#
DTC C1277

id010200003100

DTC C1277 | Steering angle sensor circuit malfunction
--- | ---
DETECTION CONDITION | • The PCM monitors input voltage from the steering angle sensor. If the input voltage at PCM terminal 1M or 1R is 4.9 V or more or 0.1 V or less, the PCM determines that the steering angle sensor circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Steering angle sensor malfunction • Poor connection at connectors (female terminal) • Improper installation or positioning of the steering angle sensor • Open circuit in the wiring harness between steering angle sensor terminal A and ignition switch • Open circuit in the wiring harness between steering angle sensor terminal B and PCM terminal 1M, short to power or to ground • Open circuit in the wiring harness between steering angle sensor terminal D and PCM terminal 1R, short to power or to ground • Open circuit in the wiring harness between steering angle sensor terminal C and body ground. • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | PERFORM DTC CONFIRMATION PRODESERE • Perform DTC CONFIRMATION PROCEDURE. • Is the same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedures.
2 | INSPECT STEERING ANGLE SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the steering angle sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 11.
No | Go to the next step.
3 | INSPECT STEERING ANGLE SENSOR POWER SUPPLY FOR OPEN CIRCUIT • Turn the ignition switch to the ON position. (Engine off) • Measure the voltage between the steering angle sensor terminal A and body ground. • Is the voltage B+? | Yes | Go to the next step.
No | Repair or replace the harness for open circuit between steering angle sensor terminal A and ignition switch, then go to Step 11.
4 | INSPECT STEERING ANGLE SENSOR GROUND FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the steering angle sensor terminal C and body ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the harness for open circuit between steering angle sensor terminal C and body ground, then go to Step 11.
5 | INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER • Turn the ignition switch to the ON position. (Engine off) • Measure the voltage between the following steering angle sensor connector terminals (vehicle harness-side) and body ground: - Steering angle sensor (Sensor 1): B and body GND - Steering angle sensor (Sensor 2): D and body GND • Is the voltage B+? | Yes | Repair or replace wiring harness for short to power, then go to Step 11.
No | Go to the next step.
6 | INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Turn the ignition switch off. • Inspect for continuity between the following steering angle sensor terminals (vehicle harness-side) and body ground: - Steering angle sensor (Sensor 1): B and body GND - Steering angle sensor (Sensor 2): D and body GND • Is there continuity? | Yes | Repair or replace wiring harness for short to GND, then go to Step 11.
No | Go to the next step.
7 | INSPECT FOR IMPROPER INSTALLATION OF STEERING ANGLE SENSOR • Is the installation normal? | Yes | Go to the next step.
No | Repair or replace the steering angle sensor, then go to the Step 11.
8 | INSPECT STEERING ANGLE SENSOR • Inspect the steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.) • Is there any malfunction? | Yes | Replace the steering angle sensor, then go to Step 11. (See STEERING ANGLE SENSOR REMOVAL/INSTALLATION.)
No | Go to the next step.
9 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 11.
No | Go to the next step.
10 | INSPECT STEERING ANGLE SENSOR CIRCUIT FOR OPEN CIRCUIT • Disconnect the PCM connectors. • Inspect for continuity between PCM terminals (vehicle harness-side) and body ground: - Steering angle sensor (Sensor 1): 1M-B - Steering angle sensor (Sensor 2): 1R-D • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to the next step.
11 | VERIFY TROUBLESHOOTING OF DTC C1277 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the PENDING CODE for this DTC present? | Yes | Replace the PCM, then go to the next step.
No | Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC table (With WU-TWC).)
No | DTC troubleshooting completed.