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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0615 >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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. Press 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.
  3. 4:  This step verifies that the ECM 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: Engine Controls Schematics for the 3.9L (LZ9) engine or Starting and Charging Schematics 
Connector End View Reference: Power and Grounding 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
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 START positions.
Does the crank relay click with each command?		 Go to Step 3  Go to Starter Solenoid Does Not Click 
3 
  1. Turn OFF the ignition.
  2. Remove the crank relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the crank relay coil supply voltage circuit of the crank relay 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 crank relay control circuit and the crank relay coil supply voltage circuit of the starter relay.
  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 .
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 .
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
7 Inspect for poor connections at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
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 .
Did you complete the repair?		 Go to Step 11  -
9 Replace the crank relay.
Did you complete the replacement?		 Go to Step 11  -
10 Replace the ECM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 11  -
11
  1. Review and record the scan tool Failure Records data.
  2. Clear the DTCs.
  3. Operate the vehicle within the 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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