Diagnosis & Testing

NOTE: A New Generation Star (NGS) Tester (007-00500) or equivalent is required for testing VAPS system.

Before performing individual component or system tests, check following for possible cause of system malfunction:

Tire Pressure
Mechanical Condition Of Steering
Power Steering Fluid Level
Pump Pressure
Faulty Fuse No. 28 In Fuse Junction Box
Faulty Fuse No. 4 or 11 In Power Distribution Box
Loose Or Corroded Connectors
Damaged Wiring

If problem remains after inspection, connect and operate New Generation Star (NGS) Tester (007-00500) following manufacturer's instructions. Perform data link diagnostics test. See DATA LINK DIAGNOSTIC TEST for 2000 models or DATA LINK DIAGNOSTIC TEST for 2001 models. If scan tool displays CKT 914, CKT 915 or CKT70 - NO RESPONSE/NOT EQUIPPED for vehicle dynamics module, go to TEST A .

If vehicle dynamics module passes data link diagnostics test, retrieve and record continuous Diagnostic Trouble Codes (DTCs) and perform on-demand self test vehicle dynamics module to retrieve current DTCs. See VAPS STEERING DIAGNOSTIC TROUBLE CODE DEFINITIONS table. If no DTCs are displayed, go to SYMPTOM TESTS .

VAPS STEERING DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC	Description
B1317	High Voltage Detected
B1318	Low Voltage Detected
B1342	Vehicle Dynamics Module Defective
C1897	VAPSIII Circuit Failure