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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P2503-CHARGING SYSTEM OUTPUT LOW DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1
NOTE: Inspect the vehicle for aftermarket accessories that may exceed the Generator System output.
Ignition on, engine not running.
NOTE: The battery must be fully charged.
NOTE: The Generator belt tension and condition must be checked before continuing.
With the DRBIII®, read DTCs and record the related Freeze Frame data.With the DRBIII®, erase DTCs.Start the engine.Allow the idle to stabilize.Ignition on, engine not running.With the DRBIII®, read DTCs.Is the Good Trip Counter displayed and equal to zero?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 3 .		 All
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: Ensure all wires are clear of the engine's moving parts.
Start the engine.Warm the engine to operating temperature.Measure the voltage between the Generator B+ Output Terminal and the Battery+ Post.Is the voltage above 0.4 of a volt?Yes --> Repair the high resistance in the Battery Positive circuit between the Generator and Battery.Perform POWERTRAIN VERIFICATION TEST VER - 3 .No --> Go To 3		 All
3
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: Make sure all wires are clear of the engine's moving parts.
Measure the voltage between the Generator Case and Battery ground post.Is the voltage above 0.1 of a volt?Yes --> Repair high resistance in the Generator Case Ground.Perform POWERTRAIN VERIFICATION TEST VER - 3 .No --> Go To 4		 All
4 Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light, jump it across the Generator Field harness connector.
Ignition on, engine not running.
With the DRBIII®, actuate the Generator Field Driver circuit.
Does the test light illuminate brightly and flash on and off?
Yes --> Replace the Generator.
Perform POWERTRAIN VERIFICATION TEST VER - 3 .
No --> Go To 5		 All
5 Turn the ignition off.
Using a 12-volt test connected to battery voltage, probe the (Z932) Generator Ground circuit in the Generator Field harness connector.
Does the test light illuminate brightly?
Yes --> Go To 6
No --> Repair the open in the (Z932) Generator Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3 .		 All
6 Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K125) Gen Field Control circuit at the Generator Field harness connector.
Is the voltage above 1.0 volt?
Yes --> Repair the short to voltage in the (K125) Gen Field Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3 .
No --> Go To 7		 All
7 Turn the ignition off.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K125) Gen Field Control circuit from the Generator Field harness connector to the appropriate terminal of the special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 8
No --> Repair the open in the (K125) Gen Field Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3 .		 All
8 Measure the resistance between ground and the (K125) Gen Field Control circuit in the Generator Field harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the short to ground in the (K125) Gen Field Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3 .
No --> Go To 9		 All
9
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 3 .		 All
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