CODE NO. P1576: Torque Control Fail (Air Flow Sensor)
CODE NO. P1577: Torque Control Fail (Manifold Absolute Pressure Sensor)
CODE NO. P1578: Torque Control Fail (Barometric Pressure Sensor)
CODE NO. P1579: Torque Control Fail (Engine Coolant Temperature Sensor)
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be stored when the engine-ECU determines that is defective according to the following conditions.
Code No. P1576
- The air flow sensor output voltage is abnormal for two seconds.
- The difference between the volumetric efficiency (actual value) which is based on the air flow sensor value and that which is based on the throttle position sensor exceeds a predetermined value.
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This diagnosis code may be stored before the engine-ECU determines that the air flow sensor system is defective.
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Code No. P1577
- The manifold absolute pressure sensor output voltage is abnormal for two seconds.
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This diagnosis code may be stored before the engine-ECU determines that the manifold absolute pressure sensor system is defective.
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Code No. P1578
- The barometric pressure sensor output voltage is abnormal for 12 seconds.
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This diagnosis code may be stored before the engine-ECU determines that the barometric pressure sensor system is defective.
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Code No. P1579
- The engine coolant temperature sensor output voltage is abnormal for two seconds.
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This diagnosis code may be stored before the engine-ECU determines that the engine coolant temperature sensor system is defective.
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PROBABLE CAUSES
- Failed air flow sensor <Code No. P1576>
- Failed manifold absolute pressure sensor <Code No. P1577>
- Failed barometric pressure sensor <Code No. P1578>
- Failed engine coolant temperature sensor <Code No. P1579>
- Open/short circuit or harness damage in air flow sensor circuit or loose connector contact.
- Malfunction of the engine-ECU.
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STEP 1. Check the MPI system diagnosis code.
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Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13A - Troubleshooting, Diagnosis Function <4B1>, GROUP 13B - Troubleshooting, Diagnosis Function <6B3>).
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Q.
Is any diagnosis code stored?
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Repair the MPI system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code <4B1>, GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Code <6B3>). Then go to Step 3.
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Go to Step 2.
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STEP 2. Read the diagnosis code.
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(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
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(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control indicator lamp <standard meter> or the cruise control display screen <high contrast meter> is turned on).
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(3)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to ).
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Q.
Is diagnosis code No. P1576, P1577, P1578 or P1579 stored?
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Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU <4B1>, GROUP 13B - Engine-ECU <6B3>). Then go to Step 3.
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
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STEP 3. Read the diagnosis code.
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(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
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(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control indicator lamp <standard meter> or the cruise control display screen <high contrast meter> is turned on).
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(3)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to ).
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Q.
Is diagnosis code No. P1576, P1577, P1578 or P1579 stored?
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Return to Step 1.
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This procedure is complete.
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