DTC P0117 [L8, LF]

id0102b1804000

DTC P0117

ECT sensor circuit low input

DETECTION CONDITION

•  The PCM monitors the ECT sensor signal. If the PCM detects the ECT sensor voltage below 0.2 V, the PCM determines that the ECT sensor circuit has malfunction.

Diagnostic support note

•  This is a continuous monitor (engine cooling system).

•  The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.

•  PENDING CODE is available if the PCM detects the above malfunction condition.

•  FREEZE FRAME DATA (Mode 2/Mode 12) is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Engine overheating (Cooling system malfunction)

•  ECT sensor connector or terminals malfunction

•  ECT sensor malfunction

•  Short to ground in wiring harness between ECT sensor terminal A and PCM terminal 2AH

•  PCM connector or terminals malfunction

•  ECT sensor signal circuit and ground circuit are shorted to each other

•  PCM malfunction

DTC P0117	ECT sensor circuit low input
DETECTION CONDITION	• The PCM monitors the ECT sensor signal. If the PCM detects the ECT sensor voltage below 0.2 V, the PCM determines that the ECT sensor circuit has malfunction. Diagnostic support note • This is a continuous monitor (engine cooling system). • The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Engine overheating (Cooling system malfunction) • ECT sensor connector or terminals malfunction • ECT sensor malfunction • Short to ground in wiring harness between ECT sensor terminal A and PCM terminal 2AH • PCM connector or terminals malfunction • ECT sensor signal circuit and ground circuit are shorted to each other • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY ENGINE CONDITION • Is the engine overheating?	Yes	Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”. (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L8, LF].)
3	VERIFY ENGINE CONDITION • Is the engine overheating?	No	Go to the next step.
4	INSPECT ECT SENSOR CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the ECT sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
4		No	Go to the next step.
5	CLASSIFY ECT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION • Reconnect the ECT sensor connector. • Connect the M-MDS to the DLC-2. • Perform the PID/DATA Monitor and Record Procedure and access the ECT PID. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Verify the ECT value when disconnecting ECT sensor connector. • Does the ECT value change?	Yes	Replace the ECT sensor, then go to Step 9. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [L8, LF].)
5		No	Go to the next step.
6	INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • ECT sensor connector is disconnected. • Inspect for continuity between ECT sensor terminal A (wiring harness-side) and body ground. • Is there continuity?	Yes	If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION [L8, LF].) Go to Step 9.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
7		No	Go to the next step.
8	INSPECT ECT SENSOR SIGNAL AND GROUND CIRCUITS FOR SHORT TO EACH OTHER • ECT sensor and PCM connectors are disconnected. • Inspect for continuity between ECT sensor terminal A and B (wiring harness-side). • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short, then go to the next step.
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
10		No	DTC troubleshooting completed.