For 1990-2009 cars

## DTC P0562 w/Delphi Controller

### Circuit Description

The engine control module (ECM) uses the ignition 1 voltage circuit to monitor system voltage. Voltage that is out of range will cause damage to components and incorrect input readings. If the ECM detects an excessively low system voltage, DTC P0562 will set.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0562 System Voltage Low

### Conditions for Running the DTC

• | The ignition is ON, with the engine OFF.

• | DTC P0562 runs continuously once the above condition is met.

### Conditions for Setting the DTC

The ECM detects a system voltage below 11 volts for more than 5 minutes.

### Action Taken When the DTC Sets

• | The control module stores the DTC information into memory when the diagnostic runs and fails.

• | The malfunction indicator lamp (MIL) will not illuminate.

• | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.

• | The driver information center, if equipped, may display a message.

### Conditions for Clearing the DTC

• | A current DTC Last Test Failed clears when the diagnostic runs and passes.

• | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

• | Clear the DTC with a scan tool.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic References: Starting and Charging Schematics Connector End View References: Component Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Start the engine.
2. Raise the engine speed above 1,500 RPM.
3. With a scan tool, observe the Ignition 1 voltage parameter in the engine control module (ECM) data list.

Is the voltage more than the specified value?

10.5 V

Go to Step 3

Go to Step 4

3 |

1. Observe the Freeze Frame/Failure Records data for this DTC.
2. Turn OFF the ignition for 30 seconds.
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 4

Go to Testing for Intermittent Conditions and Poor Connections

4 |

1. Measure the voltage at the battery with a DMM.
2. Raise the engine speed above 1,500 RPM.
3. Compare the voltage at the battery to the Ignition 1 voltage parameter in the ECM data list.

Is the battery voltage and Ignition 1 parameter readings different by more than the specified value?

0.5 V

Go to Step 5

Go to Charging System Test

5 | Test the ignition 1 voltage circuit of the ECM for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6
6 | Test for an intermittent or poor connection at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7
7 | Replace the ECM. Refer to Control Module References. Did you complete the replacement? | -- | Go to Step 8 | --
8 |

1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 2

Go to Step 9

9 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK

## DTC P0562 w/o Delphi Controller

### Circuit Description

The engine control module (ECM) monitors the voltage supplied on the feedback circuit of the engine controls ignition relay or ENGINE relay. Voltage that is out of range will cause incorrect input readings from the engine components connected to the relay. If the ECM detects low voltage on the feedback circuit of the ENGINE relay, this DTC sets.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0562 Engine Controls Ignition Relay Feedback Circuit

### Conditions for Running the DTC

• | The ignition is ON.

• | DTC P0562 runs continuously once the above conditions are met.

### Conditions for Setting the DTC

#### European Emissions

The ECM detects voltage on the feedback circuit of the ENGINE relay is less than 5 volts for 7.6 seconds.

### Conditions for Setting the DTC

#### Non European Emissions

The ECM detects voltage on the feedback circuit of the ENGINE relay is less than 8 volts.

### Action Taken When the DTC Sets - European Emissions Only

• | The malfunction indicator lamp (MIL) will not illuminate.

• | The ECM will store conditions which were present when the DTC was set as Failure Records data only.

• | This information will not be stored in the Freeze Frame data.

### Conditions for Clearing the MIL/DTC - European Emissions Only

• | A history DTC will clear after 40 consecutive warm-up cycles without a fault.

• | DTCs can be cleared by using the scan tool.

• | Disconnect the ECM battery feed for more than 10 seconds.

### Diagnostic Aids

• | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .

• | The following table illustrates the ENGINE relay terminal location in the underhood fuse block:

ENGINE Relay Terminal Identification
Feedback | B+ - Coil
Control | B+ - Switch

### Test Description

The number below refers to the step number on the diagnostic table.

1. Listen for an audible click when the relay operates. Repeat the commands as necessary.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic References: Starting and Charging Schematics Connector End View References: Component Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Are DTCs P1610 or P1611 also set? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 3
3 |

1. Start the engine.
2. Measure the voltage at the battery with a DMM.
3. Observe the Ignition 1 Signal parameter with a scan tool.
4. Subtract the battery voltage from the voltage indicated on the Ignition 1 Signal parameter.

Is the voltage difference less than the specified value?

1 V

Go to Step 4

Go to Step 5

4 |

1. Observe the Freeze Frame/Failure Records data for this DTC.
2. Turn OFF the ignition for 30 seconds.
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 5

Go to Testing for Intermittent Conditions and Poor Connections

5 |

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, command the engine controls ignition relay or ENGINE relay ON.

Do you hear an audible click when the relay is commanded ON?

--

Go to Step 8

Go to Step 6

6 |

1. Turn OFF the ignition.
2. Disconnect the ENGINE relay.
3. Disconnect the ENG MAIN fuse in the underhood fuse block.
4. Measure the resistance of the battery positive circuit of the ENGINE relay coil from the ENG MAIN fuse terminal to the relay terminal.

Is the resistance less than the specified value?

3 ohms

Go to Step 7

Go to Step 16

7 |

1. Turn ON the ignition, with the engine OFF.

Important: Use the J 35616-200 Test Lamp Kit for this test. If the J 35616-200 is not available, use a test lamp that measures between 25-30 ohms.

2. Probe the control circuit of the ENGINE relay with a test lamp connected to battery positive voltage.
3. Measure the voltage from the probe of the test lamp to a good ground with a DMM.

Is the voltage less than the specified value?

2.5 V

Go to Step 14

Go to Step 13

8 |

1. Turn OFF the ignition.
2. Disconnect the ENGINE relay.
3. Probe the battery positive circuit of the ENGINE relay switch with a test lamp connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 17

9 |

Important: Use the J 35616-200 for this test. If the J 35616-200 is not available, use a test lamp that measures between 25-30 ohms.

1. Probe the battery positive circuit of the ENGINE relay switch with a test lamp connected to a good ground.
2. Measure the voltage from the probe of the test lamp to battery positive voltage with a DMM.

Is the voltage less than the specified value?

0.1 V

Go to Step 10

Go to Step 17

10 |

1. Connect a 15-amp fused jumper wire from battery positive voltage to the ENGINE relay switched output terminal at the fuseblock for the feedback circuit of the ENGINE relay.
2. Turn ON the ignition, with the engine OFF.
3. Measure the voltage at the battery with a DMM.
4. Observe the Ignition 1 Signal parameter with a scan tool.
5. Subtract the battery voltage from the voltage indicated on the Ignition 1 Signal parameter.

Is the voltage difference less than the specified value?

1 V

Go to Step 14

Go to Step 11

11 |

1. Turn OFF the ignition.
2. Disconnect the ECM.
3. Connect a 15-amp fused jumper wire from battery positive voltage to the ENGINE relay switched output terminal at the fuseblock for the feedback circuit of the ENGINE relay.
4. Connect a test lamp from the feedback circuit of the ENGINE relay at the harness connector of the ECM to a good ground.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 18

12 |

Important: Use the J 35616-200 for this test. If the J 35616-200 is not available, use a test lamp that measures between 25-30 ohms.

1. Connect a test lamp from the feedback circuit of the ENGINE relay at the harness connector of the ECM to a good ground.
2. Measure the voltage from the probe of the test lamp to battery positive voltage with a DMM.

Is the voltage less than the specified value?

0.3 V

Go to Step 15

Go to Step 18

13 | Test the control circuit of the ENGINE relay for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 15
14 | Test for an intermittent or poor connection at ENGINE relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 19
15 | Test for an intermittent or poor connection at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 20
16 | Repair the high resistance in the battery positive voltage circuit of the ENGINE relay coil. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 21 | --
17 | Repair the high resistance in the battery positive voltage circuit of the ENGINE relay switch. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 21 | --
18 | Repair the feedback circuit of the ENGINE relay for one of the following conditions.

• | An open

• | High resistance

| Important: If a short to ground is indicated by an open ENG MAIN fuse. Test all circuits protected by the fuse.

• | A short to ground

Refer to Wiring Repairs .

Did you complete the repair?

--

Go to Step 21

--

19 | Replace the ENGINE relay. Did you complete the replacement? | -- | Go to Step 21 | --
20 | Replace the ECM. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 21 | --
21 |

1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 2

Go to Step 22

22 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK