DTC P0973 / P0974

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
P0973: Shift Solenoid “A” Control Circuit Low Shift solenoid valve “A” drive circuit is shorted to ground. (1 D/C detection logic)	•Shift solenoid valve “A” •Solenoid harness with ATF temperature sensor •TCM
P0974: Shift Solenoid “A” Control Circuit High Shift solenoid valve “A” drive circuit is open or shorted to power supply. (1 D/C detection logic)

Circuit Diagram

[A]:	Solenoid harness connector (View: [a])	1.	TCM	3.	A/T
A1:	Shift solenoid valve “A” drive circuit	2.	CPU	4.	Shift solenoid valve “A”

DTC Confirmation Procedure

NOTE:

Check that the following condition is met in this “DTC Confirmation Procedure”.

•DTC P0602, P0604, P062F or P1702 is not detected.

1)Start engine.

2)Shift select lever from P to M range.

DTC Troubleshooting

Step	Action	Yes	No
1	Was “A/T Control System Check” performed?	Go to Step 2.	Go to A/T Control System Check.
2	Shift solenoid valve “A” and solenoid harness check 1)Check shift solenoid valve “A” and solenoid harness. Is check result OK?	Check for intermittent trouble.	Go to Step 3.
3	Solenoid harness check 1)Remove transaxle side oil pan. 2)Disconnect shift solenoid valve “A” connector. 3)Check for proper terminal connections to solenoid harness connector and shift solenoid valve “A” connector. 4)If connections are OK, check the following points. •Resistance of “A1” circuit: less than 1 Ω •Resistance between “A1” circuit and ground: infinity •Resistance between “A1” circuit terminal and other terminal at solenoid harness connector: infinity •Voltage of “A1” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?	Go to Step 4.	Replace solenoid harness with ATF temperature sensor.
4	Shift solenoid valve “A” check 1)Check shift solenoid valve “A”. Is check result OK?	Substitute a known-good TCM and recheck DTC.	Replace valve body assembly.