5A
DTC P1705 (No.51): Engine Coolant Temperature Signal Circuit Malfunction (M13A Model without VVT)
Wiring Diagram
1. TCM [A]: Terminal arrangement of TCM connector (M13 engine model with VVT) (viewed from harness side)
2. ECM [B]: Terminal arrangement of ECM connector (M13 engine model without VVT) (viewed from harness side)
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
• Too long high signal of pulse signal from ECM to TCM continues out of specification.
or
• Too long low signal of pulse signal from ECM to TCM continues out of specification.
or
• Too short low signal of pulse signal from ECM to TCM is detected in continues 8 pulses.
• Engine coolant temperature sensor or its circuit malfunction.
• Engine coolant temperature signal circuit from ECM to TCM open or short.
• TCM
• ECM
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories.
3) After 2 minutes passed from turning ignition switch ON, 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
Is there DTC related to engine coolant temperature sensor (P0115)?
Go to corresponding DTC Table:M13A without VVT .
Go to Step 3.
3
Check Engine Coolant Temperature Signal Circuit for IG Short.
1) Turn ignition switch OFF.
2) Disconnect TCM and ECM connectors from TCM and ECM.
3) Check proper connection to TCM at terminal “E124-7” and to ECM at terminal “E113-17”.
4) If OK, turn ignition switch ON and measure voltage between terminal “E124-7” of disconnected harness side TCM connector and ground.
Is it 10 – 14 V?
“YEL/RED” circuit shorted to power circuit.
Go to Step 4.
4
Check Engine Coolant Temperature Signal Circuit for Open
1) Turn ignition switch OFF.
2) Check continuity between terminal “E124-7” of disconnected harness side TCM connector and terminal “E113-17” of disconnected harness side ECM connector.
Is continuity indicated?
Go to Step 5.
“GRY/BLK” circuit open.
5
Check Engine Coolant Temperature Signal Circuit for Ground Short
Check continuity between terminal “E124-7” of disconnected harness side TCM connector and ground.
Is continuity indicated?
“YEL/RED” circuit shorted to ground.
Go to Step 6.
6
Inspect Engine Coolant Temperature Sensor
Inspect engine coolant temperature sensor referring to Engine Coolant Temperature (ECT) Sensor Inspection:M13A .
Is inspection result OK?
Intermittent trouble or faulty TCM or ECM. Check for intermittent referring to Intermittent and Poor Connection Inspection . If OK, substitute a known-good TCM or ECM and recheck.
Replace engine coolant temperature sensor.