DTC P1659 (6-Speed A/T, 16-18 9-Speed A/T)

DTC P1659  : ETCS Control Relay OFF Malfunction

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

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 - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

2. Determine possible failure area (+B DBW or IG1M/IG1 (DBW) line, others)

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

   - 2. Check the following fuse.

   Fuse	No. A24 (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 

   The relay circuit board is OK. Go to step 4.

   NO 

   Replace the relay circuit board .

4. Open wire check (+B DBW line)

   - 1. Reinstall the relay circuit board without reconnecting relay circuit board connector B (16P).

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

   Test condition	Vehicle OFF (LOCK) mode
   	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 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. A24 (15 A) fuse and the relay circuit board. If the wire is OK, replace the under-hood fuse/relay box .

5. Open wire check (IG1M/IG1 (DBW) line)

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

   - 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 connector B (16P): disconnected
   	PCM connector C (51P): disconnected
   Test point 1	Relay circuit board connector B (16P) No. 3
   Test point 2	PCM connector C (51P) No. 4 - Refer to: PCM Connector for Inputs and Outputs (16-18, 9-Speed A/T), or PCM Connector for Inputs and Outputs (16-20 6-Speed A/T)

   Is there continuity?

   YES 

   The IG1M/IG1 (DBW) wire is OK. Go to step 6.

   NO 

   Repair an open in the IG1M/IG1 (DBW) wire between the PCM (C4) and the relay circuit board.

6. Open wire check (DBW RLY 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 connector B (16P): disconnected
   	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. 13 - Refer to: PCM Connector for Inputs and Outputs (16-18, 9-Speed A/T), or PCM Connector for Inputs and Outputs (16-20 6-Speed A/T)

   Is there continuity?

   YES 

   The DBW RLY wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (6-Speed A/T, 16-18 9-Speed A/T) .

   NO 

   Repair an open in the DBW RLY wire between the PCM (A13) and the relay circuit board.

7. Shorted wire check (IG1M/IG1 (DBW) line)

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

   - 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
   	Relay circuit board connector B (16P): disconnected
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 4 - Refer to: PCM Connector for Inputs and Outputs (16-20 6-Speed A/T), or PCM Connector for Inputs and Outputs (16-18, 9-Speed A/T)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the IG1M/IG1 (DBW) wire between the PCM (C4) and the relay circuit board. Also replace the No. A24 (15 A) fuse in the under-hood fuse/relay box.

   NO 

   The IG1M/IG1 (DBW) wire is 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
   	Relay circuit board connector B (16P): disconnected
   	PCM connector C (51P): 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. A24 (15 A) fuse in the under-hood fuse/relay box and the relay circuit board. If the wire is OK, replace the under-hood fuse/relay box . Also replace the No. A24 (15 A) fuse.

   NO 

   The +B DBW wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (6-Speed A/T, 16-18 9-Speed A/T), . Also replace the No. A24 (15 A) fuse in the under-hood fuse/relay box.