Indicator Lamp - Test
Use this procedure under the following circumstances:
- The lamps are not receiving battery voltage.
- The lamps are not operating correctly.
- One of the following diagnostic codes is active:
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| Diagnostic Trouble Codes | ||
|---|---|---|
| J1939 Code | Code Description | Comments |
| 623-6 | Red Stop Lamp : Current Above Normal | The Electronic Control Module (ECM) detects a high current condition on the stop lamp circuit for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. No lamps will come on. |
| 624-6 | Amber Warning Lamp : Current Above Normal | The ECM detects a high current condition on the warning lamp circuit for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. No lamps will come on. |
| 1081-6 | Engine Wait to Start Lamp : Current Above Normal | The ECM detects a high current condition on the wait to start lamp circuit for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. The warning lamp will come on. |
| 1213-6 | Malfunction Indicator Lamp (MIL) : Current Above Normal | The ECM detects a high current condition on the circuit for the MIL lamp for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. The warning lamp will come on. |
| 5099-6 | Engine Oil Pressure Low Lamp Data : Current Above Normal | The ECM detects a high current condition on the low oil pressure lamp circuit for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. The warning lamp will come on. |
| 5245-6 | Aftertreatment Selective Catalytic Reduction Operator Inducement Active : Current Above Normal | The ECM detects a high current condition on the circuit for the Diesel Exhaust Fluid (DEF) level lamp for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. The warning lamp will come on. |
| 5841-6 | Diesel Exhaust Fluid Quality Malfunction : Current Above Normal | The ECM detects a high current condition on the DEF quality lamp circuit for at least 0.3 seconds.
The battery voltage is at least 10 V. The ECM is attempting to activate the lamp. The warning lamp will come on. |
| Follow the troubleshooting procedure in order to identify the root cause of the problem. | ||
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| Illustration 1 | g03726847 |
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Typical schematic of the circuit for the indicator lamps Not all connectors are shown. Refer to the Electrical Schematic for the application. | |
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| Illustration 2 | g03726859 |
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Pin locations on the P1 connector for the indicator lamps (48) DEF level lamp (50) Wait to start lamp (51) Shutdown lamp (69) Low oil pressure lamp (74) DEF quality lamp (92) Warning lamp (94) MIL lamp | |
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Inspect Electrical Connectors and Wiring A. Turn the keyswitch to the OFF position. B. Check the fuses. C. Thoroughly inspect the P1 connector and the lamp connections. Refer to Troubleshooting, "Electrical Connector - Inspect" for details. D. Perform a E. Check the harness for abrasions and for pinch points from the battery to the ECM. |
Damaged wire or connector |
Result: A damaged wire or damaged connector was not found. The fuses are OK. Proceed to Test Step 2. Result: A damaged wire or damaged connector was found. a fuse is blown. Repair: Repair the damaged wire or the damaged connector. Replace any blown fuses. Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault. |
2. Check for Recently Logged Diagnostic Codes A. Turn the keyswitch to the ON position. Note: Lamp Test - When the keyswitch is turned to the ON position, the ECM will activate the lamps for 2 seconds. B. Check that all of the indicator lamps come on during the 2 second lamp test. Wait at least 10 seconds for activation of the diagnostic codes. C. Access the "Active Diagnostic Code" screen on the electronic service tool and check for active diagnostic codes. |
Diagnostic Trouble Codes Lamp function |
Result: At least one of the lamps did not come on during the lamp test. Proceed to Test Step 3. Result: One of the diagnostic codes listed in Table 1 is active or recently logged. Proceed to Test Step 6. |
3. Check the Lamp A. Turn the keyswitch to the OFF position. B. Disconnect the suspect lamp. Inspect the lamp in order to determine if the lamp has failed. C. Use a multimeter in order to measure the resistance across the two terminals of the lamp. If the resistance is more than 2000 Ohms, the bulb has failed. |
Lamp |
Result: The lamp is OK. Proceed to Test Step 4. Result: The lamp has failed. Repair: Install a replacement lamp. Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test. |
4. Measure the Input to the Lamp at the Lamp Socket A. Turn the keyswitch to the ON position. B. Measure the voltage between the lamp socket and a suitable ground. C. Turn the keyswitch to the OFF position. |
10 V to 14 V |
Result: The measured voltage is within the expected range. Proceed to Test Step 5. Result: The measured voltage is not within the expected range. The fault is in the wiring between the suspect lamp input and the main relay. Repair: Replace the faulty wiring. Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test. |
5. Check the Wiring Between the Lamp Connector and the ECM A. Turn the keyswitch to the OFF position. B. Disconnect the suspect lamp. Disconnect the P1 connector. C. Use a suitable multimeter to measure the resistance between the suspect lamp connector output and the appropriate terminal on the P1 connector. Refer to Illustration 1. |
Less than 5 Ohms |
Result: The measured resistance is greater than 5 Ohms. The fault is in the wiring between the suspect lamp and the P1 ECM connector. Repair: Replace the faulty wiring. Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test. Result: The measured resistance is less than 5 Ohms. Contact the Dealer Solution Network (DSN). |
6. Inspect the Lamp Connector A. Turn the keyswitch to the OFF position. B. Thoroughly inspect the connector for the suspect lamp. Ensure that the connector is free from corrosion and/or damage. |
Lamp connector |
Result: The lamp connector is free from corrosion and/or damage. Proceed to Test Step 7. Result: The lamp connector is showing signs of corrosion and/or damage. There may be a short in the lamp connector. Repair: Ensure that the connector is free from corrosion. If necessary, replace the connector. Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test. |
8. Check the Wiring Between the Lamp Connector and the ECM for a Short Circuit A. Turn the keyswitch to the OFF position. B. Disconnect the suspect lamp. Disconnect the P1connector from the ECM. C. Use a suitable multimeter to measure the resistance between the terminal for the suspect lamp on the P1 connector and all other terminals on the P1 connector. |
Greater than 1 k Ohm |
Result: At least one of the resistance measurements is less than 1 k Ohm. There is a short in the wiring between the suspect lamp and the P1 ECM connector. Repair: Replace the faulty wiring. Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test. Result: All resistance measurements are greater than 1 k Ohm. Contact the Dealer Solution Network (DSN). |
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