1996 ACURA RL KA9 sensor

PGM-FI System

Primary Heated Oxygen Sensor (HO2S) (Sensor 1) (cont'd)

Troubleshooting Flowchart

Is DTC P0133 and/or P0153

indicated?
NO

YES
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose terminals at

C251, C254 (located at right shock

tower), C119 (right primary H02S

(Bank 1, Sensor 1)) or C126 (left

primary H02S (Bank 2, Sensor

1))*
and
PCM.
— The MIL has been reported on.

— DTC P0133 and/or P0153

stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the radiator fan comes on.

3. Connect the SCS service con-

nector.

4. Test-drive under following

conditions.

— 55 mph (88 km/h) steady

speed

— Transmission in posi-

tion

— Until readiness code comes

on

Replace the primary HO2S (Sen-

sor 1).ProCarManuals.com

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0134: Right Primary Heated Oxygen Sensor

(Right Primary HO2S) (Bank 1, Sensor 1) heater system malfunction.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0154: Left Primary Heated Oxygen Sensor

(Left Primary H02S) (Bank 2, Sensor 1) heater system malfunction.

The MIL has been reported on.

DTC P0134 and/or P0154 are

stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the
radiator
fan
comes
on.

Is DTC P0134 and/or P0154

indicated?

YES

Check for an open in the HO2S:

1. Turn the ignition switch OFF.

2.
Disconnect
the
right primary

H02S (Bank 1, Sensor 1) or left

primary HO2S* (Bank2, Sen-

sor 1) connector.

3. Install a jumper wire on the

harness side of the right prima-

ry H02S (Bank 1,Sensor 1) or

left primary H02S*connector

between terminals No. 1 and

No. 2.

4. Turn the ignition switch ON (II).

5. Check the right primary HO2S

(Bank 1, Sensor 1) or left pri-

mary HO2S*(Bank2, Sensorl)

output voltage with the HDS

or the scan tool.

Is there 1.5 V or more?

YES

Check for an open in the wires

(PHO2S line):

1. Turn the ignition switch OFF.

2. Install a jumper wire on the

PCM connector between D19,

orD18*andD22.

3. Turn the ignition switch ON (II).

4. Check the right primary H02S

(Bank 1, Sensor 1) or left pri-

mary H02S* (Bank 2, Sensor 1)

output voltage with the HDS

or the scan tool.

Is there 1.5 V or more?

YES
NO
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose terminals at

C251, C254 (located at right shock

tower), C119 (right primary H02S

(Bank 1, Sensor 1)) or C126 (left

primary H02S (Bank 2, Sensor 1))*

and
PCM.

Replace the HO2S.

Repair open in the wire between

PCM (019 or D18*) and right pri-

mary HO2S (Bank 1, Sensor 1) or

left primary HO2S* (Bank 2,

Sensor 1).

Substitute a known-good PCM and

recheck. If symptom/indication

goes away, replace the original

PCM.ProCarManuals.com

PGM-FI System

Primary Heated Oxygen Sensor (HO2S) (Sensor 1) (cont'd)

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2297: A high voltage problem in the Right

Primary Heated Oxygen Sensor (Right Primary HO2S) (Bank 1, Sensor 1) circuit.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2298: A high voltage problem in the Left

Primary Heated Oxygen Sensor (Left Primary HO2S) (Bank 2, Sensor 1) circuit.

— The MIL has been reported on.

— DTC P2297 and/or P2298 are

stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Test-drive with the transmis-

sion in [2] position.

3. Check the right primary H02S

(Bank 1, Sensor 1) or left primary

HO2S*(Bank2, Sensor 1) out-

put voltage with the scan tool

during deceleration using com-

pletely closed throttle.

Is DTC P2297 and/or P2298

indicated?
NO
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose terminals at

C251, C254 (located at right shock

tower), C119 (right primary H02S

(Bank 1, Sensor 1)) or C126 (left

primary HO2S (Bank 2, Sensor 1))*

and
PCM.

*: P2298
Replace the HO2S.ProCarManuals.com

Fuel Supply System

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0171: The fuel system is too lean [Right

Bank (Bank 1)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0172: The fuel system is too rich [Right

Bank (Bank 1)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0174: The fuel system is too lean [Left Bank

(Bank 2)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0175: The fuel system is too rich [Left Bank

(Bank 2)].

Description

By monitoring the Long Term Fuel Trim, long term malfunctions in the fuel system will be detected.

If a
malfunction
has
been detected
during
two
consecutive
trips,
the MIL
will
come
on and DTC
P0171,
P0172, P0174

and/or P0175 will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174 and/or P0175, trou-

bleshoot those DTCs first, then troubleshoot DTC P0171, P0172, P0174 and/or P0175.

P0107, P0108, P1128, P1129: MAP Sensor

P0135: Right Primary HO2S Heater (Bank 1, Sensor 1)

P0137, P0138: Secondary HO2S (Sensor 2)

P0141: Secondary HO2S Heater (Sensor 2)

P0155: Left Primary H02S Heater (Bank 2, Sensor 1)

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

Possible Cause

Fuel Pump insufficient flow/pressure

Fuel Feed Line clogged, leaking

Fuel Pressure Regulator stuck open

Fuel Filter clogged

Injector clogged, air inclusion

Gasoline doesn't meet Owner's Manual spec.

Primary H02S (Sensor 1) deteriorated

EGR System insufficient flow

Exhaust leak

Fuel Pressure Regulator clogged, stuck closed

Fuel Return Pipe clogged

Injector leaking

Gasoline doesn't meet Owner's Manual spec.

Primary HO2S (Sensor 1) deteriorated

EGR System malfunction (too much flow)

EVAP Canister Purge Valve leaking, stuck opened

(cont'd)ProCarManuals.com

PGM-FI System

Fuel Supply System (cont'd)

Troubleshooting Flowchart

— The MIL has been reported on.

— DTC P0171, P0172, P0174 and/

or P0175 are stored.

Check the fuel pressure.

Is the fuel pressure OK?
NO

YES

Check the Primary HO2S:

1. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the radiator fan comes on.

2. Check the right primary or left

primary* H02S (Sensor 1) out-

put voltage with the HDS or

the scan tool.
Is the fuel pressure too high

or too low?
Check the fuel pressure regulator

and fuel return pipe.

LOW

Check the fuel pump, fuel feed

pipe, fuel filter, and fuel pressure

regulator.

Does it stay at less than 0.3 V

or more than 0.6V?
Replace the HO2S.

NO

Check for a sticking or leaking

EVAP canister purge valve:

With a vacuum pump, apply vacu-

um to the EVAP canister purge

valve from the intake manifold

side.

Does it hold vacuum?
Replace the EVAP canister purge

valve.

YES

Check the EGR system. If it is OK,

replace the fuel injectors.

*: P0174 or P0175ProCarManuals.com

PGM-FI System

Description

Misfire detection is accomplished by monitoring the voltage of the spark plug with the spark plug voltage sensor which is

built into the ignition coil.

If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and a

misfire DTC will be stored. Then, after the misfire has ceased, the MIL will come on and stay on whenever the ignition

switch is ON (II).

If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and a misfire

DTC will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then

troubleshoot the misfire DTC.

P1128, P1129: MAP sensor

P0171, P0172, P0174, P0175: Fuel supply system

P0401, P0404, P0406: EGR system

P1316, P1317, P1318, P1319: Spark Plug Voltage Detection System

P0345, P0349, P1336, P1337: CKP sensor

P0390, P0394, P1386, P1387: CMP (CYP) sensor

Possible Cause

Injector clogging, fuel leakage, air leakage

Injector circuit open or shorted

Injector resistor malfunction

Spark plug carbon deposits, fouling, malfunction

Ignition coil malfunction

ICM malfunction

Compression low

11-60
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1201 or P1301: Cylinder 1 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1202 or P1302: Cylinder 2 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1203 or P1303: Cylinder 3 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1204 or P1304: Cylinder 4 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1205 or P1305: Cylinder 5 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1206 or P1306: Cylinder 6 mis-

fire detected.
Misfire Detected in One CylinderProCarManuals.com

PGM-FI Syste m
Crankshaf t Position/Camshaf t Positio n (CKP/CMP ) (Crankshaf t
Position/Cylinde r Positio n (CKP/CYP) ) Senso r
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0345 : A malfunctio n i n th e circui t o f th e
Crankshaf t Positio n (CKP ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0349 : A n intermitten t interruptio n proble m of
th e Crankshaf t Positio n (CKP ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0390 : A malfunctio n in th e circui t o f th e Camshaf t
Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0394 : A n intermitten t interruptio n proble m
o f th e Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1336 : A n intermitten t interruptio n proble m o f
th e Crankshaf t Positio n (CKP ) senso r 2 .
I Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1337 : A malfunctio n i n th e circui t o f th e
' Crankshaf t Positio n (CKP ) senso r 2 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1386 : A n intermitten t interruptio n proble m
o f th e Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 2 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1387 : A malfunctio n i n th e circui t o f th e
Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 2 .
Th e CK P Senso r determine s timin g fo r injectio n an d ignitio n o f eac h cylinde r an d als o detect s engin e speed .
Th e CM P (CYP ) Senso r detect s th e positio n o f No . 1 cylinde r fo r sequentia l injectio n t o eac h cylinder . Th e CKP/CM P
(CKP/CYP ) Senso r i s installe d behin d th e fron t camshaf t pulley .
— Th e MI L ha s bee n reporte d on .— DT C P0345 , P0349 , P0390 ,P0394, P1336 , P1337 , P138 6
and/o r P138 7 ar e stored .
Proble m verification :
1. D o th e PC M Rese t Procedure .2. Star t th e engine .
Check fo r a n ope n i n th e CKP /CMP (CKP/CYP ) sensor :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e CKP/CM P(CKP/CYP) 8 P connector .3. Measur e resistanc e betwee nthe terminal s o f th e indicate dsensor (se e table) .
Is ther e 65 0 - 85 0 fl ?
YE S
Chec k fo r a shor t i n th e CKP /CMP (CKP/CYP ) sensor :Check fo r continuit y t o bod ygroun d o n bot h terminal s o f th eindicate d sensor .
CKP PICK-U PCOIL 2
CM P (CYP ) PICK-U PCOIL 1
N O
Intermitten t failure , syste m is O Kat thi s time . Chec k fo r poo r con -nection s o r loos e terminal s a tC251 , C25 5 (locate d a t righ t shoc ktower) , C13 0 (CKP/CM P (CKP /CYP)) senso r an d PCM .
Replac e th e CKP/CM P (CKP/CYP )sensor (se e sectio n 6) .
CK P PICK-U PCOIL1
CMP (CYP ) PICK-U PCOIL 2
CKP/CM P (CKP/CYP ) SENSO R 8 P CONNECTO R
(To pag e 11-65 )Termina l sid e o f mal e terminal s
Is DT C P0345 , P0349 , P0390 , P0394 ,P1336, P1337 , P138 6 and/o r P138 7indicated ?
ProCarManuals.com

Thermostat

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1486: Range/Performance Problem in

Thermostat.

NOTE: If the DTCs listed below are stored at the same time as DTC P1486, troubleshoot those DTCs first, then recheck for

P1486.

P0107, P0108, P1128, P1129: MAP Sensor

P2227, P2228, P2229: Barometric Pressure Circuit

P1259, P1279: VTEC system

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

P0125, P0116, P0117, P0118: Engine Coolant Temperature Circuit

P0112, P0113: Intake Air Temperature Circuit

P0345, P0349, P1336, P1337: CKP Sensor 1/2

P0300: Random Misfire

P0301, P0302, P0303, P0304, P0305, P0306: Cylinder 1, 2, 3, 4, 5 or 6 Misfire detected.

P0506, P0507: Idle Control System Malfunction

P0511: Idle Air Control Valve

DTC P1486 can set occasionally when the hood is opened.

Troubleshooting

— The MIL has been reported on.

— DTC P1486 is stored.

1. Turn the ignition Switch OFF.

2. Check the engine coolant

level.

Is the engine coolant level low?

Does the radiator fan keep

running?

YES

Check the radiator fan circuit,

radiator fan switch circuit and

the radiator fan switch.

It they are OK, substitute the

PCM and recheck.

If the symptom/indication goes

away, replace the original PCM.
Refill the engine coolant. If neces-

sary, check the cooling system.

Test the thermostat.
Check for the radiator for circuit:

1. Turn the ignition switch ON

(II).

2. Check the radiator fan.ProCarManuals.com