P1705

DTC P1705 Engine Coolant Temperature Signal Input:

Throttle Position:

CIRCUIT DESCRIPTION

The Transmission Control Module (TCM) receives an engine coolant temperature signal from the Engine Control Module (ECM). The TCM uses this information to delay Torque Converter Clutch (TCC) operation until the vehicle has reached an operating temperature of 30°C (86°F).


DTC DETECTING CONDITIONS

Following engine coolant temperature signals are detected by the TCM while engine is running:

- 10 Hz (100 ms/cycle) signal being 0% "ON" (10-14 V) for 2.5 seconds.

- 10 Hz (100 ms/cycle) signal being 100% "ON" (about 0 V) after 15 min. from engine start.


ACTION TAKEN

A DTC P1705 is stored, the TCM enters fail-safe mode, and both the "OD/OFF" and "SERVICE ENGINE SOON" indicators are illuminated.

DTC CHART TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. Checks for DTC P0117 or P0118 stored in the ECM and to proceed to their respective diagnostic charts first.

2. Checks for proper voltage values.

3. Checks for poor ECM connector terminal contact.

4. Determines whether the condition is intermittent and not caused by a defective ECM.

5. Checks for a short to ground in PNK/GRN wire.

6. Checks for an open in PNK/GRN wire.

7. Determines whether the condition is intermittent and not caused by a defective TCM.


DIAGNOSTICS AIDS

An intermittent condition may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Inspect the TCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and for poor terminal-to-wire connections.