Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P1610: Engine Controls Ignition Relay Control Circuit High VoltageDTC P1611: Engine Controls Ignition Relay Control Circuit Low Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage - Coil | P0562, P1611 | P0562, P1611 | -- | -- |
B+ Voltage - Switch | P0562, P1611 | P0562, P1611 | -- | -- |
EC Ignition Relay Control | P0563, P1611 | P0562, P1611 | P0562, P1610 | -- |
EC Ignition Relay Feedback | P0562, P1611 | P0562, P1611 | -- | -- |
Circuit/System Description
The engine controls (EC) ignition relay or ENGINE relay, is controlled by the engine control module (ECM) depending upon input from the ignition switch. Battery positive voltage is supplied to the relay coil and switch. When the ignition switch is turned to the ON position, the ECM will provide ground on the control circuit of the relay using a low side driver. This will allow voltage through the relay switch contacts to the components. The ECM monitors the voltage level on the control circuit of the relay.
Conditions for Running the DTC
| • | The ignition is ON or the engine is operating. |
| • | The DTCs run continuously once the above condition is met. |
Conditions for Setting the DTC
P1610
The ECM detects a short to voltage on the control circuit of the relay.
P1611
The ECM detects an open or short to ground on the control circuit of the relay.
Action Taken When the DTC Sets
DTC P1610 and P1611 are Type A DTCs.
Conditions for Clearing the DTC
DTC P1610 and P1611 are Type A DTCs.
Diagnostic Aids
The following table illustrates the ENGINE relay terminal location in the underhood fuse block:
ENGINE Relay Terminal Identification | |
|---|---|
Feedback | B+ - Coil |
Control | B+ - Switch |
Front of Vehicle | |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, command the EC ignition relay ON with a scan tool. You should hear an audible click for about 3-5 seconds.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ignition OFF, disconnect the EC ignition relay.
- Ignition ON, command the fuel pump relay ON with a scan tool. Test for battery voltage between the relay switch ignition 1 voltage circuit terminal 86 and ground.
- Test for less than 0.1 volts between the relay coil B+ voltage circuit terminal 30 and 12 volts.
- Ignition OFF, connect a test lamp between the relay switch control circuit terminal 85 and the relay switch ignition 1 voltage circuit terminal 86.
- Ignition ON, command the EC ignition relay ON with a scan tool. The test lamp should turn ON for about 3-5 seconds and then turn OFF.
- Connect a 15A fused jumper wire between the relay coil B+ supply voltage circuit terminal 30 and the relay switch ignition 1 voltage circuit terminal 86.
- Attempt to start the engine. The engine should start.
- If all circuits test normal, test or replace the EC ignition relay.
| ⇒ | If less than B+, repair the relay switch ignition 1 voltage circuit for a short to ground or an open/high resistance. |
| ⇒ | If greater than the specified range, repair the relay coil B+ voltage circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the ECM. |
Important: The ignition 1 voltage circuit is between the EC ignition relay and the ECM. The ignition 1 voltage is a feedback circuit.
| ⇒ | If the engine does not start, test the relay switch ignition 1 voltage circuit between the EC ignition relay and the ECM for a short to ground or for an open/high resistance. If the circuit tests normal, replace the ECM. |
Component Testing
- Ignition OFF, disconnect the EC ignition relay.
- Test for 70-110 ohms between terminals 85 and 86.
- Test for infinite resistance between the following terminals:
- Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
| ⇒ | If not within the specified range, replace the EC ignition relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If not the specified value, replace the EC ignition relay. |
| ⇒ | If greater than the specified range, replace the EC ignition relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
