ac resistance for grand prix 1999
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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 (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
Filed Under (Jeep) by admin on 14-12-2010
NOTE: NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see GRAND CHEROKEE wiring diagram in WIRING DIAGRAMS article. DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM is monitored during engine cranking. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no Crankshaft Position (CKP) sensor signal during engine cranking, and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes are: defective tone wheel/flexplate, defective PCM, defective CKP sensor, defective CMP sensor, defective connectors or defective wiring. 1. Turn ignition on, with engine off. Using scan tool, read current CKP count and attempt to start engine. If current CKP count does not change while attempting to start engine, go to next step. If current CKP count changes while attempting to start engine, go to step 16). 2. Turn ignition off. Disconnect CKP sensor connector. See Fig. 26 or Fig. 27 . Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, repair open 5-volt supply circuit. Perform TEST VER-5A.
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 (Honda) by admin on 03-01-2011
Spark Check for spark at secondary coil wire and each spark plug wire using a spark tester. If spark is not present, continue with following tests. Check spark plug wire resistance on suspect wires. Resistance should be less than 25,000 ohms. Ignition Coil Power Source 1. On Civic, remove distributor cap to check power source directly at coil. On all models, disconnect ignition coil primary leads. Turn ignition on. Using voltmeter, check voltage between ground and Black/Yellow wire terminal of ignition coil harness. 2. Battery voltage should be present. If battery voltage is not present, check for open in Black/Yellow wire between coil and ignition switch. Ignitor Power Source Turn ignition off. Disconnect harness connector at distributor. Turn ignition on. Using voltmeter, check for battery voltage between ground and Black/Yellow wire of harness. If voltage is not present, check for open in Black/Yellow wire between ignition coil and harness connector. If wire is okay, check ignition coil resistance (for internal short to ground). Ignitor Check Check TDC/CRANK/CYL sensor resistance values. See TACH PULSE SIGNAL . Check power sources. If no problems are found and spark is not present, replace ignitor. Ignition Coil Resistance (Accord & Prelude) 1. Remove primary and secondary leads from ignition coil. Using an ohmmeter, check resistance between primary terminals “A” and “C” (“A” and “B” for Prelude) of ignition coil. See Fig. 2 . Resistance should be .6-.8 ohm at room temperature. 2. On Accord, check resistance between terminals “B” and “D” of ignition coil (tachometer circuit). Resistance should be about 2090-2310 ohms at room temperature. 3. On all models, check secondary resistance between terminal “A” and secondary output terminal (coil tower). See IGNITION COIL RESISTANCE table. Check for continuity between terminals “A” and “B” (“A” and “C” for Prelude). Continuity should exist. If readings are not within specification, replace coil.