SureTrack™ Real Fixes of the Week – 5/6/13
Below is a sampling of Real Fixes that can be found in Mitchell 1′s new SureTrack™ product. These documented issues from actual shop repair orders demonstrate how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available as a special free preview in our ProDemand product.
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Vehicle
2007 GMC Yukon Denali 6.2
System
Suspension
Title
C0660, Replaced Level Ride Compressor Assembly
Complaint
The customer states the suspension warning light is on.
Cause
Connected a scan tool and found code C0660 – Level Control Exhaust Valve Circuit. Performed a visual inspection of the exhaust valve solenoid and found the valve leaked when turned off. Used the scan tool to command the exhaust valve solenoid on and used a test light to check for power and ground at the exhaust valve solenoid. The testing verified both power and ground were present at the exhaust valve solenoid. Used a multi-meter to check the resistance of the exhaust valve solenoid and found the measured resistance was greater than the maximum specified value of 45 ohms. The exhaust valve solenoid is integrated into the level ride compressor assembly and is replaced as an entire unit.
Correction
Replaced the level ride compressor assembly, cleared codes, performed a road test and verified the vehicle operated properly. The suspension warning light did not illuminate and no fault codes returned.
Vehicle
2004 Pontiac Grand Prix GT 3.8L
System
Brakes
Title
C0050, Replaced Right Rear Hub and Bearing Assembly
Complaint
The customer states the anti-lock brake system (ABS) and traction lights are on.
Cause
Connected a scan tool and found code C0050 – Right Rear Wheel Speed Circuit Malfunction. Performed a road test while monitoring wheel speed sensor live data on the scan tool and observed no signal output from the right rear wheel speed sensor. Used a multi-meter to check resistance of the right rear wheel speed sensor and found the measured resistance was not within the specified range of 800-1600 ohms. The wheel speed sensor is integrated into the hub and bearing assembly and is replaced as an entire unit.
Correction
Replaced the right rear hub and bearing assembly, cleared codes, performed a road test and verified the vehicle operated properly. The ABS and traction lights did not illuminate and no fault codes returned
Vehicle
2006 GMC Sierra 1500 5.3
Title
P0171, Cleaned Fuel Rail
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P0171 – System Too Lean (Bank 1). Monitored live data on the scan tool and found the long term fuel trim (LTFT) and short term fuel trim (STFT) corrections were at +25%, the specified range was 0 to +/-10%. Continued to monitor the live data, and found the upstream oxygen sensors (B1-S1) and (B2-S1) signal voltages were biased lean. The oxygen sensor voltages were less than 500 mV and did not switch from high to low as intended. Performed a visual inspection of the air intake system, checked for leaks and visible damage, but no faults were found. Performed a visual inspection of the mass airflow (MAF) sensor to check for contamination and found none. Attached a smoke machine to the intake manifold to check for leaks, and found the intake manifold was sealed. Attached a fuel pressure gauge to the fuel rail and performed an injector pressure balance test, the results revealed unequal pressure drops between the fuel injectors. Removed the fuel rail for inspection, and found contaminates in the rail and on top of the injectors.
Correction
Cleaned the fuel rail, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.
Vehicle
2003 Chevrolet Silverado 4.3L
System
Engine
Title
P0300, Replaced Fuel Injector #5
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P0300 – Random/Multiple Cylinder Misfire Detected. Used the scan tool to monitor engine misfire data, and found cylinder #5 misfired. Performed a visual inspection of the ignition system, but found no obvious faults. Connected a spark tester at cylinder#5, and found that spark was present. Connected a noid light to fuel injector #5, and found the injector pulse signal from the powertrain control module (PCM) was present. Connected a fuel pressure gauge, and performed a fuel injector balance test with the scan tool. Found the fuel pressure failed to drop when fuel injector #5 was actuated. This test confirmed fuel injector #5 was defective.
Correction
Replaced fuel injector #5, cleared codes, test drove the vehicle and completed the code set enable criteria. The check engine light did not illuminate and no fault codes returned.
SureTrack™ is a ground-breaking all-in-one repair information resource that brings together a unique combination of intelligence and expertise to help aftermarket automotive shops increase accuracy and efficiency from diagnosis to completed repair.