GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Matiz 🢒 Engine 🢒 Engine Controls - 0.8L 🢒 DTC P0562

Circuit Description

The engine control module (ECM) monitors the voltage supplied on the feedback circuit of the Engine Controls Ignition Relay or the Main 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 Main Relay, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0562 System Voltage Low

Conditions for Running the DTC
    • The ignition is ON.
    • DTC P0562 runs continously once the above conditions are met.

Conditions for Setting the DTC
    • The ECM detects the voltage on the feedback circuit of the Main Relay is less than 5 volts for 7.6 seconds.
    • The ECM detects Tthe ignition voltage is less than 11.5 volts.

Action Taken When the DTC Sets
    • 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
    • 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 Intermittent Conditions in Engine Controls 0.8L (LBF) or Intermittent Conditions in Engine Controls 1.0L (L11).
    • The following table illustrates the MAIN Relay terminal location in the underhood fuse block:

Main Relay Terminal Identification

Control

B+ - Coil

Feedback

B+ - Switch

Front of Vehicle

Test Description

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

Step

Action

Values

Yes

No

Schematic References: Engine Controls Schematics in Engine Controls - 0.8L (LBF) or Engine Controls Schematics in Engine Controls - 1.0L (L11)

Connector End View References: Engine Control Module Connector End Views or Engine Controls Connector End Views in Engine Controls - 0.8L (LBF) or Engine Control Module Connector End Views or Engine Controls Connector End Views in Engine Controls - 1.0L (L11).

1

Did you perform the Diagnostic System Check - Engine Electrical?

--

Go to Step 2

Go to Diagnostic System Check - Engine Electrical

2

Are DTCs P1610 or P1611 also set?

--

Go to Diagnostic System Check - Engine Controls in Engine Controls - 0.8L (LBF) or Diagnostic System Check - Engine Controls in Engine Controls - 1.0L (L11)

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 Volt

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 in Wiring Systems

5
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, command the Engine Controls Ignition Relay or the Main 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 Main Relay.
  3. Disconnect the appropriate ECM fuse in the underhood fuse block.
  4. Measure the resistance of the battery positive circuit of the Main Relay coil from the appropriate ECM 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.

    2. 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 Main 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 Main Relay.
  3. Probe the battery positive circuit of the Main 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 Test Lamp Kit 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 Main 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 Volts

Go to Step 10

Go to Step 17

10
  1. Connect a 15-ampere fused jumper wire from battery positive voltage to the Main Relay switched output terminal at the fuseblock for the feedback circuit of the Main 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 Volt

Go to Step 14

Go to Step 11

11
  1. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Connect a 15-ampere fused jumper wire from battery positive voltage to the Main Relay switched output terminal at the fuseblock for the feedback circuit of the Main Relay.
  4. Connect a test lamp from the feedback circuit of the Main Relay at the harness connector of the engine control module (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 Test Lamp Kit for this test. If the J 35616-200 is not available, use a test lamp that measures between 25-30 ohms.

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 Volts

Go to Step 15

Go to Step 18

13

Test the control circuit of the Main Relay for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 15

14

Test for an intermittent or poor connection at Main Relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

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 in Wiring Systems.

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 Main Relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 21

--

17

Repair the high resistance in the battery positive voltage circuit of the Main Relay switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 21

--

18

Repair the feedback circuit of the Main 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 in Wiring Systems.

Did you complete the repair?

--

Go to Step 21

--

19

Replace the Main Relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

--

Go to Step 21

--

20

Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls - 0.8L (LBF) or Engine Control Module Replacement in Engine Controls - 1.0L (L11).

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 System Check - Engine Controls in Engine Controls - 0.8L (LBF) or Diagnostic Trouble Code (DTC) List in Engine Controls - 1.0L (L11)

System OK