P1709

DTC P1709 (No.51): Engine Coolant Temperature and Barometric Pressure Signal Circuit Malfunction

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories by using scan tool.
3) Start engine and run it for 25 minutes or more.
4) Check DTC, pending DTC and freeze frame data.

DTC Troubleshooting

1.
Was "A/T System Check" performed?
YES
Go to Step 2.
NO
Go to A/T System Check.

2.
Is there DTC related to engine coolant temperature sensor (P0116 / P0117 / P0118 or P0125)?
YES
Go to corresponding DTC Flow.
NO
Go to Step 3.

3. Check engine coolant temperature signal circuit for IG short

Turn ignition switch OFF.
Disconnect TCM and ECM connectors from TCM and ECM.
Check proper connection to TCM at terminal "G07-7" and to ECM at terminal "G04-11".
If OK, turn ignition switch ON and measure voltage between terminal "G07-7" of disconnected harness side TCM connector and ground.

Is it 10 - 14 V?
YES
"GRY/BLK" circuit shorted to power circuit.
NO
Go to Step 4.

4. Check engine coolant temperature signal circuit for open

Turn ignition switch OFF.
Check continuity between terminal "G07-7" of disconnected harness side TCM connector and terminal "G04-11" of disconnected harness side ECM connector.

Is continuity indicated?
YES
Go to Step 5.
NO
"GRY/BLK" circuit open.

5. Check engine coolant temperature signal circuit for ground short

Check continuity between terminal "G07-7" of disconnected harness side TCM connector and ground.

Is continuity indicated?
YES
"GRY/BLK" circuit shorted to ground.
NO
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.