DTC P1659: ETCS Control Relay OFF Malfunction (L4)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (L4) .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1659 ETCS Control Relay OFF Malfunction

   Is DTC P1659 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the relay circuit board (ETCS control relay circuit) 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.

2. Determine possible failure area (+B DBW or VBDBW/DBW RLY OUT line, others)

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

   - 2. Check the following fuse.

   Fuse	No. A22 (15 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Go to step 7.

3. Relay circuit board check

   -1. Remove and test the relay circuit board.

   Is the relay circuit board OK?

   YES 

   Go to step 4.

   NO 

   Replace the relay circuit board .

4. Open wire check (+B DBW line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   Test point 1	Relay circuit board connector B (16P) No. 2
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B DBW wire is OK. Go to step 5.

   NO 

   Repair an open in the +B DBW wire between the No. A22 (15 A) fuse and the relay circuit board. If needed, replace the under-hood fuse/relay box .

5. Open wire check (VBDBW/DBW RLY OUT line)

   -1. Jump the SCS line with the HDS.

   - 2. Disconnect the following connector.

   PCM connector C (51P)

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   	PCM connector C (51P): disconnected
   Test point 1	Relay circuit board connector B (16P) No. 3
   Test point 2	PCM connector C (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (L4) (2015-17) or PCM Connector for Inputs and Outputs (L4) (2018-19) .

   Is there continuity?

   YES 

   The VBDBW/DBW RLY OUT wire is OK. Go to step 6.

   NO 

   Repair an open in the VBDBW/DBW RLY OUT wire between the PCM (C10) and the relay circuit board.

6. Open wire check (DBW RLY CL- line)

   -1. Disconnect the following connector.

   PCM connector A (51P)

   - 2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   	PCM connector C (51P): disconnected
   	PCM connector A (51P): disconnected
   Test point 1	Relay circuit board connector B (16P) No. 1
   Test point 2	PCM connector A (51P) No. 18 - Refer to: PCM Connector for Inputs and Outputs (L4) (2015-17) or PCM Connector for Inputs and Outputs (L4) (2018-19) .

   Is there continuity?

   YES 

   The DBW RLY CL- wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (Without SH-AWD) , then recheck. If DTC P1659 goes away and the PCM was updated, troubleshooting is complete. If DTC P1659 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (Without SH-AWD) .

   NO 

   Repair an open in the DBW RLY CL- wire between the PCM (A18) and the relay circuit board.

7. Shorted wire check (VBDBW/DBW RLY OUT line)

   -1. Jump the SCS line with the HDS.

   - 2. Disconnect the following connectors.

   PCM connector C (51P)

   Relay circuit board connector B (16P)

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Relay circuit board connector B (16P): disconnected
   Test point 1	PCM connector C (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (L4) (2015-17) or PCM Connector for Inputs and Outputs (L4) (2018-19) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the VBDBW/DBW RLY OUT wire between the PCM (C10) and the relay circuit board. Also replace the No. A22 (15 A) fuse in the under-hood fuse/relay box.

   NO 

   The VBDBW/DBW RLY OUT wires are OK. Go to step 8.

8. Shorted wire check (+B DBW line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Relay circuit board connector B (16P): disconnected
   Test point 1	Relay circuit board connector B (16P) No. 2
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the +B DBW wire between the No. A22 (15 A) fuse and the relay circuit board. If needed, replace the under-hood fuse/relay box . Also replace the No. A22 (15 A) fuse in the under-hood fuse/relay box.

   NO 

   The +B DBW wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (Without SH-AWD) , then recheck. If DTC P1659 goes away and the PCM was updated, troubleshooting is complete. If DTC P1659 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (Without SH-AWD) . Also replace the No. A22 (15 A) fuse in the under-hood fuse/relay box.