Terminals Of ECM [09/2024 - ]
WARNING: This page is about a different car, the 2025 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- ECM
HINT:
The standard voltage and resistance of each ECM terminal is shown in the table below.
In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to be inspected. The standard voltage or resistance between the terminals is shown under "Specified Condition".
Use the illustration above as a reference for the ECM terminals.
Terminal No. (Symbol) Terminal Description Condition Specified Condition A139-1 (BATT) - A139-10 (E1) Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V A139-4 (S) - A139-10 (E1) M shift position switch signal Ignition switch ON and shift lever in M 11 to 14 V Ignition switch ON and shift lever not in M Below 1 V A139-8 (CANH) - A139-10 (E1) CAN communication line Ignition switch ON Pulse generation A139-9 (+B) - A139-10 (E1) Power source of ECM Ignition switch ON 11 to 14 V A139-10 (E1) - Body ground Ground Always Below 1 Ω A139-18 (CANL) - A139-10 (E1) CAN communication line Ignition switch ON Pulse generation A139-21 (STP) - A139-10 (E1) Stop light switch signal Brake pedal depressed 7.5 to 14 V Brake pedal released Below 1 V A139-23 (NSW) - A139-10 (E1) A16-15 (NSW) - A16-9 (E1) Ignition switch ON and shift lever in P or N Below 1 V Ignition switch ON and shift lever not in P or N 11 to 14 V A139-25 (CANU) - A139-10 (E1) CAN communication line Ignition switch ON Pulse generation A139-26 (CAND) - A139-10 (E1) CAN communication line Ignition switch ON Pulse generation A139-30 (STA) - A139-10 (E1) Starter signal Cranking (shift lever in P or N, ignition switch ON (START)) 11 to 14 V Ignition switch ON and shift lever in P or N Below 2 V A139-31 (DMS+) - A139-10 (E1) Drive mode select switch (combination switch assembly) signal - Ignition switch ON
- Drive mode select switch (combination switch assembly) pushed forward
Below 1.5 V - Ignition switch ON
- Drive mode select switch (combination switch assembly) in neutral position
11 to 14 V A139-35 (+B2) - A139-10 (E1) Power source of ECM Ignition switch ON 11 to 14 V A139-42 (SPD) - A139-10 (E1) Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph) Pulse generation A139-44 (SFTU) - A139-28 (ECCS) Up-shift switch signal Ignition switch ON 11 to 14 V Ignition switch ON and shift lever held in "+" (Up shift) Below 1 V A139-51 (DMS-) - A139-10 (E1) Drive mode select switch (combination switch assembly) signal - Ignition switch ON
- Drive mode select switch (combination switch assembly) pulled rearward
Below 1.5 V - Ignition switch ON
- Drive mode select switch (combination switch assembly) in neutral position
11 to 14 V A139-52 (SFTD) - A139-28 (ECCS) Down-shift switch signal Ignition switch ON 11 to 14 V Ignition switch ON and shift lever held in "-" (Down shift) Below 1 V C142-42 (D) - A139-10 (E1) D shift position switch signal Ignition switch ON and shift lever in D or M 11 to 14 V Ignition switch ON and shift lever not in D or M Below 1 V C142-43 (N) - A139-10 (E1) N shift position switch signal Ignition switch ON and shift lever in N 11 to 14 V Ignition switch ON and shift lever not in N Below 1 V C142-65 (R) - A139-10 (E1) R shift position switch signal Ignition switch ON and shift lever in R 11 to 14 V Ignition switch ON and shift lever not in R Below 1 V C142-66 (P) - A139-10 (E1) P shift position switch signal Ignition switch ON and shift lever in P 11 to 14 V Ignition switch ON and shift lever not in P Below 1 V C143-1 (SL4+) - C143-2 (SL4-) Solenoid (SL4) valve signal 4th or 6th gear selected Pulse generation C143-3 (SL3+) - C143-4 (SL3-) Solenoid (SL3) valve signal 3rd, 7th or Reverse gear selected Pulse generation C143-5 (SL2+) - C143-6 (SL2-) Solenoid (SL2) valve signal 5th, 6th, 7th or 8th gear selected Pulse generation C143-7 (SL1+) - C143-8 (SL1-) Solenoid (SL1) valve signal 1st, 2nd, 3rd, 4th or 5th gear selected Pulse generation C143-9 (SLU+) - C143-10 (SLU-) Solenoid (SLU) valve signal Lock-up ON Pulse generation C143-11 (SL6+) - C143-12 (SL6-) Solenoid (SL6) valve signal 1st or Reverse gear selected Pulse generation C143-13 (SL5+) - C143-14 (SL5-) Solenoid (SL5) valve signal 2nd or 8th gear selected Pulse generation C143-16 (SLT+) - C143-15 (SLT-) Solenoid (SLT) valve signal Engine idling Pulse generation C143-17 (NCB) - A139-10 (E1) Power source for sensor
(specific voltage)Ignition switch ON 11 to 14 V C143-21 (SL) - A139-10 (E1) Solenoid (SL) valve signal - Shift lever in P, R or N
- Lock-up OFF (shift lever in D)
11 to 14 V C143-27 (NCO) - A139-10 (E1) Transmission Revolution Sensor (NC) signal Vehicle being driven Pulse generation C143-28 (PLKC) - A139-10 (E1) Shift lock release request signal Ignition switch ON, brake pedal depressed 11 to 14 V Ignition switch ON, brake pedal released Below 1.5 V C143-41 (THO1) - C143-50 (ETHO) ATF temperature sensor signal ATF temperature 115°C (239°F) or higher Below 1.5 V C143-53 (NTB) - A139-10 (E1) Power source for sensor
(specific voltage)Ignition switch ON 11 to 14 V C143-54 (NTO) - A139-10 (E1) Transmission Revolution Sensor (NT) signal Engine idling (shift lever in P or N) Pulse generation