EPS Symptom Troubleshooting - EPS indicator does not go off (With CAN Gateway)

1.

Problem verification:

Problem verification

?1.	Start the engine.

?2.	Check the EPS indicator.

Does the EPS indicator come on, then go off?


	YES

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.?


	NO

Go to step 2.

2.

DTC check (EPS control unit):

DTC check (EPS control unit)

?1.

Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame

Is DTC indicated?


	YES

Go to indicated DTC's troubleshooting.?


	NO

Go to step 3.

3.

Gauge control module operation check:

Gauge control module operation check

?1.	Do the gauge control module self-diagnostic function.

Is the gauge control module OK?


	YES

Go to step 4.


	NO

Replace the gauge control module.?

4.

DTC check (CAN gateway system):

DTC check (CAN gateway system)

?1.

Check for CAN gateway system DTCs with the HDS.

DTC Description	DTC

Is DTC indicated?


	YES

Go to indicated DTC's troubleshooting.?


	NO

Go to step 5.

5.

Fuse check 1:

Fuse check 1

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

?2.

Check the following fuse.

Fuse	No. A2-1 (70 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

The fuse is OK. Reinstall the fuse, then go to step 6.


	NO

Replace the fuse. If the fuse blows again, repair a short to ground in the No. A2-1 (70 A) fuse circuit.?

6.

Fuse check 2:

Fuse check 2

?1.

Check the following fuse.

Fuse	No. D34 (10 A)
Location	Under-dash fuse/relay box

Is the fuse OK?


	YES

The fuse is OK. Reinstall the fuse, then go to step 7.


	NO

Replace the fuse. Turn the vehicle to the ON mode, then to the OFF (LOCK) mode. If the fuse blows again, repair a short to ground in the No. D34 (10 A) fuse circuit.?

7.

Open wire check (IG1/IG1 VSA/ABS line):

Open wire check (IG1/IG1 VSA/ABS line)

?1.

Disconnect the following connector.

EPS control unit connector B (6P)

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	EPS control unit connector B (6P): disconnected
Test point 1	EPS control unit connector B (6P) No. 5
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1/IG1 VSA/ABS wire is OK. Go to step 8.


	NO

Repair an open in the wire between the under-dash fuse/relay box and the EPS control unit.?

8.

Open wire check (+B EPS line):

Open wire check (+B EPS line)

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

?2.

Disconnect the following connector.

EPS control unit connector A (2P)

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	EPS control unit connector A (2P): disconnected
	EPS control unit connector B (6P): disconnected
Test point 1	EPS control unit connector A (2P) No. 2
Test point 2	Body ground

Is there battery voltage?


	YES

The +B EPS wire is OK. Go to step 9.


	NO

Repair an open in the wire between the under-hood fuse/relay box and the EPS control unit.?

9.

Open wire check (GND line):

Open wire check (GND line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	EPS control unit connector A (2P): disconnected
	EPS control unit connector B (6P): disconnected
Test point 1	EPS control unit connector A (2P) No. 1
Test point 2	Body ground

Is there continuity?


	YES

The GND wire is OK. Go to step 10.


	NO

Repair an open in the wire between the EPS control unit and body ground (G202).?

10.

F-CAN circuit communication check:

F-CAN circuit communication check

?1.

Reconnect the following connectors.

EPS control unit connector A (2P)

EPS control unit connector B (6P)

?2.	Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

Which result is indicated?


	Gauge control module (Bus A) is Not Available

Go to step 11.


	EPS control unit (Bus B) is Not Available

Go to step 12.


	Gauge control module and EPS control unit are Available

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.?

11.

Open wire check (F-CAN A_H, F-CAN A_L lines):

Open wire check (F-CAN A_H, F-CAN A_L lines)

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

?2.

Disconnect the following connectors.

Gauge control module connector A (32P)

CAN gateway 12P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Gauge control module connector A (32P): disconnected
	CAN gateway 12P connector: disconnected
Test circuit 1
Test point 1	Gauge control module connector A (32P) No. 19
Test point 2	CAN gateway 12P connector (female terminals) No. 3:

Test circuit 2
Test point 1	Gauge control module connector A (32P) No. 20
Test point 2	CAN gateway 12P connector (female terminals) No. 9:

Is there continuity?


	YES

The F-CAN A_H and F-CAN A_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good gauge control module, then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module.?


	NO

Repair an open in the wire between the gauge control module and the CAN gateway.?

12.

Open wire check (F-CAN B_H, F-CAN B_L lines):

Open wire check (F-CAN B_H, F-CAN B_L lines)

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

?2.

Disconnect the following connectors.

EPS control unit connector B (6P)

CAN gateway 12P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	EPS control unit connector B (6P): disconnected
	CAN gateway 12P connector: disconnected
Test circuit 1
Test point 1	EPS control unit connector B (6P) No. 3
Test point 2	CAN gateway 12P connector (female terminals) No. 12:

Test circuit 2
Test point 1	EPS control unit connector B (6P) No. 1
Test point 2	CAN gateway 12P connector (female terminals) No. 5:

Is there continuity?


	YES

The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit, then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit.?


	NO

Repair an open in the wire between the EPS control unit and the CAN gateway.?