Subaru Legacy IV (2008 year). Manual - part 595

EN(H6DO)(diag)-353

General Diagnostic Table

ENGINE (DIAGNOSTICS)

22.General Diagnostic Table

A: INSPECTION

NOTE:
Malfunction of parts other than those listed is also possible. <Ref. to ME(H6DO)-85, Engine Trouble in Gen-
eral.>

Symptoms

Problem parts

1. Engine stalls during idling.

1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Ignition parts (*1)
4) Engine coolant temperature sensor (*2)
5) Crankshaft position sensor (*3)
6) Camshaft position sensor (*3)
7) Fuel injection parts (*4)

2. Rough idling

1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor (*2)
4) Ignition parts (*1)
5) Air intake system (*5)
6) Fuel injection parts (*4)
7) Electronic throttle control
8) Crankshaft position sensor (*3)
9) Camshaft position sensor (*3)
10) Oxygen sensor
11) Fuel pump and fuel pump relay

3. Engine does not return to idle.

1) Engine coolant temperature sensor
2) Electronic throttle control
3) Manifold absolute pressure sensor
4) Mass air flow and intake air temperature sensor
5) Accelerator pedal position sensor
6) Oil temperature sensor

4. Poor acceleration

1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Electronic throttle control
4) Fuel injection parts (*4)
5) Fuel pump and fuel pump relay
6) Engine coolant temperature sensor (*2)
7) Crankshaft position sensor (*3)
8) Camshaft position sensor (*3)
9) A/C switch and A/C cut relay
10) Engine torque control signal circuit
11) Ignition parts (*1)
12) Accelerator pedal position sensor
13) Oil temperature sensor

5. Engine stalls, engine sags or hesitates at acceleration.

1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor (*2)
4) Crankshaft position sensor (*3)
5) Camshaft position sensor (*3)
6) Purge control solenoid valve
7) Fuel injection parts (*4)
8) Electronic throttle control
9) Fuel pump and fuel pump relay

EN(H6DO)(diag)-354

General Diagnostic Table

ENGINE (DIAGNOSTICS)

*1: Check ignition coil and spark plug.
*2: Indicate the symptom occurring only in cold temperatures.
*3: Ensure the secure installation.
*4: Check the fuel injector and fuel pressure regulator.
*5: Inspect air leak in air intake system.

6. Surging

1) Mass air flow and intake air temperature sensor
2) Manifold absolute pressure sensor
3) Engine coolant temperature sensor (*2)
4) Crankshaft position sensor (*3)
5) Camshaft position sensor (*3)
6) Fuel injection parts (*4)
7) Electronic throttle control
8) Fuel pump and fuel pump relay

7. Spark knock

1) Mass air flow and intake air temperature sensor
2) Manifold absolute pressure sensor
3) Engine coolant temperature sensor
4) Knock sensor
5) Fuel injection parts (*4)
6) Fuel pump and fuel pump relay

8. After-burn in exhaust system

1) Mass air flow and intake air temperature sensor
2) Manifold absolute pressure sensor
3) Engine coolant temperature sensor (*2)
4) Fuel injection parts (*4)
5) Fuel pump and fuel pump relay

Symptoms

Problem parts

GD(H6DO)-2

List of Diagnostic Trouble Code (DTC)

GENERAL DESCRIPTION

1. List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Item

Index

P0011

Intake Camshaft Position - Timing 
Over-Advanced or System Perfor-
mance (Bank 1)

<Ref. to GD(H6DO)-10, DTC P0011 INTAKE CAMSHAFT POSITION - TIM-
ING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), Diagnos-
tic Trouble Code (DTC) Detecting Criteria.>

P0016

Crankshaft Position - Camshaft Posi-
tion Correlation (Bank1)

<Ref. to GD(H6DO)-12, DTC P0016 CRANKSHAFT POSITION - CAM-
SHAFT POSITION CORRELATION (BANK1), Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0018

Crankshaft Position - Camshaft Posi-
tion Correlation (Bank2)

<Ref. to GD(H6DO)-13, DTC P0018 CRANKSHAFT POSITION - CAM-
SHAFT POSITION CORRELATION (BANK2), Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0021

Intake Camshaft Position - Timing 
Over-Advanced or System Perfor-
mance (Bank 2)

<Ref. to GD(H6DO)-13, DTC P0021 INTAKE CAMSHAFT POSITION - TIM-
ING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 2), Diagnos-
tic Trouble Code (DTC) Detecting Criteria.>

P0026

Intake Valve Control Solenoid Circuit 
Range/Performance (Bank 1)

<Ref. to GD(H6DO)-14, DTC P0026 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT RANGE/PERFORMANCE (BANK 1), Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0028

Intake Valve Control Solenoid Circuit 
Range/Performance (Bank 2)

<Ref. to GD(H6DO)-16, DTC P0028 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT RANGE/PERFORMANCE (BANK 2), Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0030

HO2S Heater Control Circuit 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-17, DTC P0030 HO2S HEATER CONTROL CIRCUIT 
(BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0031

HO2S Heater Control Circuit Low 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-19, DTC P0031 HO2S HEATER CONTROL CIRCUIT 
LOW (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0032

HO2S Heater Control Circuit High 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-21, DTC P0032 HO2S HEATER CONTROL CIRCUIT 
HIGH (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0037

HO2S Heater Control Circuit Low 
(Bank 1 Sensor 2)

<Ref. to GD(H6DO)-23, DTC P0037 HO2S HEATER CONTROL CIRCUIT 
LOW (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0038

HO2S Heater Control Circuit High 
(Bank 1 Sensor 2)

<Ref. to GD(H6DO)-25, DTC P0038 HO2S HEATER CONTROL CIRCUIT 
HIGH (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0050

HO2S Heater Control Circuit 
(Bank 2 Sensor 1)

<Ref. to GD(H6DO)-26, DTC P0050 HO2S HEATER CONTROL CIRCUIT 
(BANK 2 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0051

HO2S Heater Control Circuit Low 
(Bank 2 Sensor 1)

<Ref. to GD(H6DO)-26, DTC P0051 HO2S HEATER CONTROL CIRCUIT 
LOW (BANK 2 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0052

HO2S Heater Control Circuit High 
(Bank 2 Sensor 1)

<Ref. to GD(H6DO)-26, DTC P0052 HO2S HEATER CONTROL CIRCUIT 
HIGH (BANK 2 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0057

HO2S Heater Control Circuit Low 
(Bank 2 Sensor 2)

<Ref. to GD(H6DO)-26, DTC P0057 HO2S HEATER CONTROL CIRCUIT 
LOW (BANK 2 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0058

HO2S Heater Control Circuit High 
(Bank 2 Sensor 2)

<Ref. to GD(H6DO)-26, DTC P0058 HO2S HEATER CONTROL CIRCUIT 
HIGH (BANK 2 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0068

MAP/MAF - Throttle Position Correla-
tion

<Ref. to GD(H6DO)-27, DTC P0068 MAP/MAF - THROTTLE POSITION 
CORRELATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0076

Intake Valve Control Solenoid Circuit 
Low (Bank 1)

<Ref. to GD(H6DO)-29, DTC P0076 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT LOW (BANK 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

GD(H6DO)-3

List of Diagnostic Trouble Code (DTC)

GENERAL DESCRIPTION

P0077

Intake Valve Control Solenoid Circuit 
High (Bank 1)

<Ref. to GD(H6DO)-30, DTC P0077 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT HIGH (BANK 1), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0082

Intake Valve Control Solenoid Circuit 
Low (Bank 2)

<Ref. to GD(H6DO)-30, DTC P0082 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT LOW (BANK 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0083

Intake Valve Control Solenoid Circuit 
High (Bank 2)

<Ref. to GD(H6DO)-30, DTC P0083 INTAKE VALVE CONTROL SOLENOID 
CIRCUIT HIGH (BANK 2), Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>

P0101

Mass or Volume Air Flow Circuit 
Range/Performance

<Ref. to GD(H6DO)-31, DTC P0101 MASS OR VOLUME AIR FLOW CIR-
CUIT RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting 
Criteria.>

P0102

Mass or Volume Air Flow Circuit Low 
Input

<Ref. to GD(H6DO)-33, DTC P0102 MASS OR VOLUME AIR FLOW CIR-
CUIT LOW INPUT, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0103

Mass or Volume Air Flow Circuit High 
Input

<Ref. to GD(H6DO)-34, DTC P0103 MASS OR VOLUME AIR FLOW CIR-
CUIT HIGH INPUT, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0107

Manifold Absolute Pressure/
Barometric Pressure Circuit Low Input

<Ref. to GD(H6DO)-35, DTC P0107 MANIFOLD ABSOLUTE PRESSURE/
BAROMETRIC PRESSURE CIRCUIT LOW INPUT, Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0108

Manifold Absolute Pressure/
Barometric Pressure Circuit High Input

<Ref. to GD(H6DO)-36, DTC P0108 MANIFOLD ABSOLUTE PRESSURE/
BAROMETRIC PRESSURE CIRCUIT HIGH INPUT, Diagnostic Trouble 
Code (DTC) Detecting Criteria.>

P0111

Intake Air Temperature Sensor 1 Circuit 
Range/Performance

<Ref. to GD(H6DO)-37, DTC P0111 INTAKE AIR TEMPERATURE SENSOR 
1 CIRCUIT RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) 
Detecting Criteria.>

P0112

Intake Air Temperature Sensor 1 Circuit 
Low

<Ref. to GD(H6DO)-39, DTC P0112 INTAKE AIR TEMPERATURE SENSOR 
1 CIRCUIT LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0113

Intake Air Temperature Sensor 1 Circuit 
High

<Ref. to GD(H6DO)-40, DTC P0113 INTAKE AIR TEMPERATURE SENSOR 
1 CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0117

Engine Coolant Temperature Circuit 
Low

<Ref. to GD(H6DO)-41, DTC P0117 ENGINE COOLANT TEMPERATURE 
CIRCUIT LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0118

Engine Coolant Temperature Circuit 
High

<Ref. to GD(H6DO)-42, DTC P0118 ENGINE COOLANT TEMPERATURE 
CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0122

Throttle/Pedal Position Sensor/
Switch “A” Circuit Low

<Ref. to GD(H6DO)-43, DTC P0122 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH “A” CIRCUIT LOW, Diagnostic Trouble Code (DTC) Detecting 
Criteria.>

P0123

Throttle/Pedal Position Sensor/
Switch “A” Circuit High

<Ref. to GD(H6DO)-44, DTC P0123 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH “A” CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detect-
ing Criteria.>

P0125

Insufficient Coolant Temperature for 
Closed Loop Fuel Control

<Ref. to GD(H6DO)-45, DTC P0125 INSUFFICIENT COOLANT TEMPERA-
TURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0126

Insufficient Engine Coolant Temperature 
For Stable Operation

<Ref. to GD(H6DO)-47, DTC P0126 INSUFFICIENT ENGINE COOLANT 
TEMPERATURE FOR STABLE OPERATION, Diagnostic Trouble Code 
(DTC) Detecting Criteria.>

P0128

Coolant Thermostat 
(Engine Coolant Temperature Below 
Thermostat Regulating Temperature)

<Ref. to GD(H6DO)-49, DTC P0128 COOLANT THERMOSTAT (ENGINE 
COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEM-
PERATURE), Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0131

O2 Sensor Circuit Low Voltage 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-51, DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE 
(BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0132

O2 Sensor Circuit High Voltage 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-53, DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE 
(BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

P0133

O2 Sensor Circuit Slow Response 
(Bank 1 Sensor 1)

<Ref. to GD(H6DO)-55, DTC P0133 O2 SENSOR CIRCUIT SLOW 
RESPONSE (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detect-
ing Criteria.>

DTC

Item

Index