Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Inspect and test the Battery with the Midtronics Battery Tester or equivalent for a shorted or dead cell before continuing with this test.

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

NOTE:
Inspect the fusible link in the charge wire or fuses in the PDC depending on application. If an open fusible link or 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 idle.
2. With the scan tool, navigate to data display and monitor the voltage sense to the PCM.
  Is the voltage within 0.2 volts of the target charging voltage?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
  No
  - Go To 2
VISUALLY INSPECT THE ALTERNATOR BELT AND TENSIONER
1. Turn the ignition off.
2. Inspect the Alternator belt and tensioner.
  Are the belt and tensioner installed properly?
  
  Yes
  - Go To 3
  No
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR HIGH RESISTANCE IN THE BATTERY POSITIVE CIRCUIT
1. Perform a voltage drop test between the Battery Positive (+) Post;
  - and the Alternator stud.
  - and the PDC B+ terminal.
  Is the voltage reading above 0.2 volts for either measurement?
  
  Yes
  - Repair the Battery Positive (+) circuit for high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK FOR HIGH RESISTANCE IN THE BATTERY GROUND CABLE
1. Perform a voltage drop test between the Battery Negative (-) post;
  - and a good engine ground.
  - and a good body ground.
  Is the voltage reading above 0.2 volts for either measurement?
  
  Yes
  - Repair the Battery ground circuit for high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (A209) FUSED B+ CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the PCM C1 harness connector.
  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 the GPEC Diagnostic Adaptor to perform the diagnosis.
2. Connect the (special tool #10436, Adapter, GPEC Diagnostic) in line with the PCM C1 harness connector.
3. Start the engine and allow it to idle.
4. Using a voltmeter, measure the voltage at the (A209) Fused B+ circuit at the GPEC Adaptor.
  NOTE:
  Compare the voltage reading to the voltage at the Alternator output stud. Approximately 2.0 Ohms of resistance in this circuit can drop the voltage by approximately 0.5 volts.
  
  Is the voltage within 0.2 volts of the measurement at the Alternator output stud?
  
  Yes
  - Go To 6
  No
  - Repair the (A209) Fused B+ circuit for high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Perform the NO RESPONSE FROM THE PCM test procedure. Refer to the appropriate Diagnostic information .
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Alternator and the Powertrain Control Module (PCM).
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
5. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - If the PCM powers and grounds test good, replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .