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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 619 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0615: Starter Relay Control Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  Listen for an audible click when the STARTER relay operates. Press the ignition switch back and forth from the ON to Crank positions. Repeat this as necessary.
  2. 3:  Tests for voltage at the coil side of the STARTER relay. The ECM IGN fuse supplies power to the coil side of the Crank relay.
  3. 4:  Verifies that the ECM is providing ground to the STARTER relay.
  4. 5:  Tests if ground is constantly being applied to the STARTER relay.
DTC P0615

Step Action Yes No
Schematic Reference: Starting and Charging Schematics 
Connector End View Reference: Engine Control Module (ECM) Connector End Views in Engine Controls - 2.6L and 3.2L, Engine Control Module (ECM) Connector End Views in Engine Controls - 3.6L (LY7), or Powertrain Control Module (PCM) Connector End Views in Engine Controls - 5.7L
1 Did you perform the Vehicle Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Engine Electrical 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Press the ignition back and forth from the ON to Crank positions.
Does the STARTER relay click with each command?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the STARTER relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the battery positive voltage of the STARTER relay coil circuit and a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 8 
4 
  1. Connect a test lamp between the battery positive voltage of the STARTER relay coil circuit and the control circuit of the STARTER relay.
  2. Turn the ignition back and forth from the ON to Crank positions.
Does the test lamp turn ON and OFF with each command?		 Go to Step 6  Go to Step 5 
5  Test the control circuit of the STARTER relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
6 Inspect for poor connections at the STARTER relay. 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 11  Go to Step 9 
7 Inspect for poor connections at the powertrain control module (ECM). 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 11  Go to Step 10 
8 Repair the battery positive voltage circuit of the STARTER relay. Refer to Connector Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 11  -
9 Replace the STARTER relay.
Did you complete the replacement.		 Go to Step 11  -
10
IMPORTANT: The replacement PCM must be programmed.
Replace the PCM. Refer to Engine Control Module (ECM) Replacement in Engine Controls - 2.6L and 3.2L, Engine Control Module (ECM) Replacement in Engine Controls - 3.6L (LY7), or Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.Did you complete the replacement?		 Go to Step 11  -
11
  1. Review and record scan tool Fail Records data.
  2. Clear DTCs.
  3. Operate vehicle within Fail Records conditions as noted.
  4. Using a scan tool, monitor the Specific DTC Information for DTC P0615.
Does the scan tool indicate DTC P0615 failed this ignition?		 Go to Step 2  System OK
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