DTC P0979:00 [TCM (SJ6A-EL)]

id0502o1826400

DTC P0979:00

Shift solenoid C signal: Short circuit

DETECTION CONDITION

•  Vehicle condition: Shift solenoid C ON signal is output while TCM is normal with engine running

•  Status: Detects short to ground in shift solenoid C signal system

•  Period: Confirmed 1 time in 0.5 s or more

FAIL-SAFE FUNCTION

•  Inhibits learning control.

•  Inhibits the manual shift control.

•  Inhibits direct mode.

•  Inhibits AAS mode.

•  Inhibits the TCC control and slip control.

•  Inhibits 5GR and 6GR.

•  Inhibits the neutral control.

•  Inhibits the i-stop control.

•  Sets to emergency mode.

POSSIBLE CAUSE

•  TCM connector or terminal malfunction

•  Coupler component connector or terminal malfunction

•  Shift solenoid C connector or terminal malfunction

•  Short to ground in wiring harness between shift solenoid C terminal A and TCM terminal 2AA

•  Shift solenoid C malfunction

•  TCM malfunction

DTC P0979:00	Shift solenoid C signal: Short circuit
DETECTION CONDITION	• Vehicle condition: Shift solenoid C ON signal is output while TCM is normal with engine running • Status: Detects short to ground in shift solenoid C signal system • Period: Confirmed 1 time in 0.5 s or more
FAIL-SAFE FUNCTION	• Inhibits learning control. • Inhibits the manual shift control. • Inhibits direct mode. • Inhibits AAS mode. • Inhibits the TCC control and slip control. • Inhibits 5GR and 6GR. • Inhibits the neutral control. • Inhibits the i-stop control. • Sets to emergency mode.
POSSIBLE CAUSE	• TCM connector or terminal malfunction • Coupler component connector or terminal malfunction • Shift solenoid C connector or terminal malfunction • Short to ground in wiring harness between shift solenoid C terminal A and TCM terminal 2AA • Shift solenoid C malfunction • TCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture of the PC function. • Record the freeze frame data/snapshot data.	—	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	INSPECT TCM CONNECTOR FOR POOR CONNECTION • Switch the ignition off. • Disconnect the TCM connector. • Inspect for poor connection at TCM terminal 2AA (such as damaged/pulled-out pins, corrosion). • Is terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the connector and/or terminal, then go to Step 9.
4	INSPECT RESISTANCE OF SHIFT SOLENOID C CIRCUIT • Inspect for resistance between TCM terminal 2AA (wiring harness-side) and body ground. • Is the resistance within 11—15 ohms?	Yes	Go to Step 9.
4		No	Go to the next step.
5	INSPECT COUPLER COMPONENT CONNECTOR FOR POOR CONNECTION • Switch the ignition off. • Disconnect the coupler component connector. • Inspect for poor connection at coupler component terminal M (such as damaged/pulled-out pins, corrosion). • Is terminal normal?	Yes	Go to the next step.
5		No	Repair or replace the connector and/or terminal, then go to Step 9.
6	INSPECT RESISTANCE OF SHIFT SOLENOID C CIRCUIT • Inspect the resistance between coupler component (transmission case side) terminal M and body ground. • Is the resistance within 11—15 ohms? (See SOLENOID VALVE INSPECTION [SJ6A-EL].)	Yes	Repair or replace the wiring harness (TCM—coupler component connector) for short to ground, then go to Step 9.
6		No	Go to the next step.
7	INSPECT SHIFT SOLENOID C CONNECTOR FOR POOR CONNECTION • Switch the ignition off. • Disconnect the shift solenoid C connector. • Inspect for poor connection at shift solenoid C terminal A (such as damaged/pulled-out pins, corrosion). • Is terminal normal?	Yes	Go to the next step.
7		No	Repair or replace the connector and/or terminal, then go to Step 9.
8	INSPECT SHIFT SOLENOID C • Inspect the shift solenoid C. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the shift solenoid C normal?	Yes	Repair or replace the wiring harness (coupler component connector—shift solenoid C) for short to ground, then go to the next step.
8		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].)
9	VERIFY SAME DTC IS NOT PRESENT • Always reconnect all disconnected connectors. • Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) • 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 position and make sure that the gears shift smoothly from 1GR to 6GR. • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) • Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)
9		No	Go to the next step.
10	VERIFY DTC TROUBLESHOOTING COMPLETED • Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
10		No	DTC troubleshooting completed.