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(7) Connect vehicle to an oscilloscope and inspect spark events for fouled or damaged spark plugs or (8) Verify generator output wire, generator connec- tor and ground wire are firmly connected to genera- (9) Inspect system body grounds for loose or dirty connections. Refer to Group 8, Wiring for ground (10) Verify crankcase ventilation (CCV) operation. Refer to Group 25, Emission Control System for addi- (11) Inspect fuel tube quick-connect fitting-to-fuel rail connections. (12) Verify hose connections to all ports of vacuum fittings on intake manifold are tight and not leaking. (13) Inspect accelerator cable, transmission throt- tle cable (if equipped) and cruise control cable con- (14) If equipped with vacuum brake booster, verify vacuum booster hose is firmly connected to fitting on intake manifold. Also check connection to brake vac- (15) Inspect air cleaner inlet and air cleaner ele- ment for dirt or restrictions. (16) Inspect radiator grille area, radiator fins and air conditioning condenser for restrictions. (17) Verify intake manifold air temperature sensor wire connector is firmly connected to harness connec- (18) Verify MAP sensor electrical connector is firmly connected to MAP sensor (Fig. 8). Also verify (19) Verify fuel injector wire harness connectors are firmly connected to injectors in correct order. (20) Verify harness connectors are firmly con- nected to idle air control (IAC) motor and throttle (21) Verify wire harness connector is firmly con- nected to engine coolant temperature sensor (Fig. (22) Raise and support vehicle. Fig. 6 Ignition Coil—4.0L Engine 1 – REAR OF VALVE COVER Fig. 7 Intake Manifold Air Temp. Sensor Location— 2.5L Engine 1 – ELECTRICAL CONNECTOR 14 - 38 FUEL SYSTEM XJ DIAGNOSIS AND TESTING (Continued) |