Test 1A - Reading Fault Messages

TEST 1A READING FAULT MESSAGES
Perform VISUAL INSPECTION Before Proceeding

Read faults. See HELP 1 for assistance. If there are no fault messages present, perform TEST 23A.

In some instances the cause of one fault message may trigger the setting of an additional fault message. If multiple fault messages appear on the DRBII when reading faults, fault repairs must be performed in the order in which they are displayed in the chart below. If only one fault has occurred, perform the indicated test for that fault message.

NOTE: If a fault has occurred more than 2 key cycles ago, perform the Verification Test procedure (TEST VER-1) before any attempt is made to diagnose that particular fault message.

FAULT MESSAGES

CAB FAULT PERFORM TEST 2A
MODULATOR FAULT PERFORM TEST 3A
SOLENOID UNDERVOLTAGE FAULT PERFORM TEST 4A
LOW FLUID/PARKING BRAKE FAULT PERFORM TEST 5A
SYSTEM RELAY FAULT PERFORM TEST 6A
LOW ACCUMULATOR FAULT PERFORM TEST 7A
PRIMARY PRESSURE/DELTA PRESSURE FAULT PERFORM TEST 17A
BOOST PRESSURE FAULT PERFORM TEST 8A
RR WHEEL SPEED SENS CONTINUITY FAULT PERFORM TEST 9A
LR WHEEL SPEED SENS CONTINUITY FAULT PERFORM TEST 10A
RF WHEEL SPEED SENS CONTINUITY FAULT PERFORM TEST 11A
LF WHEEL SPEED SENS CONTINUITY FAULT PERFORM TEST 12A
RIGHT REAR WHEEL SPEED SENSOR FAULT PERFORM TEST 13A
LEFT REAR WHEEL SPEED SENSOR FAULT PERFORM TEST 14A
RIGHT FRONT WHEEL SPEED SENSOR FAULT PERFORM TEST 15A
LEFT FRONT WHEEL SPEED SENSOR FAULT PERFORM TEST 16A
ANTILOCK LAMP FAULT PERFORM TEST 18A
ANTILOCK LAMP RELAY FAULT PERFORM TEST 19A
EXCESS DECAY FAULT PERFORM TEST 20A