5A
DTC P0712 (No.38): Transmission Fluid Temperature Sensor Circuit Low
Wiring Diagram
1. TCM [A]: Terminal arrangement of TCM connector (M13 engine model with VVT) (viewed from harness side)
2. Transmission fluid temperature sensor [B]: Terminal arrangement of TCM connector (M13 engine model without VVT) (viewed from harness side)
3. A/T      
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Transmission temperature sensor terminal voltage is less than 0.05 V for 5 minutes or more after turning ignition switch ON.
• Transmission fluid temperature sensor or its circuit malfunction.
• TCM
DTC Confirmation Procedure
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC in TCM memory and start engine.
3) Keep engine running at idle speed for 10 minutes or more.
4) Stop vehicle and check DTC.
Troubleshooting
Step Action YES NO
1
Was A/T System Check performed?
Go to Step 2.
Go to A/T System Check .
2
Check Transmission Fluid Temperature Circuit for Ground Short
Check continuity between terminal “E121-11” [A] or “E123-5” [B] of disconnected harness side TCM connector and ground.
Is continuity indicated?
“BLU/RED” circuit shorted to ground.
Go to Step 3.
3
Check Transmission Fluid Temperature Circuit for IG Short
1) Cool down A/T fluid temperature under ambient temperature.
2) Connect TCM connectors to TCM with ignition switch OFF.
3) Turn ignition switch ON.
4) Measure voltage between terminal “E121-11” [A] or “E123-5” [B] of TCM connector and ground.
Is it 4.6 V or more?
“BLU/RED” circuit shorted to power circuit.
If circuit is OK, go to Step 4.
Intermittent trouble or faulty TCM.
Check for intermittent referring to Intermittent and Poor Connection Inspection .
If OK, substitute a known-good TCM and recheck.
4
Inspect Transmission Fluid Temperature Sensor
Inspect transmission temperature sensor referring to Transmission Fluid Temperature Sensor Inspection .
Is result satisfactory?
Intermittent trouble or faulty TCM.
Check for intermittent referring to Intermittent and Poor Connection Inspection .
If OK, substitute a known-good TCM and recheck.
Replace transmission fluid temperature sensor.