1996 ACURA RL KA9 Service Repair Manual

(From pag e 11-54 )
Check fo r a shor t i n th e wires :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PC M connec -tor D (22P) .3. Chec k fo r continuit y betwee n
No . 1 termina l o n th e harnes s
sid e o f th e H02 S connecto r
an d bod y ground .
I s ther e continuity ?
NO
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
Repai r shor t i n th e wir e betwee n
PC M (D1 9 o r D18* ) an d righ t pri -
mar y HO2 S (Ban k 1 , Senso r 1 ) o rlef t primar y HO2S * (Ban k 2 ,Senso r 1) .
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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