Transmission Range Circuit Low - PO707

new 4/11/2004

I was wondering if anyone can help me with a code. I was playing with the overdrive button in the city, driving with in on and off to see what the difference would be. Anyway the next day the transmission wants to shift constantly in and out of Overdrive. I decided to take the car for a spirited spin down the highway and that has seemed to cure the problem but now I have a code PO707 (Transmission Range Circuit Low) Does any one know what exactly this code is and could/should I erase it or should I take it in to the stealer. The Transmission only has 5000 miles on it. Any help would be appreciated.

Clay

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4/15/2004

Just an up date on the PO707 TR sensor. I did the simplest thing that a person could have done and cleaned the pins on the sensor and the crud that was in the female end of the connection to the TR Sensor. Plugged it back in started the car and the SES light went out and the condition has not repeated it self. I have also insulated this sensor form contaminates getting in as the seal on this sensor is very poor. Just thought you would like to know.

Clay

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P0707

TR circuit below minimum voltage.

TR sensor, circuit or powertrain control module shorted or grounded.

Increase in EPC pressure, firm shifts, harsh engagements, default to 3rd gear, may activate MIL.

Pin Number	Circuit	Circuit Function
1	—	Not Used
2	359 (GY/R)	TR Sensor Signal Return
3	199 (LB/Y)	TR Sensor to PCM
4	1146 (LG/R)	TR Sensor Position "P"
5	1147 (P/O)	TR Sensor Position "N"
6	1148 (LTBL/BK)	TR Sensor Position "D"
7	262 (BR/PK)	Fused Feed From Ignition START
8	140 (PK/BK)	Backup Lamps
9	1093 (T/R)	Starter
10	1087 (O)	Fused Feed From Ignition "RUN"
11	1149 (W/O)	TR Sensor Position "2"
12	1150 (DKBL/W)	TR Sensor Position "L"

PINPOINT TEST D: TRANSMISSION RANGE (TR) SENSOR

NOTE: Refer to the Transmission Range (TR) Sensor Connector illustration preceding these pinpoint tests.

Pinpoint Test D—TR Sensor Testing— Enhancement

D1 AX4N ELECTRONIC DIAGNOSTICS

Check to make sure TR sensor harness connector C107 is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
Verify shift linkage adjustment in the OVERDRIVE position.
Turn ignition switch OFF.
Apply park brake.
Place transaxle in NEUTRAL.
Verify that Transmission Range (TR) Sensor Alignment Tool MLPS T92P-70010-AH fits in the appropriate slots.

Is the sensor properly adjusted?

Yes	No
REMOVE tool. GO to D2 .	ADJUST sensor as described under Assembly. After adjustments, PLACE transaxle range selector in PARK. CLEAR DTC and REPEAT Quick Test.

D2 CHECK ELECTRICAL SIGNAL OPERATION

CAUTION: DO NOT PRY on connector. This will damage the connector and could result in a transaxle concern. Press button and pull up on the transaxle harness connector.

Turn ignition switch OFF.
Disconnect TR sensor harness connector C107 .
Using a mirror, inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires and missing or damaged seals.
Connect a voltmeter positive test lead to TR circuit C107 and negative test lead to signal return (SIGRTN) circuit C107 of TR sensor harness connector.
Place voltmeter on 20 volt scale.
Turn ignition switch to RUN, engine off.

Is voltage between 4.75 and 5.25 volts?

Yes	No
GO to D5	GO to D3 .

D3 CHECK CONTINUITY OF TR SENSOR HARNESS CIRCUITS

CAUTION: Do not pry connector. This will damage the connector and could result in a transaxle concern. Press button and pull up on the transaxle harness connector.

Turn ignition switch OFF.
Disconnect TR sensor.
Inspect for damage or pushed out pins, corrosion, or loose wires.
Install Rotunda 104-Pin Breakout Box 014-00950 or equivalent. Leave powertrain control module disconnected.
Disconnect powertrain control module. Inspect for damaged or pushed out pins, corrosion, or loose wires.
Measure resistance between PCM Test Pin 91 at breakout box and SIG RTN circuit at TR sensor vehicle harness connector C107 .
Measure resistance between PCM Test Pin 64 at breakout box and TR signal circuit C107 at TR sensor vehicle harness connector.

Is each resistance less than 5.0 ohms?

Yes	No
GO to D4 .	SERVICE OPEN circuit(s). REMOVE breakout box. RECONNECT all components. ERASE DTCs. REPEAT Quick Test.

D4 CHECK TR SENSOR CIRCUIT FOR SHORTS TO POWER AND GROUND

Make sure Rotunda 104-Pin Breakout Box 014-00950 or equivalent is installed and powertrain control module disconnected.
Make sure TR sensor harness connector is disconnected.
Measure resistance between PCM Test Pin 64 and test Pins 71/97, at the breakout box.
Measure resistance between PCM Test Pin 64 and Test Pins 24/51/76/77/103 and 91 at the breakout box and chassis ground.

Is each resistance greater than 10,000 ohms?

Yes	No
GO to D5	SERVICE short circuit. REMOVE breakout box. RECONNECT all components. ERASE DTCs. REPEAT Quick Test.

D5 CHECK TRANSMISSION RANGE SENSOR RESISTANCE

Disconnect the TR sensor harness connector C107 at the transaxle.
Connect the proper transmission tester TR/MLP adapter cable B (007-00127) or cable E (007-00111) (for vehicle equipped with illuminated instrument panel) to sensor and tester.
Install appropriate overlay onto tester.

Using procedures provided with tester, verify sensor resistance functions in all positions.

Transmission Range Selector Lever Position	Resistance (Ohms)		Range Volts
Transmission Range Selector Lever Position	Min	Max	Range Volts
P	3770	4607	3.97-4.85
R	1304	1593	3.24-3.96
N	660	807	2.55-3.11
(D)	361	442	1.88-2.30
D/2	190	232	1.23-1.51
1	78	95	0.61-0.75

Are the resistance values within specifications.

Yes	No
If you are here as a result of NO VREF from D2 , REPLACE powertrain control module. ERASE all DTCs, RERUN Quick Test and GO to D6 .	REPLACE TR sensor and adjust. REFER to Transaxle Assembly section. ERASE codes and REPEAT Quick Test.

D6 CHECK PARK/NEUTRAL CIRCUITS OF SENSOR

Using the procedures described in the tester manual check the park/neutral circuits of the sensor in all gear positions.

Monitor the status lamp on the tester for proper indications.


Park	Less Than 5 Ohms
Reverse	Greater Than 100K Ohms
Neutral	Less Than 5.0 Ohms
(D)	Greater Than 100K Ohms
Second (2)	Greater Than 100K Ohms
First (1)	Greater Than 100K Ohms

Do the park/neutral circuits operate properly, and only in the proper gear position?

Yes	No
GO to D7 . If diagnosing a park/neutral circuit or starting concern, REFER to Section 03-06 .	REPLACE the TR sensor and adjust. REFER to Transaxle Assembly for procedures. ERASE DTCs and RERUN Quick Test.

D7 CHECK REVERSE/BACKUP LAMP CIRCUITS OF SENSOR

Using the procedures described in the tester manual check the reverse/backup circuits of the sensor in all gear positions.

Monitor the status lamp on the tester for proper indications.


Park	Greater Than 100K Ohms
Reverse	Less Than 5.0 Ohms
Neutral	Greater Than 100K Ohms
(D)	Greater Than 100K Ohms
Second (2)	Greater Than 100K Ohms
First (1)	Greater Than 100K Ohms

Do the reverse backup circuits operate properly and only in the proper gear position?

Yes	No
GO to D8 . If diagnosing only a reverse/backup circuit concern, REFER to Section 17-01 .	REPLACE the TR sensor and adjust. REFER to Transaxle Assembly for procedures. ERASE DTCs and RERUN Quick Test.

D8 CHECK OPTIONAL CIRCUITS (TAILGATE RELEASE) OF SENSOR (IF EQUIPPED)

Using the procedures described in the tester manual check the optional circuits of the sensor in all gear positions.

Monitor the status lamp on the tester for proper indications.


Park	Less Than 5.0 Ohms
Reverse	Greater Than 100K Ohms
Neutral	Greater Than 100K Ohms
(D)	Greater Than 100K Ohms
Second (2)	Greater Than 100K Ohms
First (1)	Greater Than 100K Ohms

Do the optional circuits operate properly and only in the proper gear position?

Yes	No
If equipped with instrument panel illumination, GO to D9 . If not, the concern is not in the sensor. If you were directed here from Diagnosis by Symptom , return to routine. If you were diagnosing a DTC, REFER to the Powertrain Control/Emissions Diagnosis Manual to diagnose intermittent concerns.	REPLACE the TR sensor. RE-ADJUST. REFER to Transaxle Assembly for procedures. ERASE DTCs and RERUN Quick Test.

D9 CHECK INSTRUMENT PANEL ILLUMINATION CIRCUITS OF SENSOR (IF EQUIPPED)

CAUTION: Be sure that the correct 12 pin sensor connector is connected to the proper sensor. Refer to the appropriate year service manual for the correct TR-E cable connector to use (ANALOG or DIGITAL). If the wrong connection is made or the slide switch is in the wrong position, the LEDs on the TR Position cable will give a false or no response during testing. This will cause the replacement of good parts.

Using the procedures described in the tester manual check the instrument panel illumination circuits of the sensor in all gear positions.
Monitor the status lamp on the tester for proper indications.

Do the instrument panel indicator circuits operate properly and ONLY in the proper gear?

Yes	No
Concern is not in TR sensor. If directed here from Diagnosis by Symptom , return to routine. If diagnosing a DTC, REFER to Powertrain Control/Emissions Diagnosis Manual to diagnose intermittent concerns. If diagnosing an instrument panel indicator circuit concern, REFER to Section 13-01 .	REPLACE the TR sensor and adjust. REFER to Transaxle Assembly for procedures. ERASE DTCs and RERUN Quick Test.

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Thanks for the info,
I took the car for another 1/2 hour drive in the city and could not get the situation to repeat itself and the SES light went out. Is this normal ?????

Clay

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