Information. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT/TRANSMISSION RANGE SENSOR - INSTALLATION)

Was the TRS properly installed and adjusted?

Yes

Go To 4

Properly install or adjust the TRS per the Service Information.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

4. CHECK THE TRS READINGS ON THE SCAN TOOL

SHIFT LEVER POSITION TO TRS SWITCH STATE
PARK	REVERSE	NEUTRAL	DRIVE	LOW
T41 CLOSED	T42 CLOSED	T4 CLOSED	T3 CLOSED	T1 CLOSED

Ignition on, engine not running.
With the scan tool, read the TRS states while moving the shift lever to all positions note any circuits that do not change.

NOTE: Vehicles equipped with the AutoStick feature will not have a low range shift position.

Pick which answer best describes your findings:

One TRS Sense circuit failed to change on the scan tool

Go To 6

None of the TRS Sense circuits changed at all

Go To 5

All TRS Sense circuits changed properly on the scan tool

Check the Sift Lever Cable for proper adjustment and binding per the Service Information. If no problems are found, using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If again no problems are found, replace the TCM per the Service Information
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

5. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.
Disconnect the TRS harness connector.
Ignition on, engine not running.
Using the scan tool under TIPM, actuate the transmission.
Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuit in the TRS harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

Go To 8

Repair the (T16) Transmission Control Output circuit for an open.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

6. CHECK THE TRS SENSE CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.
Disconnect the TRS harness connector.
Check the resistance of the previously identified TRS Sense circuit between the TRS harness connector and the TCM harness connector.

Is the resistance above 5.0 ohms?

Yes

Repair the identified TRS Sense circuit for an open

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Go To 7

7. CHECK THE TRS SENSE CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off to the lock position.
Disconnect the TRS harness connector.
Check the resistance between ground and the identified TRS Sense circuit in the previous test procedure.

Is the resistance below 5.0 ohms?

Yes

Repair the identified TRS Sense circuit for a short to ground

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Replace the Transmission Range Sensor (TRS) per the Service Information.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

8. CHECK THE TRANSMISSION RANGE SENSOR

SHIFT LEVER POSITION TO TRS SWITCH STATE
PARK	REVERSE	NEUTRAL	DRIVE	LOW
T41 CLOSED	T42 CLOSED	T4 CLOSED	T3 CLOSED	T1 CLOSED

Stop the scan tool transmission actuation and turn the ignition off to the lock position.
Reconnect the TRS harness connector.
Disconnect the TCM C1 and C2 harness connectors.
Ignition on, engine not running.
Using the scan tool under TIPM, actuate the transmission.
Using a 12-volt test light connected to ground, check each TRS Sense circuit (T41, T42, T4, T3, and T1) in the TCM C1 and C2 harness connectors while moving the shift lever to each desired position.

NOTE: Use the above chart to identify which sense circuit should be closed in each shift lever position.

Does the test light illuminate brightly on all the TRS Sense circuits?

Yes

Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Replace the Transmission Range Sensor per the Service Information.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

9. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.

Were there any problems found?

Yes

Repair as necessary.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Test Complete.