Engine Controls - System/component Tests - 2.6L: Diagnosis Honda Passport I

Fuel Injector Balance Test

1. Connect fuel pressure gauge to fuel rail. Disconnect vacuum hose at pressure regulator. Turn ignition on. Note fuel pressure. Fuel pressure should be 35-38 psi (2.5-2.7 kg/cm 2 ). Start engine. Reconnect vacuum hose. Fuel pressure should decrease slightly. NOTE: Fuel pressure must be correct before proceeding with fuel injector balance test.
2. With ignition off, unplug harness connectors at all injectors. Install Injector Tester (J-34730-3 ) on one injector. Turn ignition on. Bleed off air in fuel pressure gauge. Fuel pump should operate for about 2 seconds.
3. Turn ignition off for 10 seconds. Turn ignition on with engine off. Turn injector on by pressing button on injector tester. Note pressure drop as soon as gauge needle stops. Pressure may increase for a few seconds after initial pressure drop.
4. Injector pressure drop should be similar for all injectors. Replace any injector with more than a 1.45 psi (10 kg/cm 2 ) difference from other injectors.

Scheme 97

1. Check operation of air regulator with engine cold. Start engine and note if idle speed is higher than normal after initial start. If idle speed is not higher, proceed to step 4).
2. As engine temperature increases, engine idle speed should stabilize. Check air regulator for leakage. Disconnect hose between air regulator and throttle valve body at throttle valve body side. Plug throttle body fitting end. (Scheme 97)
3. Start engine. Check for variation in engine speed by closing and opening end of air regulator hose. Variation in engine speed should be less than 50 RPM. Replace air regulator if variation in engine speed is more than specification.
4. If fast idle speed was not higher than normal on initial engine start, disconnect air regulator harness connector at air regulator. Air regulator is located on right rear of engine, below intake manifold.
5. Using ohmmeter, measure resistance between air regulator terminals. Resistance should be 45.5-49.5 ohms. Replace air regulator if resistance is not as specified. If resistance is as specified, go to next step.
6. Turn ignition on. Using a voltmeter, check for voltage at air regulator harness connector. If voltage is present, replace air regulator. If voltage is not present, check wiring to air regulator and fuel pump relay.