Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 312
EN(H4DOTC)(diag)-472
General Diagnostic Table
ENGINE (DIAGNOSTICS)
*1: Check ignition coil and spark plug.
*2: Indicate the symptom occurring only in cold temperatures.
*3: Ensure secure installation.
*4: Check fuel injector, fuel pressure regulator and fuel filter.
*5: Inspect for air leak in air intake system.
6. Surging
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) Fuel injection parts (*4)
7) Electronic throttle control
8) Fuel pump and fuel pump relay
7. Spark knock
1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor
4) Knock sensor
5) Fuel injection parts (*4)
6) Fuel pump and fuel pump relay
8. After burning in exhaust system
1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor (*2)
4) Fuel injection parts (*4)
5) Fuel pump and fuel pump relay
Symptoms
Faulty parts
GENERAL DESCRIPTION
GD(H4DOTC)
Page
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . ..2
Diagnostic Trouble Code (DTC) Detecting Criteria . . . . . . . . ..11
GD(H4DOTC)-2
List of Diagnostic Trouble Code (DTC)
GENERAL DESCRIPTION
1. List of Diagnostic Trouble Code (DTC)
A: LIST
DTC
Item
Note
B1570
Antenna
<Ref. to GD(H4DOTC)-11, DTC B1570 ANTENNA, Diagnostic Trouble Code
(DTC) Detecting Criteria.>
B1571
Reference Code Incompatibility
B1572
IMM Circuit Failure (Except
Antenna Circuit)
B1574
Key Communication Failure
B1575
Incorrect Immobilizer Key
B1576
EGI Control Module EEPROM
B1577
IMM Control Module EEPROM
B1578
Meter Failure
P0011
Intake Camshaft Position - Timing
Over-Advanced or System Perfor-
mance (Bank 1)
P0014
Exhaust AVCS System 1 (Range/
Performance)
P0016
Crankshaft Position - Camshaft
Position Correlation (Bank1)
P0017
Crank and Cam Timing B System
Failure (Bank 1)
P0018
Crankshaft Position - Camshaft
Position Correlation (Bank2)
P0019
Crank and Cam Timing B System
Failure (Bank 2)
P0021
Intake Camshaft Position - Timing
Over-Advanced or System Perfor-
mance (Bank 2)
P0024
Exhaust AVCS System 2 (Range/
Performance)
P0030
HO2S Heater Control Circuit (Bank
1 Sensor 1)
P0031
HO2S Heater Control Circuit Low
(Bank 1 Sensor 1)
P0032
HO2S Heater Control Circuit High
(Bank 1 Sensor 1)
P0037
HO2S Heater Control Circuit Low
(Bank 1 Sensor 2)
GD(H4DOTC)-3
List of Diagnostic Trouble Code (DTC)
GENERAL DESCRIPTION
P0038
HO2S Heater Control Circuit High
(Bank 1 Sensor 2)
P0068
MAP/MAF - Throttle Position Cor-
relation
P0101
Mass or Volume Air Flow Circuit
Range/Performance
P0102
Mass or Volume Air Flow Circuit
Low Input
P0103
Mass or Volume Air Flow Circuit
High Input
P0107
Manifold Absolute Pressure/Baro-
metric Pressure Circuit Low Input
P0108
Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input
P0111
Intake Air Temperature Sensor
Range/Performance Problem
P0112
Intake Air Temperature Sensor 1
Circuit Low
P0113
Intake Air Temperature Sensor 1
Circuit High
P0116
Engine Coolant Temp. Sensor Cir-
cuit Range/Performance
P0117
Engine Coolant Temperature Cir-
cuit Low
P0118
Engine Coolant Temperature Cir-
cuit High
P0122
Throttle/Pedal Position Sensor/
Switch “A” Circuit Low
P0123
Throttle/Pedal Position Sensor/
Switch “A” Circuit High
P0125
Insufficient Coolant Temperature
for Closed Loop Fuel Control
P0128
Coolant Thermostat (Engine Cool-
ant Temperature Below Thermo-
stat Regulating Temperature)
P0131
O2 Sensor Circuit Low Voltage
(Bank 1 Sensor 1)
P0132
O2 Sensor Circuit High Voltage
(Bank 1 Sensor 1)
P0134
O2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 1)
P0137
O2 Sensor Circuit Low Voltage
(Bank 1 Sensor 2)
DTC
Item
Note
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