Acura CSX. Instruction — page 110

YES

NO

YES

NO

YES

NO

YES

NO

11-114

PGM-FI System

2. Check for vacuum leaks at these parts:

• PCV valve
• PCV hose
• EVAP canister purge valve
• Throttle body
• Intake manifold
• Brake booster
• Brake booster hose
• Intake air duct

Go to step 3.

Repair or replace the part(s) with leaks, then

go to step 7.

3. Start the engine. Hold the engine speed at

3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

4. Check for these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in N, M/T in neutral
• All electrical loads off

5. Monitor the ENGINE SPEED in the DATA LIST with

the HDS, and hold the engine speed at 2,500 rpm.
Once the engine speed is met, hold the accelerator
pedal steady for more than 10 seconds.

Repeat step 5.

Go to step 6.

6. While holding the engine speed at 2,500 rpm, check

the MAF SENSOR in the DATA LIST with the HDS.

Check the engine valve clearances and adjust

them if needed; K20Z2 engine (see page 6-12),
K20Z3 engine (see page 6-14). If the valve
clearances are OK, replace the injectors (see page
11-219), then go to step 7.

Replace the MAF sensor/IAT sensor (see page

11-224), then go to step 7.

7. Turn the ignition switch to ON (II).

8. Reset the ECM/PCM with the HDS.

9. Do the ECM/PCM idle learn procedure (see page

11-310).

10. Start the engine. Hold the engine speed at

3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

11. Test-drive under these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 70 °C (158 °F)

• A/T in D, M/T in 4th
• Drive at a steady speed between 24

120 km/h

(15

75 mph) for 15 minutes

NOTE: DTC P0171 and/or P0172 may take up to
80 minutes of test driving to set. Using the HDS,
monitor or the air fuel feed back average (AF FB
AVE). If the AF FB AVE stays within 0.80

1.25,

there is no problem at this time.

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

Go to step 1.

Troubleshooting is complete. If any other

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

Ar e the par ts OK ?

Did the engine speed var y mor e than 100 r pm f r om
2,500 r pm?

Is ther e about 6.0

8.6 ( K 20Z 2 engine) or 5.7

8.3 ( K 20Z 3 engine) gm/ s?

Is DT C P017 1 or P017 2 indicated?

08/08/21 14:17:24 61SNR030_110_0114

SNR9AA7K72100090300FAAT00

DTC P0300:

DTC P0301:

DTC P0302:

DTC P0303:

DTC P0304:

Special Tools Required

YES

NO

YES

NO

YES

NO

11-115

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

• 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 hose, adapter 07MAJ-PY40120
• Oil pressure hose 07ZAJ-S5AA200

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 of the combination of P0301 through
P0304) 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 of the combination
of P0301 through P0304) will be stored. When the
misfire stops, the MIL will remain on.

• If any of the DTCs listed below are indicated at the

same time as the random misfire DTCs, troubleshoot
those DTCs first, then recheck for random misfire
DTCs:

P0101, P0102, P0103: Mass air flow (MAF) sensor
P0107, P0108: Manifold absolute pressure (MAP)
sensor
P0171, P0172: Fuel system
P0335, P0339: Crankshaft position (CKP) sensor
P0365, P0369: Camshaft position (CMP) sensor B
P0401 , P0404 , P0416 , P2413 : Exhaust gas
recirculation (EGR) system
P0506, P0507: Idle control system
P2646, P2647, P2648, P2649: VTEC system

: K20Z2 engine

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle without load (A/T in

P or N, M/T in neutral).

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

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

Go to step 9.

If the screen indicates PASSED, go to step 5. If

the screen indicates EXECUTING, keep idling 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, and/or CYL4 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)
• APP SENSOR

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

P0303, or P0304 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.

Does the scr een indicate F AILED?

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

Does the scr een indicate F AILED?

08/08/21 14:17:24 61SNR030_110_0115

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

11-116

PGM-FI System

8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3

MISFIRE, and/or CYL4 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 to LOCK (0).

10. Check the fuel quality.

Go to step 11.

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

then go to step 25.

11. Inspect the spark plugs (see page 4-21). 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)
• APP SENSOR

13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3

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

Go to step 14.

Go to step 25.

14. Check the fuel pressure (see page 11-325).

Go to step 15.

• If the fuel pressure is too high, replace the fuel

pressure regulator (see page 11-337), then go to
step 25.

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

pump, the fuel feed pipe, and the fuel filter. If
they are OK, replace the fuel pressure regulator
(see page 11-337), then go to step 25.

15. Start the engine. Hold the engine speed at

3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

16. Check for these conditions:

• Engine coolant temperature (ECT SENSOR 1)

above 80 °C (176 °F)

• A/T in P or N, M/T in neutral
• All electrical loads off

17. Monitor the ENGINE SPDEED in the DATA LIST

with the HDS, and hold the engine speed at
2,500 rpm. Once the engine speed is met, hold the
accelerator pedal steady for more than 10 seconds.

Repeat step 17.

Go to step 18.

18. While holding the engine speed at 2,500 rpm, check

the MAF SENSOR in the DATA LIST with the HDS.

Go to step 19.

Replace the MAF sensor/IAT sensor (see page

11-224), then go to step 25.

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

Is the quality good?

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

Is the f uel pr essur e OK ?

Did the engine speed var y mor e than 100 r pm f r om
2,500 r pm?

Is ther e about 6.0

8.6 ( K 20Z 2 engine) or

5.7

8.3 ( K 20Z 3 engine) gm/ s?

08/08/21 14:17:24 61SNR030_110_0116

01

YES

NO

YES

NO

YES

NO

11-117

07406-0020201 or
07MAJ-PY4011A and
07MAJ-PY40120

A
22 N·m
(2.2 kgf·m,
16 lbf·ft)

07406-0070301

B
07NAJ-P07010A

07ZAJ-S5AA200

19. Turn the ignition switch to LOCK (0).

20. Remove the cowl cover and the under cowl panel

(see page 20-163).

21. Remove the rocker arm oil pressure switch (A), and

attach the special tools as shown, then attach the
rocker arm oil pressure switch to the pressure
gauge attachment (B).

NOTE: Install the parts in the reverse order of
removal with a new O-ring.

22. Reconnect the rocker arm oil pressure switch 2P

connector.

23. Start the engine. Hold the engine speed at

3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.

24. Check the oil pressure at engine speeds of

1,000 rpm and 2,000 rpm.

Check for air in the fuel line, then go to step

25.

Inspect the VTEC system, then go to step 25.

25. Turn the ignition switch to ON (II).

26. Reset the ECM/PCM with the HDS.

27. Clear the CKP pattern with the HDS.

28. Do the ECM/PCM idle learn procedure (see page

11-310).

29. Do the CKP pattern learn procedure (see page 11-4).

30. 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)
• APP SENSOR

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

Check for poor connections or loose

terminals at the ignition coil(s), the injector(s), and
the ECM/PCM, then go to troubleshooting DTC
P0301, P0302, P0303, or P0304 (see page 11-118).

Go to step 32.

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

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

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 31,
go to the indicated DTC’s troubleshooting.

If the screen indicates FAILED, go to step 1

and recheck. If the screen indicates EXECUTING,
keep driving until a result comes on. If the screen
indicates OUT OF CONDITION, go to step 30.

Is the oil pr essur e below 49 kPa ( 0.5 kgf / cm ,
7 psi)?

Is DT C P0300, P0301, P0302, P0303, or P0304
indicated?

Does the scr een indicate PASSED?

2

08/08/21 14:17:25 61SNR030_110_0117

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