DTC P1491: EGR Valve Lift Insufficient Detected

Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING CODES . Connect SCS Service Connector (07PAZ-0010100 ) to 2-pin service check connector, located under passenger side of instrument panel. See Figure. Start engine and hold at 3000 RPM with no loads and transmission in Park or Neutral, until cooling fan comes on. Test drive vehicle for approximately 10 minutes with engine speed at 1700-2500 RPM. If DTC P1491 resets, go to next step. If DTC P1491 does not reset, problem is intermittent, system is okay at this time. Check for poor connections or loose wires between EGR valve and PCM connectors.
Start engine and allow to idle. Measure voltage between EGR valve 6-pin connector terminals No. 4 (Pink wire) and No. 6 (Black wire). If battery voltage is not present, go to next step. If battery voltage is present, substitute a known-good PCM and recheck. If DTCs do not reset, replace original PCM.
Turn ignition off. Disconnect EGR valve 6-pin connector. Using a jumper wire, connect battery voltage to EGR valve 6-pin connector terminal No. 4 (Pink wire). Start engine and allow to idle. Using a jumper wire, connect battery ground to EGR valve 6-pin connector terminal No. 6 (Black wire). If engine stalls or runs rough, go to next step. If engine does not stall or run rough, replace EGR valve.
Turn ignition off. Disconnect PCM 32-pin connector. See Figure. Check for continuity between PCM 32-pin connector terminal No. 7 (Pink wire) and EGR valve 6-pin connector terminal No. 4 (Pink wire). If continuity exists, go to next step. If continuity does not exist, repair open in Pink wire between EGR valve and PCM.
Check for continuity between ground and EGR valve 6-pin connector terminal No. 6 (Black wire). If continuity does not exist, repair open in Black wire between EGR control solenoid valve and G101 ground located on thermostat housing. If continuity does not exist, substitute a known-good PCM and recheck. If DTCs do not reset, replace original PCM.