how to diagnose P0700 code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during the repair.
• Make sure the vehicle is on a flat surface and securely raised if working underneath.

2. Check Transmission Fluid

• Remove the transmission dipstick and inspect fluid level.
• If low, add the recommended transmission fluid (Honda ATF-Z1 or compatible).
• If the fluid is dark or smells burnt, consider a transmission fluid change.

3. Inspect Wiring and Connectors

• Visually inspect the wiring harness connected to the TCM for any frays or broken wires.
• Clean any corroded connectors with electrical contact cleaner and securely reconnect them.

4. Test the TCM

• Using a multimeter, set it to the appropriate voltage range.
• Check the voltage at the TCM connectors while the ignition is on (engine off) and while the engine is running to ensure proper signal output.
• Replace the TCM if it fails to provide the correct readings.

5. Inspect Transmission Range Sensor

• Locate the transmission range sensor on the transmission.
• Disconnect the electrical connector and check for continuity using a multimeter.
• If faulty, replace the range sensor and ensure it is correctly aligned.

6. Reassemble and Reconnect

• Reconnect any components that were removed during inspection.
• Reconnect the negative battery terminal.
• Start the vehicle and check for any new fault codes.