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Home/Cars/Toyota/Corolla/E170 (2013-2019)/how to diagnose P0700 code in my Toyota Corolla E170 (2013-2019)

how to diagnose P0700 code in my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Severity: highDifficulty: mediumError Code: P07002-4 hours
3 min read
540 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 malfunction in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0700
Component
Transmission
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening the transmission system.

Symptoms

  • •Check engine light illuminated
  • •Harsh or erratic shifting
  • •Delay in acceleration
  • •Transmission overheating
  • •Reduced fuel efficiency

Diagnostic Steps

  1. 1Scan the vehicle's computer using an OBD-II scanner to retrieve any additional trouble codes.
  2. 2Inspect the transmission fluid level and condition; look for signs of contamination or low fluid.
  3. 3Check the wiring and connectors associated with the transmission control module (TCM) for damage or corrosion.
  4. 4Test the TCM for proper voltage and ground using a multimeter.
  5. 5Perform a visual inspection of the transmission for leaks or physical damage.
  6. 6Review the vehicle's service history for any previous transmission repairs or fluid changes.

Solution

Solution

1. Preparation

  • Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, fluid pump.
  • Disconnect the negative battery cable to prevent electrical shorts.
  • Allow the vehicle to cool down if the engine has been running.

2. Inspect and Replace Transmission Fluid

  • Sub-steps:
    1. Locate the transmission fluid dipstick or fill plug.
    2. Remove the dipstick or fill plug and check fluid levels; add fluid if low.
    3. If fluid is dark or has a burnt smell, drain the fluid using a fluid pump.
    4. Replace with the manufacturer-recommended transmission fluid (Toyota ATF WS).
    5. Reinstall the dipstick or fill plug and ensure it is secure.

3. Repair or Replace Wiring/Connectors

  • Sub-steps:
    1. Inspect the wiring harness leading to the TCM and transmission for frays or breaks.
    2. Clean any corroded connectors using electrical contact cleaner.
    3. Repair any damaged wires using solder and heat-shrink tubing.
    4. If connectors are severely damaged, replace them with OEM parts.

4. Test and Replace TCM (if necessary)

  • Sub-steps:
    1. Using a multimeter, check the voltage at the TCM connector according to specifications from the service manual.
    2. If voltage is incorrect, trace the issue back to wiring or fuses.
    3. If TCM is faulty, remove it by unscrewing the mounting bolts and disconnecting the wiring harness.
    4. Install a new TCM by reversing the removal steps, ensuring all connections are secure.

5. Final Check

  • Reconnect the negative battery cable.
  • Clear the P0700 code using the OBD-II scanner.
  • Test drive the vehicle to ensure proper operation.

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
  • Multimeter
  • Socket set
  • Torque wrench
  • Fluid pump

Parts Required

  • Transmission fluid (Toyota ATF WS)
  • Transmission control module (if replacement is necessary)
  • Wiring connectors (if damaged)

Additional Information

Error CodeP0700
Component

Transmission

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

3 items

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