Historical Service Codes
Anytime a fault occurs in the system, an active
service code will be displayed on the ECU lights.
Historical codes can only be accessed by a
Historical codes are automatically cleared after
25-50 vehicle starts with no active faults.
Refer to the service code chart (beginning on
page 3-92.18) for more detailed information on
Based upon system schematics and aided by
component-specific service codes, a Multimeter
can be used to check sensor and solenoid
resistances and to find wiring harness faults.
The multimeter can be used to check the Central
Tire Inflation System wiring and components for:
incorrect battery voltage
Change 3 3-92.17