SUBARU FORESTER 2004 Service Repair Manual

EN(H4SO)-73
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0130 O2 Sensor Circuit (Bank 1 Sensor 1) <Ref. to EN(H4SO)-120, DTC P0130 O2 SENSOR CIRCUIT (BANK 1 SEN-
SOR 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0131 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 1)<Ref. to EN(H4SO)-123, DTC P0131 O2 SENSOR CIRCUIT LOW VOLT-
AGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0132 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 1)<Ref. to EN(H4SO)-125, DTC P0132 O2 SENSOR CIRCUIT HIGH VOLT-
AGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0133 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 1)<Ref. to EN(H4SO)-127, DTC P0133 O2 SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0134 O
2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 1)<Ref. to EN(H4SO)-129, DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY
DETECTED (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0137 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 2)<Ref. to EN(H4SO)-131, DTC P0137 O2 SENSOR CIRCUIT LOW VOLT-
AGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0138 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 2)<Ref. to EN(H4SO)-134, DTC P0138 O2 SENSOR CIRCUIT HIGH VOLT-
AGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0139 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 2)<Ref. to EN(H4SO)-137, DTC P0139 O2 SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0171 System Too Lean (Bank 1) <Ref. to EN(H4SO)-138, DTC P0171 SYSTEM TOO LEAN (BANK 1), Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0172 System Too Rich (Bank 1) <Ref. to EN(H4SO)-139, DTC P0172 SYSTEM TOO RICH (BANK 1), Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0301 Cylinder 1 Misfire Detected <Ref. to EN(H4SO)-141, DTC P0301 CYLINDER 1 MISFIRE DETECTED,
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0302 Cylinder 2 Misfire Detected <Ref. to EN(H4SO)-141, DTC P0302 CYLINDER 2 MISFIRE DETECTED,
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0303 Cylinder 3 Misfire Detected <Ref. to EN(H4SO)-141, DTC P0303 CYLINDER 3 MISFIRE DETECTED,
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0304 Cylinder 4 Misfire Detected <Ref. to EN(H4SO)-142, DTC P0304 CYLINDER 4 MISFIRE DETECTED,
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0327 Knock Sensor 1 Circuit Low Input
(Bank 1 or Single Sensor)<Ref. to EN(H4SO)-148, DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW
INPUT (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0328 Knock Sensor 1 Circuit High Input
(Bank 1 or Single Sensor)<Ref. to EN(H4SO)-150, DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH
INPUT (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0335 Crankshaft Position Sensor “A” Cir-
cuit<Ref. to EN(H4SO)-152, DTC P0335 CRANKSHAFT POSITION SENSOR
“A” CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0336 Crankshaft Position Sensor “A” Cir-
cuit Range/Performance<Ref. to EN(H4SO)-154, DTC P0336 CRANKSHAFT POSITION SENSOR
“A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0340 Camshaft Position Sensor “A” Circuit
(Bank 1 or Single Sensor)<Ref. to EN(H4SO)-156, DTC P0340 CAMSHAFT POSITION SENSOR “A”
CIRCUIT (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0341 Camshaft Position Sensor “A” Circuit
Range/Performance (Bank 1 or Sin-
gle Sensor)<Ref. to EN(H4SO)-158, DTC P0341 CAMSHAFT POSITION SENSOR “A”
CIRCUIT RANGE/PERFORMANCE (BANK 1 OR SINGLE SENSOR), Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0400 Exhaust Gas Recirculation Flow <Ref. to EN(H4SO)-161, DTC P0400 EXHAUST GAS RECIRCULATION
FLOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> DTC Item NOTE

EN(H4SO)-74
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0420 Catalyst System Efficiency Below
Threshold (Bank 1)<Ref. to EN(H4SO)-164, DTC P0420 CATALYST SYSTEM EFFICIENCY
BELOW THRESHOLD (BANK 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0458 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit Low<Ref. to EN(H4SO)-166, DTC P0458 EVAPORATIVE EMISSION CON-
TROL SYSTEM PURGE CONTROL VALVE CIRCUIT LOW, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>
P0459 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit High<Ref. to EN(H4SO)-169, DTC P0459 EVAPORATIVE EMISSION CON-
TROL SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0461 Fuel Level Sensor Circuit Range/Per-
formance<Ref. to EN(H4SO)-171, DTC P0461 FUEL LEVEL SENSOR CIRCUIT
RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0462 Fuel Level Sensor Circuit Low Input <Ref. to EN(H4SO)-173, DTC P0462 FUEL LEVEL SENSOR CIRCUIT LOW
INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0463 Fuel Level Sensor Circuit High Input <Ref. to EN(H4SO)-176, DTC P0463 FUEL LEVEL SENSOR CIRCUIT
HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0464 Fuel Level Sensor Circuit Intermittent <Ref. to EN(H4SO)-179, DTC P0464 FUEL LEVEL SENSOR CIRCUIT
INTERMITTENT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0483 Cooling Fan Rationality Check <Ref. to EN(H4SO)-181, DTC P0483 COOLING FAN RATIONALITY
CHECK, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0502 Vehicle Speed Sensor Circuit Low
Input<Ref. to EN(H4SO)-184, DTC P0502 VEHICLE SPEED SENSOR CIRCUIT
LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0503 Vehicle Speed Sensor Intermittent/
Erratic/High<Ref. to EN(H4SO)-185, DTC P0503 VEHICLE SPEED SENSOR CIRCUIT
HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0506 Idle Control System RPM Lower
Than Expected<Ref. to EN(H4SO)-187, DTC P0506 IDLE CONTROL SYSTEM RPM
LOWER THAN EXPECTED, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0507 Idle Control System RPM Higher
Than Expected<Ref. to EN(H4SO)-189, DTC P0507 IDLE CONTROL SYSTEM RPM
HIGHER THAN EXPECTED, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0512 Starter Request Circuit <Ref. to EN(H4SO)-191, DTC P0512 STARTER REQUEST CIRCUIT, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0513 Incorrect Immobilizer Key <Ref. to IM-20, DTC P0513 INCORRECT IMMOBILIZER KEY, Diagnostics
Procedure with Diagnostic Trouble Code (DTC).>
P0519 Idle Control System Malfunction
(Fail-Safe)<Ref. to EN(H4SO)-194, DTC P0519 IDLE CONTROL SYSTEM MALFUNC-
TION (FAIL-SAFE), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0565 Cruise Control On Signal <Ref. to EN(H4SO)-196, DTC P0565 CRUISE CONTROL ON SIGNAL,
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0604 Internal Control Module Random
Access Memory (RAM) Error<Ref. to EN(H4SO)-198, DTC P0604 INTERNAL CONTROL MODULE
READ ACCESS MEMORY (RAM) ERROR, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0691 Cooling Fan 1 Control Circuit Low <Ref. to EN(H4SO)-200, DTC P0691 COOLING FAN 1 CONTROL CIRCUIT
LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0692 Cooling Fan 1 Control Circuit High <Ref. to EN(H4SO)-203, DTC P0692 COOLING FAN 1 CONTROL CIRCUIT
HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0703 Torque Converter/Brake Switch “B”
Circuit<Ref. to EN(H4SO)-206, DTC P0703 TORQUE CONVERTER/BRAKE
SWITCH “B” CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0705 Transmission Range Sensor Circuit
(PRNDL Input)<Ref. to 4AT(H4SO)-95, CHECK INHIBITOR SWITCH, Diagnostic Proce-
dure without Diagnostic Trouble Code (DTC).>
P0710 Transmission Fluid Temperature
Sensor Circuit<Ref. to 4AT(H4SO)-38, DTC 27 ATF TEMPERATURE SENSOR, Diagnos-
tic Procedure with Diagnostic Trouble Code (DTC).>
P0716 Torque converter turbine speed sen-
sor<Ref. to 4AT(H4SO)-49, DTC 36 TORQUE CONVERTER TURBINE SPEED
SENSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> DTC Item NOTE

EN(H4SO)-75
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0720 AT Vehicle Speed Sensor Circuit
Malfunction<Ref. to 4AT(H4SO)-45, DTC 33 FRONT VEHICLE SPEED SENSOR, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0726 Engine Speed Input Circuit Malfunc-
tion<Ref. to 4AT(H4SO)-36, DTC 11 ENGINE SPEED SIGNAL, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>
P0731 Gear 1 Incorrect Ratio <Ref. to EN(H4SO)-208, DTC P0731 GEAR 1 INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0732 Gear 2 Incorrect Ratio <Ref. to EN(H4SO)-208, DTC P0732 GEAR 2 INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0733 Gear 3 Incorrect Ratio <Ref. to EN(H4SO)-208, DTC P0733 GEAR 3 INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0734 Gear 4 Incorrect Ratio <Ref. to EN(H4SO)-209, DTC P0734 GEAR 4 INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0741 Torque Converter Clutch Circuit Per-
formance or Stuck Off<Ref. to EN(H4SO)-210, DTC P0741 TORQUE CONVERTER CLUTCH
CIRCUIT PERFORMANCE OR STUCK OFF, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0743 Torque Converter Clutch Circuit Elec-
trical<Ref. to 4AT(H4SO)-74, DTC 77 LOCK-UP DUTY SOLENOID, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0748 Pressure Control Solenoid “A” Elec-
trical<Ref. to 4AT(H4SO)-68, DTC 75 LINE PRESSURE DUTY SOLENOID, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0753 Shift Solenoid “A” Electrical <Ref. to 4AT(H4SO)-56, DTC 71 SHIFT SOLENOID 1, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0758 Shift Solenoid “B” Electrical <Ref. to 4AT(H4SO)-59, DTC 72 SHIFT SOLENOID 2, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0771 Low clutch timing solenoid <Ref. to 4AT(H4SO)-62, DTC 73 LOW CLUTCH TIMING SOLENOID, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0778 Pressure Control Solenoid “B” Elec-
trical<Ref. to 4AT(H4SO)-71, DTC 76 2-4 BRAKE DUTY SOLENOID, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0785 Shift/Timing Solenoid <Ref. to 4AT(H4SO)-65, DTC 74 2-4 BRAKE TIMING SOLENOID, Diagnos-
tic Procedure with Diagnostic Trouble Code (DTC).>
P0851 Neutral Switch Input Circuit Low <Ref. to EN(H4SO)-212, DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT
LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> or <Ref.
to EN(H4SO)-214, DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW
(MT MODEL), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0852 Neutral Switch Input Circuit High <Ref. to EN(H4SO)-217, DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT
HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0864 TCM Communication Circuit Range/
Pe r fo r ma nc e<Ref. to EN(H4SO)-220, DTC P0864 TCM COMMUNICATION CIRCUIT
RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0865 TCM Communication Circuit Low <Ref. to EN(H4SO)-222, DTC P0865 TCM COMMUNICATION CIRCUIT
LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0866 TCM Communication Circuit Low <Ref. to EN(H4SO)-224, DTC P0866 TCM COMMUNICATION CIRCUIT
HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1110 Atmospheric Pressure Sensor Circuit
Malfunction (Low Input)<Ref. to EN(H4SO)-226, DTC P1110 ATMOSPHERIC PRESSURE SEN-
SOR CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P1111 Atmospheric Pressure Sensor Circuit
Malfunction (High Input)<Ref. to EN(H4SO)-226, DTC P1111 ATMOSPHERIC PRESSURE SEN-
SOR CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P1134 A/F Sensor Micro-Computer Problem <Ref. to EN(H4SO)-227, DTC P1134 A/F SENSOR MICRO-COMPUTER
PROBLEM, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1137 O
2 Sensor Circuit (Lambda= 1)
(Bank 1 Sensor 1)<Ref. to EN(H4SO)-229, DTC P1137 O2 SENSOR CIRCUIT (LAMBDA=1)
(BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P1492 EGR Valve Signal #1 Circuit Malfunc-
tion (Low Input)<Ref. to EN(H4SO)-232, DTC P1492 EGR VALVE SIGNAL #1 CIRCUIT
MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).> DTC Item NOTE

EN(H4SO)-76
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1493 EGR Valve Signal #1 Circuit Malfunc-
tion (High Input)<Ref. to EN(H4SO)-232, DTC P1493 EGR VALVE SIGNAL #1 CIRCUIT
MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1494 EGR Valve Signal #2 Circuit Malfunc-
tion (Low Input)<Ref. to EN(H4SO)-232, DTC P1494 EGR VALVE SIGNAL #2 CIRCUIT
MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1495 EGR Valve Signal #2 Circuit Malfunc-
tion (High Input)<Ref. to EN(H4SO)-232, DTC P1495 EGR VALVE SIGNAL #2 CIRCUIT
MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1496 EGR Valve Signal #3 Circuit Malfunc-
tion (Low Input)<Ref. to EN(H4SO)-232, DTC P1496 EGR VALVE SIGNAL #3 CIRCUIT
MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1497 EGR Valve Signal #3 Circuit Malfunc-
tion (High Input)<Ref. to EN(H4SO)-232, DTC P1497 EGR VALVE SIGNAL #3 CIRCUIT
MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1498 EGR Valve Signal #4 Circuit Malfunc-
tion (Low Input)<Ref. to EN(H4SO)-233, DTC P1498 EGR VALVE SIGNAL #4 CIRCUIT
MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1499 EGR Valve Signal #4 Circuit Malfunc-
tion (High Input)<Ref. to EN(H4SO)-235, DTC P1499 EGR VALVE SIGNAL #4 CIRCUIT
MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1510 ISC Solenoid Valve Signal #1 Circuit
Malfunction (Low Input)<Ref. to EN(H4SO)-237, DTC P1510 ISC SOLENOID VALVE SIGNAL #1
CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1511 ISC Solenoid Valve Signal #1 Circuit
Malfunction (High Input)<Ref. to EN(H4SO)-237, DTC P1511 ISC SOLENOID VALVE SIGNAL #1
CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1512 ISC Solenoid Valve Signal #2 Circuit
Malfunction (Low Input)<Ref. to EN(H4SO)-237, DTC P1512 ISC SOLENOID VALVE SIGNAL #2
CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1513 ISC Solenoid Valve Signal #2 Circuit
Malfunction (High Input)<Ref. to EN(H4SO)-237, DTC P1513 ISC SOLENOID VALVE SIGNAL #2
CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1514 ISC Solenoid Valve Signal #3 Circuit
Malfunction (Low Input)<Ref. to EN(H4SO)-237, DTC P1514 ISC SOLENOID VALVE SIGNAL #3
CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1515 ISC Solenoid Valve Signal #3 Circuit
Malfunction (High Input)<Ref. to EN(H4SO)-237, DTC P1515 ISC SOLENOID VALVE SIGNAL #3
CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1516 ISC Solenoid Valve Signal #4 Circuit
Malfunction (Low Input)<Ref. to EN(H4SO)-238, DTC P1516 ISC SOLENOID VALVE SIGNAL #4
CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1517 ISC Solenoid Valve Signal #4 Circuit
Malfunction (High Input)<Ref. to EN(H4SO)-240, DTC P1517 ISC SOLENOID VALVE SIGNAL #4
CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1518 Starter Switch Circuit Low Input <Ref. to EN(H4SO)-242, DTC P1518 STARTER SWITCH CIRCUIT LOW
INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1560 Back-Up Voltage Circuit Malfunction <Ref. to EN(H4SO)-245, DTC P1560 BACK-UP VOLTAGE CIRCUIT MAL-
FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1570 ANTENNA <Ref. to IM-21, DTC P1570 ANTENNA, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P1571 Reference Code Incompatibility <Ref. to IM-15, DTC P1571 REFERENCE CODE INCOMPATIBILITY, Diag-
nostics Procedure with Diagnostic Trouble Code (DTC).>
P1572 IMM Circuit Failure <Ref. to IM-16, DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA
CIRCUIT), Diagnostics Procedure with Diagnostic Trouble Code (DTC).>
P1574 Key IMM Circuit Failure <Ref. to IM-19, DTC P1574 KEY COMMUNICATION FAILURE, Diagnostics
Procedure with Diagnostic Trouble Code (DTC).> DTC Item NOTE

EN(H4SO)-77
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1576 EGI Control Module EEPROM <Ref. to IM-20, DTC P1576 EGI CONTROL MODULE EEPROM, Diagnos-
tics Procedure with Diagnostic Trouble Code (DTC).>
P1577 IMM Control Module EEPROM <Ref. to IM-20, DTC P1577 IMM CONTROL MODULE EEPROM, Diagnos-
tics Procedure with Diagnostic Trouble Code (DTC).>
P1698 Engine Torque Control Cut Signal
Circuit Malfunction (Low Input)<Ref. to EN(H4SO)-247, DTC P1698 ENGINE TORQUE CONTROL CUT
SIGNAL CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1699 Engine Torque Control Cut Signal
Circuit Malfunction (High Input)<Ref. to EN(H4SO)-249, DTC P1699 ENGINE TORQUE CONTROL CUT
SIGNAL CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1700 Throttle Position Sensor Circuit Mal-
function For AT<Ref. to 4AT(H4SO)-41, DTC 31 THROTTLE POSITION SENSOR, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P1711 Engine Torque Control Signal #1 Cir-
cuit Malfunction<Ref. to EN(H4SO)-251, DTC P1711 ENGINE TORQUE CONTROL SIG-
NAL #1 CIRCUIT MALFUNCTION, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P1712 Engine Torque Control Signal #2 Cir-
cuit Malfunction<Ref. to EN(H4SO)-253, DTC P1712 ENGINE TORQUE CONTROL SIG-
NAL #2 CIRCUIT MALFUNCTION, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).> DTC Item NOTE

EN(H4SO)-78
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
EN-02384
B18
3412
56
B47F44
12345678
B136B135
1234
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
EE
B47
B18
6
4
5
3
2
1
B23 C13
C22C6 C17
C16
C5
8
B:
C:B135
B136
B21
E2 ECMBATTERY
B61F44
7
FRONT OXYGEN
(A/F) SENSOR MAIN RELAY
567
82 1
94
310
24
22 23251112131415
26 27
281617181920 21
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
LHDLHD
RHDRHD
4
3
1 2
B: C:

EN(H4SO)-79
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Start the engine, and warm-up the engine.
2) Turn the ignition switch to OFF.
3) Disconnect the connector from ECM and
front oxygen (A/F) sensor.
4) Measure the resistance of harness
between ECM and front oxygen (A/F) sensor
connector.
Connector & terminal
(B136) No. 6 — (B18) No. 3:
(B136) No. 17 — (B18) No. 3:Is the resistance less than 1
Ω?Go to step 2.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
2 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure the resistance of harness between
ECM and front oxygen (A/F) sensor connector.
Connector & terminal
(B136) No. 13 — (B18) No. 1:
(B136) No. 22 — (B18) No. 2:Is the resistance less than 1
Ω?Go to step 3.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
3 CHECK HARNESS BETWEEN MAIN RELAY
AND FRONT OXYGEN (A/F) SENSOR CON-
NECTOR.
Measure the resistance of harness between
main relay and front oxygen (A/F) sensor con-
nector.
Connector & terminal
(B47) No. 4 — (B18) No. 4:Is the resistance less than 1
Ω?Go to step 4.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
4 CHECK FRONT OXYGEN (A/F) SENSOR.
Measure the resistance between front oxygen
(A/F) sensor connector terminals.
Te r m i n a l s
No. 3 — No. 4:Is the resistance less than 5
Ω?Go to step 5.Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-40,
Front Oxygen (A/
F) Sensor.>
5 CHECK POOR CONTACT.
Check poor contact in ECM and front oxygen
(A/F) sensor connector. Is there poor contact in ECM or
front oxygen (A/F) sensor con-
nector?Repair poor con-
tact in ECM or
front oxygen (A/F)
sensor connector.Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-40,
Front Oxygen (A/
F) Sensor.>

EN(H4SO)-80
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
B: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
EN-02384
B18
3412
56
B47F44
12345678
B136B135
1234
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
EE
B47
B18
6
4
5
3
2
1
B23 C13
C22C6 C17
C16
C5
8
B:
C:B135
B136
B21
E2 ECMBATTERY
B61F44
7
FRONT OXYGEN
(A/F) SENSOR MAIN RELAY
567
82 1
94
310
24
22 23251112131415
26 27
281617181920 21
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
LHDLHD
RHDRHD
4
3
1 2
B: C:

EN(H4SO)-81
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0031 and
P0037 at the same time?Go to step 2.Go to step 5.
2 CHECK POWER SUPPLY TO FRONT OXY-
GEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from front oxygen
(A/F) sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between front oxygen
(A/F) sensor connector and engine ground.
Connector & terminal
(B18) No. 4 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 3.Repair the power
supply line.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
main relay and
front oxygen (A/F)
sensor connector
 Poor contact in
front oxygen (A/F)
sensor connector
 Poor contact in
main relay connec-
tor
3 CHECK GROUND CIRCUIT FOR ECM.
Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 5 — Chassis ground:
(B136) No. 16 — Chassis ground:Is the resistance less than 5
Ω?Go to step 4.Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and engine
ground terminal
 Poor contact in
ECM connector.
 Poor contact in
coupling connector
4 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of front oxygen (A/F) sensor
heater current using Subaru Select Monitor or
OBD-II general scan tool.
N
OTE:
 Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO)-29, Subaru Select Monitor.>
 OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the current more than 0.2 A? Repair poor con-
tact connector.
N
OTE:
In this case repair
the following:
 Poor contact in
front oxygen (A/F)
sensor connector
 Poor contact in
ECM connector.Go to step 5.
5 CHECK INPUT SIGNAL FROM ECM.
1) Start and idle the engine.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 6 (+) — Chassis ground (
−):
(B136) No. 17 (+) — Chassis ground (
−):Is the voltage less than 1 V? Go to step 7.Go to step 6.
6 CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 6 (+) — Chassis ground (
−):
(B136) No. 17 (+) — Chassis ground (
−):Is the voltage less than 1 V by
shaking the ECM harness and
connector while monitoring the
value of voltage meter?Repair the poor
contact in ECM
connector.Go to step 7.

EN(H4SO)-82
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK FRONT OXYGEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between front oxy-
gen (A/F) sensor connector terminals.
Te r m i n a l s
No. 3 — No. 4:Is the resistance less than 10
Ω?Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open or ground
short circuit in har-
ness between front
oxygen (A/F)
sensor and ECM
connector
 Poor contact in
front oxygen (A/F)
sensor connector
 Poor contact in
ECM connector.Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-47,
Fuel.> Step Check Yes No