Engine Switch Indicator Circuit: Procedure

Fig 1: Identifying Engine Switch Connector Terminal E18

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E18 engine switch connector.
2. Apply battery voltage to the terminals of the engine switch, and check the illumination condition of the engine switch indicator light.
   NOTE:

   • If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator light will not illuminate.
   • If the voltage is too low, the indicator light will not illuminate.

   OK

   Measurement Condition	Condition	Specified Condition
   Battery terminal (+) → Terminal 11 (SWIL) - Battery terminal (-) → Terminal 5 (GND)	Battery voltage is applied to the terminals	Illuminates
   Battery terminal (+) → Terminal 12 (INDS) - Battery terminal (-) → Terminal 5 (GND)
   Battery terminal (+) → Terminal 13 (INDW) - Battery terminal (-) → Terminal 5 (GND)

NG → See step   3 

OK: Go to next step 

Fig 2: Identifying Main Body ECU Connector Terminal E1 And E18

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E1 main body ECU connector.
2. Disconnect the E18 engine switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E1-25 (SWIL) - E18-11 (SWIL)	Always	Below 1 Ω
   E1-15 (INDS) - E18-12 (INDS)	Always	Below 1 Ω
   E1-14 (INDW) - E18-13 (INDW)	Always	Below 1 Ω
   E18-5 (GND) - Body ground	Always	Below 1 Ω
   E1-25 (SWIL) or E18-11 (SWIL) - Body ground	Always	10 kΩ or higher
   E1-15 (INDS) or E18-12 (INDS) - Body ground	Always	10 kΩ or higher
   E1-14 (INDW) or E18-13 (INDW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)