Acura RL. Manual - part 676

Is DTC P0141 and/or P0161* indicated?

YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F
sensor relay (LAF), and the PCM, then go to step 1.

NO - Go to step 27.

27. Monitor the OBD STATUS for DTC P0141 and/or P0161 * in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 26,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary
HO2S (Sensor 2), the A/F sensor relay (LAF), and the PCM, then go to step 1. If the screen indicates
NOT COMPLETED, keep idling until a result comes on.

28. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

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

Is DTC P0141 and/or P0161* indicated?

YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the A/F
sensor relay (LAF), and the PCM. If the PCM was updated, substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 30.

30. Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated
in step 29, go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary
HO2S (Sensor 2), the A/F sensor relay (LAF), and the PCM. If the PCM was updated, substitute a
known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go
to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0171: REAR BANK (BANK 1) FUEL SYSTEM TOO LEAN; DTC P0172: REAR BANK
(BANK 1) FUEL SYSTEM TOO RICH; DTC P0174: FRONT BANK (BANK 2) FUEL SYSTEM
TOO LEAN; DTC P0175: 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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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1. Check the fuel pressure (see FUEL PRESSURE TEST ).

Is the fuel pressure OK?

YES - Check the valve clearances and adjust them if needed (DTC P0172 and P0175 only). If the
valve clearances are OK, replace the injectors (see INJECTOR REPLACEMENT ), then go to step
2.

NO - Check these items: If the pressure is too high, replace the fuel pressure regulator (see FUEL
PRESSURE REGULATOR REPLACEMENT ), then go to step 2. If the pressure is too low, check
the fuel pump, the fuel feed pipe, and the fuel filter. If they are all OK, replace the fuel pressure
regulator (see FUEL PRESSURE REGULATOR REPLACEMENT ), 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 PCM IDLE LEARN PROCEDURE ).

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.

GENERAL TROUBLESHOOTING INFORMATION ).



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, P1173, 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

NOTE:

DTC P0171, P0172, P0174, and/or P0175 may take up to 80 minutes of
test driving to set. Using the HDS, monitor the long term fuel trim (LT

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Is DTC P0171, P0172, P0174, or P0175 indicated?

YES - Check for poor connections or loose terminals at the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the
indicated DTCs troubleshooting

DTC P0300: RANDOM MISFIRE AND SOME COMBINATION OF THE FOLLOWING:; DTC
P0301: NO. 1 CYLINDER MISFIRE DETECTED; DTC P0302: NO. 2 CYLINDER MISFIRE
DETECTED; DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED; DTC P0304: NO. 4
CYLINDER MISFIRE DETECTED; DTC P0305: NO. 5 CYLINDER MISFIRE DETECTED; DTC
P0306: NO. 6 CYLINDER MISFIRE DETECTED

Special Tools Required



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-S5AA200

FUEL TRIM) or the air fuel feed back average (AF FB AVE). If the long
term fuel trim/air fuel feed back average stays within 0.86-1.17, there is
no problem at this time.

NOTE:



Before you troubleshoot, record all freeze data and any on-board
snapshot, and review the general troubleshooting information (see
GENERAL TROUBLESHOOTING INFORMATION ).



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: Fuel system

P0335, P0339, P0385, P0389: Crankshaft position (CKP) sensor A/B

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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1. Clear the DTC with the HDS.

2. Start the engine, and let it idle without load (in Park or neutral).

3. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs

MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 8.

NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep driving
until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then
recheck.

4. 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.

Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or
CYL6 MISFIRE show misfire counts?

YES - Go to step 8.

NO - Go to step 5.

5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:



ENGINE SPEED



VSS



TP SENSOR A



CLV (calculated load value)



ECT SENSOR 1

6. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs

MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 8.

NO - 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 5 and recheck.

7. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE,

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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

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