DTC Troubleshooting: P0045 (K20C1) - Honda Civic FC/FK 2016-2021

DTC Troubleshooting: P0045

DTC P0045: Turbocharger Wastegate Control Actuator Circuit Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description	Confirmed DTC	Pending DTC
P0045 Turbocharger Wastegate Control Actuator Circuit Malfunction

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode.

?2.	Clear the DTC with the HDS.

?3.	Start the engine.

?4.	Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?5.	Select the Electric Waste Gate in the INSPECTION MENU with the HDS.

?6.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC
P0045 Turbocharger Wastegate Control Actuator Circuit Malfunction

Is DTC P0045 indicated?


	YES

Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the turbocharger and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?

Shorted wire check (WGMTR1 line):

Shorted wire check (WGMTR1 line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS, and wait more than 1 minute.

?3.

Disconnect the following connectors.

Turbocharger 5P connector

PCM connector No. 1 (96P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (female terminals) No. 5:
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the WGMTR1 wire between PCM connector No. 1 terminal No. 5 and the turbocharger.?


	NO

The WGMTR1 wire is not shorted. Go to step 3.

Shorted wire check (WGMTR2 line):

Shorted wire check (WGMTR2 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (female terminals) No. 1:
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the WGMTR2 wire between PCM connector No. 1 terminal No. 10 and the turbocharger.?


	NO

The WGMTR2 wire is not shorted. Go to step 4.

Open wire check (WGMTR1 line):

Open wire check (WGMTR1 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (female terminals) No. 5:
Test point 2	PCM connector No. 1 (96P) No. 5

Is there continuity?


	YES

Go to step 5.


	NO

Repair an open in the WGMTR1 wire between PCM connector No. 1 terminal No. 5 and the turbocharger.?

Open wire check (WGMTR2 line):

Open wire check (WGMTR2 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (female terminals) No. 1:
Test point 2	PCM connector No. 1 (96P) No. 10

Is there continuity?


	YES

Go to step 6.


	NO

Repair an open in the WGMTR2 wire between PCM connector No. 1 terminal No. 10 and the turbocharger.?

Shorted wire check (WGMTR1 line to WGMTR2 line):

Shorted wire check (WGMTR1 line to WGMTR2 line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (female terminals) No. 1:
Test point 2	Turbocharger 5P connector (female terminals) No. 5:

Is there continuity?


	YES

Repair a short in the WGMTR1 wire to the WGMTR2 wire between PCM connector No. 1 terminals (No. 5, No. 10) and the turbocharger.?


	NO

Go to step 7.

Turbocharger wastegate control actuator internal circuit check (short in wires):

Turbocharger wastegate control actuator internal circuit check (short in wires)

?1.

At the turbocharger side, measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (male terminals) No. 1 (turbocharger side):
Test point 2	Turbocharger 5P connector (male terminals) No. 5 (turbocharger side):

Is there about 1.2 ??1.0 k??


	YES

Go to step 8.


	NO

Replace the turbocharger.?

Turbocharger wastegate control actuator internal circuit check (short to ground):

Turbocharger wastegate control actuator internal circuit check (short to ground)

?1.

At the turbocharger side, check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Turbocharger 5P connector: disconnected
	PCM connector No. 1 (96P): disconnected
Test point 1	Turbocharger 5P connector (male terminals) No. 1 (turbocharger side) and No. 5 (turbocharger side):
Test point 2	Body ground

Is there continuity?


	YES

Replace the turbocharger.?


	NO

The turbocharger wastegate control actuator internal circuit is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0045 goes away and the PCM was substituted, replace the original PCM.?