PASSED : Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the
indicated DTC's troubleshooting.
FAILED : Go to step 1 and recheck.
NOT COMPLETED : Meet the test condition, and check the OBD STATUS again.
DTC P1157: A/F SENSOR (SENSOR 1) AFS CIRCUIT HIGH VOLTAGE
Fig. 285: DTC Troubleshooting Flow Chart (P1157)
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 .
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1157 A/F SENSOR (SENSOR 1) AFS CIRCUIT HIGH
VOLTAGE
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‘
ο‘
3. Start the engine, and wait 1 minute.
4. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1157 A/F SENSOR (SENSOR 1) AFS CIRCUIT
HIGH VOLTAGE
Is DTC P1157 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 A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM.
2. Open wire check (AFS+ line):
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connectors.
A/F sensor (Sensor 1) 4P connector
PCM connector C (49P)
ο‘
4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
A/F sensor (Sensor 1) 4P connector: disconnected
PCM connector C (49P): disconnected
Test circuit AFS+
Test point 1 PCM connector C (49P) No. 39 (RED)
Test point 2 A/F sensor (Sensor 1) 4P connector No. 2 (RED)
Fig. 286: Checking Continuity Between PCM Connector C (49P) No. 39 (RED) And A/F
Sensor (Sensor 1) 4P Connector No. 2 (RED)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The AFS+ wire is OK. Go to step 3.
NO : Repair an open in the AFS+ wire between the PCM (C39) and the A/F sensor (Sensor 1), then do
the repair verification .
3. Open wire check (AFS- line):
ο‘
1. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
A/F sensor (Sensor 1) 4P connector: disconnected
PCM connector C (49P): disconnected
Test circuit AFS-
Test point 1 PCM connector C (49P) No. 40 (YEL)
Test point 2 A/F sensor (Sensor 1) 4P connector No. 2 (YEL)
Fig. 287: Checking Continuity Between PCM Connector C (49P) No. 40 (YEL) And A/F
Sensor (Sensor 1) 4P Connector No. 2 (YEL)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The AFS- wire is OK. Go to step 4.
NO : Repair an open in the AFS- wire between the PCM (C40) and the A/F sensor (Sensor 1), then do
the repair verification .
4. A/F sensor (Sensor 1) check (substitution):
ο‘
ο‘
ο‘
ο‘
1. Substitute a known-good A/F sensor (Sensor 1).
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
P1157 A/F SENSOR (SENSOR 1) AFS CIRCUIT
HIGH VOLTAGE
Is DTC P1157 indicated?
YES : The A/F sensor (Sensor 1) 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 .
NO : REPLACE THE ORIGINAL A/F SENSOR (SENSOR 1) , 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
P1157 A/F SENSOR (SENSOR 1) AFS CIRCUIT HIGH
VOLTAGE
Is DTC P1157 indicated?
YES : Check for poor connections or loose terminals at the A/F sensor (Sensor 1) 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 P1172: A/F SENSOR (SENSOR 1) CIRCUIT OUT OF RANGE HIGH
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
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2015 Honda CR-V Owner's Manual
