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Kevin C.
Kevin C., Subaru Master Tech.
Category: Subaru
Satisfied Customers: 1727
Experience:  34 years of Subaru service experience, ASE Master Technician.
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I have a 2006 Subaru legacy 2.5l wagon, with a automatic

Customer Question

I have a 2006 Subaru legacy 2.5l wagon, with a automatic transmission. The AWD, Cruise control, oil temp, and check engine lights are on. The tachometer doesn't work. The car has a low idle, it shifts a little hard taking off. After so many miles the tachometer will start working and runs great. I've check all grounds, checked wire connections all so the fuses and relays. The last set of codes it had where P0851and the other code was P1518. the was a speed sensor low input circuit.
JA: Does the light stay on, or does it blink?
Customer: They blink.
JA: Are you fixing your Legacy yourself? What have you tried so far?
Customer: Yes, Checked wire connections, fuses and relays, and ground wires. even speed sensors for the abs brakes.
JA: Anything else you want the mechanic to know before I connect you?
Customer: Yes replaced the crank sensor.
Submitted: 1 month ago.
Category: Subaru
Expert:  Ricardo Hohl replied 1 month ago.

Hi welcome to just answers my name is Ricardo Find and disconnect the Green D-Check special mode test connectors, 2 cavity green connectors just left of the steering column. They are normally unplugged. When connected together, it causes the PCM to go into output cycling KOEO and D-Check engine running.

Customer: replied 1 month ago.
You sure there by the steering wheel, not on the passenger side under the glove box. Then what do I do?
Expert:  Ricardo Hohl replied 1 month ago.

is on the left side of the steering just leave it disconnected this plug should not be left connected, then disconnect the battery terminal for 3 minutes

Customer: replied 1 month ago.
There is no green cavity filled connector on the left side of the sterling wheel. There is on the passenger side under the glove box.
Expert:  Ricardo Hohl replied 1 month ago.

ok depending on production dates this location may change did you disconnect it?

Customer: replied 1 month ago.
It wasn't connected
Expert:  Ricardo Hohl replied 1 month ago.

ok po851 and p1518 relates to this conector been connected or the wires shorted at the same connector under the glove box check the Orange/Blue wire at the test mode connectors for voltage, this should have a reference voltage from the Engine Control Module (ECM) pin B19. If there is none, check for a short to ground between the test mode connector and the ECM, and the ECM and pin 14 Orange at the Data Link Connector (DLC).

2. Remove this wire from pin B19 of the ECM and clear the codes to see if that fixes it.

Customer: replied 1 month ago.
There's voltage with the connector orange blue
Customer: replied 1 month ago.
I ran a OBD to see if there where any new codes. It brought up code P0700 (transmission control system.) It also brought up code P0506 (idle air control system RPM lower-than-expected)
Expert:  Ricardo Hohl replied 1 month ago.

Hi good morning where this codes in addition to the previous codes?

Customer: replied 1 month ago.
The original codes po851 and p1518 we're not on the OBD reader this time. The only codes that came where PO700 & PO506.
Expert:  Ricardo Hohl replied 1 month ago.

OK PO700 this code only lets you know there are transmission codes stored on your TCM

Expert:  Ricardo Hohl replied 1 month ago.

let me look up po506.

Customer: replied 1 month ago.
How do I retrieve those codes that are on the TCM and then what can be done.
Expert:  Ricardo Hohl replied 1 month ago.

PO506 is just a throttle idle circuit to low you need to clean the throttle body.

2. Perform the adaptive idle memory. Reset the adaptive values by disconnecting the negative battery terminal, touch it to the positive battery terminal, then leave the negative cable disconnected for about 15 minutes, and reconnect the negative cable.

Expert:  Ricardo Hohl replied 1 month ago.

you will still have PO700 this means you need to access the transmission controller. with a scanner but you can not use a code scanner you need a more advance scanner like snap on Modes you will need to have it scan by a repair shop that has one they will usually scan the codes at no cost to you.

Expert:  Ricardo Hohl replied 1 month ago.

check your transmission fluid also. Low transmission fluid may cause the torque converter to drag after braking hard and stall

Customer: replied 1 month ago.
Ok thx. I'll have that done, and let you know what turns up.
Expert:  Ricardo Hohl replied 1 month ago.

very good, talk to you then thank you.

Customer: replied 1 month ago.
Hello Ricardo, I got it scanned, besides the PO700 code it came up with PO750. It said a open or short in the crankshaft position sensor (CKP) circuit communication error between the engine control module (TCM) Failed crankshaft position sensor (CKP) He also ran on board testing which came up all ok. The crankshaft sensor was replaced a few weeks ago. The AWD, sport and oil engine temp. light all come on at the same time and off at the same time. When the tachometer stop's working they come on when start's to work they go off. So is there a break in the wire from the crankshaft sensor to the TCM or is the sensor bad again or is the TCM bad. Or does the transmission Fluid need to be changed.
Expert:  Ricardo Hohl replied 1 month ago.
Ok it seems like you may have a circuit problem maybe an open signal wire shorting out let me get back to my job in approximately 1 hour and open up a wire schematic to see what needs to be done ok
Customer: replied 1 month ago.
Ok thank you.
Expert:  Ricardo Hohl replied 1 month ago.

I looked up this codes and P0750 does not exist on this vehicle are you sure You have the right code?

Expert:  Ricardo Hohl replied 1 month ago.

do i have the right year and model is it turbo 2.5

Customer: replied 1 month ago.
No it's not a turbo. It's a 2006 Subaru legacy wagon, 2.5l automatic. OTB
Expert:  Ricardo Hohl replied 1 month ago.

OK let me look it up again

Expert:  Ricardo Hohl replied 1 month ago.

this code is not related to a crank sensor this code is for shift solenoid "A" shorted this controls your transmission up shift.

Expert:  Ricardo Hohl replied 1 month ago.

sorry but i can't come up with the right diagnostic this code does not relate to the problem you have therefore let me let another expert come in and help OK.

Customer: replied 1 month ago.
Ok thank you,
Expert:  eric remington replied 1 month ago.

I can help but I think a phone call at this point would be best