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DTC Troubleshooting




Control System DTCs

DTC Troubleshooting: P1659

DTC P1659 : ETCS Control Relay OFF Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How To Troubleshoot The Fuel And Emissions Systems.

1. Problem verification:

Problem verification
-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

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

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 ETCS control relay and the ECM/PCM.

2. Determine possible failure area (VB ETCS line or +B_ETCS line, others):

Determine possible failure area (VB ETCS line or +B_ETCS line, others)
-1. Turn the ignition switch to LOCK (0).

-2. Check the following fuse.





Is the fuse OK?
-YES- Go to step 3.
-NO- Go to step 9.

3. ETCS control relay test:

ETCS control relay test
-1. Remove the ETCS control relay (A) from the under-dash fuse/relay box.





-2. Test the ETCS control relay Testing and Inspection.

Is the ETCS control relay OK?
-YES- The ETCS control relay is OK. Go to step 4.
-NO- Replace the ETCS control relay, then do the repair verification.

4. Determine possible failure area (under-dash fuse/relay box, others):

Determine possible failure area (under-dash fuse/relay box, others)
-1. Turn the ignition switch to ON (II).

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









Is there battery voltage?
-YES- Go to step 5.
-NO- Replace the under-dash fuse/relay box Service and Repair, then do the repair verification

5. Determine possible failure area (+B_ETCS line, others):

Determine possible failure area (+B_ETCS line, others)
-1. Measure the voltage between test points 1 and 2.









Is there battery voltage?
-YES- Go to step 7.
-NO- Go to step 6.

6. Open wire check (+B_ETCS line):

Open wire check (+B_ETCS line)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Measure the voltage between test points 1 and 2.









Is there battery voltage?
-YES- The +B_ETCS wire is OK. Replace the under-dash fuse/relay box, then do the repair verification.
-NO- Repair an open in the +B_ETCS wire between the No. A22 (15 A) fuse and the under-dash fuse/relay box, then do the repair verification.

7. Open wire check (VB ETCS, ETCS_RLY_OUT lines):

Open wire check (VB ETCS, ETCS_RLY_OUT lines)
-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The VB ETCS/ETCS_RLY_OUT wires are OK. Go to step 8.
-NO- Repair an open in the VB ETCS/ETCS_RLY_OUT wire between the ECM/PCM (C1) and the ETCS control relay, then do the repair verification.

8. Open wire check (ETCS_RLY_CL- line):

Open wire check (ETCS_RLY_CL- line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- The ETCS_RLY_CL- wire is OK. Update the ECM/PCM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM/PCM Service and Repair, then do the repair verification.
-NO- Repair an open in the ETCS_RLY_CL- wire between the ECM/PCM (A48) and the ETCS control relay, then do the repair verification.

9. Shorted wire check (VB ETCS, ETCS_RLY_OUT lines):

Shorted wire check (VB ETCS, ETCS_RLY_OUT lines)
-1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.





-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Repair a short in the VB ETCS/ETCS_RLY_OUT wire between the ECM/PCM (C1) and the ETCS control relay, then do the repair verification.
-NO- The VB ETCS/ETCS_RLY_OUT wires are OK. Go to step 10.

10. Determine possible failure area (+B_ETCS line, ECM/PCM):

Determine possible failure area (+B_ETCS line, ECM/PCM)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Go to step 11.
-NO- Update the ECM/PCM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM/PCM Service and Repair, then do the repair verification.

11. Shorted wire check (+B_ETCS line):

Shorted wire check (+B_ETCS line)
-1. Disconnect the following connector.





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









Is there continuity?
-YES- Repair a short in the +B_ETCS wire between the No. A22 (15 A) fuse and the under-dash fuse/relay box, then do the repair verification.
-NO- The +B_ETCS wire is OK. Update the ECM/PCM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM/PCM Service and Repair, then do the repair verification.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the ECM/PCM with the HDS How To Troubleshoot The Fuel And Emissions Systems.

-5. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.

-6. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1658 indicated?
-YES- Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM Service and Repair, then recheck. If the ECM/PCM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
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