1997 ACURA NSX engine oil

Oil Pum p
Removal/lnspection/lnstallatio n
1. Drai n th e engine oil.
2 . Remov e th e timin g bel t (se e pag e 6-15 ).
3 . Remov e th e dipstic k an d th e pipe .
4. Remov e th e oi l filte r assembly .
5. Remov e th e fron t exhaus t manifol d (M/ T se e pag e
6-24).
6 . Remov e th e oi l pan .
7 . Remov e th e oi l screen .
8 . Remov e th e baffl e plate .
9 . Remov e th e oi l pas s pip e an d th e joint .
10. Remov e th e mountin g bolt s an d th e oi l pum p
assembly . 11
. Remov e th e nin e screw s fro m th e pum p housing ,
the n separat e th e housin g an d cover .
12 . Chec k th e inner-to-oute r roto r radia l clearance .
Inner-to-Oute r Roto r Radia l Clearanc e
Standard (New) : 0.0 5-0.2 1 m m
(0.00 2-0.00 8 in )
Servic e Limit : 0.2 3 m m (0.00 9 in )
Replace .OIL PUM P
O-RING S
Replace .
OI L SCREE N
BAFFLE PLAT E
OI L PAS S PIP E
AND JOIN T
OUTE R ROTO R
13. Chec k th e housing-to-roto r axia l clearance .
Housing-to-Roto r Axia l Clearanc e
Standar d (New) : 0.0 2-0.0 7 m m
(0.00 1-0.00 3 in )
Servic e Limit : 0.1 2 m m (0.00 5 in )
OUTE R ROTO R
PUMP HOUSIN G
INNER ROTO R
ProCarManuals.com

EXPANSION TAN K
Refillin g an d bleeding , pag e 10- 5
Lea k Test , pag e 10- 8
ENGINE OI L
COOLE R PIP E
AUTOMATI C TRANSMISSIO N
FLUI D (ATF ) COOLE R
CAPTest , pag e 10- 8
ENGIN EOIL COOLE R
ProCarManuals.com

Troubleshooting

Engine Control Module Terminal Arrangement

ECM CONNECTOR A (26P)

ECM CONNECTOR A (26P)
Wire side of female terminals

NOTE: Standard battery voltage is 12 V.

Terminal

number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

20

21

22

23

24

25

26
Wire

color

BRN

RED

BLU

BLK/YEL

GRN/BLK

GRN

BLU

RED/BLU

GRY

LTGRN

PNK

BLK

YEL/BLK

YEL

BLK/RED

WHT/BLU

ORN

PNK/BLU

RED/YEL

GRN/RED

ORN/BLK

BRN

BLK

BRN/BLK
Terminal name

INJ1 (No. 1 FUEL INJECTOR)

INJ2 (No. 2 FUEL INJECTOR)

INJ3 (No. 3 FUEL INJECTOR)

VSV (EVAP CONTROL CANIS-

TER VENT SHUT VALVE)

FLR1 (FUEL PUMP RELAY)

ESOL (EGR CONTROL

SOLENOID VALVE)

MIL (MALFUNCTION

INDICATOR LAMP)

ACC (A/C CLUTCH RELAY)

FS02SHTC (FRONT SEC-

ONDARY HEATED OXYGEN

SENSOR HEATER CONTROL)

RS02SHTC (REAR SEC-

ONDARY HEATED OXYGEN

SENSOR HEATER CONTROL)

IGN COIL1 (No. 1 IGNITION

COIL part of IGNITION

CONTROL MODULE)

PG1 (POWER GROUND)

IGP1 (POWER SOURCE)

INJ4 (No. 4 FUEL INJECTOR)

INJ5 (No. 5 FUEL INJECTOR)

INJ6 (No. 6 FUEL INJECTOR)

2WBS (EVAP BYPASS

SOLENOID VALVE)

IABCS (IAB CONTROL

SOLENOID VALVE)

PCS (EVAP PURGE CONTROL

SOLENOID VALVE)

FP02SHTC (FRONT PRIMARY

HEATED OXYGEN SENSOR

HEATER CONTROL)

RP02SHTC (REAR PRIMARY

HEATED OXYGEN SENSOR

HEATER CONTROL)

IGN COIL2 (No. 2 IGNITION

COIL part of IGNITION

CONTROL MODULE)

PG2 (POWER GROUND)

LG1 (LOGIC GROUND)
Description

Drives No. 1 fuel injector

Drives No. 2 fuel injector

Drives No. 3 fuel injector

Drives EVAP control canister vent

shut valve

Drives fuel pump relay

Drives EGR control solenoid

valve

Drives MIL

Drives A/C clutch relay

Drives front secondary heated

oxygen sensor heater

Drives rear secondary heated

oxygen sensor heater

Sends ignition pulse

Ground for the ECM power circuit

Power source for the ECM control

circuit

Drives No. 4 fuel injector

Drives No. 5 fuel injector

Drives No. 6 fuel injector

Drives EVAP bypass solenoid

valve

Drives IAB control solenoid valve

Drives EVAP purge control

solenoid valve

Drives front primary heated

oxygen sensor heater

Drives rear primary heated

oxygen sensor heater

Sends ignition pulse

Ground for the ECM power circuit

Ground for the ECM control

circuit
Signal

With engine running: pulses

With ignition switch ON (II):

battery voltage

0 V for two seconds after turning ignition

switch ON (II), then battery voltage

With EGR operating during driving with

fully warmed up engine: duty controlled

With EGR not operating: battery voltage

With MIL turned ON: 0V

With MIL turned OFF: battery voltage

With compressor ON: 0 V

With compressor OFF: battery voltage

With ignition switch ON (II): battery

voltage

With fully warmed up engine running: 0 V

With ignition switch ON: battery voltage

With fully warmed up engine running:

pulses

With ignition switch ON (II): 0 V

With engine running: pulses

Less than 1.0 V at all times

With ignition switch ON (II): battery voltage

With ignition switch OFF: 0 V

With engine running: pulses

With ignition switch ON (II): battery

voltage

With engine speed below 4,800 rpm:

battery voltage

With engine speed above 4,800 rpm: 0 V

With engine running, engine coolant

below 153°F (67°C): battery voltage

With engine running, engine coolant

above 153°F (67°C): 0 V

With ignition switch ON (II): battery

voltage

With fully warmed up engine running: 0 V

With ignition switch ON (II): battery

voltage

With fully warmed up engine running: 0 V

With ignition switch ON (II): 0 V

With engine running: pulses

Less than 1.0 V at all times

Less than 1.0 V at all timesProCarManuals.com

Terminal

number

1

2

3

4

4*

5

6

7

8

9

10

11

12

13

14

15

16
Wire

color

BLU

RED

BLU/BLK

RED

LTGRN

ORN

WHT

ORN/BLU

BLU/GRN

BRN/BLK

GRY

GRN

BLU

ORN/BLU

WHT/BLU

WHT/BLU

BLU/YEL
Terminal name

VTP SWF (FRONT VTEC

PRESSURE SWITCH)

IGN COIL6 (No. 6 IGNITION

COIL part of IGNITION

CONTROL MODULE)

VTP SWR (REAR VTEC

PRESSURE SWITCH)

ATP PN (A/T GEAR

POSITION SWITCH)

NT SW (NEUTRAL

SWITCH)

CYP 2P (CYP SENSOR 2 P

SIDE)

CYP 1P (CYP SENSOR 1 P

SIDE)

CKP 2P (CKP SENSOR 2 P

SIDE)

CKP 1P (CKP SENSOR 1 P

SIDE)

LG2 (LOGIC GROUND)

IGN COIL5 (No. 5 IGNITION

COIL part of IGNITION

CONTROL MODULE)

IGN COIL4 (No. 4 IGNITION

COIL part of IGNITION

CONTROL MODULE)

IGN COILS (No. 3 IGNITION

COIL part of IGNITION

CONTROL MODULE)

CYP 2M (CYP SENSOR 2 M

SIDE)

CYP 1M (CYP SENSOR 1 M

SIDE)

CKP 2M (CKP SENSOR 2 M

SIDE)

CKP 1M (CKP SENSOR 1 M

SIDE)
Description

Detects VTEC pressure switch

signal

Sends ignition pulse

Detects VTEC pressure switch

signal

Detects A/T gear position

switch signal

Detects neutral switch signal

Detects CYP sensor 2

Detects CYP sensor 1

Detects CKP sensor 2

Detects CKP sensor 1

Ground for the ECM control

circuit

Sends ignition pulse

Sends ignition pulse

Sends ignition pulse

Ground for CYP sensor 2

Ground for CYP sensor 1

Ground for CKP sensor 2

Ground for CKP sensor 1
Signal

With engine at low rpm: 0 V

With engine at high rpm:

battery voltage

With ignition switch ON (II): 0 V

With engine running: pulses

With engine at low rpm: 0 V

With engine at high rpm:

battery voltage

In or position: 0V

In any other position: approx. 5 V

In neutral position: 0 V

In any other position: approx. 5 V

With engine running: pulses

With engine running: pulses

With engine running: pulses

With engine running: pulses

Less than 1.0 V at all times

With ignition switch ON (II): 0 V

With engine running: pulses

With ignition switch ON (II): 0 V

With engine running: pulses

With ignition switch ON (II): 0 V

With engine running: pulses

(cont'd)
Wire side of female terminals

NOTE: Standard battery voltage is 12 V.

*: M/T
ECM CONNECTOR B (16P)ProCarManuals.com

Description

The automatic transmission is a combination of a 3-element torque converter and a triple-shaft electronically controlled

automatic transmission which provides 4 speeds forward and 1 speed reverse. The entire unit is positioned in line with the

engine.

Torque Converter, Gears, and Clutches

The torque converter consists of a pump, turbine, and stator, assembled in a single unit.

They are connected to the engine crankshaft so they turn together as a unit as the engine turns.

Around the outside of the torque converter is a ring gear which meshes with the starter pinion when the engine is being

started. The entire torque converter assembly serves as a flywheel while transmitting power to the transmission main-

shaft. The transmission has three parallel shafts: the mainshaft, the countershaft, and the secondary shaft. The mainshaft

is in line with the engine crankshaft.

The mainshaft includes the 1st and 4th clutches, and gears for 3rd, 4th, reverse, and 1st (3rd gear is integral with the main-

shaft, while reverse gear is integral with 4th gear).

The countershaft includes the 1st-hold and 3rd clutches, and gears for 2nd, 3rd, 4th, reverse, 1st, and parking.

The secondary shaft includes the 2nd clutch and gears for 2nd and 3rd.

The 4th and reverse gears can be locked to the countershaft at its center, providing 4th gear or reverse, depending on

which way the selector is moved.

The gears on the mainshaft and secondary shaft are in constant mesh with those on the countershaft.

When certain combinations of gears in the transmission are engaged by clutches, power is transmitted from the mainshaft

to the countershaft to provide positions.

Electronic Control

The electronic control system consists of the Transmission Control Module (TCM), sensors, a linear solenoid, a shift switch,

and 4 solenoid valves. Shifting and lock-up are electronically controlled for comfortable driving under all conditions.

The TCM is located on the insulator center bulkhead, behind the driver's seat.

Hydraulic Control

The valve bodies include the main valve body, secondary valve body, servo body, regulator valve body, throttle valve

body, lock-up valve body, and the 2nd accumulator body.

They are bolted to the torque converter housing as an assembly.

The main valve body contains the manual valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, relief valve, one-way relief

valve, and oil pump gears.

The secondary valve body contains the 3-2 kick-down valve, clutch pressure control (CPC) valve, 2nd orifice control valve, 3rd

orifice control valve, modulator valve, 4th exhaust valve, servo control valve, 2nd exhaust valve, and 4-3 kick-down valve.

The servo body contains the accumulator pistons and servo valve. The throttle valve body includes the throttle valve B

which is bolted to the servo body.

The regulator valve body contains the pressure regulator valve, lock-up control valve, and cooler relief valve. Fluid from

the regulator passes through the manual valve to the various control valves.

The lock-up valve body contains the lock-up timing B valve and lock-up shift valve. The 2nd accumulator body contains

the accumulator pistons and limited slip differential relief valve.

The torque converter check valve is located in the torque converter housing, under the main valve body.

The 1st, 1st-hold, 3rd, and 4th clutches receive fluid from their respective feed pipes and the 2nd clutch receives fluid from

the internal hydraulic circuit.

Shift Control Mechanism

Input from various sensors located throughout the vehicle determines which shift control solenoid valve the TCM will acti-

vate. Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This pressurizes

a line to one of the clutches, engaging that clutch and its corresponding gear.

Lock-up Mechanism

In position and position in 2nd, 3rd, and 4th, pressurized fluid is drained from the back of the torque converter

through a fluid passage, causing the lock-up piston to be held against the torque converter cover. As this takes place, the

mainshaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the TCM optimizes the tim-

ing of the lock-up mechanism.

The lock-up valves control the range of lock-up according to lock-up control solenoid valves A and B, and throttle valve B.

When lock-up control solenoid valves A and B activate, modulator pressure changes. The lock-up control solenoid valves

A and B are mounted on the torque converter housing, and are controlled by the TCM.

(cont'd)ProCarManuals.com

(cont'd)
Pressure Testing

• Clutch Low/High Pressure Measurement

While testing, be careful of the rotating

rear wheels.

1. Allow the rear wheels to rotate freely.

2. Start the engine and let it idle.

3. Shift to position.

4. Slowly press down the accelerator pedal to increase

engine rpm until pressure is indicated on the oil

pressure gauge. Then release the accelerator pedal,

allowing the engine return to an idle, and measure

the pressure reading.
5. With the engine idling, press down the accelerator

pedal approximately 1/2 of its possible travel and

increase the engine rpm until pressure is indicated

on the gauge. Note the highest pressure reading

obtained.

6. Repeat steps 4 and 5 for each clutch pressure being

inspected.ProCarManuals.com

20. Remove the intermediate shaft heat shield cover and the intermediate shaft mounting bolts.

21. Pry the intermediate shaft out of the differential. Pull and remove it.

NOTE:

• Coat all precision finished surfaces with clean engine oil.

• Tie a plastic bag over the intermediate shaft end.
Removal (cont'd)
Transmission

22. Remove the parking brake cable holder and the wheel sensor wire clamp.

23. Make a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.

24. Separate the toe control arm from the side beam.

25. Remove the damper fork bolt.

26. Separate the lower control arm from the side beam.

27. Pry the left driveshaft out of the differential. Pull and remove it.

NOTE:

• Coat all precision finished surfaces with clean engine oil.

• Tie a plastic bag over the driveshaft end.ProCarManuals.com

Starter Solenoid Test

1. Check the hold-in coil for continuity between the S

terminal and the armature housing (ground).

The coil is OK if there is continuity.

ARMATURE HOUSING

(GROUND)

2. Check the pull-in coil for continuity between the S

and M terminals.

The coil is OK if there is continuity.
Starter Replacement

1. Disconnect the battery negative cable.

2. Remove the engine wire harness from the harness

clip on the starter motor.

3. Disconnect the starter cable and the BLK/WHT

wire.

4. Remove the two bolts holding the starter, and

remove the starter.

UPPER MOUNTING BOLT

75 N-m (7.6 kgf-m, 55 Ibf-ft)

B TERMINAL MOUNTING NUT

9 N-m (0.9 kgf-m, 6.5 Ibf-ft)

STARTER CABLE

LOWER MOUNTING BOLT

75 N-m (7.6 kgf-m, 55 Ibf-ft)
BLK/WHT WIREProCarManuals.com