P0080 B1 Exhaust Valve Control Solenoid Circuit High
Content
P0080 B1 Exhaust Valve Control Solenoid Circuit High
OBD-II DTC Datasheet
High signal level in the solenoid valve circuit of the exhaust valve control (Bank 1)
What does this mean?
This code is a generic OBD-II powertrain code, which means it applies to all makes and models of vehicles (1996 and newer), although specific repair steps may differ depending on the model.
On vehicles equipped with a variable valve timing (VVT) system, the engine control module / powertrain control module (ECM / PCM) monitors the camshaft position by adjusting the engine oil level with the camshaft position control solenoid. The control solenoid is controlled by a pulse width modulated (PWM) signal from the ECM / PCM. The ECM / PCM monitors this signal and if the voltage is above specification, it sets this DTC and turns on the MIL.
Bank 1 refers to the #1 cylinder side of the engine - be sure to check according to the manufacturer's specifications. The exhaust valve control solenoid is usually located on the exhaust manifold side of the cylinder head. This code is similar to codes P0078 and P0079. This code may also be accompanied by P0027.
symptoms
P0080 symptoms may include:
- Check Engine Light (Malfunction Indicator Lamp) is on
- The car can suffer from poor acceleration and reduced fuel consumption.
Possible reasons
Possible reasons may include:
- Bad connection or disconnection of the wiring harness
- Open circuit of the control solenoid
- Short circuit to power
- Defective ECM
Diagnostic steps
Wiring Harness - Check for loose wiring harness connections, look for corrosion or loose wires to connectors. Disconnect the harness connectors from the solenoid and PCM using the wiring diagram, locate the + and - wires to the solenoid. The solenoid can be driven from the ground side or from the power side, depending on the application. Refer to the factory wiring diagrams to determine the power flow in the circuit. Using a digital volt/ohmmeter (DVOM) set to the Ohm setting, check the resistance between each end of the wire. Exceeding the limit on the DVOM could be an open in the wiring, a loose connection, or a terminal.
Control Solenoid - With the harness to the solenoid disconnected, using the DVOM set to ohms, check the resistance between each of the electrical terminals on the control solenoid itself. Use factory specifications or a known-good control solenoid, if available, to determine if there is resistance in the solenoid. If the DVOM has an over limit or very low resistance, the solenoid is probably bad.
Short to power - Disconnect the harness from the PCM/ECM and locate the wires to the control solenoid. With the DVOM set to volts, connect the negative lead to ground and the positive lead to the wire(s) to the control solenoid. Check for voltage, if present, there may be a short to power in the wiring harness. Locate a short to power by unplugging the harness connectors and checking the wiring back to the solenoid.
PCM/ECM - If all wiring and control solenoid are OK, it will be necessary to monitor the solenoid while the engine is running by checking the wires to the PCM/ECM. Using an advanced scan tool that reads engine functions, monitor the duty cycle set by the control solenoid. It will be necessary to control the solenoid while the engine is running at various engine speeds and loads. Using an oscilloscope or graphical multimeter set to duty cycle, connect the negative wire to a known good ground and the positive wire to any wire terminal on the solenoid itself. The multimeter reading should match the specified duty cycle on the scan tool. If they are opposite, the polarity may be reversed - connect the positive wire on the other end of the wire to the solenoid and repeat the test to check. If the signal detected from the PCM is constantly on, the PCM itself may be faulty.
Related DTC discussions
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