Inspection Procedure

HINT:

• If DTCs P0860 and P1646 are output simultaneously, the fail-safe function stops the engine. If the engine is stopped, the transmission control system may be abnormal (See PRE-CHECK ).
• Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

1. Are there DTC P1646 and DTC for SMT being output? 

   PREPARATION: 

   1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
   2. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool main switch ON.
   3. On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

   CHECK: 

   Read DTCs.

   RESULT: 

   DTC OUTPUT RESULT TABLE
   
   

   Display (DTC output)	Proceed To
   P0860	A
   P0860, and P1646 or DTCs for SMT	B

   • B: Go to transmission control system (See  PRE-CHECK  ). 
   • A: Go to next step. 
2. Check transmission control ECU (See  DIAGNOSTIC TROUBLE CODE CHART  ). 
   • NG: Replace transmission control ECU. 
   • OK: Go to next step. 
3. Check harness and connectors between transmission control ECU and ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).