Acura RL (1996-2004 year). Manual — part 269
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.
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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)
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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 P0175
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Random Misfire
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0300, and
some of P1201 - P1206 or some of P1301 - P1306: Random misfire.
Description
Misfire detection is accomplished by monitoring the voltage of the spark plug with the spark plug voltage sensor which is
built in to the ignition coil.
If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and DTC
P0300, some of DTCs P1201 through P1206 or some of DTCs P1301 through P1306 will be stored. Then, after 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 DTC
P0300, some of DTCs P1201 through P1206 or some of DTCs P1301 through P1306 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 metering
P0401, P0404, P0406: EGR system
P0345, P0349, P0390, P0394, P1336, P1337, P1386, P1387: CKP/CMP (CKP/CYP) sensor
P0506, P0507: Idle Control System
P0511: IAC valve
Possible Cause
Fuel pump insufficient fuel pressure, amount of flow
Fuel line clogging, blockage, leakage
Fuel filter clogging
Fuel pressure regulator stuck open
EGR system malfunction
Ignition coil wire open, leakage
Ignition control module malfunction
IAC valve malfunction
Fast idle thermo valve malfunction
Carbon deposits on valves
Compression low
Gasoline does not meet Owner's Manual spec., lack of fuel
Troubleshooting
By test-driving, determine the conditions during which misfire occurs. Depending on these conditions, test in the order
described in the table below.
NOTE: If misfire doesn't recur, some possible causes are fuel that doesn't meet owner's manual spec, lack of fuel, carbon
deposits on spark plug, etc.
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