14 - 154 FUEL SYSTEMS

A/C Clutch Relay

EGR Solenoid

Auto Shutdown Relay

Fuel Pump Relay

Radiator Fan Relay

Purge Solenoid

Check Engine Lamp

STATE DISPLAY SENSORS

Connect the DRB II tester to the vehicle and access the State Display screen. Then access Sensor Display. The following is a list of the engine control system functions accessible through the Sensor Display screen.

Battery Temp Sensor

Oxygen Sensor Signal

Coolant Temp Sensor Throttle Position Minimum Throttle Battery Voltage MAP Sensor Reading AIS Motor Position Adaptive Fuel Factor Barometric Pressure Min Airflow Idl Spd Engine Speed

DIS Sensor Status Fault #1 Key-On Info Module Spark Advance Speed Control Target Fault #2 Key-on Info Fault #3 Key-on Info Speed Control Status

Speed Control Switch Voltage Overall Knock Retard Charging System Goal

Theft Alarm Status

Map Sensor Voltage Vehicle Speed Oxygen Sensor State MAP Gauge Reading Throttle Opening Total Spark Advance

CIRCUIT ACTUATION TEST MODE

The circuit actuation test mode checks for proper operation of output circuits or devices which the engine controller cannot internally recognize. The engine controller can attempt to activate these outputs and allow an observer to verify proper operation. Most of the tests provide an audible or visual indication of device operation (click of relay contacts, spray fuel, etc.). Except for intermittent conditions, if a device functions properly during testing, assume the device, its associated wiring, and driver circuit working correctly.

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OBTAINING CIRCUIT ACTUATION TEST

Connect the DRB II tester to the vehicle and access the Actuators screen. The following is a list of the engine control system functions accessible through Actuators screens.

Stop All Tests

Ignition Coil #1

Ignition Coil #2

Ignition Coil #3

Fuel Injector #1

Fuel Injector #2

Fuel Injector #3

Fuel Injector #4

Fuel Injector #5

Fuel Injector #6

AIS Motor Open/Close Radiator Fan Relay A/C Clutch Relay Auto Shutdown Relay Purge Solenoid

S/C Serv Solenoids Alternator Field EGR Solenoid

All Solenoids/Relays

ASD Fuel System Test

THROTTLE BODY MINIMUM AIR FLOW CHECK PROCEDURE

(1)Warm engine in Park or Neutral until the cooling fan has cycled on and off at least once.

(2)Ensure that all accessories are off.

(3)Shut off engine.

(4)Disconnect the PCV valve hose from the intake manifold nipple.

(5)Attach Air Metering Fitting #6457 (0.125 in. orifice) to the intake manifold PCV nipple (Fig. 19).

Fig. 19 Air Metering Fitting #6457

(6)Disconnect the 3/16 inch idle purge line from the throttle body nipple. Cap the 3/16 inch nipple.

(7)Connect Diagnostic Readout Box II (DRB II).

(8)Restart the engine. Allow engine to idle for at least one minute.

(9)Using the DRBII, access Min. Airflow Idle Spd.

(10)The following will then occur:

²AIS motor will fully close.

²Idle spark advance will become fixed.

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²Engine RPM will be displayed on DRB II.

(11)If idle RPM is within the range shown in the Idle Specification chart, throttle body minimum airflow is set correctly.

IDLE SPECIFICATIONS

(12) If idle RPM is not within specifications, shut off the engine and clean the throttle body as follows:

(a) Remove the throttle body from engine.

WARNING: CLEAN THROTTLE BODY IN A WELL VENTILATED AREA. WEAR RUBBER OF BUTYL GLOVES, DO NOT LET MOPAR PARTS CLEANER COME IN CONTACT WITH EYES OR SKIN. AVOID INGESTING THE CLEANER. WASH THOROUGHLY AFTER USING CLEANER.

FUEL SYSTEMS 14 - 155

(b)While holding the throttle open, spray the entire throttle body bore and the manifold side of the throttle plate with Mopar Parts Cleaner. Only use Mopar Parts Cleaner to clean the throttle body.

(c)Using a soft scuff pad, clean the top and bottom of throttle body bore and the edges and manifold side of the throttle blade. The edges of the throttle blade and portions of the throttle bore that are closest to the throttle blade when is closed, must be free of deposits.

(d)Use compressed air to dry the throttle body.

(e)Inspect throttle body for foreign material.

(f)Install throttle body on manifold.

(g)Repeat steps 1 through 14. If the minimum air flow is still not within specifications, the problem is not caused by the throttle body.

(13)Shut off engine.

(14)Remove Air Metering Fitting #6457 from the intake manifold PCV nipple. Reinstall the PCV valve hose.

(15)Uncap the throttle body idle purge nipple and connect the idle purge line.

(16)Remove DRB II.

60-WAY ENGINE CONTROLLER WIRING CONNECTOR

Refer to the engine controller wiring connector diagram (Fig. 20) for wire colors and cavity numbers.