2012 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P0562-BATTERY VOLTAGE LOW

P0562-BATTERY VOLTAGE LOW

For a complete wiring diagram, refer to the Wiring Information.



POSSIBLE CAUSES

BATTERY POSITIVE CIRCUIT HIGH RESISTANCE
GENERATOR CASE GROUND HIGH RESISTANCE
(A908) FUSED B+ CIRCUIT HIGH RESISTANCE
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. DTC IS ACTIVE



NOTE: Diagnose and repair any charging system DTCs before proceeding with this test.

NOTE: Inspect and test the battery in accordance with the Service Information before continuing with this test.

NOTE: Inspect the generator drive belt before continuing with this test.

NOTE: Inspect the vehicle for aftermarket accessories that may exceed the Generator System output.

NOTE: Inspect the fuses in the IPM. If an open fuse is found, use the wire diagram/schematic as a guide and inspect the wiring and connectors for damage.
1. Start the engine and allow it to reach operating temperature.
2. With the scan tool, select View DTCs.


Is the status Active for this DTC?

Yes


No


2. BATTERY POSITIVE (+) CIRCUIT HIGH RESISTANCE

WARNING:

When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.



NOTE: Make sure all testing equipment and cables are clear of any engine parts before starting the engine.
1. Start the engine.
2. Measure the voltage between the B (+) Terminal at the Generator and the Battery Positive (+) Post.


Is the voltage above 0.25 Volt?

Yes


No


3. GENERATOR CASE GROUND HIGH RESISTANCE



NOTE: Make sure all testing equipment and cables are clear of any engine parts before starting the engine.
1. Start the engine and allow it to reach operating temperature.
2. Measure the voltage between the Generator case and the Battery Negative (-) post.


Is the voltage above 0.25 Volt?

Yes


No


4. (A908) FUSED B+ CIRCUIT HIGH RESISTANCE

1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) C1 harness connector.
3. Turn the ignition on.
4. Using a 12-Volt test light connected to ground, check the (A908) Fused B+ circuit in the PCM C1 harness connector.


NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.


Is the test light illuminated and bright?

Yes


No


5. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.


Were any problems found?

Yes


No