CRX L4-1488cc 1.5L SOHC (EW1) 3V Carb (1986)
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Fast Idle Valve: Testing and Inspection
Fast Idle Control Solenoid Valve
Fuel Injected Engine
Fig. 23 System checker harness terminal identification
Exc. 1987---88 Accord & Prelude
Before proceeding with test, ensure coolant temperature is above 5°F or below 104°F and atmospheric pressure is below 25.98 inches Hg.
1.
Connect system checker harness between ECU and wire harness coupler.
2.
Start engine, then measure voltage between terminal B4 (blue/black (+) and terminal A18 (black/red (-) of system checker harness, Fig. 23.
Voltage should be 0.5---1.5 volts.
3.
If voltage is greater than 9 volts, replace ECU. If no voltage is present, proceed as follows:
a. Check for open circuit in black/yellow wire between fuse and fast idle control solenoid valve.
b. Check for open circuit in blue/black wire on 1985 Accord models, red/green wire on 1986 Accord and 1986---87 Prelude models or
green/yellow wire on Civic and CRX models between fast idle control solenoid valve and ECU.
c. Check for open circuit in fast idle control solenoid valve.
Carbureted Engine
Fig. 23 System checker harness terminal identification
Exc. 1987---88 Accord & Prelude
Before proceeding with test, ensure coolant temperature is above 5°F or below 104°F and atmospheric pressure is below 25.98 inches Hg.
1.
Connect system checker harness between ECU and wire harness coupler.
2.
Start engine, then measure voltage between terminal B4 (blue/black (+) and terminal A18 (black/red (-) of system checker harness, Fig. 23.
Voltage should be 0.5---1.5 volts.
3.
If voltage is greater than 9 volts, replace ECU. If no voltage is present, proceed as follows:
a. Check for open circuit in black/yellow wire between fuse and fast idle control solenoid valve.
b. Check for open circuit in blue/black wire on 1985 Accord models, red/green wire on 1986 Accord and 1986---87 Prelude models or
green/yellow wire on Civic and CRX models between fast idle control solenoid valve and ECU.
c. Check for open circuit in fast idle control solenoid valve.
