Condition some owners may comment on high/erratic idle and/or the mil light on. In some cases, vacuum leak noise may be heard as well. Possible cause there may be poor contact or loss of contact at various main ground points or electrical connections. Power steering pressure switch may be shorted with debris. Inlet manifold gasket may be leaking. Broadcast code and calibration part number may need to be updated. Correction to correct this condition, follow the procedures outlined in this bulletin to determine proper diagnosing, inspection and correction of ground contact points for proper electrical contact, power steering pressure switch cleaning or replacement and power steering system flush, replacement of inlet manifold gasket, and/or pcm reprogramming.
Service procedure 1998 – 2000 models note: please refer to the appropriate workshop manual for the correct diagnosing procedure and/or follow the service procedures outlined in this bulletin for the vehicle being serviced. 1. Inspect main ground points (refer to sb99-04-s001 for more information). P6 ground point-body [on the passenger side of engine compartment, between the battery and cruise control actuator (if equipped)]. (figure fig. 1 ) p10 ground point-engine (at the alternator bracket). (figure fig. 2 ) note: the 1998, 1999 or 2000 rodeo/amigo electrical troubleshooting manual can assist in locating the vehicle ground distribution (i.E., ground contact points). Perform a voltage drop test at the main ground points. If the voltage drop test fails, then inspect and clean both the bolt and contact point. Verify and correct idle settings (if needed) as described in the workshop manual. If the repair procedure on this step solves the high idle condition, then return the vehicle to the customer. If the repair procedure on this step does not solve the high idle condition, then go to step 2 (16 pin blue connector).
A. Locate p-6/p10 ground in the engine compartment. Fig. 2: identifying p-10 ground b. Remove p-6/p-10 ground terminal and bolt for ground contact inspection. Inspect ground contact area for corrosion. Inspect bolt and thread for damage or corrosion. Clean the ground area and fastening bolt thoroughly with a wire brush. Replace bolt if damaged or heavily corroded. C. Install the p-6/p-10 ground terminal and bolt (tighten using hand tools only). Torque the p-6/p-10 ground terminal bolt to (14 n.M) 10 lb.Ft. Important: do not use air/power tools when tightening. Over-tightening may occur. Use only hand tools and torque the bolt by hand. Do not over-tighten or under-tighten the bolt. 1998 – 1999 models only 2. Inspect the 16 pin blue connector, located under the power steering fluid reservoir for corrosion, bent, or damaged pins (specifically for the throttle position sensor). (figure fig. 3 ) a. Disconnect the h-6 connector (16 pin blue connector) and clean with loctite(r)/permatex – electrical contact cleaner or equivalent (p/n 24379 available at your local store). Important: do not use “brake cleaner or carb cleaner.” note: if the repair procedure on this step solves the high idle condition, then return the vehicle to the customer. If the repair procedure on this step does not solve the high idle condition, then go to step 3 (powersteering pressure switch). Fig. 3: disconnecting the h-6 connector 3. Inspect the power steering pressure switch as described in the appropriate workshop manual and/or follow the preceding steps. Note: the power steering pressure switch fault can be diagnosed with high idle condition when in neutral with the idle speed at approximately 1200 rpm. A. Disconnect the power steering pressure switch at the power steering pump and if the idle drops,