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Monthly Archives: April 2015

Five Fast Fixes 4/1/2015

Vehicle:    2005 Lexus GX470 Base 4.7L, V8, MFI, DOHC, Eng Desg 2UZFE Mileage:    116,853 Customer Concern:    The left rear suspension is lower than the rest of the vehicle and there is a code 51. Replaced the left rear air suspension bag but it will not fill up. Tests: 1. Code 51 indicates that the air suspension pump ran for more than 100 seconds but the vehicle height did not change. Determine if the pump is working properly and that it is able to build pressure.  2. Test the rear height control valve and determine if it has battery voltage applied to the Purple/White wire and good ground on the White/Black wire. If so, the control unit is trying to open the valve and direct air to the left rear air suspension bag. If the height control valve has power and ground for the left rear circuit and there is no air coming out to the left rear air suspension bag, the rear ... read more

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