DTC Troubleshooting: P1658
DTC P1658: ETCS Control Relay ON Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P1658 ETCS Control Relay ON Malfunction
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Select the ETCS TEST in the INSPECTION MENU with the HDS.

  

Is the RELAY circuit OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
     
NO
     
     
     
The failure is duplicated. Go to step 2.
2.
Relay check:

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

?2.
Remove the ETCS control relay (A) from the under-hood fuse/relay box.


?3.
Test the ETCS control relay.

Is the relay OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Replace the ETCS control relay.?
3.
Shorted wire check (DBW RLY CL- line):

Shorted wire check (DBW RLY CL- line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
ETCS control relay: disconnected
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 19
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short in the DBW RLY CL- wire between the PCM (A19) and the ETCS control relay.?
     
NO
     
     
     
The DBW RLY CL- wire is OK. Go to step 4.
4.
Shorted wire check (VBDBW/DBW RLY OUT line to power):

Shorted wire check (VBDBW/DBW RLY OUT line to power)
?1.
Disconnect the following connector.
PCM connector C (51P)

?2.
Turn the vehicle to the ON mode.

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
ETCS control relay: disconnected
 
PCM connector A (51P): disconnected
 
PCM connector C (51P): disconnected
Test point 1
PCM connector C (51P) No. 2
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the VBDBW/DBW RLY OUT wire between the PCM (C2) and the ETCS control relay.?
     
NO
     
     
     
The VBDBW/DBW RLY OUT wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P1658 goes away and the PCM was updated, troubleshooting is complete. If DTC P1658 goes away and the PCM was substituted, replace the original PCM.?