Circuit Description
The engine control module (ECM) supplies 12 volts to the control circuit of the START relay when start enable has been requested. The ECM monitors this circuit for conditions that are incorrect for the commanded state. If the ECM detects an improper circuit condition, START relay DTC P0615 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0615 Starter Relay Control Circuit
Conditions for Running the DTC
System voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | The ECM detects an improper voltage level on the control circuit that controls the START relay. |
| • | The condition exists for at least 2 seconds. |
Action Taken When the DTC Sets
| • | The ECM will not illuminate the malfunction indicator lamp (MIL). |
| • | The ECM will store the conditions present when the DTC set as Failure Records data only. |
Conditions for Clearing the MIL/DTC
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
Diagnostic Aids
Ignition system DTCs set with the ignition switch in the START position if the START relay or the starter is inoperative. When the ECM enables starter operation, the ECM also initiates the diagnostic test routines for other DTCs. If a condition exists which prevents the engine from cranking, the ECM will not receive signal input from the crankshaft position (CKP) and camshaft position (CMP) sensors, and the DTCs will set.
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may assist in diagnosing the condition. The information may help determine how often the condition that set the DTC occurs.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Listen for an audible click when the START relay operates. Turn the ignition switch back and forth from the ON to START positions. Repeat this as necessary.
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This step tests the ground circuit of the START relay.
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This step verifies that the ECM is providing 12 volts to the control circuit of START relay.
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This step tests for an open in the control circuit to the START relay.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Power and Grounding Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the START relay click with each command? | Go to Step 3 | ||
Does the test lamp illuminate? | Go to Step 4 | Go to Step 8 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 6 | Go to Step 5 | |
Test the control circuit of the START relay for an open or a high resistance. 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 START 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 ground circuit of the START relay. Refer to Connector Repairs . Did you complete the repair? | Go to Step 11 | -- |
9 | Replace the START 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 |
Does the scan tool indicate DTC P0615 failed this ignition? | Go to Step 2 | System OK |
