Filed Under (Pontiac) by admin on 29-05-2010
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step. 2. Turn ignition off. Spray right front wheel speed sensor jumper harness thoroughly with a 5 percent saltwater solution (2 teaspoons of salt to 12 ounces of water). Disconnect EBCM/EBTCM connector C1 (“W” body), connector C2 (“J” body, Cutlass and Malibu) or 32-pin connector (Achieva, Alero, Grand Am and Skylark). See EBCM/EBTCM LOCATION under REMOVAL & INSTALLATION. Using DVOM, measure resistance between speed sensor signal high circuit and speed sensor signal low circuit of EBCM/EBTCM connector. On “W” body, resistance should be 1020-1137 ohms at 68°F (20°C). On “J” body, Achieva, 1998 Grand Am and Skylark, resistance should be 1530-1870 ohms at 68°F (20°C). On Alero, Cutlass, 1999 Grand Am and Malibu, resistance should be 950-1250 ohms at 68°F (20°C). If resistance falls within this specified range, go to next step. If resistance is not within this specified range, go to step 11) .
Filed Under (Ford) by admin on 27-04-2010
FORD: 1990-1997 THUNDERBIRD 1990-1999 MUSTANG, TAURUS SHO 1991-1999 CROWN VICTORIA, ESCORT, TAURUS 1992-1994 TEMPO 1993-1997 PROBE 1995-1999 CONTOUR 1990 BRONCO II 1990-1997 AEROSTAR 1990-1999 RANGER 1991-1999 EXPLORER 1994-1996 BRONCO 1994-1997 F SUPER DUTY, F-250 HD 1994-1999 ECONOLINE, F-150, F-250 LD, F-350 1995-1999 WINDSTAR 1997-1999 EXPEDITION 1999 F-250 HD, SUPER DUTY F SERIES
LINCOLN: 1991-1999 CONTINENTAL, TOWN CAR 1993-1998 MARK VIII 1998-1999 NAVIGATOR
MERCURY: 1990-1997 COUGAR 1991-1999 GRAND MARQUIS, SABLE, TRACER 1992-1994 TOPAZ 1995-1999 MYSTIQUE 1997-1999 MOUNTAINEER
ISSUE SERVICE TIP
This TSB article is a diagnostic procedure to address vehicles that exhibit lean driveability MASS AIR FLOW (MAF) DISCUSSION symptoms and may or may not have any Diagnostic MAF sensors can get contaminated from a variety Trouble Codes (DTCs) stored in memory. of sources: dirt, oil, silicon, spider webs, potting
compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer Follow the diagnostic procedures described in the function such that the sensor over-estimates air flow following Service Tip. The revised diagnostic at idle (causes the fuel system to go rich) and procedure is a more accurate means of diagnosing under-estimates air flow at high air flows (causes
the symptoms. fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idle and learn rich (positive) corrections at higher air flows.
Filed Under (Jeep) by admin on 10-06-2010
1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is “0″, go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not “0″, go to step 7). 2. Ensure ignition is off. Remove ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ASD relay control circuit. Perform TEST VER-2A.
Filed Under (Jeep) by admin on 28-05-2010
The TCM is reporting internal errors. Diagnostic Procedure 1. Turn ignition switch to LOCK position. Remove transmission control relay. Measure resistance between ground and relay ground circuit (Black/Yellow wire) in relay connector. If resistance is greater than 5 ohms, repair open circuit. If resistance s not greater than 5 ohms, go to next step. 2. The TCM has an internal problem and must be replaced. P0715: INPUT SPEED SENSOR ERROR Circuit Description DTC P0715 will set if an excessive change in input RPM has been detected in any gear. Possible Causes Intermittent wiring and connector problems. Faulty input speed sensor. Input speed sensor circuits shorted to ground, shorted to voltage, or open. Faulty TCM.
Filed Under (Pontiac) by admin on 06-10-2010
CONDITION & POSSIBLE CAUSE CORRECTION Hard Starting Binding carburetor linkage Eliminate binding Binding choke linkage Eliminate binding Binding choke piston Eliminate binding Restricted choke vacuum Check vacuum lines for blockage Worn or dirty needle valve and seat Clean carburetor, see ENGINE PERFORMANCE Float sticking Readjust or replace float see the ENGINE PERFORMANCE section Incorrect choke adjustment Reset choke adjustment see ENGINE PERFORMANCE Defective coil Replace coil Improper spark plug gap Regap spark plugs Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Detonation Over-advanced ignition timing Reset ignition timing see ENGINE PERFORMANCE Defective spark plugs Replace spark plugs Fuel lines clogged Clean fuel lines EGR system malfunction Check and repair EGR system PCV system malfunction Repair PCV system Vacuum leaks Check and repair vacuum system Loose fan belts Tighten or replace fan belts, see ENGINE PERFORMANCE Restricted airflow Remove restriction Vacuum advance malfunction Check distributor operation Dieseling Binding carburetor linkage Eliminate binding Binding throttle linkage Eliminate blinding Binding choke linkage or fast idle cam Eliminate binding Defective idle solenoid Replace idle solenoid see ENGINE PERFORMANCE Improper base idle speed Reset idle speed, see see ENGINE PERFORMANCE Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Incorrect idle mixture setting Reset idle mixture, see ENGINE PERFORMANCE Faulty Acceleration Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Engine cold and choke too lean Adjust choke and allow engine to warm-up Defective spark plugs Replace spark plugs Defective coil Replace coil