U0299-LOST COMMUNICATION WITH DC TO DC CONVERTER CONTROL MODULE "B"
For a complete wiring diagram, refer to the Wiring Information.
Possible Causes
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CAN BUS OPEN OR SHORTED CONDITION
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DC/DC CONVERTER 2
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POWERTRAIN CONTROL MODULE (PCM)
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
1.
DTC IS ACTIVE
| 1. |
Ignition on, engine not running.
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| 2. |
With the scan tool, Clear DTCs in the PCM.
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| 3. |
Monitor the scan tool for at least two minutes.
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| 4. |
Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
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| 6. |
Allow the engine to reach normal operating temperature.
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| 7. |
With the scan tool, select View DTCs.
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Is the status Active for this DTC?
Yes
No
2.
OTHER LIN BUS COMMUNICATION DTCs
| 1. |
Ignition on, engine not running.
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| 2. |
With the scan tool, select View DTCs.
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Are there any Communication DTCs logged for the Generator or Intelligent Battery Sensor?
Yes
No
3.
CHECK THE (D509) LIN BUS CIRCUIT FOR A SHORT TO GROUND
| 1. |
Turn the ignition off.
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| 2. |
Disconnect the IBS harness connector.
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| 3. |
Disconnect the PCM C1 harness connector.
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| 4. |
Disconnect the Generator C2 harness connector.
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| 5. |
Disconnect the DC to DC Converter C1 harness connector.
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| 6. |
Disconnect the DC to DC Converter C2 harness connector.
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| 7. |
Measure the resistance between ground and the (D509) LIN BUS circuit at the IBS harness connector.
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Is the resistance above 10k Ohms?
Yes
No
4.
CHECK THE (D509) LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE
| 1. |
Measure the resistance of the (D509) LIN BUS circuit between the DC/DC Converter 2 harness connector and the PCM C1 harness connector.
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Is the resistance below 5.0 Ohms?
Yes
No
5.
DC/DC CONVERTER
| 1. |
Turn the ignition off.
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| 2. |
Replace DC/DC Converter 2 in accordance with the service information.
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| 3. |
Reconnect all of the disconnected harness connectors.
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| 5. |
With the scan tool, erase DTCs in the PCM.
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| 6. |
Cycle the ignition on and off several times, leaving the ignition on for at least 20 seconds during each ignition cycle.
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| 8. |
With the scan tool, select View DTCs.
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Did the DTC return?
Yes
No
6.
POWERTRAIN CONTROL MODULE
| 1. |
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the DC/DC Converter and the Powertrain Control Module.
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| 2. |
Look for any chafed, pierced, pinched, or partially broken wires.
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| 3. |
Look for broken, bent, pushed out or corroded terminals.
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| 4. |
Perform any Technical Service Bulletins that may apply.
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Were any problems found?
Yes
No
7.
DC/DC CONVERTER
| 1. |
Turn the ignition off.
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| 2. |
Replace the DC/DC Converter in accordance with the service information.
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| 3. |
Reconnect all of the disconnected harness connectors.
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| 5. |
With the scan tool, erase DTCs in the PCM.
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| 6. |
Cycle the ignition on and off several times, leaving the ignition on for at least 20 seconds during each ignition cycle.
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| 8. |
With the scan tool, select View DTCs.
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Did the DTC return?
Yes
No
8.
POWERTRAIN CONTROL MODULE
| 1. |
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the DC/DC Converter and the Powertrain Control Module.
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| 2. |
Look for any chafed, pierced, pinched, or partially broken wires.
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| 3. |
Look for broken, bent, pushed out or corroded terminals.
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| 4. |
Perform any Technical Service Bulletins that may apply.
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Were any problems found?
Yes
No
