Acura RL (1996-2004 year). Manual — part 268

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).

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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.

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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) P2195: A low voltage problem in the Right

Primary Heated Oxygen Sensor (H02S) (Bank 1, Sensor 1) circuit.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2197: A low voltage problem in the Left

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

— The MIL has been reported on.

— DTC P2195 and/or P2197 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.

3. Test-drive with the transmis-

sion in [2] position.

4. Check the right primary HO2S

(Bank 1, Sensor 1) or left pri-

mary HO2S* (Bank 2, Sensor
1) output voltage with the scan

tool during acceleration using
wide open throttle.

Is DTC P2195 and/or P2197
indicated?

Does it stay at 0.5 V or less?

YES

(To page

11-55

)

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.

NO

Repair fuel supply system.

Replace the HO2S.

*:P0151

Check for a short in the HO2S:

1. Turn the ignition switch OFF.

2. Disconnect the right primary

H02S (Bank 1, Sensor 1) or
left primary HO2S* (Bank 2,
Sensor 1) connector.

3. Start the engine and let it idle.
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 it normal?

Check the fuel pressure.

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(From page

11-54

)

Check for a short in the wires:

1. Turn the ignition switch OFF.
2. Disconnect the PCM connec-

tor D (22P).

3. Check for continuity between

No. 1 terminal on the harness

side of the H02S connector
and body ground.

Is there continuity?

NO

Substitute a known-good PCM
and recheck. If symptom/indica-

tion goes away, replace the origi-

nal PCM.

Repair short in the wire between
PCM (D19 or D18*) and right pri-
mary HO2S (Bank 1, Sensor 1) or
left primary HO2S* (Bank 2,
Sensor 1).

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