SYSTEM TESTS

Apply parking brake and/or block wheels before performing idle check or adjustment, or any engine running tests.

OBTAINING FAULT CODES

(1)Connect DRBII to the diagnostic connector (Fig. 21 or Fig. 22).

(2)Start the engine if possible, cycle the trans mission selector and the A/C switch if applicable. Shut off the engine.

(3)Turn the ignition switch on, access Read Fault Screen. Record all the fault messages shown on the DRBII. Observe the check engine lamp on the instrument panel. The lamp should light for 2 seconds then go out (bulb check).

Fault code erasure: access erase fault code data.

STATE DISPLAY TEST MODE

The switch inputs used by the engine controller have only two recognized states, HIGH and LOW. For this reason, the engine controller cannot recognize the difference between a selected switch position versus an open circuit, a short circuit, or a defective switch. If the display changes, assume the entire switch circuit to the engine controller is functional. From the state display screen access either State Display Inputs and Outputs or State Display Sensors.

STATE DISPLAY INPUTS AND OUTPUTS

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

Speed Control Resume Brake Switch

Speed Control On/Off Speed Control Set A/C Switch Sense

Z1 Voltage Sense

S/C Vent Solenoid S/C Vacuum Solenoid A/C Clutch Relay

Baro Read Solenoid

Wastegate Solenoid

Auto Shutdown 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 Temperature

Coolant Temp Sensor Throttle Position Minimum Throttle Knock Sensor Signal 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 Cyl 1 Knock Retard Cyl 2 Knock Retard Cyl 3 Knock Retard Cyl 4 Knock Retard Boost Pressure Goal Charge Temperature Charge Temp Sensor Speed Control Target Fault #2 Key-on Info Fault #3 Key-on Info Speed Control Status Charging System Goal Theft Alarm Status Wastegate Duty Cycle Map Sensor Voltage