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Test Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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 crank relay operates. Turn the ignition switch back and forth from the ON to START positions. Repeat this as necessary.
  2. 3:  This step tests for voltage at the coil side of the crank relay. The PCM IGN fuse supplies power to the coil side of the crank relay.
  3. 4:  This step verifies that the PCM is providing ground to the crank relay.
  4. 5:  This step tests if ground is constantly being applied to the crank relay.
DTC P0615

Step Action Yes No
Schematic Reference: Starting and Charging Schematics 
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views in Engine Controls - 3.8L (L26) or Power and Grounding Connector End Views in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the ignition back and forth from the ON to START positions.
Does the crank 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 crank relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage of the crank relay coil circuit with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 8 
4 
  1. Connect a test lamp between the control circuit of the crank relay and the battery positive voltage of the crank relay coil circuit.
  2. Turn the ignition back and forth from the ON to START 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 crank 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 crank 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 (PCM). 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 crank relay. Refer to Connector Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 11  -
9 Replace the crank relay.
Did you complete the replacement?		 Go to Step 11  -
10
IMPORTANT: The replacement PCM must be programmed.
Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.Did you complete the replacement?		 Go to Step 11  -
11
  1. Review and record scan tool Failure Records data.
  2. Clear the DTCs.
  3. Operate vehicle within Failure 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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