IAB System Inspection (Integra GS-R)
- IAB control solenoid valve is located on top of intake manifold. Start and idle engine. Disconnect vacuum hose from IAB control diaphragm. See Figure. Connect vacuum gauge to hose. If vacuum exists, go to step 7). If vacuum does not exist, go to next step.
- Remove vacuum hose from IAB vacuum storage tank. If vacuum is present, go to next step. If vacuum is absent, repair vacuum hose between vacuum source and vacuum tank.
- Turn ignition off. Unplug 2-pin connector from IAB control solenoid valve. Turn ignition on. Measure voltage between solenoid harness connector terminals. If battery voltage does not exist, go to next step. If battery voltage exists, Replace IAB control solenoid valve.
- With ignition on, measure voltage between Red/Blue wire at IAB control solenoid harness connector and body ground. On Integra GS-R, if battery voltage exists, go to next step. On Integra GS-R, if battery voltage does not exist, repair open or short in Red/Blue wire (Pink/Blue at PCM) between IAB solenoid connector and PCM harness connector.
- Turn ignition off. Check for continuity between Black wire at IAB solenoid valve harness connector and body ground. If continuity exists, substitute a known-good PCM and recheck for symptom. If continuity does not exist, repair open ground wire between IAB solenoid valve harness connector and chassis ground point.
- Turn ignition on. Connect jumper wire between PCM terminals A9 and A26. See Figure. If solenoid clicks when jumper wire is connected, substitute a known-good PCM and recheck operation. If solenoid valve does not click, repair open circuit between harness connector Pink/Blue wire and PCM terminal A17.
- Increase engine speed to 6000 RPM. Check for vacuum at IAB control diaphragm hose. If there is no vacuum, system is okay. If vacuum exists, unplug 2-pin connector from IAB control solenoid valve. If vacuum still exists, replace IAB control solenoid valve. If vacuum does not exist, check IAB control solenoid wires for short to power or ground. If wires are okay substitute a known-good PCM and recheck operation.