Acura RL (1996-2004 year). Manual — part 267
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Troubleshooting
Diagnostic Trouble Code (DTC) Chart (cont'd)
DTC
(MIL indication)
P2297 (2)
P2298 (1)
Detection Item
Right Primary Heated Oxygen
Sensor (Right Primary H02S)
Circuit High Voltage
(Bank 1, Sensor. 1)
Left Primary Heated Oxygen
Sensor (Left Primary H02S)
Circuit High Voltage
(Bank 2, Sensor 1)
Probable Cause
• Right Primary H02S (Bank 2, Sensor 1)
• Short in Right Primary H02S (Bank 2,
Sensor 1) circuit
• Fuel supply system
• PCM
• Left Primary HO2S (Bank 2, Sensor 1)
• Short in Left Primary H02S (Bank 2,
Sensor 1) circuit
• Fuel supply system
• PCM
Page
Main Menu
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Engine Coolant Temperature (ECT) Sensor
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0116: A range/performance problem in the
Engine Coolant Temperature (ECT) sensor.
The ECT Sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the engine
coolant temperature increases as shown below.
NOTE: If DTC P0117 and/or P0118 are stored at the same time as DTC P0116 and/or P0125, troubleshoot those DTCs first,
then troubleshoot DTC P0116 and/or P0125.
Possible Cause
• ECT sensor deterioration
• Malfunction in the thermostat and the cooling system
Troubleshooting Flowchart
— The MIL has been reported on.
— DTC P0116 is stored.
Problem verification:
1. Turn the ignition switch OFF.
2. Check the ETC output tempera-
ture or voltage with the HDS or
the scan tool.
Is about 176°F (80°C) or high-
er, or 0.86 V or less indicated?
YES
Problem verification:
1. Note current coolant
temperature.
2. Turn the ignition switch OFF.
3. Cool the engine for 1 hour.
4. Check the ETC output temper-
ature or voltage with the HDS
or the scan tool.
Does the ECT change 3.6°F
(2°C) or more?
NO
Replace the ECT sensor.
NO
YES
Problem verification:
1. Note current coolant
temperature.
2. Start the engine. Hold the
engine speed at 3,000 rpm
with no load (in Park or neu-
tral) until the radiator fan
comes on, then let it idle.
3. Check the ETC output temper-
ature or voltage with the HDS
or the scan tool.
Does the ECT change 3.6°F
(2°C) or more?
NO
YES
Intermittent failure, system is OK
at this time. Check the thermo-
stat and the cooling system.
Intermittent failure, system is OK
at this time. Check the thermo-
stat and the cooling system.
(cont'd)
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PGM-FI System
Engine Coolant Temperature (ECT) Sensor (cont'd)
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0125: Engine Coolant Temperature
(ECT) sensor malfunction/slow response.
Is about 86°F (30°C) or less, or
2.61 V or higher indicated?
Intermittent failure, system is OK
at this time.
Check the thermostat and the
cooling system.
YES
Problem verification:
1. Let it idle for 6 minutes.
2. Check the ETC output temper-
ature or voltage with the HDS
or the scan tool.
Is about 86°F (30°C) or less, or
2.61 V or higher indicated?
Intermittent failure, system is OK
at this time.
Check the thermostat and the
cooling system.
YES
Replace the ECT sensor.
11-50
Problem verification:
1. Start the engine, and let it idle.
2. Check the ETC output temper-
ature or voltage with the HDS
or the scan tool.
— The MIL has been reported on
— DTC P0125 is stored.
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The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0133: A slow response problem in the Right
Primary Heated Oxygen Sensor (Right Primary H02S) (Bank 1, Sensor 1) circuit.
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0153: A slow response problem in the Left
Primary Heated Oxygen Sensor (Left Primary HO2S) (Bank 2, Sensor 1) circuit.
Description
By controlling the air/fuel ratio with a Primary HO2S (Sensor 1) and a Secondary HO2S (Sensor 2), the deterioration of the
Primary H02S (Sensor 1) can be evaluated by its feedback period. When the feedback period of the H02S exceeds a certain
value during stable driving conditions, the sensor will be judged as deteriorated. When deterioration has been detected dur-
ing two consecutive trips, the MIL comes on and DTC P0133 or P0153 will be stored.
NOTE: If DTC P2195, P0134, P2297 and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first,
then troubleshoot DTC P0133. If DTC P2197, P0154, P2298 and/or P0155 are stored at the same time as DTC P0153, trou-
bleshoot those DTCs first, then troubleshoot DTC P0153.
Possible Cause
• Primary HO2S (Sensor 1) Deterioration
• Primary H02S Heater (Sensor 1) Deterioration
• Exhaust system leakage
Primary Heated Oxygen Sensor (HO2S) (Sensor 1)
The Heated Oxygen Sensors (HO2S) detect the oxygen content in the exhaust gas and signal the PCM. In operation, the
PCM receives the signals from the sensor and varies the duration during which fuel is injected. To stabilize the sensor's
output, the sensor has an internal heater. The Right Primary HO2S (Bank 1, Sensor 1) is installed in the right exhaust man-
ifold, and the Left Primary HO2S (Bank 2, Sensor 1) is installed in the left exhaust manifold.
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