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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. Turn the ignition switch to LOCK (0).
4. Allow the engine to cool to 104 Β°F (40 Β°C) or less.
5. Start the engine, and let it idle until ECT SENSOR 1 goes up to about 158 Β°F (70 Β°C).
Current conditions
Signal
Values
Unit
ECT SENSOR 1
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6. Check the parameter(s) below with the HDS.
Threshold Current conditions
Signal
Values Unit Values
About 158 Β°F
About 70 Β°C
Unit
ECT SENSOR 2
Do the current condition(s) match the threshold?
YES : Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, go to step 1.
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM UPDATE
or PCM REMOVAL AND INSTALLATION . If any other Pending or Confirmed DTCs are indicated, go to
the indicated DTC's troubleshooting.
DTC P0128: COOLING SYSTEM MALFUNCTION
Fig. 51: DTC Troubleshooting Flow Chart (P0128)
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
P0128 COOLING SYSTEM MALFUNCTION
1. Radiator fan control command check:
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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 .
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3. Turn the blower switch off.
4. Check the parameter(s) below with the HDS.
Threshold Current conditions
Signal
Values Unit Values
Unit
FAN HIGH CTRL OFF
FAN LOW CTRL OFF
Are they OFF?
YES : Go to step 2.
NO : Wait until the FAN HIGH CTRL and the FAN LOW CTRL are off, then go to step 2.
2. Radiator fan operation check:
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1. Check the radiator fan operation.
Does the radiator fan keep running?
YES : Go to step 3.
NO : Wait until the FAN HIGH CTRL and FAN LOW CTRL are off, then go to step 4.
3. Radiator fan circuit and radiator fan relay check:
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1. Check the radiator fan circuit, and the radiator fan relay.
Is it OK?
YES : 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 : Repair the radiator fan circuit, and the radiator fan relay, then do the repair verification .
4. Problem verification:
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1. Let the engine cool until the coolant temperature is 104 Β°F (40 Β°C) or less.
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2. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ECT SENSOR 2
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3. Start the engine, and let it idle.
4. Let the engine idle until ECT SENSOR 1 goes up 40 Β°F (22 Β°C) or more from the recorded
temperature.
Current conditions
Signal
Values
Unit
ECT SENSOR 1
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5. Check ECT SENSOR 2 in the DATA LIST with the HDS.
Current conditions
Signal
Values
Unit
ECT SENSOR 2
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6. Compare the recorded value of ECT SENSOR 2 and the present value of ECT SENSOR 2.
Did temperature rise 13 Β°F (7 Β°C) or more?
YES : TEST THE THERMOSTAT and replace it if needed, then do the repair verification .
NO : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
ECT sensor 1, ECT sensor 2, and the PCM.
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 .
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3. Let the engine cool until the coolant temperature is between 21 Β°F (-6 Β°C) and 104 Β°F (40 Β°C).
4. DO THE PCM IDLE LEARN PROCEDURE .
5. Test-drive at a steady speed between 15-75 mph (25-120 km/h) for 10 minutes.
6. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0128 COOLING SYSTEM MALFUNCTION
Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
PASSED : 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.
FAILED : Go to step 1 and recheck. If the PCM was updated, replace the original PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE , then check the OBD STATUS again.
NOT COMPLETED : Meet the test condition, and check the OBD STATUS again.
DTC P0133: A/F SENSOR (SENSOR 1) MALFUNCTION/SLOW RESPONSE
Fig. 52: DTC Troubleshooting Flow Chart (P0133)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
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Before you troubleshoot, record all freeze data and any on-board
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
