Air intake device The electronic fuel injection system consists of three components: air intake, electronic control, fuel supply. This device provides air to all engine components. It consists of an air filter, an air intake pipe, a...
Electronic control system Control system To ensure the supply of fuel to the engine cylinders at the right time and in the right amount, the control system for this process must be able to perform a number of separate functions. The brain of...
Fuel system Fuel pump Fuel enters the pump through the fuel filter, flows around the armature through a one-way valve, and enters the engine compartment. A silencer is used to dampen pulsations in the fuel flow. The pump has a...
Diagnostics and health check Self-diagnosis indicators The Quick Index or Diagnostic Card covers the most common electronic fuel control system failures. The causes of malfunctions are listed in order of difficulty to check and correct them. Review...
Additional information about the ECU device After repair work, disconnect the negative battery cable for at least 10 seconds, or remove the ECU power fuse. This is necessary to erase the ECU memory. Disconnecting the battery cable also erases the clock and radio...
Oxygen Sensor — Check Accord 1985-86 and Prelude 1986-89 1. Remove the oxygen sensor connector. 2. Start the engine and warm it up with no load at 3000 RPM, then increase the RPM to 4000 RPM and quickly release the throttle pedal. Repeat the...
Manifold air pressure sensor (MAP sensor) Accord 1985-86 1. Disconnect the vacuum hose between the MAP sensor and the throttle from the throttle and plug the hose hole in the throttle. Connect a hand pump to the open end of the vacuum hose. 2. Remove the sensor...
Atmospheric pressure sensor (PA-sensor) Accord 1985-88 1. Disconnect the connector from the control box. Connect cable test system (07999-PD6000A or equivalent) between the control unit and the cable connector. 2. Turn on the ignition. Connect the positive...
Idle air mixture control sensor (IMA sensor) Accord 1985 1. Open the No.1 control box cover and remove the IMA sensor mounting rivets. 2. Disconnect the IMA sensor and the 3P connector. 3. Turn the knob to measure the resistance between the brown and green...
Intake air temperature sensor (TA-sensor) Accord 1986 and Prelude 1986-89 1. Disconnect the connector and remove the sensor from the intake manifold. 2. To test the sensor, place it in cold water while heating it slowly. Measure the resistance between the...
Coolant temperature sensor (TW-sensor) Accord 1986 and Prelude 1986-89 1. Disconnect the connector and remove the TW sensor from the thermostat housing. 2. To test the sensor, place it in cold water while heating it slowly. Measure the resistance between the...
Crank angle sensor (CYL sensor) Accord 1985-86 and Prelude 1986-89 If the test result of the CYL sensor or cylinder top dead center sensor is bad, replace them as a block. 1. Disconnect the connector from the crankshaft angle sensor. 2. Measure the...
Crank angle sensor (TDC sensor) If the test results of the CYL and TDC sensors are poor, replace them as a unit. 1. Disconnect the connector from the crankshaft angle sensor. 2. Measure the resistance between (orange/blue and white/blue for 1986...
Throttle Angle Sensor Do not adjust the throttle stop screw. It is installed at the factory. 1. Disconnect the throttle angle sensor connector. Accord 1985 2. Measure the resistance between the yellow and green sensor terminals. The...
Idle solenoid control valve Accord 1985-86 The idle control solenoid valve is actuated by the on-board computer. When the solenoid valve opens, it lets vacuum into the hose (#26 on 1985 models and top hose on 1986 models) and increases idle speed...
Idle control test Accord 1987-89 1. Check the vacuum line for erroneous connections, kinks, blockages or accidental disconnections. 2. Disconnect the lower vacuum hose from the idle air control solenoid valve to the air chamber, connect...
Idle Air Control Solenoid Check #1 Accord 1987-89 1. Start the engine at idle. 2. Disconnect the top hose from the idle air control solenoid valve from the intake manifold and check the vacuum. There must be a vacuum. 3. If there is no vacuum, check the...
Idle Air Control Solenoid Check #2 Accord 1987-89 1. Start the engine. 2. Disconnect the two-pin connector from the idle speed solenoid valve. 3. Connect the positive voltmeter lead to the black/yellow terminal and the negative lead to the green/black...
Idle Speed Solenoid Control Valve Accord 1985 The idle control solenoid valve opens when the coolant temperature is below 15°C. If the coolant temperature is below the DOC, it is initiated only when the atmospheric pressure is 660 mmHg. and less. In any...
Idle solenoid valve for automatic transmission Accord 1985 The automatic transmission control solenoid valve is initiated when the automatic transmission lever is in position D4, D3,2 and R. In this case, the solenoid valve opens allowing vacuum into the #18 vacuum...
Air conditioning idle control solenoid valve Accord 1985 The air conditioning idle control solenoid valve is initiated when the air conditioner is turned on. When the solenoid valve opens, vacuum is drawn into hose #19 between the solenoid valve and the idle...
Fast idle valve Accord 1985-89 and Prelude 1986-89 The fast idle valve is set at the factory and should not be reset. Check the piping of the positive crankcase ventilation system for kinks, disconnections, blockages, etc. Check the...
Air damper Accord 1985-89 and Prelude 1986-89 1. With the engine off, slowly open the throttle until the damper link is fully up. 2. Release the throttle and note the time it takes for the throttle to touch the stop screw. This...
Fuel injection test Accord 1985-89 and Prelude 1986-89 Check the following elements of the system before checking the idle speed: ignition timing, valve clearance and CO content in the exhaust at idle. 1. If the engine will run, disconnect...
Fuel system resistor Accord 1985-89 and Prelude 1986-89 1. Disconnect the resistor connector. 2. Check the resistance between each terminal of resistors E, D, C and B and electrical contact A. The resistance should be 5-7 ohms. 3. If any...
Checking the main relay Accord 1985-89 and Prelude 1986-89 1. Remove the main relay located near the fuse box under the dash. 2. Connect the positive battery terminal to terminal 4 and the negative terminal to terminal #8 of the main relay. 3....
Checking wiring harnesses Accord 1985 1. Leave the ignition off. 2. Disconnect the main relay connector. 3. Connect the tester's positive lead to the yellow/blue wire in the connector and to the ground wire - the tester's negative lead. The...