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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - 2.6L & 3.2L - Diagnosis (DTC P0030 - P0174)) >> Diagnostic Trouble Codes >> DTC P0103 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  This step will determine if any mechanical faults have caused this DTC to set.
  2. 6:  A very small amount of voltage will appear on this circuit when the ECM is operational. This is considered normal.
  3. 7:  The measured resistance of the circuit will increase when the ECM is operational. This is considered normal.
DTC P0103

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2
IMPORTANT: If you were sent here from P0101 proceed to step 4.
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 60 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records that you observed.
Does the DTC fail this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Idle the engine.
  2. Observe the mass air flow (MAF) sensor voltage with a scan tool.
Is the MAF sensor voltage more than the specified value?		 4.8 V Go to Step 5  Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Inspect for the following conditions:
    • A dirty air filter element
    • A deteriorating air filter element
    • Any debris on the air diffuser of the MAF sensor
    • Any debris or contamination on the sensing element of the MAF sensor
    • Any water in the air induction system
Did you find and correct the condition?		 - Go to Step 17  Go to Step 5 
5
  1. Ensure the engine remains idling.
  2. Disconnect the MAF sensor harness connector. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement .
  3. Observe the MAF sensor voltage with a scan tool.
Is the voltage more than the specified value?		 0.00 V Go to Step 10  Go to Step 6 
6 
  1. Turn OFF the ignition.
  2. Turn ON the ignition, with the engine OFF.
  3. Probe the low reference circuit of the MAF sensor with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 12  Go to Step 7 
7 
IMPORTANT: Verify that the engine control module (ECM) has shut down prior to measuring the resistance of the low reference circuit of the MAF sensor. This can be verified by the loss of communication on the scan tool.
  1. Turn OFF the ignition for 60 seconds.
  2. Turn OFF all accessories and electrical components.
  3. Measure the resistance from the low reference circuit of the MAF sensor to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 5 ohm Go to Step 13  Go to Step 8 
8
  1. Disconnect the ECM harness connector.
  2. Test the low reference circuit of the MAF sensor for the following conditions:
    • A high resistance
    • An open circuit
  3. Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 9 
9 Measure the resistance from the ECM case to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 5 ohm Go to Step 14  Go to Step 11 
10
  1. Turn OFF the ignition.
    2. IMPORTANT: Disconnecting the ECM connectors may eliminate the short to voltage if the signal circuit is shorted to another ECM circuit.
  2. Disconnect the ECM
  3. Test the signal circuit of the MAF sensor for the following conditions:
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
11 Repair the high resistance or an open in the ground circuit of the ECM. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 17  -
12
IMPORTANT: A short to voltage on the low reference circuit of the MAF sensor may cause internal damage to the ECM. Verify proper system operation after completing the repair.
Repair the short to voltage in the low reference circuit of the MAF sensor. Refer to Wiring Repairs in Wiring Systems.Did you complete the repair?		 - Go to Step 17  -
13 Test for an intermittent and for a poor connection at the MAF sensor and repair as necessary. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
14 Test for an intermittent and for a poor connection at the ECM and repair as necessary. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
15 Replace the MAF/IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 17  -
17
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 60 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 18 
18 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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