Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Cadillac XLRFACTORY OEM SERVICE PROCEDURE
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step tests for electromagnetic interference (EMI) on the signal circuit of the MAF sensor. A frequency reading with the MAF sensor disconnected may indicate an EMI related fault or a poor connection at the ECM. Disconnecting the MAF sensor may set additional related DTCs.
- 4: This step will determine if incorrect harness routing has caused this DTC to set.
- 5: This step will determine if water intrusion has caused this DTC to set.
- 6: This step will determine if a steady or intermittent high resistance at any point in the 12-volt reference circuit of the MAF sensor has caused this DTC to set.
DTC P0103
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
- | Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
0 Hz | Go to Step 4 | Go to Step 5 |
| 4 |
|
- | Go to Step 11 | Go to Step 8 |
| 5 |
|
- | Go to Step 11 | Go to Step 6 |
| 6 | Test the 12-volt reference circuit of the MAF sensor for the following conditions:
Refer to Inducing Intermittent Fault Conditions , Circuit Testing , Testing for Intermittent Conditions and Poor Connections ,Wiring Repairs , and Connector Repairs in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 7 |
| 7 | Test for an intermittent and for a poor connection at the MAF/IAT sensor. Refer to Testing for Intermittent Conditions and Poor Connections
, Repairing Connector Terminals
, and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 9 |
| 8 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections
,Repairing Connector Terminals
, and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 10 |
| 9 | Replace the MAF/IAT sensor. Refer to Mass Air Flow (MAF) Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 11 | - |
| 10 | Replace the ECM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 11 | - |
| 11 |
|
- | Go to Step 2 | Go to Step 12 |
| 12 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.