Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1658 ETCS CONTROL RELAY ON
MALFUNCTION
Is DTC P1658 indicated?
YES : Check for poor connections or loose terminals at the ETCS control relay and the PCM. If the PCM was
updated, substitute a known-good PCM See PCM REMOVAL AND INSTALLATION or PCM
UPDATE , then recheck. If the PCM was substituted, go to step 1.
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE . If any other Pending or Confirmed DTCs are
indicated, go to the indicated DTC's troubleshooting.
DTC P1659: ETCS CONTROL RELAY OFF MALFUNCTION
Fig. 312: DTC Troubleshooting Flow Chart (P1659)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and
review the general troubleshooting information See HOW TO TROUBLESHOOT
THE FUEL AND EMISSIONS SYSTEMS or HOW TO TROUBLESHOOT THE A/T
SYSTEM .
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1659 ETCS CONTROL RELAY OFF
MALFUNCTION
1. Problem verification:
ο‘
1. Turn the ignition switch to ON (II).
ο‘
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
3. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
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 ETCS control relay and the PCM.
2. Determine possible failure area (VBETCS line or +B ETCS line, others):
ο‘
1. Turn the ignition switch to LOCK (0).
2. Check the following fuse.
ο‘
Fuse No. A22 (15 A)
Location Under-hood fuse/relay box
Is the fuse OK?
YES : Go to step 3.
NO : Go to step 9.
3. ETCS control relay test:
ο‘
1. Remove the ETCS control relay (A) from the under-dash fuse/relay box.
Fig. 313: Identifying ETCS Control Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
2. TEST THE ETCS CONTROL RELAY .
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):
ο‘
ο‘
1. Turn the ignition switch to ON (II).
2. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
ETCS control relay: disconnected
Test circuit FI MAIN RLY OUT
Test point 1 ETCS control relay 4P socket No. 3 (Under-dash fuse/relay box)
Test point 2 Body ground
Fig. 314: Measuring Voltage Between ETCS Control Relay 4P Socket No. 3 (Under-Dash
Fuse/Relay Box) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : Go to step 5.
NO : REPLACE THE UNDER-DASH FUSE/RELAY BOX , then do the repair verification .
5. Determine possible failure area (+B ETCS line, others):
ο‘
1. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
ETCS control relay: disconnected
Test circuit +B ETCS
Test point 1 ETCS control relay 4P socket No. 1 (Under-dash fuse/relay box)
Test point 2 Body ground
Fig. 315: Measuring Voltage Between ETCS Control Relay 4P Socket No. 1 (Under-Dash
Fuse/Relay Box) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : Go to step 7.
NO : Go to step 6.
6. Open wire check (+B ETCS line):
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Disconnect the following connector.
Under-dash fuse/relay box connector D (32P)
3. Measure the voltage between test points 1 and 2.
Test condition IG LOCK (0)
ο‘
ETCS control relay: disconnected
Under-dash fuse/relay box connector D (32P): disconnected
Test circuit +B ETCS
Test point 1 Under-dash fuse/relay box connector D (32P) No. 5 (LT GRN)
Test point 2 Body ground
Fig. 316: Measuring Voltage Between Under-Dash Fuse/Relay Box Connector D (32P) No. 5
(LT GRN) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 (VBETCS/ETCS RLY OUT line):
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connector C (49P)
ο‘
4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ETCS control relay: disconnected
PCM connector C (49P): disconnected
Test circuit VBETCS/ETCS RLY OUT
Test point 1 PCM connector C (49P) No. 1 (YEL)
Test point 2 ETCS control relay 4P socket No. 2 (Under-dash fuse/relay box)
Fig. 317: Checking Continuity Between PCM Connector C (49P) No. 1 (YEL) And ETCS
Control Relay 4P Socket No. 2 (Under-Dash Fuse/Relay Box)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The VBETCS/ETCS RLY OUT wire is OK. Go to step 8.
NO : Repair an open in the VBETCS/ETCS RLY OUT wire between the PCM (C1) and the ETCS
control relay, then do the repair verification .
8. Open wire check (ETCS RLY CL- line):
ο‘
1. Disconnect the following connector.
PCM connector A (49P)
ο‘
2. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ETCS control relay: disconnected
PCM connector C (49P): disconnected
PCM connector A (49P): disconnected
Test circuit ETCS RLY CL-
Test point 1 PCM connector A (49P) No. 48 (PUR)
Test point 2 ETCS control relay 4P socket No. 4 (Under-dash fuse/relay box)
Fig. 318: Checking Continuity Between PCM Connector A (49P) No. 48 (PUR) And ETCS
Control Relay 4P Socket No. 4 (Under-Dash Fuse/Relay Box)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The ETCS RLY CL- wire is OK. Update the PCM See PCM UPDATE or PCM REMOVAL
AND INSTALLATION if it does not have the latest software, or substitute a known-good PCM See
PCM REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification .
NO : Repair an open in the ETCS RLY CL- wire between the PCM (A48) and the ETCS control relay,
then do the repair verification .
9. Shorted wire check (VBETCS/ETCS RLY OUT line):
ο‘
1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.
Fig. 319: Identifying ETCS Control Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
ο‘
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connector C (49P)
ο‘
4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ETCS control relay: disconnected
PCM connector C (49P): disconnected
Test circuit VBETCS
Test point 1 PCM connector C (49P) No. 1 (YEL)
Test point 2 Body ground
Fig. 320: Checking Continuity Between PCM Connector C (49P) No. 1 (YEL) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Repair a short in the VBETCS/ETCS RLY OUT wire between the PCM (C1) and the ETCS
control relay, then do the repair verification .
NO : The VBETCS/ETCS RLY OUT wire is OK. Go to step 10.
10. Determine possible failure area (+B ETCS line, PCM):
ο‘
1. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ETCS control relay: disconnected
PCM connector C (49P): disconnected
Test circuit +B ETCS
Test point 1 ETCS control relay 4P socket No. 1 (Under-dash fuse/relay box)
Test point 2 Body ground
Fig. 321: Checking Continuity Between ETCS Control Relay 4P Socket No. 1 (Under-Dash
Fuse/Relay Box) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Go to step 11.
NO : Update the PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does
not have the latest software, or substitute a known-good PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE , then do the repair verification .
11. Shorted wire check (+B ETCS line):
ο‘
1. Disconnect the following connector.
Under-dash fuse/relay box connector D (32P)
2. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ο‘
ETCS control relay: disconnected
PCM connector C (49P): disconnected
Under-dash fuse/relay box connector D (32P): disconnected
Test circuit +B ETCS
Test point 1 Under-dash fuse/relay box connector D (32P) No. 5 (LT GRN)
Test point 2 Body ground
Fig. 322: Checking Continuity Between Under-Dash Fuse/Relay Box Connector D (32P) No. 5
(LT GRN) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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. Check the under-dash fuse relay box, and REPLACE IT if needed, then
do the repair verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Reconnect all connectors.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1659 ETCS CONTROL RELAY OFF
MALFUNCTION
Is DTC P1659 indicated?
YES : Check for poor connections or loose terminals at the ETCS control relay and the PCM. If the PCM was
updated, substitute a known-good PCM See PCM REMOVAL AND INSTALLATION or PCM
UPDATE , then recheck. If the PCM was substituted, go to step 1.
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE . If any other Pending or Confirmed DTCs are
indicated, go to the indicated DTC's troubleshooting.
DTC P1683: THROTTLE VALVE DEFAULT POSITION SPRING
PERFORMANCE PROBLEM
2024 Honda CR-V Owner's Manual
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