7B
A/C System Inspection at ECM (M13A Model)
Voltage check
ECM and its circuits can be checked at ECM wiring couplers by measuring voltage.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM with couplers disconnected from ECM.
1) Remove ECM from vehicle by referring to Engine Control Module (ECM) Removal and Installation:M13A .
2) Connect ECM couplers (1) to ECM (2).
3) Check voltage at each terminal of couplers connected.
NOTE:
Because each terminal voltage is affected by the battery voltage, confirm that the battery voltage is 11 V or more when ignition switch is ON.
[A]: Fig. A
[B]: Fig. B
3. E115-2 or E115-3 (engine with VVT)
E117-1 or E117-2 (engine without VVT)
Terminal arrangement of ECM coupler (Viewed from harness side) without VVT
Terminal arrangement of ECM coupler (Viewed from harness side) with VVT
ECM Voltage Values Table for Relation of A/C Control
NOTE:
Upper terminal number is for engine without VVT.
Lower terminal number is for engine with VVT.
Terminal Wire
color 		Circuit Measurement ground Normal value Condition
E114-1
(E117-11) 		PNK/BLU Compressor magnet clutch output Ground to engine (Fig B) 0 – 1 V Blower fan motor switch and A/C switch ON with engine running
11 – 15 V Except the above-mentioned condition with engine running
E114-16
(E118-30) 		GRN/WHT A/C switch input Ground to engine (Fig B) 11 – 15 V Blower fan motor switch or A/C switch OFF with engine running
0 – 1 V Blower fan motor switch and A/C switch ON with engine running
11 – 15 V Within several seconds after operate transfer lever between 2WD and 4WD with above condition
E114-18
(E117-12) 		PNK/BLK Condenser cooling fan relay output Ground to engine (Fig B) 0 – 1 V Blower fan motor switch and A/C switch ON or engine coolant temperature at more than 110 °C (230 °F) with engine running.
12 – 15 V Except the above-mentioned condition with engine running
E113-14
(E118-35) 		BLK/BLU Sensor ground for A/C evaporator Ground to body (Fig A) –0.5 – 1 V Engine running
E113-13
(E118-13) 		BLU/ORN Blower fan speed input Ground to engine (Fig B) 0 – 1 V Blower fan motor switch 3rd or 4th with engine running
4 – 8 V Blower fan motor switch 1st or 2nd with engine running
12 – 15 V Blower fan motor switch and A/C switch OFF with engine running
E115-1
(E119-1) 		BLK Main ground for ECM Ground to engine (Fig A) –0.5 – 1 V Engine running
E115-2
(E117-1) 		BLK/RED ECM ground for power circuit Ground to engine (Fig A) –0.5 – 1 V Engine running
E115-3
(E117-2) 		BLK/RED ECM ground for power circuit Ground to engine (Fig A) –0.5 – 1 V Engine running
E115-10
(E119-28) 		BLK/BLU Sensor ground for ECT sensor Ground to body (Fig A) –0.5 – 1 V Engine running
E115-14
(E119-16) 		GRN/BLK ECT sensor input Ground to engine (Fig B) 0.73 – 0.83 V
(315 – 355 Ω) 		Engine coolant temperature at approximately 80 °C (176 °F) with engine running
0.35 – 0.45 V
(145 – 165 Ω) 		Engine coolant temperature at approximately 110 °C (230 °F) with engine running
*If the temperature is more than 113 °C (235 °F), compressor should be stop (come back at less than 111 °C (232 °F)
E113-1
(E118-15) 		WHT/RED A/C evaporator thermistor temperature input Ground to engine (Fig B) 2.0 – 2.3 V
(1800 – 2200 Ω) 		Evaporator thermistor temperature at approximately 25 °C (77 °F) with engine running
3.5 – 3.6 V
(6300 – 7000 Ω) 		Evaporator thermistor temperature at approximately 0 °C (32 °F) with engine running
*If the temperature is less than approximately 2.5 °C (36.5 °F), compressor cooling fan should be stop (come back at less than approximately 4 °C (39.2 °F)