ENGINE WILL NOT START
Check spark and fuel systems as outlined in BASIC TESTING and SYSTEM/COMPONENT TESTS articles in this section. Test ECU power and ground circuits. On Accord and Prelude, check TDC/CRANK/CYL sensor and ignition output circuits.
Accord
Check coolant temperature, MAP, atmospheric pressure and TDC/CRANK/CYL sensor circuits for malfunctions. Also check fast idle and air boost valves for proper operation.
Civic & CRX 1.5L (TBI)
Check MAP and coolant temperature sensors and Electronic Air Control Valve (EACV).
Civic & CRX 1.5L & 1.6L (PFI)
Check fuel injectors and MAP and coolant temperature sensors.
Prelude
Check coolant temperature, TDC/CRANK/CYL, atmospheric pressure and MAP sensors.
Accord, Civic & CRX
Check Electric Air Control Valve (EACV) and fast idle and air boost valves for proper operation. Also check coolant temperature sensor circuit for short circuit to power or ground.
Check Electronic Air Control Valve (EACV), fast idle valve, idle adjusting screw and coolant temperature sensor.
ROUGH IDLE WHEN WARM
Check Electric Air Control Valve (EACV), MAP sensor, fuel injectors and EGR system for proper operation.
Check Electric Air Control Valve (EACV) and fast idle and air boost valves for proper operation.
Civic & CRX
Check Electric Air Control Valve (EACV), electric load detector and fast idle and air boost valves for proper operation. Also check coolant temperature sensor circuit.
Check Electronic Air Control Valve (EACV), fast idle valve, oil pressure switch signal, vacuum hose connections and A/C signal circuit.
Check Electric Air Control Valve (EACV), fuel injector circuit, A/C signal circuit and electric load detector.
Check Electronic Air Control Valve (EACV), fuel injectors, oil pressure switch and A/T position signal and A/C signal circuits.
Check Electric Air Control Valve (EACV), fast idle valve, air boost valve and fuel system. Also check coolant temperature sensor.
Check Electronic Air Control Valve (EACV), ignition output signal and MAP sensor.
Check Electronic Air Control Valve (EACV), fast idle valve, air boost valve and fuel system.
Check Electronic Air Control Valve (EACV), fuel system and coolant temperature sensor operation.
Check fuel system, air boost valve, Electric Air Control Valve (EACV) and EGR control system. Also check atmospheric pressure sensor.
Check Electronic Air Control Valve (EACV), fuel system and EGR system.
Check Electronic Air Control Valve (EACV), air boost valve, fuel system and EGR system.
Check idle adjustments, fuel system, Electronic Air Control Valve (EACV), EGR system and atmospheric pressure sensor.
Accord & Prelude
Check fuel injectors, Electric Air Control Valve (EACV) and EGR system. Also check TDC/CRANK/CYL sensor for circuit integrity.
Check fuel system, EGR system and Electronic Air Control Valve (EACV).
Check fuel injectors, Electronic Air Control Valve (EACV) and EGR system.
Check MAP sensor and oxygen sensor. Also check emission control and fuel systems.
Check fuel system, MAP sensor and oxygen sensor.
Check fuel injectors, MAP sensor and oxygen sensor.
Check fuel injectors, MAP sensor, oxygen sensor, Electric Air Control Valve (EACV) and all other emission control systems.
LACK OF POWER
Check MAP sensor, throttle angle sensor, fuel injectors, air intake system and all emission control systems.