P0616

DTC P0616

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC P0616 Starter Relay Control Circuit Low Voltage - CRNK Relay

Diagnostic Fault Information






Circuit/System Description
When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the transmission is in Park or Neutral. If it is, then the ECM then supplies 12 volts to the control circuit of the CRNK relay. When this occurs, battery voltage is supplied through the switch of the crank relay to the S terminal of the starter solenoid. The ECM always supplies some voltage to the control circuit of the CRNK relay, through a pull-up resistor. If the circuit becomes open or shorted, then the ECM will set DTCs.

Conditions for Running the DTC
^ The Ignition is in the START position.
^ The system voltage is between 9.5-18 volts.

Conditions for Setting the DTC
The ECM detects low voltage on the control circuit of the CRNK relay.

Action Taken When the DTC Sets
DTC P0616 is a C type DTC.

Conditions for Clearing the DTC
DTC P0616 is a C type DTC.

Circuit/System Verification
1. Ignition ON, verify that No immobilizer or automatic transmission DTCs are set that would cause the ECM not to enable engine starting.
2. Clear the DTCs from the ECM. Turn the ignition key to the start position. The engine should crank.
3. Verify that all three Starter Relay Ckt Short and Open Test Status scan tool parameters are OK or Not Run.
4. Verify that DTCs P0615, P0616, and P0617 are not set.

Circuit/System Testing
1. Ignition OFF, disconnect the CRNK relay.
2. Test for 60-90 ohms between terminals 85 and 86 of the CRNK relay.
^ If not within the specified range, replace the CRNK relay.

3. Probe the relay ground circuit, right rear terminal 86, with a test lamp that is connected to B+. Verify that the test lamp illuminates.
^ If the test lamp does not illuminate, then test the ground circuit for an open/high resistance.

4. Ignition OFF, connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.Turn the ignition to the start position. The test lamp should illuminate only when the ignition is held in the start position.
^ If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
^ If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, replace the relay.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information
^ [Relay Replacement (Within an Electrical Center)] [Relay Replacement (Attached to Wire Harness)]