Acura CSX. Instruction — page 65

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8-7

Low Oil Pressure Indicator Circuit Troubleshooting (Open)

ECM/PCM CONNECTOR B (44P)

OPSW
(YEL/RED)

OIL PRESSURE
SWITCH CONNECTOR

OPSW
(YEL/RED)

1. Connect the Honda Diagnostic System (HDS) to the

data link connector (DLC) (see step 2 on page 11-3).

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

3. Make sure the HDS communicates with the vehicle

and the engine control module (ECM)/powertrain
control module (PCM). If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).

4. Check for DTCs (see page 11-3). If a DTC is present,

diagnose, and repair the cause before continuing
with this test.

5. Check the OIL PRESSURE SWITCH in the PGM-FI

DATA LIST with the HDS.

Replace the gauge control module (tach)

(see page 22-277).

Go to step 6.

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

7. Check the oil pressure switch (see page 8-9).

Go to step 8.

Replace the oil pressure switch (see page 8-9).

8. Turn the ignition switch to ON (II), and jump the

SCS line with the HDS, then turn the ignition switch
to LOCK (0).

NOTE: This step must be done to protect the ECM/
PCM from damage.

9. Disconnect ECM/PCM connector B (44P) and the oil

pressure switch connector.

10. Check for continuity between ECM/PCM connector

terminal B7 and the oil pressure switch connector.

Update the ECM/PCM if it does not have the

latest software (see page 11-227), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original
ECM/PCM (see page 11-228).

Repair an open in the wire between the oil

pressure switch and ECM/PCM connector terminal
B7.

Terminal side of female terminals

Wire side of
female terminal

Is ON indicated?

Is the oil pr essur e switch OK ?

Is ther e continuity?

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8-8

Engine Lubrication

Low Oil Pressure Indicator Circuit Troubleshooting (Short)

OIL PRESSURE SWITCH CONNECTOR

OPSW
(YEL/RED)

1. Connect the Honda Diagnostic System (HDS) to the

data link connector (DLC) (see step 2 on page 11-3).

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

3. Make sure the HDS communicates with the vehicle

and the engine control module (ECM)/powertrain
control module (PCM). If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).

4. Check for DTCs (see page 11-3). If a DTC is present,

diagnose, and repair the cause before continuing
with this test.

5. Start the engine, and check the OIL PRESSURE

SWITCH in the PGM-FI DATA LIST with the HDS.

Replace the gauge control module (tach)

(see page 22-277).

Go to step 6.

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

7. Disconnect the oil pressure switch connector.

8. Start the engine, and check the OIL PRESSURE

SWITCH in the PGM-FI DATA LIST with the HDS.

Turn the ignition switch to LOCK (0), then go

to step 9.

Turn the ignition switch to LOCK (0), then go

to step 10.

9. Check the oil pressure switch (see page 8-9).

Do the oil pressure test (see page 8-10).

Replace the oil pressure switch (see page 8-9).

10. Turn the ignition switch to ON (II), and jump the

SCS line with the HDS, then turn the ignition switch
to LOCK (0).

NOTE: This step must be done to protect the ECM/
PCM from damage.

11. Disconnect ECM/PCM connector B (44P).

12. Check for continuity between the oil pressure

switch connector and body ground.

Repair a short to ground in the wire between

the oil pressure switch and ECM/PCM connector
terminal B7.

Update the ECM/PCM if it does not have the

latest software (see page 11-227), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original
ECM/PCM (see page 11-228).

Wire side of female terminal

Is OF F indicated?

Is OF F indicated?

Is the oil pr essur e switch OK ?

Is ther e continuity?

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8-9

8-9

Oil Pressure Switch Test

Oil Pressure Switch Replacement

A

B

C

B
18 N·m
(1.8 kgf·m, 13 lbf·ft)

A

1. Disconnect the oil pressure switch connector (A)

from the oil pressure switch (B).

2. Check for continuity between the positive terminal

(C) and the engine (ground). There should be
continuity with the engine stopped. There should
be no continuity with the engine running.

1. Disconnect the oil pressure switch connector (A),

then remove the oil pressure switch (B).

2. Remove any old liquid gasket from the switch and

the switch mounting hole.

3. Apply a very small amount of liquid gasket to the

oil pressure switch threads, then install the oil
pressure switch.

NOTE: Using too much liquid gasket may cause
liquid gasket to enter the oil passage or the end of
the new oil pressure switch.

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Engine Oil Temperature: 80 °C (176 °F)
Engine Oil Pressure:
At Idle:

70 kPa (0.7 kgf/cm , 10 psi) min.

At 3,000 rpm: 300 kPa (3.1 kgf/cm , 44 psi) min.

K20Z2 engine
Capacity
At Oil Change: 4.0 L (4.2 US qt)
At Oil Change including Filter: 4.2 L (4.4 US qt)
After Engine Overhaul: 5.3 L (5.6 US qt)
K20Z3 engine
Capacity
At Oil Change: 4.2 L (4.4 US qt)
At Oil Change including Filter: 4.4 L (4.6 US qt)
After Engine Overhaul: 5.5 L (5.8 US qt)

2

2

8-10

8-10

Engine Lubrication

Oil Pressure Test

Engine Oil Replacement

A

A
39 N·m
(4.0 kgf·m, 29 lbf·ft)

B

NOTE: If the oil pressure warning indicator stays on
with the engine running, check the engine oil level. If
the oil level is correct do the following test:

1. With the engine stopped, remove the oil pressure

switch (see page 8-9), then install an oil pressure
gauge (A).

2. Start the engine. Shut it off immediately if the

gauge registers no oil pressure. Repair the problem
before continuing.

3. Allow the engine to reach operating temperature

(fan comes on at least twice). The pressure should
be:

4. If the oil pressure is out of specifications, inspect

these items:

• Blocking of oil filter (see page 8-11).
• Blocking of oil screen.
• Inspect the oil pressure relief valve (see page

8-15).

• Inspect the oil pump (see page 8-17).

1. Warm up the engine.

2. Remove the drain bolt (A), and drain the engine oil.

3. Reinstall the drain bolt with a new washer (B).

4. Refill the engine with the recommended oil

(see page 3-2).

Do not overtighten.

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