Fig. 307: DTC Troubleshooting Flow Chart (P154A)
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 A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS
SYSTEMS .
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P154A BATTERY SENSOR INTERNAL FAILURE
1. Problem verification:
ο‘
ο‘
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS , and wait 5 seconds.
ο‘
3. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P154A BATTERY SENSOR INTERNAL
FAILURE
Is DTC P154A indicated?
YES : REPLACE THE BATTERY SENSOR .
NO : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the battery sensor and the PCM.
DTC P1658: ETCS CONTROL RELAY ON MALFUNCTION
Fig. 308: DTC Troubleshooting Flow Chart (P1658)
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 A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS
SYSTEMS .
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P1658 ETCS CONTROL RELAY ON
MALFUNCTION
1. Problem verification:
ο‘
1. Turn the ignition switch to ON (II).
2. Do the ETCS TEST with the HDS.
ο‘
Is the RELAY circuit OK?
YES : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the ETCS control relay and the PCM.
NO : The failure is duplicated. Go to step 2.
2. ETCS control relay test:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Remove the ETCS control relay (A) from the under-dash fuse/relay box.
Fig. 309: Identifying ETCS Control Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
3. TEST THE ETCS CONTROL RELAY .
Is the ETCS control relay OK?
YES : The ETCS control relay is OK. Go to step 3.
NO : Replace the ETCS control relay, then do the repair verification .
3. Shorted wire check (ETCS RLY CL- 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 A (49P)
ο‘
4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ETCS control relay: disconnected
PCM connector A (49P): disconnected
Test circuit ETCS RLY CL-
Test point 1 PCM connector A (49P) No. 48 (PUR)
Test point 2 Body ground
Fig. 310: Checking Continuity Between PCM Connector A (49P) No. 48 (PUR) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Repair a short in the ETCS RLY CL- wire between the PCM (A48) and the throttle body, then do
the repair verification .
NO : The ETCS RLY CL- wire is OK. Go to step 4.
4. Shorted wire check (VBETCS line to power):
ο‘
1. Disconnect the following connector.
PCM connector C (49P)
ο‘
ο‘
2. Turn the ignition switch to ON (II).
3. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
ETCS control relay: disconnected
PCM connector A (49P): 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. 311: Measuring Voltage Between PCM Connector C (49P) No. 1 (YEL) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : Repair a short to power in the VBETCS wire between the PCM (C1) and the ETCS control relay,
then do the repair verification .
NO : The VBETCS wire is OK. 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 .
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
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
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