Diagnostic Routine H

Diagnostic Routine H

Diagnostic Overview

U3003:16, U3003:17

Refer to Wiring Diagram Set 55 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect the generator and battery wiring, terminals or connectors.

- Inspect for loose or corroded generator and battery connections.

Pinpoint Test

1. CLEAR DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, clear all DTCs (Diagnostic Trouble Codes).

3. Using a scan tool, perform a HVAC (Heating, Ventilation, and Air Conditioning) module self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or U3003:17 present?








2. RETRIEVE PCM (Powertrain Control Module) DTCs (Diagnostic Trouble Codes)

1. Start the engine.

2. Using a scan tool, perform PCM (Powertrain Control Module) self-test.

Are any charging system DTCs (Diagnostic Trouble Codes) present in the PCM (Powertrain Control Module)?








3. CHECK BATTERY CONDITION

1. Ignition OFF.

2. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.

Does the battery pass the condition test?








4. CHECK THE CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine RPM (Revolutions Per Minute) to exceed 2,000 RPM (Revolutions Per Minute) while carrying out this step or the generator may self-excite, resulting in default charging system output voltage. If engine RPM (Revolutions Per Minute) has exceeded 2,000 RPM (Revolutions Per Minute), shut the vehicle off and restart the engine before carrying out this step.

1. Start the engine.

2. Measure the voltage of the battery:

- For DTC (Diagnostic Trouble Code) U3003:17, turn off all accessories and run the engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes.
- For DTC (Diagnostic Trouble Code) U3003:16, turn on headlights and HVAC (Heating, Ventilation, and Air Conditioning) fan on high and run engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes.

Is the battery voltage between 13-15.2 volts?








5. CHECK THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE VOLTAGE SUPPLY CIRCUIT FOR HIGH RESISTANCE

1. Ignition OFF.

2. Measure and record the voltage at the battery.

3. Disconnect: HVAC (Heating, Ventilation, and Air Conditioning) Module C228A.

4. Ignition ON.

5. Measure:





Is the voltage within 0.2 volt of the recorded battery voltage?








6. CHECK THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE GROUND CIRCUIT FOR HIGH RESISTANCE

1. Ignition OFF.

2. Measure:





Is the resistance less than 3 ohms?








7. CHECK FOR CORRECT HVAC (Heating, Ventilation, and Air Conditioning) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all HVAC (Heating, Ventilation, and Air Conditioning) module connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?