Content .. 81 82 83 84 ..

Honda Ridgeline. Manual - part 83

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DTC P0171:

DTC P0172:

DTC P0174:

DTC P0175:

YES

11-96

PGM-FI System

DTC Troubleshooting (cont’d)

Rear Bank (Bank 1) Fuel System

Too Lean

Rear Bank (Bank 1) Fuel System

Too Rich

Front Bank (Bank 2) Fuel System

Too Lean

Front Bank (Bank 2) Fuel System

Too Rich

NOTE:

• Before you troubleshoot, record all freeze data and

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

• If some of the DTCs listed below are stored at the

same time as DTC P0171, P0172, P0174, and/or
P0175, troubleshoot those DTCs first, then recheck for
P0171, P0172, P0174, and/or P0175.

P0107, P0108, P1128, P1129: Manifold absolute
pressure (MAP) sensor
P0133, P0153, P1172, P1174, P2195, P2197, P2237,
P2238, P2240, P2241, P2243, P2245, P2247, P2249,
P2251, P2252, P2254, P2255, P2627, P2628, P2630,
P2631, P2A00, P2A03: Air fuel ratio (A/F) sensor
(Sensor 1)
P0134, P0135, P0154, P0155: Air fuel ratio (A/F) sensor
(Sensor 1) heater
P0137, P0138, P0139, P0157, P0158, P0159, P2270,
P2271, P2272, P2273: Secondary HO2S (Sensor 2)
P0141, P0161: Secondary HO2S (Sensor 2) heater
P2646, P2647, P2648, P2649: VTEC system
P0401, P0404, P0406, P2413: Exhaust gas
recirculation (EGR) system
P2279: Intake air leakage

1. Check the fuel pressure (see page 11-288).

If you are troubleshooting DTC P0171 or

P0174, go to step 2. If you are troubleshooting DTC
P0172 or P0175, check the valve clearances, and
adjust if necessary. If the valve clearances are OK,
replace the injectors (see page 11-197), then go to
step 2.

Check these items:

• If the pressure is too high, replace the fuel

pressure regulator (see page 11-299), then go to
step 2.

• If the pressure is too low, check the fuel pump,

the fuel pressure regulator, the fuel filter, and the
fuel lines for restrictions, then go to step 2.

2. Turn the ignition switch ON (II).

3. Reset the PCM with the HDS.

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

5. 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.

6. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 158 °F (70 °C)

• Transmission in D position
• Drive at a steady speed between 25

55 mph

(40

88 km/h) for 5 minutes, then drive at a

steady speed between 15

75 mph

(24

120 km/h) for 15 minutes.

NOTE: DTC P0171, P0172, P0174, and/or P0175 may
take up to 40 minutes of test driving to set. Use the
HDS to monitor the LT FUEL TRIM for 15 minutes of
driving under the freeze data conditions. If the
value stays within 10 % of 1.0 (0.0 %), there is no
problem at this time.

Is the f uel pr essur e OK ?

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YES

11-97

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

Go to step 8.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

8. Check for poor connections or loose terminals at

the PCM.

Go to step 9.

Repair the connections or terminals, then step

9. Check the fuel quality.

Replace the injectors (see page 11-197), then

go to step 2.

Drain the fuel tank (see page 11-289), replace

the fuel, then go to step 2.

Is DT C P017 1, P017 2, P017 4, or P017 5
indicated?

Ar e the connections and ter minals OK ?

Is the f uel quality OK ?

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DTC P0300:

DTC P0301:

DTC P0302:

DTC P0303:

DTC P0304:

DTC P0305:

DTC P0306:

Special Tools Required

YES

11-98

PGM-FI System

DTC Troubleshooting (cont’d)

Random Misfire and Any

Combination of the Following:

No. 1 Cylinder Misfire Detected

No. 2 Cylinder Misfire Detected

No. 3 Cylinder Misfire Detected

No. 4 Cylinder Misfire Detected

No. 5 Cylinder Misfire Detected

No. 6 Cylinder Misfire Detected

• Pressure gauge adapter 07NAJ-P07010A
• A/T low pressure gauge w/panel 07406-0070301
• A/T pressure hose 07406-0020201
• A/T pressure hose, 2,210 mm 07MAJ-PY4011A
• A/T pressure adapter 07MAJ-PY40120
• Oil pressure hose 07ZAJ-S5A0200

NOTE:

• Before you troubleshoot, record all freeze data and

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

• If the misfire is frequent enough to trigger detection

of increased emissions during two consecutive
driving cycles, the MIL will come on, and DTC P0300
(and some combination of P0301 through P0306) will
be stored.

• If the misfire is frequent enough to damage the

catalyst, the MIL will blink whenever the misfire
occurs, and DTC P0300 (and some combination of
P0301 through P0306) will be stored. When the
misfire stops, the MIL will remain on.

• Troubleshoot the following DTCs first, if any of them

were stored along with the random misfire DTC(s):

P0107, P0108, P1128, P1129: Manifold absolute
pressure (MAP) sensor
P0171, P0172, P0174, P0175: Fuel system
P0335, P0339, P0385, P0389: Crankshaft position
(CKP) sensor A/B
P0506, P0507: Idle control system
P0340, P0344: Camshaft position (CMP) sensor
P2646, P2647, P2648, P2649: VTEC system
P0401, P0404, P0406, P2413: Exhaust gas
recirculation (EGR) system

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle without load.

4. Monitor the OBD STATUS for DTC P0301, P0302,

P0303, P0304, P0305, or P0306 in the DTCs MENU
with the HDS.

Go to step 9.

If the screen indicates PASSED, go to step 4. If

the screen indicates EXECUTING, let it idle until a
result comes on. If the screen indicates OUT OF
CONDITION, wait for several minutes, then recheck.

5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3

MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or
CYL6 MISFIRE in the DATA LIST for 10 minutes
with the HDS.

Go to step 9.

Go to step 6.

6. Test-drive the vehicle for several minutes in the

range of these recorded freeze data parameters:

• ENGINE SPEED
• VSS
• REL TP SENSOR
• CLV (calculated load value)
• GEAR POSITION
• ECT SENSOR 1

Does the scr een indicate F AILED?

Does CY L1 MISF IRE, CY L2 MISF IRE, CY L3
MISF IRE, CY L4 MISF IRE, CY L5 MISF IRE,
and/ or CY L6 MISF IRE show misf ir e counts?

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YES

11-99

7. Monitor the OBD STATUS for DTC P0301, P0302,

P0303, P0304, P0305, or P0306 in the DTCs MENU
with the HDS.

Go to step 9.

If the screen indicates PASSED, go to step 8. If

the screen indicates EXECUTING, keep driving until
a result comes on. If the screen indicates OUT OF
CONDITION, go to step 6 and recheck.

8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3

MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or
CYL6 MISFIRE in the DATA LIST for 10 minutes
with the HDS.

Go to step 9.

Intermittent failure, the system is OK at this

time.

9. Turn the ignition switch OFF.

10. Check the fuel quality.

Go to step 11.

Drain the tank, and fill it with a known-good

fuel, then go to step 20.

11. Inspect the spark plugs (see page 4-22). If the spark

plugs are fouled or worn, replace them.

12. Test-drive the vehicle for several minutes in the

range of these recorded freeze data parameters:

• ENGINE SPEED
• VSS
• REL TP SENSOR
• CLV (calculated load value)
• ECT SENSOR 1
• APP SENSOR

13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3

MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or
CYL6 MISFIRE in the DATA LIST for 10 minutes
with the HDS.

Go to step 14.

Go to step 20.

14. Check the fuel pressure (see page 11-288).

Go to step 15.

• If the pressure is too high, replace the fuel

pressure regulator (see page 11-299), then go to
step 20.

• If the pressure is too low, check the fuel pump,

the fuel feed lines, and the fuel filter. If they are
OK, replace the fuel pressure regulator (see page
11-299), then go to step 20.

15. Turn the ignition switch OFF.

(cont’d)

Does the scr een indicate F AILED?

Does CY L1 MISF IRE, CY L2 MISF IRE, CY L3
MISF IRE, CY L4 MISF IRE, CY L5 MISF IRE,
and/ or CY L6 MISF IRE show misf ir e counts?

Is the quality good?

Does CY L1 MISF IRE, CY L2 MISF IRE, CY L3
MISF IRE, CY L4 MISF IRE, CY L5 MISF IRE,
and/ or CY L6 MISF IRE show misf ir e counts?

Is the f uel pr essur e OK ?

Content .. 81 82 83 84 ..