P1510

DTC P1510 Back-Up Power Supply:

Back-Up Power Supply:

CIRCUIT DESCRIPTION


Battery voltage is supplied for DTC memory, values for engine controls learned by the ECM, etc. are kept in the ECM's memory even when the Ignition is turned "OFF."


CONDITIONS FOR SETTING THE DTC


- No back-up power supply to the ECM.

- Engine running.

- The above conditions are met for 5 seconds or more.


ACTION TAKEN WHEN THE DTC SETS


- The Malfunction Indicator Lamp (MIL) will illuminate and the ECM will store DTC P1510 as long as the Ignition is not turned "OFF."


CONDITIONS FOR CLEARING THE MIL/DTC


- The MIL will turn "OFF" after three consecutive drive cycles without a fault present.

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

- DTC(s) can be cleared by using a scan tool or by disconnecting the ECM battery feed.

DIAGNOSTIC AIDS


Check for the following conditions:

ECM will indicate DTC P1510 as long as the Ignition is "ON," as soon as the Ignition is turned "OFF" the ECM will lose its memory and no DTC(s) will be stored.


- Poor connection or damaged harness. Inspect the wiring harness for damage.

- Check fuses for being blown, replace and retest.

If any wiring repairs need to be made, Refer to Repair Procedures in Diagrams.

TEST DESCRIPTION


Number(s) below refer to the step number(s) on the Diagnostic Table.


1. The Engine OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

2. Determine if a fault is present.

3. Checks for voltage at the ECM when the Ignition is "OFF". The ECM should indicate battery voltage on this terminal under all operating conditions.