Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p1493 coil 1 egr "a" control circuit high

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p1493 coil 1 egr "a" control circuit high

NOTE:

For the diagnostic procedure, refer to DTC P1499. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0851 PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detects open or short circuit of EGR.

Judge as NG when the ECM output level differs from the actual terminal level.

2. COMPONENT DESCRIPTION

(1)	Engine control module (ECM)	(4)	Switch circuit	(6)	Main relay
(2)	Computer unit (CPU)	(5)	Battery voltage	(7)	EGR control valve
(3)	Detecting circuit

3. EXECUTION CONDITION

Secondary Parameters	Execution condition
Battery voltage	≥ 10.9 V
EGR drive signal	ON

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after the enable conditions have been established.

5. DIAGNOSTIC METHOD

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

Judgment Value

Malfunction Criteria	Threshold Value
EGR terminal current	≥ 6 A

Time Needed for Diagnosis: 2500 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Dtc p1494 coil 2 egr "a" control circuit low

NOTE:For the diagnostic procedure, refer to DTC P1498. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1498 COIL 4 EGR "A" CONTROL CIRCUIT LOW1. OUTLINE OF DIAGNOSISNOTE:For the detect ...

Dtc p1492 coil 1 egr "a" control circuit low

Other materials:

Disassembly
NOTE:• Attach a cloth to the end of driven shaft (on the frictional side of the thrust needle bearing) to prevent damage during disassembly or reassembly.• When replacing the coupling sleeve and synchronizer hub, replace them as a set. Because these must engage at the specified point, av ...