Test 1A - Checking System For Fault Messages
- Using DRB, read fault messages and perform appropriate test listed in FAULT MESSAGES table. If DRB displays MAIN RELAY/POWER CIRCUIT FAILURE, go to TEST 14A before proceeding with other tests. If DRB displays CONTROLLER FAILURE, replace CAB. Perform TEST VER-1A. If DRB displays NO RESPONSE message, go to TEST 34A. If DRB screen is blank or no fault messages are displayed, see DRB PROBLEMS & ERROR MESSAGES under DIAGNOSIS & TESTING. Also check SYSTEM MALFUNCTION table for problems described by customers, with no fault messages present, and perform appropriate test.
- In some cases, cause of one fault message may set additional fault messages. If multiple fault messages appear on DRB, fault repairs must be performed in order they appear in FAULT MESSAGES table. If only one fault is set, perform indicated test for that fault message.
FAULT MESSAGES
| Fault Message | Perform Test | ||
|---|---|---|---|
| ABS AMBER WARNING LAMP CIRCUIT FAILURE | 2A | ||
| DIAGNOSTIC COMPARE | (1) | ||
| FLUID LEVEL SWITCH OPEN | 3A | ||
| FLUID LEVEL SWITCH NOT PROCESSABLE | 4A | ||
| HYDRAULIC FAILURE | 5A | ||
| LF INLET VALVE | 6A | ||
| LF OUTLET VALVE | 7A | ||
| LF SENSOR CIRCUIT FAILURE | 8A | ||
| LF SENSOR CONTINUITY K 25 MPH | 8A | ||
| LF SENSOR CONTINUITY J 25 MPH | 8A | ||
| LF SENSOR SIGNAL MISSING | 8A | ||
| LF SENSOR SPEED COMPARISON | 8A | ||
| LR INLET VALVE | 10A | ||
| LR OUTLET VALVE | 11A | ||
| LR SENSOR CIRCUIT FAILURE | 12A | ||
| LR SENSOR CONTINUITY K 25 MPH | 12A | ||
| LR SENSOR CONTINUITY J 25 MPH | 12A | ||
| LR SENSOR SIGNAL MISSING | 12A | ||
| LR SENSOR SPEED COMPARISON | 12A | ||
| MAIN RELAY/POWER CIRCUIT FAILURE | 14A | ||
| PEDAL TRAVEL SENSOR CIRCUIT | 15A | ||
| BRAKE SWITCH CIRCUIT | 16A | ||
| PUMP MOTOR CIRCUIT NOT WORKING PROPERLY | 17A | ||
| PUMP MOTOR RUNNING WITHOUT COMMAND | 18A | ||
| RF INLET VALVE | 19A | ||
| RF OUTLET VALVE | 20A | ||
| RF SENSOR CIRCUIT FAILURE | 21A | ||
| RF SENSOR CONTINUITY K 25 MPH | 21A | ||
| RF SENSOR CONTINUITY J 25 MPH | 21A | ||
| RF SENSOR SIGNAL MISSING | 21A | ||
| RF SENSOR SPEED COMPARISON | 21A | ||
| RR INLET VALVE | 23A | ||
| RR OUTLET VALVE | 24A | ||
| RR SENSOR CIRCUIT FAILURE | 25A | ||
| RR SENSOR CONTINUITY K 25 MPH | 25A | ||
| RR SENSOR CONTINUITY J 25 MPH | 25A | ||
| RR SENSOR SIGNAL MISSING | 25A | ||
| RR SENSOR SPEED COMPARISON | 25A | ||
| TRACTION CONTROL VALVE #1 | 27A | ||
| TRACTION CONTROL VALVE #2 | 28A | ||
|
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SYSTEM MALFUNCTION
| Problem | Perform Test |
|---|---|
| Inoperative LTCS | 29A |
| Inoperative LTCS Active Light (Green) | 30A |
| Inoperative LTCS Warning Light (Amber) | 31A |
| Brake Warning Light (Red) Stays Illuminated | 32A |
| ABS Warning Light (Amber) Does Not Illuminate At Start-Up | 33A |