3C
Inspection of 4WD Control Module and Its Circuits
4WD control module and its circuits can be checked at 4WD control module wiring couplers by measuring voltage, pulse signal and resistance.
CAUTION:
4WD control module cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to 4WD control module with coupler disconnected from it.
Voltage and Signal Check
1) Check voltage using voltmeter (1) connected to each terminal of coupler.
2) Check signal using oscilloscope (2) connected to each terminal of coupler.
NOTE:
• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition switch is turned ON.
• Pulse signal cannot be measured by voltmeter. It can be measured by oscilloscope.
• Item with asterisk (*) in normal voltage column can be read only by oscilloscope.
4WD control module connector (Viewed from harness side)
[A]: 4WD control module connector (View: [a])
Terminal Wire color Circuit Normal Voltage Condition
E188-1 RED/BLU Transfer shift actuator motor 2 10 – 14 V Ignition switch turned to ON position and transfer shift actuator being rotated when transfer shifted from 4L to 4H or from 4H to 2H
0 – 1 V Ignition switch turned to ON position and transfer shift actuator being rotated when transfer shifted from 2H to 4H or from 4H to 4L
E188-2 RED/WHT Transfer shift actuator motor 1 10 – 14 V Ignition switch turned to ON position and transfer shift actuator being rotated when transfer shifted from 2H to 4H or from 4H to 4L
0 – 1 V Ignition switch turned to ON position and transfer shift actuator being rotated when transfer shifted from 4L to 4H or from 4H to 2H
E188-3 YEL/RED Ignition power supply 10 – 14 V Ignition switch turned to ON position
E188-4 BLU/WHT 4WD low switch 10 – 14 V Ignition switch turned to ON position and transfer shifted to 2H or 4H
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4L
E188-5 BLU/BLK 4WD switch 10 – 14 V Ignition switch turned to ON position and transfer shifted to 2H
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4H or 4L
E188-6 BLU “4WD-L” switch 10 – 14 V Ignition switch turned to ON position and “4WD-L” switch released
0 – 1 V Ignition switch turned to ON position and “4WD-L” switch kept pushed
E188-7 BLU/YEL “4WD” switch 10 – 14 V Ignition switch turned to ON position and “4WD” switch released
0 – 1 V Ignition switch turned to ON position and “4WD” switch kept pushed
E188-8 BLU/BLK “2WD” switch 10 – 14 V Ignition switch turned to ON position and “2WD” switch released
0 – 1 V Ignition switch turned to ON position and “2WD” switch kept pushed
E188-9 — Blank — —
E188-10 BLK Ground 0 – 1 V —
E188-11 GRY/RED VSV2 10 – 14 V Ignition switch turned to ON position and “2WD/4WD” switch not pushed
0 – 1 V Approx. 5 seconds after pushing “4WD” switch or “4WD-L” switch when transfer is at 2H
E188-12 GRY/BLK VSV1 10 – 14 V Ignition switch turned to ON position and “2WD/4WD” switch not pushed
0 – 1 V Approx. 10 seconds after pushing “2WD” switch when transfer is at 4H or 4L
E188-13 YEL/BLK Limit switch 3 10 – 14 V Ignition switch turned to ON position and transfer shifted to 4H or 2H
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4L
E188-14 YEL/RED Limit switch 2 10 – 14 V Ignition switch turned to ON position and transfer shifted to 2H or 4L
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4H
E188-15 YEL Limit switch 1 10 – 14 V Ignition switch turned to ON position and transfer shifted to 4H or 4L
0 – 1 V Ignition switch turned to ON position and transfer shifted to 2H
E188-16 — Blank — —
E188-17 — Blank — —
E188-18 GRN/BLK A/C switch (M13A engine model) 10 – 14 V Ignition switch turned to ON position and A/C switch OFF
0 – 1 V A/C switch ON and blower fan switch ON
E188-19 GRY Vacuum switch 10 – 14 V Ignition switch turned to ON position
0 – 1 V Approx. 5 seconds after pushing “4WD” switch or “4WD-L” switch when transfer is at 2H
E188-20 BLK/YEL Clutch pedal switch (M/T model) 10 – 14 V Ignition switch turned to ON position and clutch pedal released
0 – 1 V Ignition switch turned to ON position and clutch pedal depressed
E188-21 ORN A/T shift switch (“N” range) (A/T model) 10 – 14 V Ignition switch turned to ON position and A/T shifted to “N” range
0 – 1 V Ignition switch turned to ON position and A/T shifted to other than “N” range
E188-22 YEL/GRN Vehicle speed sensor signal *10 – 14 V
↑ ↓
0 – 1 V
(Repeated indicator) 		Vehicle running
E188-23 BRN Engine revolution signal *10 – 14 V
↑ ↓
0 – 1 V
(Refer to Inspection of ECM and Its Circuits:M13A without VVT or Inspection of ECM and Its Circuits:M13A with VVT ) 		engine running
E188-24 RED/BLU 4WD indicator 10 – 14 V Ignition switch turned to ON position and transfer shifted to 2H
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4H or 4L
E188-25 RED/WHT 4WD low indicator 10 – 14 V Ignition switch turned to ON position and transfer shifted to 2H or 4H
0 – 1 V Ignition switch turned to ON position and transfer shifted to 4L
E188-26 GRN/WHT A/C ON signal (M13A engine model) 10 – 14 V Engine running with A/C switch OFF, 5-10 seconds after engine start or 2WD/4WD switch pushed while engine running with A/C ON
0 – 1 V A/C switch and blower fan switch ON