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Diagnostic Lamp Fault – Open Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 198 PID: FMI: LAMP: SRT: |
Diagnostic Lamp Fault – Open Circuit. The diagnostic lamp is open. |
Centinel™ system status or fault indications will not |
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Diagnostic Lamp Assembly |
 |
Circuit Description
The Centinel™ control module constantly monitors the operational parameters of the system. The status of the system is displayed by means of diagnostic lamps. There are two Centinel™ diagnostic lamps. They are green and red in color. The green lamp illuminates to indicate that the system’s operational parameters are within specified tolerances for heavy-duty only. For high-horsepower, the green light indicates the system has power. The red lamp illuminates to indicate that a system parameter is out of specified tolerances.
Component Location
Heavy-duty engines: The diagnostic lamps are located on the Centinel™
control module, located on the make up oil tank.
High-horsepower engines: The diagnostic lamps are located on the diagnostic lamp assembly on the oil make-up tank.
Shop Talk
There is no repair procedure for the heavy-duty. The module must be replaced. The following procedure pertains to high-horsepower only. Be certain the voltage of the high-horsepower diagnostic lamp assembly matches the application.
Cautions and Warnings
 CAUTION To avoid pin and harness damage, use the following test lead when taking measurements: |
|
CAUTION To avoid damaging a new Centinel™ control module, all other active fault codes must be investigated prior to replacing the Centinel™ control module. |
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CAUTION To avoid pin and harness damage, use the following test leads when taking measurements: |
|
CAUTION To avoid pin and harness damage, use the following test lead when taking a measurement: |
Troubleshooting Steps
| STEPS | SPECIFICATIONS | |
|---|---|---|
| STEP 1. | Check the diagnostic lamps. | |
| STEP 1A. Inspect the diagnostic lamps and Centinel™ harness connectors (high-horsepower only.) |
No damaged pins | |
| STEP 1B. Check the diagnostic lamps for an open. | Less than 2M ohms | |
| STEP 1C. Check the diagnostic lamps for a short. | More than 10 ohms | |
| STEP 2. | Check the Centinel™ harness. | |
| STEP 2A. Inspect the Centinel™ harness and the Centinel™ control module connectors. | No damaged pins | |
| STEP 2B. Check for an open circuit. | Less than 10 ohms | |
| STEP 2C. Check for a short circuit to ground. | More than 1k ohms | |
| STEP 2D. Check for a short circuit from pin to pin. | More than 1k ohms | |
| STEP 3. | Clear the fault codes. | |
| STEP 3A. Connect all the components. | Fault Codes 198 inactive | |
Guided Step 1 – Check the diagnostic lamps.
| Guided Step 1A – Inspect the diagnostic lamps and Centinel™ harness connectors (high-horsepower only.) |
|
|---|---|
Conditions
Action
For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361. |
|
| OK | NOT OK |
|
No damaged pins |
Repair the damaged pins |
| Guided Step 1B – Check the diagnostic lamp assembly for an open. | |
|---|---|
Conditions
Action
Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360. |
|
| OK | NOT OK |
|
Less than 2M ohms |
Replace the diagnostic lamp assembly Refer to Procedure 208-001. |
| Guided Step 1C – Check the diagnostic lamp assembly for a short. | |
|---|---|
Conditions
Action
Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360. |
|
| OK | NOT OK |
|
More than 10 ohms |
Replace the diagnostic lamp assembly Refer to Procedure 208-001. |
Guided Step 2 – Check the high-horsepower Centinel™ harness.
|
CAUTION To avoid damaging a new Centinel™ control module, all other active fault codes must be investigated prior to replacing the Centinel™ control module. |
| Guided Step 2A – Inspect the Centinel™ harness and Centinel™ control module connectors. |
|
|---|---|
Conditions
Action
For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361. |
|
| OK | NOT OK |
|
No damaged pins |
Repair the damaged pins |
|
CAUTION To avoid pin and harness damage, use the following test leads when taking measurements: |
| Guided Step 2B – Check for an open circuit. | |
|---|---|
Conditions
Action
Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360. |
|
| OK | NOT OK |
|
Less than 10 ohms |
Replace the Centinel™ wiring harness Refer to Procedure 019-131. |
|
CAUTION To avoid pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 2C – Check for a short circuit to ground. | |
|---|---|
Conditions
Action
Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360. |
|
| OK | NOT OK |
|
More than 1k ohms |
Replace the Centinel™ wiring harness or Centinel™ |
|
CAUTION To avoid pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 2D – Check for a short circuit from pin to pin. | |
|---|---|
Conditions
Action
Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360. |
|
| OK | NOT OK |
|
More than 1k ohms |
Replace the Centinel™ wiring harness or Centinel™ |
Guided Step 3 – Clear the fault codes.
| Guided Step 3A – Disable the fault code. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
Fault Code 198 inactive |
Replace the Centinel™ control module Replace the Centinel™ control module if the fault codes are active.
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