Inspection and Verification - Dual Generators

WARNING:
^ BATTERIES CONTAIN SULFURIC ACID. AVOID CONTACT WITH SKIN, EYES, OR CLOTHING. ALSO, SHIELD YOUR EYES WHEN WORKING NEAR BATTERIES TO PROTECT AGAINST POSSIBLE SPLASHING OF THE ACID SOLUTION. IN CASE OF ACID CONTACT WITH SKIN OR EYES, FLUSH IMMEDIATELY WITH WATER FOR A MINIMUM OF 15 MINUTES AND GET PROMPT MEDICAL ATTENTION. IF ACID IS SWALLOWED, CALL A PHYSICIAN IMMEDIATELY.
^ BATTERIES NORMALLY PRODUCE EXPLOSIVE GASES WHICH CAN CAUSE PERSONAL INJURY. THEREFORE, DO NOT ALLOW FLAMES, SPARKS OR LIGHTED SUBSTANCES TO COME NEAR THE BATTERY. WHEN CHARGING OR WORKING NEAR A BATTERY, ALWAYS SHIELD YOUR FACE AND PROTECT YOUR EYES. ALWAYS PROVIDE VENTILATION.
^ WHEN LIFTING A PLASTIC-CASED BATTERY, EXCESSIVE PRESSURE ON THE END WALLS COULD CAUSE ACID TO SPEW THROUGH THE VENT CAPS RESULTING IN PERSONAL INJURY, DAMAGE TO THE VEHICLE OR TO THE BATTERY. LIFT WITH A BATTERY CARRIER OR WITH YOUR HANDS ON OPPOSITE CORNERS.

1. Verify the customer's concern by operating the engine to duplicate the concern.

Visual Inspection Chart:

2. Inspect to determine if one of the mechanical or electrical concerns apply.
3. If the inspection reveals obvious concern(s) that can be readily identified, service as necessary.
4. Verify the battery condition. Refer to Battery.
5. Observe charging system warning indicator status under the following conditions:
^ The charging system warning indicator will illuminate with the ignition switch in RUN and the engine OFF.
^ The charging system warning indicator will be OFF with the engine running.
^ The charging system warning indicator will be OFF with the ignition switch OFF.

Normal Charging System Voltages:

6. Check the battery voltage before and after starting the engine to determine if the battery voltage increases. Refer to the Normal Charging System Voltages chart.

NOTE:
^ The Powertrain Control Module (PCM) requires three key cycles so that the PCM can re-learn the configuration.
^ On California vehicles the Malfunction Indicator Lamp (MIL) will illuminate if the lower generator circuit has 12 volts which the PCM has commanded it off for two consecutive drive cycles.

7. If the concern remains after the inspection, connect the diagnostic tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the vehicle selection cannot be entered:
^ Check that the program card is correctly installed.
^ Check the connections to the vehicle.
^ Check the ignition switch position.

8. If the diagnostic tool still does communicate with the vehicle, refer to the diagnostic tool operating manual.
9. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
^ SCP+, SCP- or ISO circuits fault; all electronic control units no response/not equipped, refer to Module Communications Network (Information Bus).
^ No response/not equipped for powertrain control module (PCM), refer to Computers and Control Systems.
^ System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the PCM.

10. If the DTCs retrieved are related to the concern, go to the PCM Diagnostic Trouble Code (DTC) Index or the Instrument Cluster Diagnostic Trouble Code (DTC) Index. Powertrain Control Module Diagnostic Trouble Code Index Instrument Cluster Diagnostic Trouble Code Index
11. If no DTCs related to the concern are retrieved, go to the Symptom Chart to continue diagnostics. Diagnosis By Symptom - Dual Generators