Diagnostic Circuit Check

Diagnostic Circuit Check:

PROBLEM IDENTIFICATION
The "Diagnostic Circuit Check" is an organized approach to identifying a problem created by an ABS malfunction. It must be the starting point for any ABS complaint diagnosis, because it directs the service technician to the next logical step in diagnosing the complaint. The "Scan Data" listed in the table may be used after completing the "Diagnostic Circuit Check" and finding the on-board diagnostics functioning properly and diagnostic trouble codes (DTCs) displayed. Only the parameters listed below are used in this manual for diagnosing. If a scan tool other than TECH 1 is used and reads other parameters, the values are not recommended by Delphi Chassis for use in diagnosing. A TECH 1 that displays faulty data should not be used, and the problem should be reported to the manufacturer. The use of a malfunctioning TECH 1 can result in misdiagnosis and unnecessary parts replacement.


SCAN POSITION AND UNITS DISPLAYED
FRONT WHL SPEEDS: MPH/KPH
REAR WHL SPEEDS: MPH/KPH
VEHICLE SPEED: MPH/KPH
ABS WARNING LIGHT: ON/OFF
ABS ACTIVE LIGHT: ON/OFF
4WD LAMP: ON/OFF
ACCELEROMETER: VOLTS
LF MOTOR COMMAND FOOD/REV: AMPS
LF MOTOR FEEDBACK: AMPS
RF MOTOR COMMAND FOOD/REV: AMPS
RF MOTOR FEEDBACK: AMPS
REAR MOTOR CMD FOOD/REV: AMPS
REAR MOTOR FEEDBACK: AMPS
L FRONT SOLENOID: ON/OFF
R FRONT SOLENOID: ON/OFF
REAR SOLENOID: ON/OFF
BRAKE SWITCH: ON/OFF/CIRCUIT OPEN
ENABLE RELAY CMD: ON/OFF
ABS BATT VOLTAGE: VOLTS
ABS IGN VOLTAGE: VOLTS