TM 10-3930-675-20-1 0020 00-18 ENGINE TEMPERATURE SENSORS AND CIRCUITS TROUBLESHOOTING - CONTINUED 0020 00 Table 6. Error Code 1155 - Intake Air Temperature Sensor Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error   Code   1155   -   Intake   Air   Temperature Sensor Circuit Failure 1. Check coolant level (TM 10- 3930-675-10). Add coolant as required (TM 10- 3930-675-10). 2. Check  radiator  top  and  side grille    for    mud,    snow    or obstructions. Clear obstructions. 3. Check for loose coolant hoses and clamps. Tighten  or  replace  as  required (WP 0064 00). 4. Enter “DIAG EXTRA FUNCT”  4  (13)  menu  and check    water    level    sensor setting. Enter “0” shut off and “1” to run cooling fan. Check if fording water level sensor is clogged or damaged. a.  Clean and/or replace fording  water  level  sensor (WP 0090 00). b. If problem continues, notify SRA. Table 7. Error Code 1212 - Oil Temperature Sensor Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error  Code  1212  -  Oil  Temperature  Sensor Circuit Failure 1. Ensure that ignition switch is in  OFF  position.  Disconnect engine    harness    from    oil pressure/temperature   sensor (WP 0093 00). a.  Inspect oil pressure/ temperature    sensor    and engine  harness  connectors for  dirty,  corroded,  bent, broken, and pushed back or extended pins. Clean and repair connector(s) as required (WP 0111 00). b. Check oil pressure/ temperature    sensor    and engine  harness  for  dirt  or moisture in or on connectors and for missing or damaged connector seals. Remove dirt and moisture from connector.  Replace  missing  or damaged  connector  seals  (WP 0111 00). 2. Place ignition switch in OFF position and disconnect engine    harness    from    oil pressure/temperature sensor.