Reading and Clearing Diagnostic Trouble Codes
THE DRBIIThe DRBII must be used to diagnose problems in the A-604 system. The tester is connected to the Chrysler C2D Bus connector located under the dash. It is important to remember not to use the engine diagnostic connector located under the hood.
The following is a brief description of DRBII capabilities:
Diagnostic Test - This capability allows the technician to read and erase fault codes stored in the A-604 Controller's memory.
Circuit Actuation Test - This capability allows the technician to turn on and off (toggle) certain A-604 components. This ability allows easier and more accurate testing of those circuits.
Switch Test - This capability allows the technician to view various changing switch positions as seen by the controller.
Sensor Test - This capability allows the technician to monitor A-604 sensors on the DRBII display.
Engine Running Test - This capability allows the technician to see various sensor signals received by the A-604 controller. Also, certain A604 components may be actuated by the technician during this mode.
There are different manufacturers of diagnostic read-out boxes which can be used on Chrysler cars. It is important to remember that A-604 diagnostics are available only through equipment that can communicate on Chrysler's Bus. This diagnostic test procedure has been designed specifically to be used with Chrysler's DRBII.
Connecting The DRBII To The Vehicle
The DRBII is connected to the vehicle through the bus connector located under the dash. This blue connector must not be confused with the familiar SCI connector found under the hood which is used to access the engine controller (SMEC).
A special adapter cable (supplied with the DRBII) is needed to interface with the bus connector. No other power supply or connection is needed.
Operation Of The DRBII
Once connected to the bus connector, the ignition switch is turned to the run position. A Chrysler logo and system level number similar to the following will be displayed:
1989
SERVICE DIAGNOSTICS
COPYRIGHT 1987,1988
CHRYSLER CORP. V2.O
NOTE: Revision level subject to change.
After a few seconds, the display will change to read the following:
SELECT MODEL YEAR
1989
Once the display reads 1989, press the down (yes) key to select that year. After the model year is selected the DRBII display will read:
SELECT SYSTEM
TRANSMISSION
Other systems such as Engine or Body may be selected using here by again using the F1 or F2 keys on the DRBII. The next window displays:
SELECT MODULE
A604 TRANSAXLE
PRESS F1, F2 FOR MORE
Press the down (yes) key..
After selecting A604 Transaxle, BUS testing begins. This display is automatic and requires no action on the part of the technician. The Bus Test screen...
TEST OF CCD BUS
IN PROGRESS
... is followed by:
TEST OF CCD BUS
COMPLETED
BUS OPERATIONAL
NOTE: If the Bus Test screen indicates a bus fail message the red L.E.D. on the DRBII will come on, further testing of the automatic transaxle will be blocked and failed bus diagnostics will have to be performed.
After a short pause and a successful Bus Test, the DRBII will automatically display:
AUTO TRANSAXLE
VERSION 02
NOTE: Version number subject to change.
Followed by:
AUTO TRANSAXLE
P/N XXXXXXX
Where XXXXXXX is the part number of the vehicle's A-604 Controller. After a short pause, the DRBII will automatically display
SELECT TEST
DISPLAY FAULT CODES
PRESS F1,F2 FOR MORE
From this point, you may drop into a display of stored transaxle fault codes by pressing the YES key. If there is more than one code in memory, the fault that occurred most recently will be displayed. Other fault codes can be displayed by pressing the left (F1) or the right (F2) arrow keys.
Pressing the NO button from here moves you back up to the SELECT TEST level. Moving right or left while at this level will make the following tests available:
DISPLAY FAULT CODES View any stored fault codes here.
CLEAR FAULT CODES Drop into this area to erase stored fault codes.
SHIFT LEVER TEST Allows you to view the shift lever position as seen by the A-604 Controller.
PRESSURE SWITCH TESTS Allows you to view A-604 pressure switches as seen by the A-604 Controller.
SHIFT LEVER STATUS The DRBII displays current shift lever position and shift lever switch states.
SENSOR TESTS The output of various sensors and switches can be viewed here.
RPM DISPLAY Read engine, turbine and output speed sensors simultaneously.
PRESSURE TESTS Command various hydraulic circuits via solenoids through the electronics of the A-604 Controller.
The DRBII Limp-in Indicator Lamp
Once the DRBII is in the AUTOMATIC TRANSAXLE section, it will constantly monitor the A-604 Controller to see if the system is in limp-in. If transaxle limp-in occurs, the DRBII will turn on its red LED indicator.
The following fault codes will cause the transaxle to go into limp-in:
11 13 14 15 16 17 18 20 21 22 23 24 25 26 27 31 32 33 39 41 42 43 44.
The following fault codes will not cause the transaxle to go into limp-in:
12 19 28 29 37 38 46.
HOW TO USE THE DRBII VOLT/OHMMETER
The Volt/Ohmmeter function can only be turned on at the Select Test level or below.
NOTE: The Volt/Ohmmeter function will not operate in the Display Fault Code or the Clear Fault Code section.
Making Voltage Measurements
1. Connect the Volt/Ohmmeter test lead to the DRBII.
2. Press the Volt/Ohm key on the keypad once.
NOTE: The DRBII will remember what Test Mode you are in while in the Volt/Ohmmeter function.
3. Touch the test probe to the connector or wire to be measured and read the results on the DRBII display.
4. After all measurements have been made, press the Volt/Ohm key twice to return to the Test Mode you left before you entered the Volt/Ohmmeter function.
Making Ohmmeter Measurements
1. Connect the red Volt/Ohmmeter test lead to the DRBII.
2. Press the Volt/Ohm key on the keypad twice.
NOTE: Because of the way the DRBII Ohmmeter is configured (one lead), you will only be able to test wires or components to ground.
3. Touch the red test probe to the wire or component you wish to test and read the resistance to ground on the DRBII display.
4. After all measurements have been made, press the Volt/Ohm key once to return to the Test Mode you were in before you entered the Volt/Ohmmeter function.