DTC P0971 [SJ6A-EL]

id050208811700

DTC P0971

Shift solenoid F circuit malfunction (short to power)

DETECTION CONDITION

•  Short circuit in shift solenoid F signal system (while TCM monitors solenoid output voltage, the voltage that differs from the signal output by CPU in TCM is detected).

Diagnostic support note:

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

•  The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle.

•  PENDING CODE is not available.

•  FREEZE FRAME DATA is available.

•  The DTC is stored in the TCM memory.

POSSIBLE CAUSE

•  TCM connector or terminal malfunction

•  Short to power supply in wiring harness between shift solenoid F terminal B and TCM terminal 1Z

•  Short to power supply in wiring harness between shift solenoid F terminal A and TCM terminal 1O

•  Shift solenoid F malfunction

•  TCM malfunction

DTC P0971	Shift solenoid F circuit malfunction (short to power)
DETECTION CONDITION	• Short circuit in shift solenoid F signal system (while TCM monitors solenoid output voltage, the voltage that differs from the signal output by CPU in TCM is detected). Diagnostic support note: • The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle. • The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle. • PENDING CODE is not available. • FREEZE FRAME DATA is available. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE	• TCM connector or terminal malfunction • Short to power supply in wiring harness between shift solenoid F terminal B and TCM terminal 1Z • Short to power supply in wiring harness between shift solenoid F terminal A and TCM terminal 1O • Shift solenoid F malfunction • TCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded on the repair order?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT TCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch to the LOCK position. • Disconnect the TCM connector. • Inspect for poor connection at TCM terminals 1Z and 1O (such as damaged/pulled-out pins, corrosion). • Are terminals normal?	Yes	Go to the next step.
3		No	Repair or replace the connector and/or terminal, then go to Step 7.
4	INSPECT SHIFT SOLENOID F CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (engine off). • Measure the voltage at TCM (wiring harness-side) terminals 1Z and 1O. • Is there 0 V at the TCM wiring harness-side connector terminals?	Yes	Go to go to Step 7.
4		No	Go to the next step.
5	INSPECT SHIFT SOLENOID F CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the LOCK position. • Disconnect the coupler component connector. • Turn the ignition switch to the ON position (engine off). • Measure the voltage at TCM (wiring harness-side) terminals 1Z and 1O. • Is there 0 V at the TCM wiring harness-side connector terminals?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness (TCM—coupler component connector) for short to power supply, then go to Step 7.
6	INSPECT SHIFT SOLENOID F • Inspect the shift solenoid F. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the shift solenoid F normal?	Yes	Repair or replace the wiring harness (coupler component connector—shift solenoid F) for short to power supply, then go to the next step.
6		No	Replace the control valve body, then go to the next step. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
7	VERIFY TROUBLESHOOTING OF DTC P0971 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC using the M-MDS. • Perform the following procedure to ensure that the DTC has been resolved: 1. Start the engine. 2. Warm-up the engine and transmission. 3. Drive the vehicle in D range and make sure that the gears shift smoothly from 1GR to 6GR. • Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)
7		No	Go to the next step.
8	VERIFY NO DTC HAS BEEN PRESENTED • Perform the “Reading DTCs Procedure”. (See AUTOMATIC TRANSMISSION ON-BOARD DIAGNOSTIC FUNCTION [SJ6A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SJ6A-EL].)
8		No	DTC troubleshooting completed.