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Discussion Starter #1
Hey All,

Service Engine Soon light blinks then goes solid, then blinks, etc...

AUTOZONE boys did a code lookup and came up with..

P0756 Solenoid B Performance or Stuck Off

They had no clue what it is, I did some google searched and found nothing..

Anyone have any info for me ?

Car's symptoms:

Sputtering... low idle (about 600)
Exhaust smells rich
Gas mileage is horrible
1st gear occasionally slips

1997 Taurus GL, 128K miles
 
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According to the CD, shift solenoid #2 has a mechanical or hydraulic failure. I have no idea how to check this though, perhaps someone else can shed some light.
 
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ATX's aren't my thing. Neither are electronics. Part of being a good mechanic is knowing your limits and letting someone else take over.

Not to worry though, I'm still tEh MaN. :)
 

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The Gen 3s have a problem sometimes with the internal wire harness. Otherwise it may be a bad solenoid. Both problems can be fixed without dropping the tranny but it still is a PITB.

PINPOINT TEST A: SHIFT SOLENOIDS
NOTE: Refer to the Transaxle Internal Harness illustration preceding these pinpoint tests.



NOTE: Refer to the Transaxle Harness Connector illustration preceding these pinpoint tests.




A1 AX4N ELECTRONIC DIAGNOSTICS
Check to make sure transaxle harness connector C168 is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
Connect New Generation Star (NGS) Tester 007-00500 or equivalent.
Perform KOEO test until continuous DTC have been displayed.
Enter Output Test Mode (OTM). Refer to Special Test Modes.
Select the mode "ALL ON".
Press START to turn outputs "ON".
Push STOP to turn outputs "OFF".
Does vehicle enter OTM?
Yes No
REMAIN in OTM. GO to A2 . PRESS START. If vehicle does not enter OTM, REFER to Powertrain Control/Emissions Diagnosis Manual.

A2 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.

Disconnect transaxle harness connector C168 .
Using a mirror, inspect both ends of connector for damage or pushed out pins, corrosion, loose wires, and missing or damaged seals.
Connect a voltmeter positive lead to VPWR Pin C168 and the negative test lead to the solenoid circuit of the transmission vehicle harness connector Pin C168 , C168 , C168 .
Place voltmeter on 20 volt scale.
While observing voltmeter, press start and stop to cycle solenoid output ON and OFF.
Does the suspect solenoid output voltage change at least 0.5 volt?
Yes No
GO to A5 . GO to A3 .

A3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS
Turn ignition switch OFF.
Make sure transaxle harness connector C168 is disconnected.
Disconnect powertrain control module , 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.
Measure resistance between PCM Signal Test Pins 1, 27 or 53 at the breakout box and the signal pins at the transmission harness connector C168 , C168 , C168 .
Measure resistance between PCM Signal Test Pin 71 and 97 at breakout box and signal pin at the transmission harness connector C168 .
Is each resistance less than 5.0 ohms?
Yes No
GO to A4 . SERVICE open circuits. REMOVE breakout box. RECONNECT all components. REPEAT Quick Test.

A4 CHECK SOLENOID HARNESS FOR SHORTS TO POWER AND GROUND
Ensure Rotunda 104-Pin Breakout Box 014-00950 or equivalent is installed and powertrain control module disconnected.
For vehicles equipped with a 3.0L 2V and 3.0L 4V engine, measure the resistance between PCM signal output pins 6, 11 and 20 and test pins 71 and 97 at the breakout box.
For vehicles equipped with a 3.0L 2V and 3.0L 4V engine, measure the resistance between PCM signal output pins 6, 11 and 20 and test pins 24, 51, 76, 77, 91 and 103 at the breakout box and chassis ground.
For vehicles equipped with a 4.4L SHO engine, measure the resistance between PCM signal output pins 6, 11 and 20 and test pins 71 and 97 at the breakout box.
For vehicles equipped with a 4.4L SHO engine, measure the resistance between PCM signal output pins 6, 11 and 20 and test pins 24, 51, 76, 77, 91 and 103 at the breakout box and chassis ground.
Is each resistance greater than 10,000 ohms?
Yes No
GO to A5 . SERVICE short circuit. REMOVE breakout box. RECONNECT all components. REPEAT Quick Test.

A5 TRANSAXLE FUNCTIONAL TEST
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.

Disconnect transaxle harness connector C168 .
Install Rotunda Transmission Tester AX4N Compatible 007-00130 and AX4N Cable and Overlay 007-00117 or equivalent to transaxle connector.
Using tests described under Transmission Tester Instructions:
Perform solenoid voltage tests described under Rotunda Transmission Tester.
NOTE: LED will turn green when solenoid activates and turn off when deactivated. LED will turn red if an activated solenoid/harness is shorted to B+. LED will remain off if an activated solenoid/harness is shorted to ground or no continuity (open circuit).



Do the solenoids (LED) activate (LED green)?
Yes No
GO to A6 GO to A7

A6 TRANSAXLE DRIVE CYCLE TEST
Connect powertrain control module.
Perform Transaxle Drive Cycle Test as described under On-Board Diagnostics with NGS.
Does the vehicle upshift when commanded by the tester?
Yes No
REPLACE powertrain control module . ERASE all DTCs. Road test and run self test. If symptoms are still present, REFER to Hydraulic/ Mechanical Diagnostic Routines in Diagnosis by Symptom. GO to A7

A7 CHECK RESISTANCE OF SOLENOID/HARNESS
NOTE: Refer to the AX4N transmission tester for terminal locations.



Bench/Drive switch in BENCH mode.
Rotate solenoid select switch to OHMS CHECK position.
Connect ohmmeter negative lead to SSA jack and positive lead to VPWR jack on tester.
This is to test SSA.




Record resistance.
Resistance should be 15-25 ohms.
Connect ohmmeter negative lead to SSB jack and positive lead to VPWR jack on tester.
This is to test SSB.
Record resistance.
Resistance should be 15-25 ohms.
Connect ohmmeter negative lead to SSC jack and positive lead to VPWR jack on tester.
This is to test SSC.
Resistance should be 15-25 ohms.
Is resistance for all solenoids 15-25 ohms?
Yes No
GO to A8 Out of specification may be caused by internal harness or solenoid concerns. GO to A9

A8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND
Check each solenoid for continuity between BAT- jack (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps):

Solenoid Tester Jack
SSA SSA/SS1VPWR
SSB SSB/SS2/VPWR
SSC SSC/SS3/VPWR






Connection should show infinite resistance (no continuity).
Is there continuity?
Yes No
GO to A9 GO to Diagnosis by Symptom Index to diagnose shift concerns.

A9 AX4N INTERNAL ELECTRONIC DIAGNOSTICS
Drain transmission fluid.
Remove transaxle side pan.
Check that internal harness connectors are fully engaged on the shift solenoids.
Check that internal harness connector terminals are fully seated in the connectors.
Inspect connectors for damage.
Are connectors OK?
Yes No
GO to A10 SERVICE as required.

A10 CHECK INTERNAL AX4N HARNESS (CONTINUITY)
CAUTION: Do not probe into connector terminals, as this will cause a loss of spring tension and possible failure.

Disconnect the internal harness from the solenoid assemblies.
For SSA, connect positive lead from an ohmmeter to tester jack SSA and negative lead at the orange wire of the SSA connector.
Record resistance.
Resistance should be less than 0.5 ohm.
For SSB, connect positive lead from an ohmmeter to tester jack SSB negative lead at the pink wire of the SSB connector.
Record resistance.
Resistance should be less than 0.5 ohm.
For SSC, connect positive lead from an ohmmeter to tester SSC jack and negative lead at the yellow wire of the SSC connector.
Record resistance.
Resistance should be less than 0.5 ohm.
For SSA, SSB, and SSC VPWR, connect the positive lead from an ohmmeter to the appropriate solenoid for VPWR and negative lead to the red wire SSA, SSB or SSC VPWR.
Record resistance.
Resistance should be less than 0.5 ohm.
Are all three shift solenoids circuits' resistances less than 0.5 ohm?
Yes No
GO to A11 REPLACE internal harness. GO to A12

A11 CHECK INTERNAL AX4N HARNESS (SHORTS TO GROUND)
Check for continuity between BAT- jack (engine ground) and appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid Signal VPWR
SSA Orange Red
SSB Pink Red
SSC Yellow Red


Connection should show infinite resistance (no continuity).
Is there continuity?
Yes No
REPLACE internal harness. GO to A12 GO to A12

A12 CHECK SOLENOID RESISTANCE AT SOLENOID
Check solenoid resistance by connecting an ohmmeter at the terminals of the solenoid assembly.
Measure and record resistance for each solenoid. (SSA, SSB, SSC).
Is resistance between 15-25 ohms?
Yes No
GO to A13 REPLACE shift solenoid.

A13 CHECK SOLENOID FOR SHORT TO GROUND
Check for continuity between engine ground and appropriate shift solenoid terminal with ohmmeter or other low current tester (less than 200 milliamps).

Solenoid Terminals As Marked On Solenoid
SSA +/-
SSB +/-
SSC +/-


Connection should show infinite resistance (no continuity).
Is there continuity?
Yes No
REPLACE shift solenoid. GO to Hydraulic/Mechanical Diagnostic Routines as described under Diagnosis by Symptom.
 

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Discussion Starter #6
Thanks for your help and all the info.

Turns out the code readers used by AutoZone arent always accurate.

Local mechanic hooked it up and the ECU reported misfires in Cylinders 1 & 3, as well as O2 sesor misreadings.

Sure enough, there was a bad wire and a fried plug. After replacing plugs & wires, checked the car again for codes.. no O2 codes this time.

Watching it for the next week for rough idle or lean/rich exhaust smells for a sign of O2 sesor problems.

Thanks Again.
Drew
 

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thats totally wrong code AZ gave you.. I guess the code readers are correct, but the folks messup when they lok up the code
 
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