Inspection and Verification
Inspection and Verification
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. Failure to follow these instructions may result in personal injury.
WARNING: Batteries normally produce explosive gases. 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. Failure to follow these instructions may result in personal injury.
WARNING: When lifting a 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 battery. Lift with a battery carrier or with your hands on opposite corners. Failure to follow these instructions may result in personal injury.
NOTICE: Do not make jumper connections except as directed. Incorrect connections may damage the voltage regulator test terminals, fuses or fusible links.
NOTICE: Do not allow any metal object to come in contact with the generator housing and internal diode cooling fins. A short circuit may result and burn out the diodes.
NOTE: While carrying out any pinpoint test, disregard the DTCs set while following a specific pinpoint test. After the completion of any test, be sure to clear all DTCs in the PCM.
NOTE: All voltage measurements are referenced to the negative (-) battery post unless otherwise specified.
NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the PCM relearns its fuel trim. The vehicle may need to be driven to relearn the strategy.
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. Verify the battery condition.
5. Check the operation of the charging system warning indicator in the instrument cluster (IC) as follows:
- With the key in the OFF position, the charging system warning indicator should be off.
- With the key in the ON position and the engine OFF, the charging system warning indicator should be on.
- With the engine running, the charging system warning indicator should be off.
6. Turn off the headlamps and the A/C system (if equipped). Turn the climate control blower to low/off. Check the battery voltage before and after starting the engine to determine if the battery voltage increases.
7. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
8. NOTE:The vehicle communication module (VCM) LED prove-out confirms voltage and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
- check the connection to the vehicle.
- refer to Information Bus to diagnose no communication with the scan tool. Information Bus
9. If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to Information Bus to diagnose no response from the PCM. Information Bus
10. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Information Bus. Information Bus
- If the network test passes, retrieve and record continuous memory DTCs.
11. Clear the continuous DTCs and carry out the self-test diagnostics for the PCM.
12. If the DTCs retrieved are related to the concern, go to DTC Chart. For all other DTCs, refer to appropriate system.
13. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures
NOTE: DTC P0622 may be set by the loss of the communication lines between the generator and the PCM. The charging system warning indicator then illuminates until the engine is operated at greater than 4,500 rpm (approximately wide open throttle [WOT]) for a minimum of 3 seconds. At this time, the generator self-excites. The charging system warning indicator remains illuminated and the generator operates in a default mode (approximately 13.5 volts) until the engine is turned off.