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DTC B1702: Transponder read error
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
OPERATION
The key reminder switch (ignition key ring antenna) supplies the ignition key with power, and the ignition key sends the key ID to the ETACS-ECU. ETACS-ECU receives the key ID with the key ring antenna, and judges if the ignition key is the registered one.
 
 
 
TROUBLE JUDGMENT
  • DTC No. B1702 is stored when there are other ignition keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the ignition key that is going to start the engine.
  • If the key ID is not sent to the ETACS-ECU even when the ignition switch is turned to the "ON" position, DTC No. B1702 is stored.
noteDTC No. B1702 is always set along with MFI system DTC No. P0513.
 
 
 
TROUBLESHOOTING HINTS
  • Interference of the key ID
  • The key ring antenna (antenna wire)* may be defective.
    note*: The DTC No. B1722 will be set if a trouble occurs in the key ring antenna.
  • The ignition key may be defective.
  • The ETACS-ECU may be defective.
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Check if DTC No. B1722 is stored in the ETACS-ECU.
Is DTC No. B1722 set?
Refer to .
Go to Step 2.
 
STEP 2. Check the ignition key inserted in the key hole for interference.
Are there other ignition keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the ignition key inserted in the key hole?
Move away or remove other ignition keys or things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the ignition key. Then, go to Step 4.
Go to Step 3.
 
STEP 3. Check with the spare key that has already been registered.
Check that the engine starts using the spare key that has already been registered.
Is DTC No. B1702 set?
Replace the ETACS-ECU. After registering the ID codes, go to Step 4.
Replace the ignition key for which DTC No. B1702 is stored, and register the ID codes again (Refer to ). After registering the ID codes, go to Step 4.
 
STEP 4. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position once, and then turn it to the "ON" position again.
(2) On completion, check that DTC No. B1702 is not reset.
Is DTC No. B1702 set?
Return to Step 1.
The diagnosis is complete. If another DTC is stored, refer to DTC Chart .