DTC P2500 or P2501
Diagnostic Instructions
DTC Descriptors
| DTC P2500: Generator L-Terminal Circuit Low
Voltage |
| DTC P2501: Generator L-Terminal Circuit High
Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
B+
|
P0622, P0625
|
P0621, P0625
|
-
|
-
|
Control
|
P0621, P2500
|
P0621, P2500
|
P0621, P2501
|
-
|
Signal
|
P0622, P0625
|
P0622, P0625
|
P0622, P0626
|
P0622
|
|
| |
Circuit/System Description
The engine control module (ECM) uses the generator turn ON
control circuit to control the load of the generator on the engine.
A high side driver in the ECM applies a voltage to the voltage
regulator. This controls the voltage regulator to turn the field
circuit ON and OFF. The ECM monitors the state of the generator
turn ON control circuit. The ECM should detect low voltage on
generator turn on control circuit when the ignition is ON and the
engine is OFF, or when the charging system malfunctions. With the
engine running, the ECM should detect high voltage on the generator
turn on control circuit.
Conditions for Running the DTC
| • |
The ignition ON, engine OFF
for ignition on test. |
| • |
The engine is running for the
run test. |
Conditions for Setting the DTC
| • |
During the ignition on test,
the ECM detects voltage on the generator turn on control circuit
for 5 s. |
| • |
During the run test, the ECM
detects low voltage on the generator turn on control circuit for 15
s. |
Action Taken When the DTC Sets
DTC P2500 and P2501 are C type DTCs.
Conditions for Clearing the DTC
DTC P2500 and P2501 are C type DTCs.
Reference Information
Schematic Reference
Starting and Charging Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Charging System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
| 1. |
Verify that a test lamp
illuminates between the G13 Generator B+ output circuit terminal 1
X1 and ground. |
| ⇒ |
If the test lamp does not illuminate, test the B+
circuit for an open/high resistance. |
| 2. |
Ignition OFF, disconnect the
X2 harness connector at the G13 Generator and the appropriate
harness connector at the K20 Engine Control Module. |
| 3. |
Test for less than 5 Ω
between the X2 harness connector L-terminal and the appropriate
harness connector at the K20 Engine Control Module as listed
below: |
| |
• |
LBS or LSF - X1 terminal
21 |
| |
• |
LDE or LLU - X2 terminal
1 |
| ⇒ |
If not the specified value, test the L-terminal
circuit for an high/open resistance. |
| 4. |
Test for infinite resistance
between the G13 Generator harness connector L-terminal and
ground. |
| ⇒ |
If less than the specified range, test for short
to ground or a short to voltage. |
| 5. |
Connect the harness connector
at the K20 Engine Control Module. |
| 6. |
Adapt the G13 Generator
F-terminal to the X2 harness connector F-terminal. |
| 7. |
Engine run at 2 500 RPM,
verify the battery voltage is 12.6-15 V. |
| ⇒ |
If not the specified value, refer to
Charging System Test . If the circuit tests normal, test the
G13 Generator before replacing. |
| 8. |
If the circuit tests normal,
replace the K20 Engine Control Module. |
Component Testing
Dynamic Test
| 1. |
Connect a oscilloscope at the
G13 Generator terminal B+ X1 and the G13 Generator generator
housing. |
| 2. |
Engine run at 2 500
RPM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
