2004 SUBARU FORESTER engine

EN(H4SO)-71
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check that each
fuel injector emits operating sound. Use a
sound scope or apply a screwdriver to the
injector for this check.Does the fuel pump emit oper-
ating sound?Check the fuel
pressure. ME(H4SO)-30,
INSPECTION,
Fuel Pressure.>Go to step 2.
2 CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
fuel injector terminal and engine ground.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (
−):
#2 (E16) No. 2 (+) — Engine ground (
−):
#3 (E6) No. 2 (+) — Engine ground (
−):
#4 (E17) No. 2 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 3.Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
main relay and fuel
injector connector
 Poor contact in
main relay connec-
tor
 Poor contact in
coupling connector
 Poor contact in
fuel injector con-
nector
3 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and fuel injector connector.
Connector & terminal
#1 (B134) No. 34 — (E5) No. 1:
#2 (B134) No. 23 — (E16) No. 1:
#3 (B134) No. 22 — (E6) No. 1:
#4 (B134) No. 8 — (E17) No. 1:Is the resistance less than 1
Ω?Go to step 4.Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and fuel
injector connector
 Poor contact in
coupling connector
4 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
#1 (B134) No. 34 — Chassis ground:
#2 (B134) No. 23 — Chassis ground:
#3 (B134) No. 22 — Chassis ground:
#4 (B134) No. 8 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 5.Repair ground
short circuit in har-
ness between
ECM and fuel
injector connector.
5 CHECK EACH FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between each fuel
injector terminals.
Te r m i n a l s
No. 1 — No. 2:Is the resistance 5 — 20 Ω? Go to step 6.Replace the faulty
fuel injector.
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Inspection using
“General Diagnos-
tic Table” EN(H4SO)-255,
INSPECTION,
General Diagnos-
tic Table.>

EN(H4SO)-72
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
18.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC Item NOTE
P0030 HO2S Heater Control Circuit (Bank 1
Sensor 1) (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0031 HO2S Heater Control Circuit Low
(Bank 1 Sensor 1) LOW (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0032 HO2S Heater Control Circuit High
(Bank 1 Sensor 1) HIGH (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0037 HO2S Heater Control Circuit Low
(Bank 1 Sensor 2) LOW (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0038 HO2S Heater Control Circuit High
(Bank 1 Sensor 2) HIGH (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0068 Manifold Pressure Sensor Range/
Pe r fo r ma nc e RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0107 Manifold Absolute Pressure/Baro-
metric Pressure Circuit Low Input BAROMETRIC PRESSURE CIRCUIT LOW INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0108 Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input BAROMETRIC PRESSURE CIRCUIT HIGH INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0111 Intake Air Temperature Circuit
Range/Performance RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0112 Intake Air Temperature Circuit Low
Input CUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0113 Intake Air Temperature Circuit High
Input CUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0117 Engine Coolant Temperature Circuit
Low Input CIRCUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0118 Engine Coolant Temperature Circuit
High Input CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0121 Throttle/Pedal Position Sensor/
Switch “A” Circuit Range/Perfor-
mance SOR/SWITCH “A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
P0122 Throttle/Pedal Position Sensor/
Switch “A” Circuit Low Input SOR/SWITCH “A” CIRCUIT LOW INPUT, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0123 Throttle/Pedal Position Sensor/
Switch “A” Circuit High Input SOR/SWITCH “A” CIRCUIT HIGH INPUT, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0125 Insufficient Coolant Temperature For
Closed Loop Fuel Control ATURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0129 Barometric Pressure Too Low LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4SO)-73
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0130 O2 Sensor Circuit (Bank 1 Sensor 1) SOR 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0131 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 1) AGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0132 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 1) AGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0133 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 1) RESPONSE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0134 O
2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 1) DETECTED (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0137 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 2) AGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0138 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 2) AGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0139 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 2) RESPONSE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0171 System Too Lean (Bank 1) nostic Procedure with Diagnostic Trouble Code (DTC).>
P0172 System Too Rich (Bank 1) nostic Procedure with Diagnostic Trouble Code (DTC).>
P0301 Cylinder 1 Misfire Detected Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0302 Cylinder 2 Misfire Detected Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0303 Cylinder 3 Misfire Detected Diagnostic Procedure with Diagnostic Trouble Code (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) 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) INPUT (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0335 Crankshaft Position Sensor “A” Cir-
cuit “A” CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0336 Crankshaft Position Sensor “A” Cir-
cuit Range/Performance “A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0340 Camshaft Position Sensor “A” Circuit
(Bank 1 or Single Sensor) 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) CIRCUIT RANGE/PERFORMANCE (BANK 1 OR SINGLE SENSOR), Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0400 Exhaust Gas Recirculation Flow 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) BELOW THRESHOLD (BANK 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0458 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit Low 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 TROL SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0461 Fuel Level Sensor Circuit Range/Per-
formance RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0462 Fuel Level Sensor Circuit Low Input INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0463 Fuel Level Sensor Circuit High Input HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0464 Fuel Level Sensor Circuit Intermittent INTERMITTENT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0483 Cooling Fan Rationality Check CHECK, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0502 Vehicle Speed Sensor Circuit Low
Input LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0503 Vehicle Speed Sensor Intermittent/
Erratic/High HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0506 Idle Control System RPM Lower
Than Expected LOWER THAN EXPECTED, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0507 Idle Control System RPM Higher
Than Expected HIGHER THAN EXPECTED, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0512 Starter Request Circuit nostic Procedure with Diagnostic Trouble Code (DTC).>
P0513 Incorrect Immobilizer Key Procedure with Diagnostic Trouble Code (DTC).>
P0519 Idle Control System Malfunction
(Fail-Safe) TION (FAIL-SAFE), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0565 Cruise Control On Signal Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0604 Internal Control Module Random
Access Memory (RAM) Error READ ACCESS MEMORY (RAM) ERROR, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0691 Cooling Fan 1 Control Circuit Low LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0692 Cooling Fan 1 Control Circuit High HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0703 Torque Converter/Brake Switch “B”
Circuit SWITCH “B” CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0705 Transmission Range Sensor Circuit
(PRNDL Input) dure without Diagnostic Trouble Code (DTC).>
P0710 Transmission Fluid Temperature
Sensor Circuit tic Procedure with Diagnostic Trouble Code (DTC).>
P0716 Torque converter turbine speed sen-
sor 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 nostic Procedure with Diagnostic Trouble Code (DTC).>
P0726 Engine Speed Input Circuit Malfunc-
tion cedure with Diagnostic Trouble Code (DTC).>
P0731 Gear 1 Incorrect Ratio nostic Procedure with Diagnostic Trouble Code (DTC).>
P0732 Gear 2 Incorrect Ratio nostic Procedure with Diagnostic Trouble Code (DTC).>
P0733 Gear 3 Incorrect Ratio nostic Procedure with Diagnostic Trouble Code (DTC).>
P0734 Gear 4 Incorrect Ratio nostic Procedure with Diagnostic Trouble Code (DTC).>
P0741 Torque Converter Clutch Circuit Per-
formance or Stuck Off CIRCUIT PERFORMANCE OR STUCK OFF, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0743 Torque Converter Clutch Circuit Elec-
trical Procedure with Diagnostic Trouble Code (DTC).>
P0748 Pressure Control Solenoid “A” Elec-
trical nostic Procedure with Diagnostic Trouble Code (DTC).>
P0753 Shift Solenoid “A” Electrical with Diagnostic Trouble Code (DTC).>
P0758 Shift Solenoid “B” Electrical with Diagnostic Trouble Code (DTC).>
P0771 Low clutch timing solenoid nostic Procedure with Diagnostic Trouble Code (DTC).>
P0778 Pressure Control Solenoid “B” Elec-
trical Procedure with Diagnostic Trouble Code (DTC).>
P0785 Shift/Timing Solenoid tic Procedure with Diagnostic Trouble Code (DTC).>
P0851 Neutral Switch Input Circuit Low LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> or 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 HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0864 TCM Communication Circuit Range/
Pe r fo r ma nc e RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0865 TCM Communication Circuit Low LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0866 TCM Communication Circuit Low HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1110 Atmospheric Pressure Sensor Circuit
Malfunction (Low Input) SOR CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P1111 Atmospheric Pressure Sensor Circuit
Malfunction (High Input) SOR CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P1134 A/F Sensor Micro-Computer Problem PROBLEM, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1137 O
2 Sensor Circuit (Lambda= 1)
(Bank 1 Sensor 1) (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P1492 EGR Valve Signal #1 Circuit Malfunc-
tion (Low Input) 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) MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1494 EGR Valve Signal #2 Circuit Malfunc-
tion (Low Input) MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1495 EGR Valve Signal #2 Circuit Malfunc-
tion (High Input) MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1496 EGR Valve Signal #3 Circuit Malfunc-
tion (Low Input) MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1497 EGR Valve Signal #3 Circuit Malfunc-
tion (High Input) MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1498 EGR Valve Signal #4 Circuit Malfunc-
tion (Low Input) MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1499 EGR Valve Signal #4 Circuit Malfunc-
tion (High Input) MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P1510 ISC Solenoid Valve Signal #1 Circuit
Malfunction (Low Input) CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1511 ISC Solenoid Valve Signal #1 Circuit
Malfunction (High Input) CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1512 ISC Solenoid Valve Signal #2 Circuit
Malfunction (Low Input) CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1513 ISC Solenoid Valve Signal #2 Circuit
Malfunction (High Input) CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1514 ISC Solenoid Valve Signal #3 Circuit
Malfunction (Low Input) CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1515 ISC Solenoid Valve Signal #3 Circuit
Malfunction (High Input) CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1516 ISC Solenoid Valve Signal #4 Circuit
Malfunction (Low Input) CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1517 ISC Solenoid Valve Signal #4 Circuit
Malfunction (High Input) CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1518 Starter Switch Circuit Low Input INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1560 Back-Up Voltage Circuit Malfunction FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P1570 ANTENNA nostic Trouble Code (DTC).>
P1571 Reference Code Incompatibility nostics Procedure with Diagnostic Trouble Code (DTC).>
P1572 IMM Circuit Failure CIRCUIT), Diagnostics Procedure with Diagnostic Trouble Code (DTC).>
P1574 Key IMM Circuit Failure 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 tics Procedure with Diagnostic Trouble Code (DTC).>
P1577 IMM Control Module EEPROM tics Procedure with Diagnostic Trouble Code (DTC).>
P1698 Engine Torque Control Cut Signal
Circuit Malfunction (Low Input) SIGNAL CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1699 Engine Torque Control Cut Signal
Circuit Malfunction (High Input) SIGNAL CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1700 Throttle Position Sensor Circuit Mal-
function For AT nostic Procedure with Diagnostic Trouble Code (DTC).>
P1711 Engine Torque Control Signal #1 Cir-
cuit Malfunction NAL #1 CIRCUIT MALFUNCTION, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P1712 Engine Torque Control Signal #2 Cir-
cuit Malfunction 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 ERATION, Clear Memory Mode.> and Inspection Mode 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: