Toyota 4Runner: Diagnostic Trouble Code Chart

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/o Smart Key System) / Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

HINT:

If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below.

Transponder Key ECU Assembly

DTC Code	Detection Item	Trouble Area
B2780	Push Switch / Key Unlock Warning Switch Malfunction	- Transponder key ECU assembly - Unlock warning switch assembly - Harness or connector
B2784	Antenna Coil Open / Short	Transponder key amplifier
B2793	Transponder Chip Malfunction	Key
B2794	Unmatched Encryption Code	Key
B2795	Unmatched Key Code	Key
B2796	No Communication in Immobiliser System	- Transponder key ECU assembly - Key - Harness or connector - Transponder key amplifier
B2797	Communication Malfunction No. 1	- Transponder key ECU assembly - Key - Harness or connector - Transponder key amplifier
B2798	Communication Malfunction No. 2	Key

HINT:

The DTCs for the engine immobiliser system are specified above. If other codes are output, check the DTC chart for the SFI system.

ECM

DTC Code	Detection Item	Trouble Area
B2799	Engine Immobiliser System Malfunction	- Harness or connector - Transponder key ECU assembly - ECM
B279A	Theft Deterrent System Communication Line High Fixation	- Harness or connector - Transponder key ECU assembly - ECM
B279C	Theft Deterrent System Presence Detection	ECM

DTC Code

Detection Item

Trouble Area

See page

B2799

Engine Immobiliser System Malfunction

- Harness or connector

- Transponder key ECU assembly

- ECM

B279A

Theft Deterrent System Communication Line High Fixation

- Harness or connector

- Transponder key ECU assembly

- ECM

B279C

Theft Deterrent System Presence Detection

ECM

Data List / Active Test

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Antenna Coil Open / Short (B2784)

DESCRIPTION The antenna coil receives key code signals from the transponder chip in the key grip. The coil is built into the transponder key amplifier, which amplifies the key code signals and ou ...

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