DTC P053B:00 [SKYACTIV-D 1.5]

id0102q2213000

DTC P053B:00

Blow-by heater relay control circuit low input

DETECTION CONDITION

•  With the following conditions met, the blow-by heater power supply voltage is continuously lower than the specification for 5 s.

MONITORING CONDITIONS

―  Battery voltage: 8 V or more

―  0.5 s have elapsed after the ignition was switched ON (engine off or on)

―  Blow-by heater relay controlled on

Diagnostic support note

•  This is an intermittent monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA is not available.

•  Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

•  Blow-by heater relay malfunction

•  Short to ground or open circuit in blow-by heater relay power supply circuit

―  Short to ground in wiring harness between ENGINE3 15 A fuse and blow-by heater relay terminal C

―  Short to ground in wiring harness between ENGINE3 15 A fuse and blow-by heater relay terminal A

―  ENGINE3 15 A fuse malfunction

―  Open circuit in wiring harness between main relay terminal D and blow-by heater relay terminal C

―  Open circuit in wiring harness between main relay terminal D and blow-by heater relay terminal A

•  Blow-by heater connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  Blow-by heater relay terminal D—Blow-by heater terminal A

―  Blow-by heater relay terminal D—PCM terminal 1P

•  PCM connector or terminals malfunction

•  Short to power supply in wiring harness between blow-by heater relay terminal E and PCM terminal 2W

•  Open circuit in wiring harness between the following terminals:

―  Blow-by heater relay terminal D—PCM terminal 1P

―  Blow-by heater relay terminal E—PCM terminal 2W

•  Blow-by heater malfunction

•  PCM malfunction

DTC P053B:00	Blow-by heater relay control circuit low input
DETECTION CONDITION	• With the following conditions met, the blow-by heater power supply voltage is continuously lower than the specification for 5 s. MONITORING CONDITIONS ― Battery voltage: 8 V or more ― 0.5 s have elapsed after the ignition was switched ON (engine off or on) ― Blow-by heater relay controlled on Diagnostic support note • This is an intermittent monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA is not available. • Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	• Blow-by heater relay malfunction • Short to ground or open circuit in blow-by heater relay power supply circuit ― Short to ground in wiring harness between ENGINE3 15 A fuse and blow-by heater relay terminal C ― Short to ground in wiring harness between ENGINE3 15 A fuse and blow-by heater relay terminal A ― ENGINE3 15 A fuse malfunction ― Open circuit in wiring harness between main relay terminal D and blow-by heater relay terminal C ― Open circuit in wiring harness between main relay terminal D and blow-by heater relay terminal A • Blow-by heater connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Blow-by heater relay terminal D—Blow-by heater terminal A ― Blow-by heater relay terminal D—PCM terminal 1P • PCM connector or terminals malfunction • Short to power supply in wiring harness between blow-by heater relay terminal E and PCM terminal 2W • Open circuit in wiring harness between the following terminals: ― Blow-by heater relay terminal D—PCM terminal 1P ― Blow-by heater relay terminal E—PCM terminal 2W • Blow-by heater malfunction • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the snapshot data on the repair order.	—	Go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT BLOW-BY HEATER RELAY • Switch the ignition off. • Remove the blow-by heater relay. (See RELAY LOCATION.) • Inspect the blow-by heater relay. (See RELAY INSPECTION.) • Is there any malfunction?	Yes	Replace the blow-by heater relay, then go to Step 11.
3		No	Go to the next step.
4	INSPECT BLOW-BY HEATER RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Blow-by heater relay is removed. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the following terminals (wiring harness-side): ― Blow-by heater relay terminal C ― Blow-by heater relay terminal A • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the ENGINE3 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • ENGINE3 15 A fuse—Blow-by heater relay terminal C • ENGINE3 15 A fuse—Blow-by heater relay terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Main relay terminal D—Blow-by heater relay terminal C • Main relay terminal D—Blow-by heater relay terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 11.
5	INSPECT BLOW-BY HEATER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the blow-by heater connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 11.
5		No	Go to the next step.
6	INSPECT BLOW-BY HEATER MONITOR CIRCUIT FOR SHORT TO GROUND • Blow-by heater relay is removed. • Verify that the blow-by heater connector is disconnected. • Inspect for continuity between blow-by heater relay terminal D (wiring harness-side) and body ground. • Is there continuity?	Yes	Disconnect the PCM connector and inspect the wiring harness for short to ground. • If the short to ground circuit could be detected in the wiring harness: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Blow-by heater relay terminal D—Blow-by heater terminal A • Blow-by heater relay terminal D—PCM terminal 1P If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • If the short to ground circuit could not be detected in the wiring harness: ― Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to Step 11.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 11.
7		No	Go to the next step.
8	INSPECT BLOW-BY HEATER RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Blow-by heater relay is removed. • Verify that the blow-by heater and PCM connectors are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the blow-by heater relay terminal E (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
8		No	Refer to the wiring diagram and verify whether or not there is a common connector between blow-by heater relay terminal E and PCM terminal 2W. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 11.
9	INSPECT BLOW-BY HEATER RELAY CIRCUIT FOR OPEN CIRCUIT • Blow-by heater relay is removed. • Verify that the blow-by heater and PCM connectors are disconnected. • Switch the ignition off. • Inspect for continuity between the following terminals (wiring harness-side): ― Blow-by heater relay terminal D—PCM terminal 1P ― Blow-by heater relay terminal E—PCM terminal 2W • Is there continuity?	Yes	Go to the next step.
9		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Blow-by heater relay terminal D—PCM terminal 1P • Blow-by heater relay terminal E—PCM terminal 2W If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to the next step.
10	INSPECT BLOW-BY HEATER • Inspect the blow-by heater. (See BLOW-BY HEATER INSPECTION [SKYACTIV-D 1.5].) • Is there any malfunction?	Yes	Replace the blow-by heater, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
10		No	Go to the next step.
11	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-D 1.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to the next step.
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
12		No	DTC troubleshooting completed.