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1. Turn the ignition switch to ON (II).
2. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
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3. DO THE PCM IDLE LEARN PROCEDURE .
4. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan
comes on, then let it idle.
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5. Test-drive under these conditions:
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Engine coolant temperature (ECT SENSOR 1) above 158 Β°F (70 Β°C)
Engine speed at 1, 400 rpm or more
Transmission in D
Vehicle speed accelerated to 15 mph (24 km/h) or more under half throttle
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ENGINE SPEED
VEHICLE SPEED
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6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P1128 MAP SENSOR SIGNAL LOWER THAN EXPECTED
Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
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 P1129: MAP SENSOR SIGNAL HIGHER THAN EXPECTED
Fig. 284: DTC Troubleshooting Flow Chart (P1129)
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
P1129 MAP SENSOR SIGNAL HIGHER THAN
EXPECTED
1. Vacuum leak check:
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1. Check for vacuum leaks in these parts:
PCV valve
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PCV hose
EVAP canister purge valve
Throttle body
Intake manifold
Brake booster
Brake booster hose
Are there any vacuum leaks?
YES : Repair or replace the parts with vacuum leaks, then do the repair verification .
NO : Go to step 2.
2. MAP sensor performance check:
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1. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator
fan comes on, then let it idle.
ο‘
2. Check the parameter(s) below with the HDS for 5 seconds.
Threshold
Values
Current conditions
Unit Values Unit
Signal
More than 36.9 kPa
More than 1.1 V
MAP SENSOR
Did the value maintain the threshold for 5 seconds or more?
YES : REPLACE THE MAP SENSOR , then do the repair verification .
NO : Go to step 3.
3. Problem verification:
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1. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
2. Test-drive under these conditions:
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Engine coolant temperature (ECT SENSOR 1) above 158 Β°F (70 Β°C)
Engine speed between 1, 400-6, 800 rpm
Transmission in D
Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate
(with the throttle fully closed) for at least 2 seconds
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ENGINE SPEED
VEHICLE SPEED
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3. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P1129 MAP SENSOR SIGNAL HIGHER THAN EXPECTED
Does the HDS indicate FAILED?
YES : The failure is duplicated. REPLACE THE MAP SENSOR , then do the repair verification .
NO : If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT
COMPLETED, go to step 3-2 and recheck.
REPAIR VERIFICATION (OBD STATUS CHECK)
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1. Turn the ignition switch to ON (II).
2. 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‘
3. DO THE PCM IDLE LEARN PROCEDURE .
4. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan
comes on, then let it idle.
ο‘
5. Test-drive under these conditions:
ο¬
ο¬
ο¬
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Engine coolant temperature (ECT SENSOR 1) above 158 Β°F (70 Β°C)
Engine speed between 1, 400-6, 800 rpm
Transmission in D
Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the
throttle fully closed) for at least 2 seconds
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ENGINE SPEED
VEHICLE SPEED
ο‘
6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P1129 MAP SENSOR SIGNAL HIGHER THAN EXPECTED
Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
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.
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
