Subaru Legacy IV (2008 year). Service manual — part 119
EN(H4SO)(diag)-79
Diagnostic Procedure for Subaru Select Monitor Communication
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY CIRCUIT.
Connect the SDI (Subaru Diagnosis Interface)
or general scan tool to data link connector.
Does SDI or general scan tool
turn ON?
Go to step 4.
Go to step 2.
2
CHECK POWER SUPPLY CIRCUIT.
Measure the voltage between data link connec-
tor and chassis ground.
Connector & terminal
(B40) No. 16 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 3.
Repair the power
supply circuit.
NOTE:
In this case, repair
the following item:
• Open or ground
short circuit of har-
ness between bat-
tery and data link
connector
• Blown out of fuse
(M/B No. 13)
3
CHECK HARNESS BETWEEN DATA LINK
CONNECTOR AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B40) No. 4 — Chassis ground:
(B40) No. 5 — Chassis ground:
Is the resistance less than 5
:? Repair the poor
contact of data link
connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and data link
connector
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
1) Disconnect the connectors from ECM,
TCM, ABS CM, VDC CM, airbag CM and body
integrated unit.
CAUTION:
When disconnecting the connector from air-
bag control module, always follow the pre-
cautions on AB section. <Ref. to AB-4,
CAUTION, General Description.>
2) Measure the resistance of harness between
ECM and data link connector.
Connector & terminal
(B136) No. 16 — (B40) No. 7:
Is the resistance less than 1
:? Go to step 5.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and data link
connector
5
CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
Measure the resistance between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 — Chassis ground:
Is the resistance 1 M
: or
more?
Repair the poor
contact in the ECM
or data link con-
nector.
Repair the ground
short circuit of har-
ness between
ECM and data link
connector.
EN(H4SO)(diag)-80
List of Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
19.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC
Item
Reference
P0026
Intake Valve Control Solenoid Circuit
Range/Performance (Bank 1)
<Ref. to EN(H4SO)(diag)-87, DTC P0026 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT RANGE/PERFORMANCE (BANK 1), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0028
Intake Valve Control Solenoid Circuit
Range/Performance (Bank 2)
<Ref. to EN(H4SO)(diag)-89, DTC P0028 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT RANGE/PERFORMANCE (BANK 2), Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0030
HO2S Heater Control Circuit (Bank 1
Sensor 1)
<Ref. to EN(H4SO)(diag)-91, DTC P0030 HO2S HEATER CONTROL CIR-
CUIT (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0031
HO2S Heater Control Circuit Low
(Bank 1 Sensor 1)
<Ref. to EN(H4SO)(diag)-93, DTC P0031 HO2S HEATER CONTROL CIR-
CUIT LOW (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0032
HO2S Heater Control Circuit High
(Bank 1 Sensor 1)
<Ref. to EN(H4SO)(diag)-95, DTC P0032 HO2S HEATER CONTROL CIR-
CUIT HIGH (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0037
HO2S Heater Control Circuit Low
(Bank 1 Sensor 2)
<Ref. to EN(H4SO)(diag)-97, DTC P0037 HO2S HEATER CONTROL CIR-
CUIT LOW (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0038
HO2S Heater Control Circuit High
(Bank 1 Sensor 2)
<Ref. to EN(H4SO)(diag)-99, DTC P0038 HO2S HEATER CONTROL CIR-
CUIT HIGH (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0068
MAP/MAF - Throttle Position Correla-
tion
<Ref. to EN(H4SO)(diag)-101, DTC P0068 MAP/MAF - THROTTLE POSI-
TION CORRELATION, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0076
Intake Valve Control Solenoid Circuit
Low (Bank 1)
<Ref. to EN(H4SO)(diag)-103, DTC P0076 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT LOW (BANK 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0077
Intake Valve Control Solenoid Circuit
High (Bank 1)
<Ref. to EN(H4SO)(diag)-105, DTC P0077 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT HIGH (BANK 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0082
Intake Valve Control Solenoid Circuit
Low (Bank 2)
<Ref. to EN(H4SO)(diag)-107, DTC P0082 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT LOW (BANK 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0083
Intake Valve Control Solenoid Circuit
High (Bank 2)
<Ref. to EN(H4SO)(diag)-109, DTC P0083 INTAKE VALVE CONTROL SOLE-
NOID CIRCUIT HIGH (BANK 2), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0101
Mass or Volume Air Flow Circuit
Range/Performance
<Ref. to EN(H4SO)(diag)-111, DTC P0101 MASS OR VOLUME AIR FLOW
CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0102
Mass or Volume Air Flow Circuit Low
Input
<Ref. to EN(H4SO)(diag)-113, DTC P0102 MASS OR VOLUME AIR FLOW
CIRCUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0103
Mass or Volume Air Flow Circuit High
Input
<Ref. to EN(H4SO)(diag)-115, DTC P0103 MASS OR VOLUME AIR FLOW
CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0107
Manifold Absolute Pressure/Baromet-
ric Pressure Circuit Low Input
<Ref. to EN(H4SO)(diag)-117, DTC P0107 MANIFOLD ABSOLUTE PRES-
SURE/BAROMETRIC PRESSURE CIRCUIT LOW INPUT, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
P0108
Manifold Absolute Pressure/Baromet-
ric Pressure Circuit High Input
<Ref. to EN(H4SO)(diag)-119, DTC P0108 MANIFOLD ABSOLUTE PRES-
SURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUT, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
EN(H4SO)(diag)-81
List of Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
P0111
Intake Air Temperature Sensor 1 Cir-
cuit Range/Performance
<Ref. to EN(H4SO)(diag)-121, DTC P0111 INTAKE AIR TEMPERATURE
SENSOR 1 CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0112
Intake Air Temperature Sensor 1 Cir-
cuit Low
<Ref. to EN(H4SO)(diag)-123, DTC P0112 INTAKE AIR TEMPERATURE
SENSOR 1 CIRCUIT LOW, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0113
Intake Air Temperature Sensor 1 Cir-
cuit High
<Ref. to EN(H4SO)(diag)-125, DTC P0113 INTAKE AIR TEMPERATURE
SENSOR 1 CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0117
Engine Coolant Temperature Circuit
Low
<Ref. to EN(H4SO)(diag)-127, DTC P0117 ENGINE COOLANT TEMPERA-
TURE CIRCUIT LOW, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0118
Engine Coolant Temperature Circuit
High
<Ref. to EN(H4SO)(diag)-129, DTC P0118 ENGINE COOLANT TEMPERA-
TURE CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0122
Throttle/Pedal Position Sensor/Switch
“A” Circuit Low
<Ref. to EN(H4SO)(diag)-131, DTC P0122 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “A” CIRCUIT LOW, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0123
Throttle/Pedal Position Sensor/Switch
“A” Circuit High
<Ref. to EN(H4SO)(diag)-133, DTC P0123 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “A” CIRCUIT HIGH, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0125
Insufficient Coolant Temperature for
Closed Loop Fuel Control
<Ref. to EN(H4SO)(diag)-135, DTC P0125 INSUFFICIENT COOLANT TEM-
PERATURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0126
Insufficient Engine Coolant Tempera-
ture for Stable Operation
<Ref. to EN(H4SO)(diag)-136, DTC P0126 INSUFFICIENT ENGINE COOL-
ANT TEMPERATURE FOR STABLE OPERATION, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0128
Coolant Thermostat (Engine Coolant
Temperature Below Thermostat Reg-
ulating Temperature)
<Ref. to EN(H4SO)(diag)-138, DTC P0128 COOLANT THERMOSTAT
(ENGINE COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING
TEMPERATURE), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0131
O2 Sensor Circuit Low Voltage (Bank
1 Sensor 1)
<Ref. to EN(H4SO)(diag)-139, DTC P0131 O2 SENSOR CIRCUIT LOW
VOLTAGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0132
O2 Sensor Circuit High Voltage (Bank
1 Sensor 1)
<Ref. to EN(H4SO)(diag)-141, DTC P0132 O2 SENSOR CIRCUIT HIGH
VOLTAGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0133
O2 Sensor Circuit Slow Response
(Bank 1 Sensor 1)
<Ref. to EN(H4SO)(diag)-143, DTC P0133 O2 SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0134
O2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 1)
<Ref. to EN(H4SO)(diag)-145, DTC P0134 O2 SENSOR CIRCUIT NO ACTIV-
ITY DETECTED (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0137
O2 Sensor Circuit Low Voltage (Bank
1 Sensor 2)
<Ref. to EN(H4SO)(diag)-147, DTC P0137 O2 SENSOR CIRCUIT LOW
VOLTAGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0138
O2 Sensor Circuit High Voltage (Bank
1 Sensor 2)
<Ref. to EN(H4SO)(diag)-149, DTC P0138 O2 SENSOR CIRCUIT HIGH
VOLTAGE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0139
O2 Sensor Circuit Slow Response
(Bank 1 Sensor 2)
<Ref. to EN(H4SO)(diag)-151, DTC P0139 O2 SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0140
O2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 2)
<Ref. to EN(H4SO)(diag)-153, DTC P0140 O2 SENSOR CIRCUIT NO ACTIV-
ITY DETECTED (BANK1 SENSOR2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0171
System Too Lean (Bank 1)
<Ref. to EN(H4SO)(diag)-155, DTC P0171 SYSTEM TOO LEAN (BANK 1),
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
DTC
Item
Reference
EN(H4SO)(diag)-82
List of Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
P0172
System Too Rich (Bank 1)
<Ref. to EN(H4SO)(diag)-156, DTC P0172 SYSTEM TOO RICH (BANK 1),
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0181
Fuel Temperature Sensor “A” Circuit
Range/Performance
<Ref. to EN(H4SO)(diag)-158, DTC P0181 FUEL TEMPERATURE SENSOR
“A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
P0182
Fuel Temperature Sensor “A” Circuit
Low Input
<Ref. to EN(H4SO)(diag)-160, DTC P0182 FUEL TEMPERATURE SENSOR
“A” CIRCUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0183
Fuel Temperature Sensor “A” Circuit
High Input
<Ref. to EN(H4SO)(diag)-162, DTC P0183 FUEL TEMPERATURE SENSOR
“A” CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0196
Engine Oil Temperature Sensor Cir-
cuit Range/Performance
<Ref. to EN(H4SO)(diag)-164, DTC P0196 ENGINE OIL TEMPERATURE
SENSOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0197
Engine Oil Temperature Sensor Low
<Ref. to EN(H4SO)(diag)-166, DTC P0197 ENGINE OIL TEMPERATURE
SENSOR LOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0198
Engine Oil Temperature Sensor High
<Ref. to EN(H4SO)(diag)-168, DTC P0198 ENGINE OIL TEMPERATURE
SENSOR HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0222
Throttle/Pedal Position Sensor/Switch
“B” Circuit Low
<Ref. to EN(H4SO)(diag)-170, DTC P0222 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “B” CIRCUIT LOW, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0223
Throttle/Pedal Position Sensor/Switch
“B” Circuit High
<Ref. to EN(H4SO)(diag)-172, DTC P0223 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “B” CIRCUIT HIGH, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0301
Cylinder 1 Misfire Detected
<Ref. to EN(H4SO)(diag)-173, DTC P0301 CYLINDER 1 MISFIRE
DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0302
Cylinder 2 Misfire Detected
<Ref. to EN(H4SO)(diag)-173, DTC P0302 CYLINDER 2 MISFIRE
DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0303
Cylinder 3 Misfire Detected
<Ref. to EN(H4SO)(diag)-173, DTC P0303 CYLINDER 3 MISFIRE
DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0304
Cylinder 4 Misfire Detected
<Ref. to EN(H4SO)(diag)-174, DTC P0304 CYLINDER 4 MISFIRE
DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0327
Knock Sensor 1 Circuit Low (Bank 1
or Single Sensor)
<Ref. to EN(H4SO)(diag)-180, DTC P0327 KNOCK SENSOR 1 CIRCUIT
LOW (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0328
Knock Sensor 1 Circuit High (Bank 1
or Single Sensor)
<Ref. to EN(H4SO)(diag)-182, DTC P0328 KNOCK SENSOR 1 CIRCUIT
HIGH (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0335
Crankshaft Position Sensor “A” Circuit <Ref. to EN(H4SO)(diag)-184, DTC P0335 CRANKSHAFT POSITION SEN-
SOR “A” CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0336
Crankshaft Position Sensor “A” Circuit
Range/Performance
<Ref. to EN(H4SO)(diag)-186, DTC P0336 CRANKSHAFT POSITION SEN-
SOR “A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0340
Camshaft Position Sensor “A” Circuit
(Bank 1 or Single Sensor)
<Ref. to EN(H4SO)(diag)-188, DTC P0340 CAMSHAFT POSITION SENSOR
“A” CIRCUIT (BANK 1 OR SINGLE SENSOR), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0341
Camshaft Position Sensor “A” Circuit
Range/Performance (Bank 1 or Single
Sensor)
<Ref. to EN(H4SO)(diag)-190, DTC P0341 CAMSHAFT POSITION SENSOR
“A” CIRCUIT RANGE/PERFORMANCE (BANK 1 OR SINGLE SENSOR),
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0400
Exhaust Gas Recirculation Flow
<Ref. to EN(H4SO)(diag)-192, DTC P0400 EXHAUST GAS RECIRCULATION
FLOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0420
Catalyst System Efficiency below
Threshold (Bank 1)
<Ref. to EN(H4SO)(diag)-194, DTC P0420 CATALYST SYSTEM EFFICIENCY
BELOW THRESHOLD (BANK 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
DTC
Item
Reference
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