Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 359

GD(H4DOTC)-188

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

4. DIAGNOSTIC METHOD

• Exhaust gas temperature diagnosis
Abnormality Judgment

Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge

as NG when the following conditions are established.

Time Needed for Diagnosis: 14 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

cles.

Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: Less than 1 second
• Idle speed diagnosis
Abnormality Judgment

Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 7000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

cles.

Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: 7000 ms

Judgment Value

Malfunction Criteria

Threshold Value

Estimated exhaust gas temperature

< Value of Map 4

Map 4 (Models without SI-DRIVE)

Engine coolant tem-
perature at engine 
starting

–40 °C

(–40 °F)

–30 °C

(–22 °F)

–20 °C
(–4 °F)

–10 °C
(14 °F)

0 °C

(32 °F)

10 °C

(50 °F)

20 °C

(68 °F)

30 °C

(86 °F)

40 °C

(104 °F)

45 °C

(113 °F)

Threshold Value

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

Map 4 (Models with SI-DRIVE)

Engine coolant tem-
perature at engine 
starting

–40 °C

(–40 °F)

–30 °C

(–22 °F)

–20 °C
(–4 °F)

–10 °C
(14 °F)

0 °C

(32 °F)

10 °C

(50 °F)

20 °C

(68 °F)

30 °C

(86 °F)

40 °C

(104 °F)

45 °C

(113 °F)

Threshold Value

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

Judgment Value

Malfunction Criteria

Threshold Value

Estimated exhaust gas temperature

≥ Value of Map 4

Judgment Value

Malfunction Criteria

Threshold Value

Actual engine speed – Target engine 
speed

< – 125 rpm

Judgment Value

Malfunction Criteria

Threshold Value

Actual engine speed – Target engine 
speed

≥ – 125 rpm

GD(H4DOTC)-189

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

• Final ignition timing diagnosis
Abnormality Judgment

Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 7000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

cles.

Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: 7000 ms

DG:DTC P050B COLD START IGNITION TIMING PERFORMANCE

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P050A. <Ref. to GD(H4DOTC)-185, DTC P050A COLD START

IDLE AIR CONTROL SYSTEM PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>

Judgment Value

Malfunction Criteria

Threshold Value

Final ignition timing – ignition timing during CSERS*
*: Ignition timing during CSERS (Cold Start Emission Reduction Strategy) = 
Base ignition timing – retard amount

> Value of Map 5

Map 5

Engine coolant 
temperature

–40 °C

(–40 °F)

–30 °C

(–22 °F)

–20 °C
(–4 °F)

–10 °C
(14 °F)

0 °C

(32 °F)

10 °C

(50 °F)

20 °C

(68 °F)

30 °C

(86 °F)

40 °C

(104 °F)

50 °C

(122 °F)

60 °C

(140 °F)

Threshold 
Value

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

6 °CA

Judgment Value

Malfunction Criteria

Threshold Value

Final ignition timing – ignition timing during CSERS*
*: Ignition timing during CSERS (Cold Start Emission Reduction Strat-
egy) = Base ignition timing – retard amount

≤ Value of Map 5

GD(H4DOTC)-190

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DH:DTC P0560 SYSTEM VOLTAGE

1. OUTLINE OF DIAGNOSIS

Detect the open/short circuit of back-up power supply circuit.

Judge as NG when the backup power voltage is low.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 2500 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more

than the predetermined time.

Time Needed for Diagnosis: Less than 1 second

Secondary Parameters

Enable Conditions

None

 

Judgment Value

Malfunction Criteria

Threshold Value

Voltage of back-up power supply

Low

Battery voltage

≥ 10.9 V

Engine condition

After engine starting

Judgment Value

Malfunction Criteria

Threshold Value

Voltage of back-up power supply

High

Battery voltage

≥ 10.9 V

Engine condition

After engine starting

GD(H4DOTC)-191

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DI: DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY 

(RAM) ERROR

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of microcomputer (RAM).

When there is a problem in the main CPU normal RAM, or the sub CPU normal RAM, judge as NG. Judge

as OK when both are operating properly.

If it is possible to write data to the whole area of RAM in the initial routine, and is possible to read the same

data, it is judged as OK, and if not, NG.

2. ENABLE CONDITIONS

Diagnosis with the initial routine.

3. GENERAL DRIVING CYCLE

Perform the diagnosis as soon as the ignition switch is turned to ON.

4. DIAGNOSTIC METHOD

• Abnormality Judgment
Judge as NG when the following conditions are established.

Time Needed for Diagnosis: Less than 1 second

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: Less than 1 second

Secondary Parameters

Enable Conditions

None

 

Judgment Value

Malfunction Criteria

Threshold Value

Write the specified value into the RAM.

The written value can-
not be read.

Judgment Value

Malfunction Criteria

Threshold Value

Write the specified value into the RAM.

The written value can 
be read.