Diagnosis Procedure

1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC P0118-00 being past on the CONSULT screen.

Is applicable DTC detected?

YES

Refer to Intermittent Incident .

NO

GO TO 2 .

1. Turn ignition switch OFF.
2. Disconnect coolant temperature sensor connector F127.
3. Inspect the harness and sensor connector pins for the following:
   • Loose connector
   • Corroded pins
   • Bent or broken pins
   • Pushed back or expanded pins
   • Moisture in or on the connector
   • Missing or damaged connector seals
   • Dirt or debris on or in the connector pins
   • Connector shell broken
   • Wire insulation damage
   • Damaged connector locking tab

Is the inspection result normal?

YES

GO TO 3 .

NO

Repair or replace error-detected parts.

1. Coolant temperature sensor connector F127 remains disconnected.
2. Check resistance between the terminals of coolant temperature sensor connector F127.

   Coolant temperature sensor connector F127		Resistance
   Terminal	Terminal
   1	2	180 - 160k Ω

Is the inspection result normal?

YES

GO TO 4 .

NO

Replace the coolant temperature sensor. Refer to Removal and Installation .

1. Connect coolant temperature sensor connector F127.
2. Turn ignition switch ON.
3. Check for DTC P0118-00 being current and P0113 being past on the CONSULT screen after 30 seconds.

Are the applicable DTCs detected?

YES

GO TO 5 .

NO

Refer to Intermittent Incident .

1. Turn ignition switch OFF.
2. Disconnect ECM connector F101.
3. Inspect the harness and module connector pins for the following:
   • Loose connector
   • Corroded pins
   • Bent or broken pins
   • Pushed back or expanded pins
   • Moisture in or on the connector
   • Missing or damaged connector seals
   • Dirt or debris on or in the connector pins
   • Connector shell broken
   • Wire insulation damage
   • Damaged connector locking tab

Is the inspection result normal?

YES

GO TO 6 .

NO

Repair or replace error-detected parts.

1. Connect a jumper wire between terminals 170 and 193 of the ECM connector F101.
2. Turn ignition switch ON.
3. Check for DTC P0117-00 being current and P0118 being past on the CONSULT screen after 30 seconds.

Are the applicable DTCs detected?

YES

GO TO 7 .

NO

Replace the ECM. Refer to Removal and Installation .

1. Turn ignition switch OFF.
2. Remove the jumper wire between terminals 170 and 193 of the ECM connector F101.
3. Disconnect engine coolant temperature sensor connector F127.
4. Check resistance between ECM connector F101 and coolant temperature sensor connector F127.

   ECM		Coolant temperature sensor		Resistance
   Connector	Terminal	Connector	Terminal
   F101	170	F127	1	< 10 Ω

Is the inspection result normal?

YES

GO TO 8 .

NO

An open return circuit has been detected in the engine harness. Repair or replace the engine harness.

Check resistance between ECM connector F101 and engine coolant temperature sensor connector F127.

Is the inspection result normal?

YES

GO TO 9 .

NO

An open signal circuit has been detected in the engine harness. Repair or replace the engine harness.

Check resistance between ECM connector F101 and coolant temperature sensor connector F127.

Is the inspection result normal?

YES

GO TO 10 .

NO

A pin to pin short circuit has been detected on the signal circuit in the engine harness. Repair or replace the engine harness.

1. Connect all components.
2. Turn ignition switch ON.
3. Check for DTC P0118-00 being past on the CONSULT screen after 30 seconds.

Is applicable DTC detected?

YES

Refer to Intermittent Incident .

NO

GO TO 1 .