199?-2004 How to Read AT Diagnostic Trouble Codes (DTCs) - Subaru Outback - Subaru Outback Forums

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Old 04-24-2012, 08:13 AM   #1 (permalink)
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Default 199?-2004 How to Read AT Diagnostic Trouble Codes (DTCs)

I thought this had been posted here as a separate thread, but couldn’t find anything other than links to USMB, so thought I’d start a new thread to complement http://www.subaruoutback.org/forums/...ght=read+codes.

(If this information is already in a DIY thread, then let me know and I’ll delete this one.)

On the 4EAT phase 1 (pre-approx. 1999) and early phase II 4EAT (approx. 1999 to approx. 2004), this procedure for extracting stored AT transmission trouble codes should work (information is from related service manuals):

PERFORM READ DIAGNOSTIC TROUBLE
CODE (DTC).

1) Warm-up the engine.
2) Turn ignition switch to OFF.
3) Turn ignition switch to ON.
4) Start the engine.
5) Drive vehicle at speeds greater than 20 km/h (12 MPH).
6) Stop vehicle.
7) Brake pedal depressed and move select lever to 1 range.
8) Turn ignition switch to OFF.
9) Turn ignition switch to ON.
10) Move select lever 2 range.
11) Move select lever 1 range.
12) Move select lever 2 range.
13) Move select lever 3 range.
14) Move select lever D range.

At this point the AT Oil Temp light will do one of three things: flash at a two flashes/second rate indicating there are no stored codes (“normal”); flash more rapidly at a 4 flashes/second rate indicating a power supply problem (less likely); or, flash with long and short flashes which is indicating the stored codes, with the long flashes representing “10”s, and the short flashes “1”s, as illustrated here:



The flashing is terminated when the key is turned to Off.

There are two lists of trouble codes, one for the Phase I and a longer one for the early Phase II.

Phase I

11 Line pressure duty solenoid. Short or Disconnection in solenoid driving circuit
12 Lockup duty solenoid. Short or disconnection in solenoid driving circuit
13 2-4 brake timing solenoid. Short or disconnection in solenoid driving circuit
14 Shift solenoid B. Short or disconnection in solenoid driving circuit
15 Shift solenoid A. Short or disconnection in solenoid driving circuit
16 2-4 brake duty solenoid. Short or disconnection in solenoid driving circuit
21 ATF temperature sensor. Short or disconnection in input circuit
22 Pressure sensor. Short or disconnection in input circuit
23 Engine speed signal. No signal input above 10km/h
24 Transfer duty solenoid. Short or disconnection in solenoid driving circuit
25 Engine torque control signal. Short or disconnection in engine torque control signal circuit
31 Throttle sensor. Short or disconnection in input circuit
32 Vehicle speed sensor 1. No signal input to speed sensor 1 above 20km/h
33 Vehicle speed sensor 2. No signal input to speed Sensor 2 above 20km/h
34 Turbine sensor. No signal input in ranges other than N range
36 Low clutch timing solenoid. Short or disconnection in solenoid driving circuit

Phase II

11 Engine speed signal. Detects open or shorted input signal circuit.
27 ATF temperature sensor. Detects open or shorted input signal circuit.
31 Throttle position sensor. Detects open or shorted input signal circuit.
33 Front vehicle speed sensor. Detects open or shorted input signal circuit.
36 Torque converter turbine speed sensor. Detects open or shorted input signal circuit.
38 Torque control signal. Detects open or shorted input signal circuit.
45 Intake manifold pressure signal. Detects open or shorted input signal circuit.
71 Shift solenoid 1. Detects open or shorted output signal circuit.
72 Shift solenoid 2. Detects open or shorted output signal circuit.
73 Low clutch timing solenoid. Detects open or shorted output signal circuit.
74 2-4 brake timing solenoid. Detects open or shorted output signal circuit.
75 Line pressure duty solenoid. Detects open or shorted output signal circuit.
76 2-4 brake duty solenoid. Detects open or shorted output signal circuit.
77 Lock-up duty solenoid. Detects open or shorted output signal circuit.
78 SPORT shift solenoid. Detects open or shorted output signal circuit.
79 Transfer duty solenoid. Detects open or shorted output signal circuit.
86 VDC communication signal. Detects open or shorted input signal circuit.
93 Rear vehicle speed sensor. Detects open or shorted input signal circuit.

Hope this helps . . .
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