DIAGNOSTIC TROUBLE CODE (DTC) - P0562 SYSTEM VOLTAGE (ENGINE SIDE) TOO LOW

   Know your Circuit

  • The ignition voltage on the ignition feed circuit to terminal 7 at the ECM is controlled by the engine control module (ECM).
  • If there is a voltage fluctuation and the voltage dips  below the calibrated level ,a system voltage Diagnostic Trouble Code (DTC) will automatically set

Pre-requisites for setting the DTC

The following conditions must prevail:

·   Ignition has to be ON.

·   Main relay is ON.

·   The ignition voltage is < 11.5 volt.

·   The main relay voltage is < 5.0V or > 26V for 7.6 seconds.

What happens when DTC sets?

When will DTC clear?

1) The Malfunction Indicator Lamp (MIL) will cease to glow.

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

 

2) The ECM will record and store conditions present when the DTC was set as Failure Records data only

2) DTC(s) can be cleared by means of the scan tool.

 

  3) This information will not be stored in the Freeze Frame data.

-

 

Diagnostic Tools

An Intermittent problem may be caused by the following:

  1. A poor connection
  2. Rubbed through wire insulation
  3. Wire that is tampered inside the insulation.

Any circuitry suspected to cause the problem should be thoroughly checked for the following conditions.

·   Backed-out terminals

·   Improper mating

·   Broken locks

·   Improperly formed or tampered terminals

·   Poor terminals to wire connection

·   Physical damage to the wiring harness

                                 SUMMARY OF STEPS TO BE FOLLOWED

DTC P0562 - System Voltage (Engine Side) Too Low

Step

Process

R    E    S

U    L    T

1

 

Carry out an EOBD System Check.

Work Done?

IF YES

THEN

 

 

Follow Step 2

IF NO

 THEN

 Go to "On-Board Diagnostic System Check"

2

  1. Clear the DTCs by installing a scan tool.
  2. Start the engine and increase the engine speed bringing it to the value stated.
  3. Install the electrical system by turning on the headlights, high blower motor, etc.

Note: the value at this point is between 1,400rpm 10V

Do you note that the ignition voltage is below the specified value?

IF YES

 THEN

Follow Step 3

IF NO

 THEN

Follow Step 8

3

  1. Let the engine run at the specified value.
  2. Now with the help of a digital voltmeter (DVM), measure and note the battery voltage at the battery.

Note: the value at this point is between 1,400rpm 12V

 

Do you observe that the battery voltage is more than the value mentioned?

IF YES

 THEN

Follow Step 4

IF NO

THEN

Go to "Diagnostic Tools"

4

  1. Turn the ignition switch to LOCK mode.
  2. Dissociate the engine control module (ECM) connector found at the ECM.
  3. Turn the ignition switch to ON keeping the engine OFF.
  4. Note the ignition voltage at the ignition feed circuit terminal 29 with the help of a DVM.

Note: the value at this point is 10V

 

Do you find that the ignition voltage is greater than the specified value?

IF YES

 THEN

Follow Step 5

IF NO

 THEN

Follow Step 6

5

Examine if there is any erroneous connection at the ECM harness terminals and mend as needed.

 

IF YES

 THEN

Follow Step 8

IF NO

 THEN

Follow Step 7

6

Mend the poor connection (high resistance) existing in the ignition feed circuit.

Work Done?

Follow Step 8

-

7

Change the ECM.

Task complete?

IF YES

 THEN

Follow Step 8

-

8

  1. Clear the DTCs with the help of a Scan Tool.
  2. Start the vehicle and idle at normal operating temperature.
  3. Run the vehicle within the conditions necessary for setting this DTC as given in the supporting text.

Does the scan tool indicate that this diagnostic has been run and passed?

IF YES

 THEN

 

 

 

 

Follow Step 9

IF NO

 THEN

 

 

 

 

Follow Step 2

9

Note whether any additional DTCs are set.

Are there any undiagnosed DTCs displayed?

IF YES

 THEN

Go to applicable DTC table

Your car’s system is Fine.