Possible causes – Faulty spark plug 4– Clogged or faulty fuel injector 4– Faulty ignition coil 4– Fuel injector 4 harness is open or shorted– Fuel injector 4 circuit poor electrical connection– Ignition coil 4 harness is open or shorted–

Possible causes – Faulty spark plug 5– Clogged or faulty fuel injector 5– Faulty ignition coil 5– Fuel injector 5 harness is open or shorted– Fuel injector 5 circuit poor electrical connection– Ignition coil 5 harness is open or shorted–

Possible causes – Faulty spark plug 6– Clogged or faulty fuel injector 6– Faulty ignition coil 6– Fuel injector 6 harness is open or shorted– Fuel injector 6 circuit poor electrical connection– Ignition coil 6 harness is open or shorted–

Possible causes – Faulty spark plug 7– Clogged or faulty fuel injector 7– Faulty ignition coil 7– Fuel injector 7 harness is open or shorted– Fuel injector 7 circuit poor electrical connection– Ignition coil 7 harness is open or shorted–

Possible causes – Faulty spark plug 8– Clogged or faulty fuel injector 8– Faulty ignition coil 8– Fuel injector 8 harness is open or shorted– Fuel injector 8 circuit poor electrical connection– Ignition coil 8 harness is open or shorted–

Possible causes – Faulty Speed Sensor– Speed Sensor harness is open or shorted– Speed Sensor circuit poor electrical connection When is the code detected? The output shaft speed sensor failed to provide a signal to the TCM upon initial movement

Possible causes – Faulty stop lamp switch– Blown stop lamp bulb– Brake switch harness open or shorted– Brake switch circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0504 LEXUS Description In addition to

Possible causes – Faulty throttle position sensor.– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection When is the code detected? An excessively low voltage from the Throttle Position Sensor (TPS) is sent to

Possible causes – Faulty Throttle Position Sensor– Throttle Position Sensor circuit is open or shorted– Throttle Position Sensor poor electrical connection When is the code detected? Malfunction is detected when an excessively low or high voltage from the sensor is

Possible causes – Faulty throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection When is the code detected? An excessively high voltage from the Throttle Position Sensor (TPS) is sent to

Possible causes – Faulty throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? Malfunction is detected when an excessively low or

Possible causes – Faulty Throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor poor electrical connection When is the code detected? An excessively high voltage from the Throttle Position Sensor (TPS) is sent to Engine

Possible causes – Faulty Throttle position sensor– Throttle position sensor harness is open or shorted– Throttle position sensor poor electrical connection When is the code detected? An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine

Possible causes – Faulty torque converter clutch solenoid valve– Torque converter clutch solenoid valve harness is open or shorted– Torque converter clutch solenoid valve circuit poor electrical connection– Low transmission fluid level– Dirty transmission fluid Tech notes This is an

Possible causes – Faulty Transfer Neutral Position Switch– Transfer Neutral Position Switch harness is open or shorted– Transfer Neutral Position Switch circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0818 LEXUS Description The

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects excessively high voltage from the

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects excessively low or high voltage

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects excessively low or high voltage

Possible causes – Faulty Transmission Fluid Temperature Sensor– Transmission Fluid Temperature Sensor harness is open or shorted– Transmission Fluid Temperature Sensor circuit poor electrical connection When is the code detected? Transmission Control Module (TCM) detects excessively low voltage from the

Possible causes – Faulty Transmission Speed Sensor– Transmission Speed Sensor harness is open or shorted– Transmission Speed Sensor circuit poor electrical connection When is the code detected? Diagnostic Trouble Code (DTC) P0715 is detected when TCM or ECM does not