DTC P1628:11 [i-ELOOP]

id130201000900

DTC P1628:11

DC-DC converter (i-ELOOP) system: power supply voltage low input

DETECTION CONDITION

•  An ignition off determination continues while the DC-DC converter (i-ELOOP) receives signals during a 5 s period from the PCM at intervals of less than 0.1 s.

FAIL-SAFE FUNCTION

•  Not applicable

POSSIBLE CAUSE

•  DC-DC converter (i-ELOOP) connector or terminals malfunction

•  Short to ground or open circuit in DC-DC converter (i-ELOOP) power supply circuit

―  Short to ground in wiring harness between IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H

―  C/U IG1 15 A fuse malfunction

―  Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H

•  Short to ground in wiring harness between electric load (such as start stop unit or non-genuine part) connected to C/U IG1 15 A fuse and C/U IG1 15 A fuse, or short to ground in electric load part

•  DC-DC converter (i-ELOOP) malfunction

DTC P1628:11	DC-DC converter (i-ELOOP) system: power supply voltage low input
DETECTION CONDITION	• An ignition off determination continues while the DC-DC converter (i-ELOOP) receives signals during a 5 s period from the PCM at intervals of less than 0.1 s.
FAIL-SAFE FUNCTION	• Not applicable
POSSIBLE CAUSE	• DC-DC converter (i-ELOOP) connector or terminals malfunction • Short to ground or open circuit in DC-DC converter (i-ELOOP) power supply circuit ― Short to ground in wiring harness between IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H ― C/U IG1 15 A fuse malfunction ― Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H • Short to ground in wiring harness between electric load (such as start stop unit or non-genuine part) connected to C/U IG1 15 A fuse and C/U IG1 15 A fuse, or short to ground in electric load part • DC-DC converter (i-ELOOP) malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	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.
1		No	Go to the next step.
2	INSPECT DC-DC CONVERTER (i-ELOOP) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Remove the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) • Disconnect the DC-DC converter (i-ELOOP) 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 5.
2		No	Go to the next step.
3	INSPECT DC-DC CONVERTER (i-ELOOP) POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the DC-DC converter (i-ELOOP) connector is disconnected. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Switch the ignition ON (engine off). • Measure the voltage at the DC-DC converter (i-ELOOP) terminal 1H (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
3		No	Inspect the C/U IG1 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H. 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 IG1 relay terminal C and DC-DC converter (i-ELOOP) terminal 1H. 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 5.
4	VERIFY WIRING HARNESS RELATED TO ELECTRIC LOAD PART CONNECTED TO C/U IG1 15 A FUSE • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Verify the wiring harness condition related to the electric load part connected to the C/U IG1 15 A fuse. • Is there any malfunction?	Yes	Repair or replace the malfunction part, then go to the next step.
4		No	Go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Reinstall the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Clear the DTC for the DC-DC converter (i-ELOOP) using the M-MDS. (See CLEARING DTC [i-ELOOP].) • Switch the ignition off. • Switch the ignition ON (engine on) and wait for 5 s or more. • Retrieve the DC-DC converter (i-ELOOP) DTCs using the M-MDS. (See DTC INSPECTION [i-ELOOP].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the DC-DC converter (i-ELOOP). (See DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].) Go to the next step.
5		No	Go to the next step.
6	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [i-ELOOP].)
6		No	DTC troubleshooting completed.