Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 363
GD(H4DOTC)-204
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DR:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of neutral SW.
Judge as NG when there is no change in the neutral SW even if the driving shift was applied. (There is neutral
SW ON/OFF inversion from the vehicle speed and engine speed.)
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds after starting the engine.
4. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge NG when the malfunction criteria below are completed determined times or more after the neutral SW
change.
Time Needed for Diagnosis: 3 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear NG when there is change in the neutral SW.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Starter relay
OFF
Judgment Value
Malfunction Criteria
Threshold Value
Neutral switch signal (while changing from a to b below)
HIGH (OFF) continues.
Driving condition change
From a) to b)
a) Engine speed 600 rpm — 900 rpm & Vehicle speed = 0 km/h (0 MPH)
b) Engine speed 1600 rpm — 2550 rpm & Vehicle speed ≥ 64 km/h (39.8 MPH)
Judgment Value
Malfunction Criteria
Threshold Value
Neutral switch signal (while changing from a to b below)
Changes to LOW (ON).
Driving condition change
From a) to b)
a) Engine speed 600 rpm — 900 rpm & Vehicle speed = 0 km/h (0 MPH)
b) Engine speed 1600 rpm — 2550 rpm & Vehicle speed ≥ 64 km/h (39.8 MPH)
GD(H4DOTC)-205
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DS:DTC P1160 RETURN SPRING FAILURE
1. OUTLINE OF DIAGNOSIS
Judge as NG when the valve is opened more than the default opening angle, but does not move to the close
direction with the motor power stopped.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
• Ignition switch ON → OFF
• Ignition switch OFF → ON (Only after clearing memory)
(1)
Opener spring
(4)
Full closed stopper
(7)
DC motor
(2)
Return spring
(5)
Throttle valve
(8)
Main and sub throttle position sen-
sor
(3)
Intermediate stopper
(6)
Gear
Secondary Parameters
Enable Conditions
Battery voltage
≥ 6 V
Throttle position sensor
Normal
EN-04463
S S
(8)
(6)
(7)
(5)
(1)
(3)
(2)
(4)
GD(H4DOTC)-206
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 24 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 3400 ms
Judgment Value
Malfunction Criteria
Threshold Value
Opening variation after continuity is set to OFF
< 2 °
Judgment Value
Malfunction Criteria
Threshold Value
Opening variation after continuity is set to OFF
≥ 2 °
GD(H4DOTC)-207
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DT:DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT
LOW
1. OUTLINE OF DIAGNOSIS
Detect the open/short circuit of pressure control solenoid valve.
Judge as NG when ECM output level is different from actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
(A)
Atmospheric pressure
(B)
Shut-off valve
(C)
To fuel tank
(1)
Filter
(3)
Connector terminal
(5)
Valve
(2)
Coil
(4)
Diaphragm
Secondary Parameters
Enable Conditions
None
EN-01759
(1)
(2)
(3)
(4)
(5)
(A)
(B)
(C)
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