74 - System Control Mode Timeout

Test 1-2:

Test 3-6:

Test 7:

SYMPTOM
SYSTEM CONTROL MODE TIMEOUT - 74

WHEN MONITORED
Ignition on.

SET CONDITION
When vehicle is in antilock control mode. Vehicle speed is above 4 mph for 2 seconds. ABS mode is in continuous pressure control mode for an excessive period of time (two minutes.)

POSSIBLE CAUSES
- TONE WHEEL DAMAGE/MISSING
- FOUNDATION BRAKE FAULTS
- WHEEL BEARING LOOSE/BINDING
- WHEEL SPEED SENSOR CONCERN
- CAB - NO RESPONSE TO INPUT
- BRAKE LAMP SWITCH
- BRAKE SWITCH SENSE CIRCUIT
- CAB - INTERNAL FAULT