FUEL PUMP RELAY Remove relay from vehicle. Connect battery voltage to terminal "C". Ground terminal "D". See Fig. 8 . Measure resistance between terminals "A" and "B". Resistance should be less than one ohm with power applied and greater than 10 k/ohms with power removed.
Page 1 of 1 SYSTEM/COMPONENT TESTS - EEC-IV -1990 Mercury Cougar LS
FUEL INJECTORS (PFI) 1. Connect tachometer to engine. Run engine at idle. Disconnect and reconnect injectors individually. If each injector causes a momentary drop in engine speed of at least 100 RPM, injectors are giving proper fuel delivery. RPM drop should only be momentary as ISC will attempt to re-establish correct idle RPM. 2. Replace any injectors that do not cause sufficient drop in engine speed. When test is complete and all injectors cause equal drop in speed, shut off engine. In order to check curb idle, refer to emission control specifications on decal in engine compartment. Page 1 of 1 SYSTEM/COMPONENT TESTS - EEC-IV -1990 Mercury Cougar LS 3/27/2009
INJECTOR CIRCUIT 1. Disconnect all injector harness connectors. Using digital ohmmeter, check resistance across terminals of each injector. See appropriate injector resistance table. 2. On PFI models, disconnect injector bank harness connector, check resistance of injector bank. See PFI INJECTOR BANK RESISTANCE table. Repair wiring or replace any injector circuit not within specification.
Resistance is,3.0= 15.-18.0
3.8= 13.5-16.0 OHMS
Friday, March 27th, 2009 AT 11:21 AM