DTC P1659: ETCS Control Relay OFF Malfunction

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
Information marked with an asterisk (*1) applies to '09-10 models and '11-12 models (M/T).
Information marked with an asterisk (*2) applies to '11-12 models (A/T).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1659 indicated?

YES: Go to step 4.

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.
Turn the ignition switch to LOCK (0).
Check the No. 52 DBW (ETCS) (15 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES: Go to step 6.

NO: Go to step 19.
Open the fuse access panel (A), then remove the ETCS control relay (B) from the under-dash fuse/relay box.

Fig 1: Identifying Fuse Access Panel & ETCS Control Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Test the ETCS control relay (see POWER RELAY TEST ).
Is the ETCS control relay OK?

YES: Go to step 8.

NO: Replace the ETCS control relay, then go to step 25.
Turn the ignition switch to ON (II).
Measure the voltage between ETCS control relay 4P connector terminal No. 3 and body ground.
Is there battery voltage?

YES: Go to step 10.

NO: Replace the under-dash fuse/relay box (see UNDER-DASH FUSE/RELAY BOX ), then go to step 24.

Fig 2: Checking Voltage Between ETCS Control Relay 4P Connector Terminal No. 3 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the voltage between ETCS control relay 4P connector terminal No. 2 and body ground.
Is there battery voltage?

YES: Go to step 11.

NO: Replace the under-dash fuse/relay box (see UNDER-DASH FUSE/RELAY BOX ), then go to step 24.

Fig 3: Checking Voltage Between ETCS Control Relay 4P Connector Terminal No. 2 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Connect ETCS control relay 4P connector terminal No. 1 to body ground with the jumper wire.

Fig 4: Connecting ETCS Control Relay 4P Connector Terminal No. 1 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminal C1 and body ground.
Is there continuity?

YES: Go to step 16.

NO: Repair open in the wire between the ECM/PCM (CD and the ETCS control relay, then go to step 25.

Fig 5: Checking Continuity Between ECM/PCM Connector Terminal C1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect ECM/PCM connector A (49P).
Connect ETCS control relay 4P connector terminal No. 4 to body ground with the jumper wire.

Fig 6: Connecting ETCS Control Relay 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminal A21 and body ground.
Is there continuity?

YES: Go to step 30.

NO: Repair open in the wire between the ECM/PCM (A21) and the ETCS control relay, then go to step 25.

Fig 7: Checking Continuity Between ECM/PCM Connector Terminal A21 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Open the fuse access panel (A), then remove the ETCS control relay (B) from the under-dash fuse/relay box.

Fig 8: Identifying Fuse Access Panel & ETCS Control Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C1 and body ground.
Is there continuity?

YES: Repair short in the wire between the ECM/PCM (C1) and the ETCS control relay, then go to step 25.

NO: Go to step 23.

Fig 9: Checking Continuity Between ECM/PCM Connector Terminal C1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ETCS control relay 4P connector terminal No. 2 and body ground.
Is there continuity?

YES: Replace the under-hood fuse/relay box (see UNDER-DASH FUSE/RELAY BOX ), then go to step 25.

NO: Go to step 30.

Fig 10: Checking Continuity Between ETCS Control Relay 4P Connector Terminal No. 2 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do ECM/PCM IDLE LEARN PROCEDURE .
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1659 indicated?

YES: Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to step 1.

NO: Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1659 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 (see SUBSTITUTING THE ECM/PCM ), then recheck. If the ECM/PCM was substituted, go to step 1.

NO: If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.