A/T Idle Boost Solenoid
- Open control box. Disconnect lower vacuum hose from idle boost solenoid. Connect vacuum pump. See Fig 1
. Disconnect the upper vacuum hose at the intake manifold. Connect vacuum gauge.
- Start engine. Apply vacuum. If vacuum is indicated on gauge, go to step 5). If vacuum is not indicated on gauge, disconnect 8-wire connector at control box. Measure voltage between Yellow/White (pos.) and Black (neg.) terminals of control box wire harness. If battery voltage is present, replace solenoid.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- If battery voltage is not present, measure voltage between ground and Yellow/White wire terminal of harness. If voltage is now present, repair open Black wire between harness connector and ground.
- If battery voltage is not present, inspect Yellow/White wire of harness between harness connector and ECU terminal No. 19. If harness is okay, fault is in ECU control circuit. Go to TROUBLE SHOOTING
.
- If vacuum was indicated on gauge in step 2), warm engine to operating temperature (cooling fan comes on). Apply vacuum to solenoid in Neutral or Park. If solenoid holds vacuum go to step 7). If solenoid does not hold vacuum, disconnect 8-wire connector at control box.
- Measure voltage between Yellow/White (pos.) and Black (neg.) terminals of control box harness. If voltage is present, fault is in ECU control circuit. Go to TROUBLE SHOOTING
. If voltage is not present, replace solenoid.
- If solenoid held vacuum in step 5), Shift transmission into "D" or "D4" position and apply vacuum. If vacuum shows on gauge, check vacuum hose for proper connection, cracks, blockage or disconnection.
- If vacuum does not show on gauge, fault is in ECU control circuit. Go to TROUBLE SHOOTING
.