Subaru Legacy (2005 year). Manual - part 624

5AT(diag)-87

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

7

CHECK AFTER REPAIR.
1) Perform the clear memory mode.
2) Drive for a while, read the DTC, and verify 
that there is no faulty.

Is DTC displayed?

Replace the TCM. 
<Ref. to 5AT-61, 
Transmission Con-
trol Module 
(TCM).>

Perform the diag-
nosis of DTC 
P0882. <Ref. to 
5AT(diag)-93, DTC 
P0882 TCM 
POWER INPUT 
SIGNAL LOW, 
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code 
(DTC).>

Step

Check

Yes

No

5AT(diag)-88

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AB:DTC P0801 REVERSE INHIBIT CONTROL CIRCUIT

DTC DETECTING CONDITION:
Shift lock solenoid malfunction, open or short reverse inhibitor control circuit
TROUBLE SYMPTOM:
• Gear is shifted from “N” range to “R” range during driving at 20 km/h (12 MPH) or more.
• Gear can not be shifted from “N” range to “R” range though the vehicle is parked.
WIRING DIAGRAM:

AT-01536

TCM

15

B55

E

B116

B55

B116

3
4

BODY INTEGRATED MODULE

SHIFT LOCK

SOLENOID

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

1 2

3 4

5 6 7 8 9 10

5AT(diag)-89

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse M/B (No. 12).

Is the fuse M/B (No. 12) blown 
out?

Replace the fuse 
M/B (No. 12). If the 
replaced fuse has 
blown out easily, 
repair the short cir-
cuit of harness 
between fuse M/B 
(No. 12) and TCM.

Go to step 2.

2

CHECK OUTPUT SIGNAL OF TCM.
1) Turn the ignition switch to ON.
2) With the brake pedal depressed, shift the 
select lever to “D” range.
3) Measure the voltage between TCM and 
chassis ground.

Connector & terminal

(B55) No. 15 (+) — Chassis ground (

−

):

Is the voltage more than 10.5 
V?

Go to step 3.

Replace the TCM. 
<Ref. to 5AT-61, 
Transmission Con-
trol Module 
(TCM).>

3

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND SHIFT LOCK SOLENOID.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and 
shift lock solenoid.
3) Measure the resistance of harness 
between TCM and shift lock solenoid connec-
tor.

Connector & terminal

(B55) No. 15 — (B116) No. 3:

Is the resistance less than 1 
Ω?

Go to step 4.

Repair the open 
circuit of harness 
between TCM and 
shift lock solenoid 
connector.

4

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND SHIFT LOCK SOLENOID.
Measure the resistance of harness between 
TCM and chassis ground.

Connector & terminal

(B55) No. 15 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 5.

Repair the short 
circuit of harness 
between TCM and 
shift lock solenoid 
connector.

5

CHECK HARNESS BETWEEN SHIFT LOCK 
SOLENOID AND CHASSIS GROUND TERMI-
NAL.
Measure the resistance of harness between 
shift lock solenoid and chassis ground.

Connector & terminal

(B116) No. 4 — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 6.

Repair the open 
circuit of harness 
between chassis 
ground and shift 
lock solenoid con-
nector.

6

CHECK SHIFT LOCK SOLENOID.
Measure the resistance of shift lock solenoid 
terminals.

Connector & terminal

(B116) No. 3 — No. 4:

Is the resistance 7 — 21 

Ω

Go to step 7.

Replace the shift 
lock solenoid.

5AT(diag)-90

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

7

CHECK OUTPUT SIGNAL OF TCM.
1) Jack-up the vehicle and support with rigid 
racks.

NOTE:

Raise all wheels off floor.

2) Start the engine.
3) Shift the select lever to “D” range and 
slowly increase vehicle speed to 20 km/h (12 
MPH).

NOTE:

The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When AT control di-
agnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS(diag)-26, Clear Memory
Mode.>

4) Measure the voltage between TCM and 
chassis ground.

Connector & terminal

(B55) No. 15 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Even if the SPORT 
indicator lights up, 
the circuit has 
returned to nor-
mal condition at 
this time. A tempo-
rary poor contact 
of connector or 
harness may be 
the cause. Repair 
the harness or 
connector in 
reverse inhibitor 
control circuit.

Go to step 8.

8

CHECK POOR CONTACT.

Is there poor contact in the 
reverse inhibitor control circuit?

Repair the poor 
contact.

Replace the TCM. 
<Ref. to 5AT-61, 
Transmission Con-
trol Module 
(TCM).>

Step

Check

Yes

No