Postby labsy » Wed Aug 10, 2016 4:18 pm
Just to write down procedure to read Transmission "C" codes manually, without special equipment:
Diagnostic Procedure (A/T models)
1. Warn up engine. Do not turn engine off.
2. Move A/T selector lever to “P” position.
3. Turn 4WD shift switch to “2WD” position.
4. Turn ignition switch “OFF”, then “ON” and “OFF” at least twice, and then turn ignition switch “OFF”. (So actual sequence is OFF, ON, OFF, ON, OFF)
5. Turn 4WD shift switch to “AUTO” position.
6. Turn ignition switch “ON”. (Do not start engine.)
7. 4WD warning lamp ON.
If 4WD warning lamp does not turn ON, refer to TF-148, "4WD Warning Lamp Does Not Turn ON" .
8. Move A/T selector lever to “R” position.
9. Turn 4WD shift switch to “2WD”, “AUTO” and “2WD” in order.
10. Move A/T selector lever to “D” position.
11. Turn 4WD shift switch to “4H”, “AUTO” and “4H” in order.
12. Move A/T selector lever to “N” position.
13. Turn 4WD shift switch to “AUTO” position.
14. Move A/T selector lever to “P” position.
15. Read the flickering of 4WD warning lamp.
The flickering sequence starts by 1 LONG blink, then follow the shorter blinks with longer pause. You will need to either be with a friend in a vehicle for one to read blinks loud and other to write it down, or you will need to read it with eyes focused on paper on steering wheel and counting flickering lamp with peripheral vision.
Fortunatelly flickering repeats once all codes are shown, so you have many options to read them through.
16. If you want to RESET diagnostic codes, then turn ignition switch to OFF after reading codes. If you want them to STAY stored in memory, perform some other action with ignition switch, A/T selector or 2WD mode selector before turning ignition OFF.
WHAT CODES MEAN?
2 Output shaft revolution signal (from TCM)
- Malfunction is detected in output shaft revolution signal that is output from TCM through CAN communication.
- Improper signal is input while driving.
3 Clutch pressure solenoid valve signal
Proper voltage is not applied to clutch pressure solenoid valve due to open or short circuit.
4 2-4WD solenoid valve signal
Proper voltage is not applied to 2-4WD solenoid valve due to open or short circuit.
5 Transfer motor Transfer motor does not operate properly due to open or short circuit in transfer motor or transfer motor relay.
6 Vehicle speed signal (from ABS)
- Malfunction is detected in vehicle speed signal that is output from ABS actuator and electric unit (control unit) through CAN communication.
- Improper signal is input while driving.
7 CAN communication Malfunction has been detected from CAN communication line.
8 AD converter AD converter system of transfer control unit is malfunctioning.
9 Transfer fluid temperature sensor
Signal voltage from transfer fluid temperature sensor is abnormally high (Transfer fluid temperature is abnormally low) while driving.
10 Neutral-4LO switch Improper signal from neutral-4LO switch is input due to open or short circuit.
11 Clutch pressure switch
- Improper signal is input due to open or short circuit.
- Malfunction occurs in clutch pressure switch or hydraulic circuit.
12 Line pressure switch
- Improper signal is input due to open or short circuit.
- Malfunction occurs in line pressure switch or hydraulic circuit.
13 Engine speed signal (from ECM)
- Malfunction is detected in engine speed signal that is output from ECM through CAN communication.
- Improper signal is input while driving.
14 Accelerator pedal position sensor (from ECM)
- Malfunction is detected in accelerator pedal position signal that is output from ECM through CAN communication.
- Signal voltage from accelerator pedal position sensor is abnormally high or low.
15 Power supply Power supply voltage for transfer control unit is abnormally low while driving.
16 4WD shift switch More than two switch inputs are simultaneously detected due to short circuit of 4WD shift switch.
17 ABS operation signal (from ABS)
Malfunction is detected in ABS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.
18 Wait detection switch Improper signal from wait detection switch is input due to open or short circuit.
19 Actuator motor
- Motor does not operate properly due to open or short circuit in actuator motor.
- Malfunction is detected in the actuator motor. (When 4WD shift switch is operated and actuator motor is not operated)
- Malfunction is detected in transfer shift high relay and transfer shift low relay.
20 Actuator position switch
- Improper signal from actuator position switch is input due to open or short circuit.
- Malfunction is detected in the actuator position switch.
21 Actuator circuit
- Transfer control device actuator circuit is shorted or open. (Malfunctions are detected when motor relay circuit is open/shorted or relay transfer shift circuit is open/shorted.)
- Malfunction occurs in transfer control device drive circuit.
Malfunction is detected in transfer shut off relay.
22 ESP operation signal (from ESP)
Malfunction is detected in ESP operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.
23 TCS operation signal (from TCS)
Malfunction is detected in TCS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.
24 PNP switch signal (from TCM)
When A/T PNP switch signal is malfunction or communication error between the vehicles.
Repeats flickering every 2 to 5 sec. — Circuits that the self-diagnosis covers have no malfunction. —
Repeats flickering every 0.25 sec. Data erase display
- Power supply malfunction of memory back-up.
- Battery performance is poor.
No flickering
You might made a mistake in procedure and you are not in diagnostic mode.
For A/T models, PNP switch or 4WD shift switch. PNP switch or 4WD shift switch circuit is shorted or open.
For M/T models, park/neutral position switch, back-up lamp switch or 4WD shift switch. Park/neutral position switch, back-up lamp switch or 4WD shift switch circuit is shorted or open.