how to fix P0700 code on Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

568 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0700 transmission control system malfunction in Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0700

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before opening transmission components.

Symptoms

•Check engine light illuminated
•Transmission slipping or shifting delays
•Harsh or erratic shifting
•Engine stalling or rough idle
•Decreased fuel efficiency
•Transmission fluid leaks

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and any associated codes.
2
Inspect the transmission fluid level and condition; look for contamination or burnt smell.
3
Check the wiring and connectors leading to the transmission control module (TCM) for damage or corrosion.
4
Inspect the transmission control module for faults or internal damage.
5
Conduct a visual inspection of the transmission for any signs of external leaks or damage.
6
If applicable, check the vehicle's battery voltage and ground connections to ensure proper electrical supply.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Fluid pump
•Transmission fluid
•Funnel
•Multimeter
•Screwdriver
•Wire brush
•Socket set
•Torque wrench

Parts Required

•Transmission fluid (as per specifications)
•Transmission control module (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and any associated codes.
2
Inspect the transmission fluid level and condition; look for contamination or burnt smell.
3
Check the wiring and connectors leading to the transmission control module (TCM) for damage or corrosion.
4
Inspect the transmission control module for faults or internal damage.
5
Conduct a visual inspection of the transmission for any signs of external leaks or damage.
6
If applicable, check the vehicle's battery voltage and ground connections to ensure proper electrical supply.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.
Raise the vehicle using jack stands for easier access to the transmission.

2. Addressing Transmission Fluid Issues

Tools Required: Fluid pump, transmission fluid, funnel
Check the transmission fluid level; if low, add the appropriate type of transmission fluid as specified in the owner’s manual.
If the fluid is dirty or burnt, perform a transmission fluid change:
1. Remove the transmission drain plug and drain the old fluid into a suitable container.
2. Replace the drain plug and torque it to the manufacturer’s specifications.
3. Using a fluid pump, refill the transmission with new fluid through the dipstick tube or designated fill location.

3. Repairing Electrical Issues

Tools Required: Multimeter, screwdriver, wire brush
Inspect the wiring harness and connectors:
1. Disconnect the wiring harness from the TCM and visually inspect for signs of wear or corrosion.
2. Use a multimeter to test for continuity and proper voltage supply to the TCM.
3. Clean any corroded connectors with a wire brush and reconnect securely.

4. Replacing the Transmission Control Module (if necessary)

Tools Required: Socket set, torque wrench
If the TCM is faulty:
1. Remove any protective covers to access the TCM.
2. Disconnect the wiring harness from the TCM.
3. Unscrew the TCM from its mounting location and remove it.
4. Install the new TCM, securing it with screws and reconnecting the wiring harness.
5. Replace any protective covers.

5. Reconnect Battery and Clear Codes

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any stored codes, including P0700.