Tech Tip: Stud Shearing Problems
During installation, carefully inspect the position of the mount’s recessed slots at the bottom of the mounting plate.
GM Tech Tip: Lin Bus Diagnostics
As more smart motors, switches and sensors are being used, there are more Local Interconnect Network (LIN) buses on vehicles.
Toyota Tech Tip: ABS Noise, Warning Lamps And Code C1431
Some 2012-’13 model year Camry vehicles may exhibit a condition where ABS brake actuator pump motor noise is heard from the engine compartment with Brake ABS and/or TRAC warning lamp(s) illuminated and DTC C1431 stored. A poor ground on the left fender side panel bracket may cause this condition after a collision repair.
Nissan Tech Tip: Permanent DTC (P-DTC) Information
Starting with 2010 Model Year, Nissan vehicles have been gradually incorporating a new type of DTC known as “Permanent DTC or P-DTC.” If a vehicle is equipped with P-DTCs, all emission-related DTCs will also set a P-DTC if the MIL is turned on.
GM Tech Tip: Black Smoke And Rough Idle On Cold Start
The driver will complain that during a cold start black smoke will come from the exhaust and the engine will have a rough idle and minimal misfires. With the introduction of direct fuel injection systems, GM has revised the cold start control system to reduce cold start emissions. Quicker catalytic converter heating helps meet the ever-changing emission requirements and improve fuel economy.
Hyundai Tech Tip: Engine Vibration Due To Misaligned Timing Marks On The Oil Pump
This bulletin provides information regarding the proper indexing of the timing marks of the Oil Pump Module during in-vehicle installation on vehicles equipped with Theta four-cylinder engines. If the Oil Pump Module timing marks are improperly indexed, abnormal engine vibration may result. Follow the service information outlined in this bulletin whenever a new or existing Oil Pump/Balance Shaft Module (BSM) is being installed.
GM Tech Tip: Cold Start Misfires
An owner may complain of misfire or roughness during a cold start. Also, a P0300 code might be present, or there may be misfire codes limited to one or two cylinders. Looking at the misfire counter on a scan tool, you will see a high rate on typically one cylinder. The cause of the misfires might be a coolant leak that allows coolant to enter the cylinder at the point where the liner meets the deck face cast.
