Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - THEFT DETERRENT / KEYLESS ENTRY
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE SWITCH)
DTC B278A Short to GND in Immobiliser System Power Source Circuit
DESCRIPTION
This DTC is output when the engine switch power source supply line is open or shorted.
| DTC Code | DTC Detection Condition | Trouble Area |
| B278A | The engine switch power source supply line is open or shorted. | Harness or connector Engine switch Certification ECU (Smart key ECU) |
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE SWITCH) |
Disconnect the E29 ECU connector.
Disconnect the E18 switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E29-30 (VC5) - E18-14 (VC5) Always Below 1 Ω E29-40 (AGND) - E18-8 (AGND) E29-30 (VC5) or E18-14 (VC5) - Body ground Always 10 kΩ or higher E29-40 (AGND) or E18-8 (AGND) - Body ground
|
| ||||
| OK | |
| 2.REPLACE ENGINE SWITCH |
for 1GR-FE
Temporarily replace the engine switch with a new one ().
for 1UR-FE
Temporarily replace the engine switch with a new one ().
for 1VD-FTV
Temporarily replace the engine switch with a new one ().
for 3UR-FE
Temporarily replace the engine switch with a new one ().
| NEXT | |
| 3.CLEAR DTC |
Clear the DTCs ().
| NEXT | |
| 4.CHECK FOR DTC |
Check for DTCs ().
- OK:
- DTC B278A is not output.
|
| ||||
| OK | ||
| ||