Tech Tip: Caliper Replacement Check List
Check vehicle service information for any special procedures for piston retraction, electronic brake assist system deactivation or proportioning/metering valve reset.
Tech Tip: Nissan Xterra Hesitates Upon Acceleration
The technician connected a scan tool and found code P0102 – Mass or Volume Air Flow “A” Circuit Low. He then performed an inspection of the mass airflow (MAF) sensor and related wiring harness, but found no obvious faults.
Audi Tech Tip: MIL On With P1545, P0121, P0123, P0221 Or P0222 Stored In ECM
The MIL is on, with a number of incident memory entries with regard to the throttle valve are stored in the ECM. In most cases, the entries are sporadic. This may be the result of contact resistance in the ECM wiring – throttle valve.
Fuel Pump Tech Tip: MIL On With DTC P0463 Or Erratic Fuel Gauge Operation
Some 2004-’07 Explorer four door/Mountaineer vehicles may exhibit the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0463 or an erratic fuel gauge concern. This could be from sulphur contamination in the fuel, causing an open or high resistance on the fuel sender card.
Chrysler Tech Tip: ESP Lamp Flashing/ESP Pump Howl
Some drivers may notice a howl or groan sound while driving straight after a low speed spirited turning event. On SRT vehicles only, when the vehicle has been switched to the “Full On” ESP mode, the ESP event lamp continues to flash. This does not affect the functionality of the ESP system in any way. The system can be returned to “normal Full-On” mode by briefly pressing and releasing the ESP Off switch. The system will reset itself each time the ignition is cycled.
Tech Tip: Chrysler’s Engine Experiences No Crank/No Start Condition Due To Electronic Lockup Of WCM/SKREEM
The customer will experience a no engine crank and a no engine start condition. Also, the remote keyless entry (RKE) system will not operate. This condition may be due to an electrostatic discharge (ESD) from the ignition key into the WCM, causing the WCM to electronically lockup. This condition may occur more frequently in dry and/or cold weather conditions where a sufficient electrostatic charge is more easily produced. This condition is corrected by the replacement of the WCM.
Tech Tip: Troubleshooting Common Crank Grinding Problems
Using an improper wheel is most likely to blame for metal particles lodging in abrasive grains or in wheel pores. Try using a wheel with a coarser grit or more open structure to provide chip clearance. Also try using more coolant. Faulty dressing could be another cause of wheel loading. Examine your diamond tool and replace it if it appears to be worn. A worn diamond will appear rounded.
Tech Tip: 4WD Transfer Case Motor Typical Failures And Prevention
This Tech Tip applies to Chevy/GMC, Ford, Mazda and Isuzu 4-wheel-drive vehicles equipped with transfer case motors. Most units fail because of water or mud intrusion. Carefully inspect the motor boot or protective coverings. Be sure the connector seals can keep water and debris out. Check the wiring harness and connector. Replace or repair wiring as necessary. After installation, periodically select 4-wheel-drive mode to ensure operation when needed.
Tech Tip: A Day In The Life Of A Contaminated O2 Sensor
Since the oxygen sensor is in the exhaust stream, it can become contaminated over time. Much like a spark plug, the oxygen sensor can be examined and “read” to determine what the cause of contamination might be.
Tech Tip: Fuel Filler Necks And Related Check Engine Light Conditions
Since the introduction of the OBD II system, manufacturers have continued to improve on the monitoring of evaporative emissions, with the complete evaporative system being under a scrutinized surveillance. Codes like P0440 to P0456 are all related to the fuel vapor control, including leaks.
Volkswagen Tech Tip: Check Engine Light Is On, Trouble Code P2181
Volkswagen owners may complain that the check engine light is on. Potential causes of a trouble code P2181 include the connector, defective coolant temperature sensor (CTS) wiring or defective thermostat.
Tech Tip: Audi 2.8L V6 Rear Crankshaft Seal Leaks After Replacement
Oil may leak from the rear crankshaft seal after seal replacement due to the seal lip rolling while installing the new seal. This condition affects 1996 A4 with 2.8L V6 (Engine Code AFC). When replacing the seal, the new seal is supplied pre-installed in the flange.