DTC C1279, C1280, C1281, C1282, C1951, C1952, C1959, C2768
id040200801700
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DTC
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C1279, C1280, C1281, C1282, C1951, C1952, C1959, C2768
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Combined sensor system
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DETECTION CONDITION
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• C1279
• C1280
• C1281
• C1282
• C1951
• C1952
• C1959
• C2768
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POSSIBLE CAUSE
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• Open circuit in the wiring harness between ignition switch and combined sensor terminal E or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal Y and combined sensor terminal F or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AA and combined sensor terminal B or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AI and combined sensor terminal D
• Open circuit in the wiring harness between DSC HU/CM terminal AE and combined sensor terminal A or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AB and combined sensor terminal C or short circuit to ground
• Combined sensor malfunction
• Poor connection at connectors (female terminal)
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT COMBINED SENSOR POWER SUPPLY FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position (engine off).
• Measure voltage between combined sensor terminal E (harness-side) and ground.
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between combined sensor terminal E and ignition switch, then go to Step 12.
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2
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INSPECT COMBINED SENSOR GROUND FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Disconnect DSC HU/CM and combined sensor connectors.
• Inspect for continuity between DSC HU/CM terminal Y (harness-side) and combined sensor terminal F (harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between DSC HU/CM terminal Y and combined sensor terminal F, then go to Step 12.
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3
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INSPECT COMBINED SENSOR (YAW RATE PART) SIGNAL FOR OPEN CIRCUIT
• Inspect for continuity between DSC HU/CM terminal AA (harness-side) and combined sensor terminal B (harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AA and combined sensor terminal B, then go to Step 12.
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4
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INSPECT COMBINED SENSOR (YAW RATE PART) SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AA (harness-side) and ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AA and combined sensor terminal B, then go to Step 12.
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No
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Go to the next step.
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5
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INSPECT COMBINED SENSOR (LATERAL-G PART) SIGNAL FOR OPEN CIRCUIT
• Inspect for continuity between DSC HU/CM terminal AI (harness-side) and combined sensor terminal D (harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AI and combined sensor terminal D, then go to Step 12.
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6
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INSPECT COMBINED SENSOR (LATERAL-G PART) SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AI (harness-side) and ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AI and combined sensor terminal D, then go to Step 12.
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No
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Go to the next step.
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7
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INSPECT REFERENCE SIGNAL FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AE (harness-side) and combined sensor terminal A (harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AE and combined sensor terminal A, then go to Step 12.
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8
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INSPECT REFERENCE SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AE (harness-side) and ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AE and combined sensor terminal A, then go to Step 12.
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No
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Go to the next step.
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9
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INSPECT TEST SIGNAL FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AB (harness-side) and combined sensor terminal C (harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AB and combined sensor terminal C, then go to Step 12.
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10
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INSPECT TEST SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM terminal AB (harness-side) and ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AB and combined sensor terminal C, then go to Step 12.
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No
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Go to the next step.
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11
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INSPECT COMBINED SENSOR
• Inspect the combined sensor.
(See COMBINED SENSOR INSPECTION.)
• Is the combined sensor normal?
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Yes
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Go to the next step.
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No
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Replace the combined sensor, then go to the next step.
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12
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VERIFY DTC TROUBLESHOOTING COMPLETED.
• Clear the DTC from the memory.
(See ON-BOARD DIAGNOSIS.)
• Are the same DTCs present?
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Yes
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Replace the DSC HU/CM, then go to the next step.
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No
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Go to the next step.
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13
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VERIFY AFTER REPAIR PROCEDURE.
• Are any other DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS.)
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No
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DTC troubleshooting completed.
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