Content .. 76 77 78 79 ..

Honda Ridgeline. Manual - part 78

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DTC P0125:

YES

11-76

PGM-FI System

DTC Troubleshooting (cont’d)

ECT Sensor 1 Malfunction/Slow

Response

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Start the engine, and let it idle for 5 minutes or

more.

2. Check ECT SENSOR 1 in the DATA LIST with the

HDS.

Go to step 9.

Go to step 3.

3. Allow the engine to cool to 104 °F (40 °C) or less.

4. Note the value of ECT SENSOR 1 and ECT

SENSOR 2 in the DATA LIST with the HDS.

5. Start the engine, and let it idle.

6. Let the engine idle until ECT SENSOR 1 goes up

49 °F (27 °C) or more from the recorded
temperature.

7. Note the value of ECT SENSOR 2 in the DATA LIST

with the HDS.

8. Compare ECT SENSOR 2 and the recorded

temperature.

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.

Test the thermostat (see page 10-4). If the

thermostat is OK, go to step 9. If you replaced the
thermostat, go to step 11.

9. Turn the ignition switch OFF.

10. Replace ECT sensor 1 (see page 11-201).

11. Turn the ignition switch ON (II).

12. Reset the PCM with the HDS.

13. Do the PCM idle learn procedure (see page 11-273).

14. Allow the engine to cool to the ambient

temperature.

15. Start the engine, and let it idle 20 minutes.

16. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at ECT sensor 1, ECT sensor 2, and the
PCM, then go to step 1.

Go to step 17.

17. Monitor the OBD STATUS for DTC P0125 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 16,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go to step 1. If the
screen indicates NOT COMPLETED, go to step 15.

Is about 10 °F (

12 °C) or less, or 4.45 V or mor e

indicated?

Did ECT SENSOR 2 change 17 °F ( 9.5 °C) or
mor e?

Is DT C P0125 indicated?

Does the scr een indicate PASSED?

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DTC P0128:

YES

11-77

Cooling System Malfunction

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Turn the blower switch OFF.

4. Turn the A/C switch OFF.

5. Check the FAN CTRL in the DATA LIST with the

HDS.

Go to step 6.

Wait until the FAN CTRL is off, then go to step

6. Check the radiator fan operation.

Check for symptoms in the cooling system. If

the cooling system is OK, go to step 20.

Go to step 7.

7. Let the engine cool until the coolant temperature is

104 °F (40 °C) or less.

8. Note the value of ECT SENSOR 1 and ECT

SENSOR 2 in the DATA LIST with the HDS.

9. Start the engine, and let it idle.

10. Let the engine idle until ECT SENSOR 1 goes up

49 °F (27 °C) or more from the recorded
temperature.

11. Check ECT SENSOR 2 in the DATA LIST with the

HDS.

12. Compare the recorded value of ECT SENSOR 2 and

the present value of ECT SENSOR 2.

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.

Test the thermostat (see page 10-4), then go

to step 13.

13. Turn the ignition switch ON (II).

14. Reset the PCM with the HDS.

15. Let the engine cool until the coolant temperature is

between 21 °F (

6 °C) and 104 °F (40 °C).

16. Do the PCM idle learn procedure (see page 11-273).

17. Test-drive at a steady speed between 15

75 mph

(24

120 km/h) for 10 minutes.

18. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at ECT sensor 1, ECT sensor 2, and the
PCM. then go to step 1.

Go to step 19.

19. Monitor the OBD STATUS for DTC P0128 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 18,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go to step 1. If the
screen indicates NOT COMPLETED, go to step 17.

(cont’d)

Is it OF F ?

Does the r adiator f an keep r unning?

Did temper atur e r ise 17 °F ( 9.5 °C) or mor e?

Is DT C P0128 indicated?

Does the scr een indicate PASSED?

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YES

11-78

PGM-FI System

DTC Troubleshooting (cont’d)

20. Update the PCM if it does not have the latest

software (see page 11-7), or substitute a known-
good PCM (see page 11-8).

21. Let the engine cool until the coolant temperature is

between 21 °F (

6 °C) and 104 °F (40 °C).

22. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.

23. Test-drive at a steady speed between 15

75 mph

(24

120 km/h) for 10 minutes.

24. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at ECT sensor 1, ECT sensor 2, and the
PCM. If the PCM was updated, substitute a known-
good PCM (see page 11-8), then go to step 21. If the
PCM was substituted, go to step 1.

Go to step 25.

25. Monitor the OBD STATUS for DTC P0128 in the

DTCs MENU with the HDS.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-205). If any other
Temporary DTCs or DTCs were indicated in step 24,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM. If the PCM was updated,
substitute a known-good PCM (see page 11-8), then
go to step 21. If the PCM was substituted, go to step
1. If the screen indicates NOT COMPLETED, go to
step 21.

Is DT C P0128 indicated?

Does the scr een indicate PASSED?

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DTC P0133:

DTC P0153:

YES

11-79

Rear A/F Sensor (Bank 1,

Sensor 1) Circuit Slow Response

Front A/F Sensor (Bank 2,

Sensor 1) Circuit Slow Response

NOTE:

• Before you troubleshoot, record all freeze data and

any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

• If DTC P0139 and/or P0159 is stored at the same time

as DTC P0133 and/or P0153 , troubleshoot DTC P0139
and/or P0159 first, then recheck for DTC P0133 and/
or P0153 .

• Information marked with an asterisk ( ) applies to the

front bank (Bank 2).

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.

4. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 176 °F (80 °C)

• Transmission in D position
• Drive the vehicle at 25 mph (40 km/h) or less for

5 minutes, then drive at a steady speed between
26

81 mph (41

130 km/h)

5. Monitor the OBD STATUS for DTC P0133 and/or

P0153 in the DTCs MENU with the HDS.

Go to step 6.

If the screen indicates PASSED, intermittent

failure, the system is OK at this time. Check for
poor connections or loose terminals at the A/F
sensor (Sensor 1) and the PCM. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 3 and recheck.

6. Turn the ignition switch OFF.

7. Replace the A/F sensor (Sensor 1) (see page

11-199).

8. Turn the ignition switch ON (II).

9. Reset the PCM with the HDS.

10. Do the PCM idle learn procedure (see page 11-273).

11. Start the engine. Hold the engine speed at

3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.

12. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 176 °F (80 °C)

• Transmission in D position
• Drive the vehicle at 25 mph (40 km/h) or less for

5 minutes, then drive at a steady speed between
26

81 mph (41

130 km/h)

13. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the A/F sensor (Sensor 1) and the PCM,
then go to step 1.

Go to step 14.

14. Monitor the OBD STATUS for DTC P0133 and/or

P0153 in the DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 13,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the A/F sensor
(Sensor 1) and the PCM, then go to step 1. If the
screen indicates EXECUTING, keep driving until a
result comes on. If the screen indicates OUT OF
CONDITION, go to step 12.

Does the scr een indicate F AILED?

Is DT C P0133 and/ or P0153 indicated?

Does the scr een indicate PASSED?

Content .. 76 77 78 79 ..