Jeep Cherokee 1999 Electronic Service Manual page 1214

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DESCRIPTION AND OPERATION
AIR CONDITIONING (A/C) CLUTCH RELAY—
PCM OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . 33
AIR CONDITIONING (A/C) CONTROLS—PCM
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
AUTO SHUTDOWN (ASD) RELAY—PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
AUTOMATIC SHUTDOWN (ASD) RELAY
SENSE—PCM INPUT . . . . . . . . . . . . . . . . . . . 28
BATTERY TEMPERATURE SENSOR—PCM
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
BATTERY VOLTAGE—PCM INPUT . . . . . . . . . . . 28
BRAKE SWITCH—PCM INPUT . . . . . . . . . . . . . . 28
CAMSHAFT POSITION SENSOR—PCM
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
CCD BUS (+/-) CIRCUITS-PCM OUTPUTS . . . . . 34
CRANKSHAFT POSITION SENSOR—PCM
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
DATA LINK CONNECTOR—PCM INPUT AND
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
DUTY CYCLE EVAP PURGE SOLENOID
VALVE-PCM OUTPUT . . . . . . . . . . . . . . . . . . . 34
ENGINE COOLANT TEMPERATURE SENSOR—
PCM INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
EXTENDED IDLE SWITCH—PCM INPUT . . . . . . 30
FIVE VOLT SENSOR SUPPLY—PRIMARY . . . . . 28
FIVE VOLT SENSOR SUPPLY—SECONDARY . . 28
FUEL INJECTORS—PCM OUTPUT . . . . . . . . . . 34
FUEL LEVEL SENSOR—PCM INPUT . . . . . . . . . 28
FUEL PUMP RELAY-PCM OUTPUT . . . . . . . . . . 35
GENERATOR FIELD DRIVER (-)—PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
GENERATOR FIELD SOURCE (+)—PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
GENERATOR LAMP—PCM OUTPUT . . . . . . . . . 35
GENERATOR OUTPUT—PCM INPUT . . . . . . . . . 30
IDLE AIR CONTROL (IAC) MOTOR—PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
IGNITION CIRCUIT SENSE—PCM INPUT . . . . . 30
IGNITION COIL—PCM OUTPUT . . . . . . . . . . . . . 35
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR—PCM INPUT . . . . . . . . . . . . . . . . . . 30
LEAK DETECTION PUMP (SWITCH) SENSE—
PCM INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
LEAK DETECTION PUMP—PCM OUTPUT . . . . . 35
MALFUNCTION INDICATOR LAMP—ECM/PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR—PCM INPUT . . . . . . . . . . . . . . . . . . 31
FU EL I N J ECT I ON SY ST EM
INDEX
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MODES OF OPERATION . . . . . . . . . . . . . . . . . . 25
OIL PRESSURE SENSOR—PCM INPUT . . . . . . 31
OXYGEN SENSOR (HO2S)—PCM INPUT . . . . . 30
POWER GROUND . . . . . . . . . . . . . . . . . . . . . . . 31
POWER STEERING PRESSURE SWITCH—
PCM INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
POWERTRAIN CONTROL MODULE (PCM) . . . . 24
RADIATOR FAN RELAY—PCM OUTPUT . . . . . . 35
SENSOR RETURN—PCM INPUT . . . . . . . . . . . . 32
SPEED CONTROL SOLENOIDS—PCM
OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SPEED CONTROL SWITCHES—PCM INPUT . . . 32
TACHOMETER—PCM OUTPUT . . . . . . . . . . . . . 35
THROTTLE BODY . . . . . . . . . . . . . . . . . . . . . . . 35
THROTTLE POSITION SENSOR (TPS)—PCM
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TRANSMISSION PARK/NEUTRAL SWITCH—
PCM INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
VEHICLE SPEED AND DISTANCE SENSOR—
PCM INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
DIAGNOSIS AND TESTING
ASD AND FUEL PUMP RELAYS . . . . . . . . . . . . . 39
ENGINE COOLANT TEMPERATURE
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
EXTENDED IDLE SWITCH TEST . . . . . . . . . . . . 43
IDLE AIR CONTROL (IAC) MOTOR . . . . . . . . . . . 42
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR TEST . . . . . . . . . . . . . . . . . . . . . . . . 40
OXYGEN (O2S) SENSORS . . . . . . . . . . . . . . . . 41
POWER STEERING PRESSURE SWITCH . . . . . 42
THROTTLE BODY MINIMUM AIR FLOW
CHECK PROCEDURE . . . . . . . . . . . . . . . . . . . 44
THROTTLE POSITION SENSOR (TPS) . . . . . . . 44
VEHICLE SPEED SENSOR . . . . . . . . . . . . . . . . 43
VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . 36
REMOVAL AND INSTALLATION
AIR CLEANER ELEMENT (FILTER) . . . . . . . . . . 49
AUTOMATIC SHUTDOWN (ASD) RELAY . . . . . . 45
DUTY CYCLE EVAP CANISTER PURGE
SOLENOID . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
ENGINE COOLANT TEMPERATURE SENSOR . . 50
FUEL PUMP RELAY . . . . . . . . . . . . . . . . . . . . . . 45
IDLE AIR CONTROL (IAC) MOTOR . . . . . . . . . . . 47
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
FUEL SYSTEM 14 - 23
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