Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 79 (REAR DIFFERENTIAL)
2002 Honda Civic Si
Section 79 (Rear Differential)
2002 Honda Civic SiSECTION Section 79 (Rear Differential)
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
- Special Tools
- Component Location Index
- General Troubleshooting Information
- VTM-4 Indicator
- Diagnostic Trouble Code (DTC)
- Self-diagnosis
- Initialization of the VTM-4 Control Unit
- How to Check for Diagnostic Trouble Codes (DTCs)
- How to Troubleshoot Circuits at the VTM-4 Control Unit
- How to Clear the VTM-4 Control Unit Memory
- How to End a Troubleshooting Session (required after any troubleshooting)
- DTC Troubleshooting Index
- Symptom Troubleshooting Index
- System Description
- Circuit Diagram
- DTC Troubleshooting
- DTC 21-1, 21-2, 22-1, 22-2: Front Wheel Sensors
- DTC 23-1, 23-2, 24-1, 24-2: Rear Wheel Sensors
- DTC 26-1: VSA Modulator-Control Unit or Wire Harness
- DTC 37-1, 38-1: Engine RPM Signal Circuit
- DTC 41-1, 41-2: CAN Communication (PCM/ VSA System)
- DTC 42-1, 42-2, 43-1: Differential Oil Temperature Sensor
- DTC 44-1: VTM-4 Relay
- DTC 51-1, 52-1, 53-1, 53-2, 54-1: Left Clutch Electromagnetic Coil
- DTC 53-2, 55-1, 56-1, 57-1, 58-1: Right Clutch Electromagnetic Coil
- DTC 59-1: Right/Left Clutch Electromagnetic Coil Power Supply
- DTC 73-1: MAP (Manifold Absolute Pressure) Sensor, or PCM
- DTC 76-1: Rear Differential Clutch Warning System
- DTC 77-1: Pcm
- DTC 78-1: VTM-4 Control Unit
- Symptom Troubleshooting
- The VTM-4 indicator comes on, but no DTCs are stored in any system: VTM-4, VSA, or PGM-FI
- The VTM-4 indicator does not come on
- The VTM-4 LOCK indicator does not come on when the VTM-4 LOCK button is pressed
- The VTM-4 LOCK indicator comes on when the ignition switch is turned ON (II) and does not go off
- The VTM-4 LOCK indicator does not come on for about 4 seconds when the ignition switch is turned ON (II)
- Differential Fluid Inspection and Replacement
- Differential Function Test
- Differential Oil Temperature Sensor Replacement
- VTM-4 LOCK Button Test/ Replacement
- VTM-4 Control Unit Replacement
- VTM-4 Relay Replacement
- Differential Mount Replacement
- Differential Removal
- Backlash Inspection
- Differential Installation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.