AUTOMATIC TRANSMISSION SYSTEM TCM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), the battery voltage is applied to the IGSW of the TCM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the EFI MAIN NO. 1 relay and supplying power to terminal +B of the TCM.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)

   
   
   1. 

      Disconnect the TCM connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition A80-1 (GND) - Body ground Always Below 1 Ω

      Table 1. Text in Illustration

      *a	Rear view of wire harness connector (to TCM)

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

2. Click here

   CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - TCM)

   
   

   1. Disconnect the No. 2 integration relay 1R and 1S connectors.

   2. Disconnect the A80 TCM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 1S-11 - A80-10 (+B) Always Below 1 Ω 1R-8 - A80-21 (IGSW) Always Below 1 Ω 1S-11 or A80-10 (+B) - Body ground Always 10 kΩ or higher 1R-8 or A80-21 (IGSW) - Body ground Always 10 kΩ or higher

   
   
   • OK

     GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR