Possible causes – Faulty Intake Air Temperature Sensor– Intake Air Temperature Sensor harness is open or shorted– Intake Air Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1112 HONDA Description The

Possible causes – Faulty Intake Manifold Runner Control (IMRC) Valve– IMRC Valve harness is open or shorted– IMRC Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Intake Manifold Runner Control (IMRC) Valve– IMRC Valve harness is open or shorted– IMRC Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) HONDA Technical Service Bulletins for P1077

Possible causes – Faulty Manifold Absolute Pressure Sensor– Manifold Absolute Pressure Sensor harness is open or shorted– Manifold Absolute Pressure Sensor circuit poor electrical connection Tech notes There is a factory service bulletin for the following Honda models: 2001 Honda

Possible causes – Faulty Mass Airflow Sensor (MAF)– Mass Airflow Sensor harness is open or shorted– Mass Airflow Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Pressure Control Solenoid Valve ‘B’– Pressure Control Solenoid Valve ‘B’ harness is open or shorted– Pressure Control Solenoid Valve ‘B’ circuit poor electrical connection– Hydraulic system failure Symptoms – Engine Light ON (or Service Engine Soon

Possible causes – Faulty Rear Secondary HO2S Bank 1 Sensor 2– Rear Secondary HO2S Bank 1 Sensor 2 harness is open or shorted– Rear Secondary HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or

Possible causes – Faulty Throttle Actuator Control Actuator– Throttle Actuator Control Actuator harness is open or shorted– Throttle Actuator Control Actuator circuit poor electrical connection When is the code detected? Engine Control Module (ECM) detects short in both circuits between

Possible causes – Faulty Throttle Actuator– Throttle Actuator harness is open or shorted= Throttle Actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2135 HONDA Description Throttle actuator malfunction HONDA Technical Service Bulletins

Possible causes – Faulty Throttle Position Sensor– Throttle Position Sensor harness is open or shorted– Throttle Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Throttle Position Sensor– Throttle Position Sensor harness is open or shorted– Throttle Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Top Dead Center Sensor 1– Top Dead Center Sensor 1 harness is open or shorted– Top Dead Center Sensor 1 circuit poor electrical connection Tech notes Some Honda models Top Dead Center (TDC) sensor location: Symptoms

Possible causes – Faulty Vehicle Speed Sensor– Vehicle Speed Sensor harness is open or shorted– Vehicle Speed Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1791 HONDA Description The Vehicle Speed Sensor

Possible causes – Front Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted– Front Air/Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection– Faulty Front Air/Fuel Ratio Sensor Bank 1 Sensor 1 Symptoms – Engine

Possible causes – Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 harness is open or shorted– Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 circuit poor electrical connection– Faulty Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 Symptoms – Engine

Possible causes – Idle Air Control Valve harness is open or shorted– Idle Air Control Valve circuit poor electrical connection– Faulty Idle Air Control Valve Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine rough idle P1508

Possible causes – Low coolant level– Faulty Engine Coolant Temperature Sensor– Stuck or leaking thermostat– Engine Coolant Temperature Sensor harness is open or shorted– Engine Coolant Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine

Possible causes – Low coolant level– Faulty Engine Coolant Temperature Sensor– Stuck or leaking thermostat– Engine Coolant Temperature Sensor harness is open or shorted– Engine Coolant Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine

Possible causes – Low engine oil level – Faulty Rocker Arm Oil Control Solenoid – Faulty EOP (Engine Oil Pressure) sensor – Incorrect oil type used – Engine mechanical condition Tech notes The most common problem that can set the

Possible causes – Low engine oil pressure or level– Open or short circuit condition– Faulty VTEC oil pressure switch– Faulty VTEC solenoid When is the code detected? The P1259 is set when there is a problem in the VTEC Oil