REPAIR VERIFICATION
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 .
3. DO THE PCM IDLE LEARN PROCEDURE .
4. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1116 ECT SENSOR 1 CIRCUIT
RANGE/PERFORMANCE PROBLEM
Is DTC P1116 indicated?
YES : Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the 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.
DTC P1128: MAP SENSOR SIGNAL LOWER THAN EXPECTED
Fig. 283: DTC Troubleshooting Flow Chart (P1128)
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 .
Before you begin, check for poor connections or a blockage at the intake
air duct.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1128 MAP SENSOR SIGNAL LOWER THAN
EXPECTED
1. MAP sensor performance check:
1. Turn the ignition switch to ON (II).
2. Check the parameter(s) below with the HDS for 5 seconds.
Threshold
Values
Current conditions
Unit Values Unit
Signal
Less than 54.1 kPa
MAP SENSOR
1.61
V
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 2.
2. Problem verification:
1. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
2. 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.
3. Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °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
4. 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 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 2-2 and recheck.
REPAIR VERIFICATION (OBD STATUS CHECK)
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 .
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.
5. Test-drive under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °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
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
2024 Honda CR-V Owner's Manual
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