P1738
P1738 SHIFT SYSTEM TIMEOUT
Component Location
General Description
Shift motor is used to change working range of transfer by utilizing Auto/low selection switch. AUTO - LOW Mode : 1,2 terminal B(+) , 16,17 terminal (Ground) LOW - AUTO Mode : 16,17 terminal B(+), 1,2 terminal (Ground) Position encoder provides feedback from the shift motor to the TCCU. 4 switch signals, from encoder, provide information on rotational direction and location of shift motor. The MPS(Motor Position Sensor) receives 5 volts from the TCCU. In cases where the mode switch is changes; the shift motor operates, and MPS contact point creates an ON/OFF signal. When 5 volts is received by the TCCU, it monitors operation of shift motor.
DTC Description
If the shift motor has not reached its destination within 5 seconds, a shift system time out is reported. A resulting corrective action shift is performed.
DTC Detecting Condition
Schematic Diagram
Signal Waveform
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to " Shift Motor Signal Inspection " procedure.
Shift Motor Signal Inspection
1. Engine : Idling.
2. H-14 TRANSFER SOLENOID & MOTOR : Connect.
3. Measure Signal between terminal 6 of TRANSFER SOLENOID & MOTOR connector H-14 and chassis ground.
4. Measure Signal between terminal 7 of TRANSFER SOLENOID & MOTOR connector H-14 and chassis ground.
5. IG KEY ON and change mode switch " AUTO - LOW & LOW - AUTO ".
A. Specification : Signal Waveform
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
6. Is Shift Motor Signal display near the specified value?
YES
1) Fault is intermittent caused by poor contact in the sensor's and/or TCCU's connector or was repaired and TCCU memory was not cleared.Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to " Shift Motor(HI-LOW) harness short circuit to ground inspection " procedure.
Shift Motor(HI-LOW) harness short circuit to ground inspection
1. Ignition OFF.
2. H-14 TRANSFER SOLENOID & MOTOR connector : Disconnect.
3. Measure resistance between terminal 6 of TRANSFER SOLENOID & MOTOR harness connector H-14 and chassis ground .
A. Specification : Approx. Infinite Ohms
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
4. Is resistance display near the specified value?
YES
1) Go to " Shift Motor(HI-LOW) harness open circuit inspection " procedure.
NO
1) Check for short to ground circuit of Shift Motor signal harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Shift Motor(HI-LOW) harness open circuit inspection
1. Ignition OFF.
2. H-14 TRANSFER SOLENOID & MOTOR connector : Disconnect.
3. Measure resistance between terminal 6 of TRANSFER SOLENOID & MOTOR harness connector H-14 and A2 or A7of TCCU harness connector A .
A. Specification : Approx. 0 Ohms
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
4. Is resistance display near the specified value?
YES
1) Go to " Shift Motor(LOW-HI) harness short circuit to ground inspection " procedure.
NO
1) Check for open circuit of Shift Motor signal harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Shift Motor(LOW-HI) harness short circuit to ground inspection
1. Ignition OFF.
2. H-14 TRANSFER SOLENOID & MOTOR connector : Disconnect.
3. Measure resistance between terminal 7 of TRANSFER SOLENOID & MOTOR harness connector H-14 and chassis ground .
A. Specification : Approx. Infinite Ohms
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
4. Is resistance display near the specified value?
YES
1) Go to " Shift Motor(LOW-HI) harness open circuit inspection " procedure.
NO
1) Check for short to ground circuit of Shift Motor signal harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Shift Motor(LOW-HI) harness open circuit inspection
1. Ignition OFF.
2. H-14 TRANSFER SOLENOID & MOTOR connector : Disconnect.
3. Measure resistance between terminal 7 of TRANSFER SOLENOID & MOTOR harness connector H-14 and A1 or A6 of TCCU harness connector A .
A. Specification : Approx. 0 Ohms
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
4. Is resistance display near the specified value?
YES
1) Go to " Position Encoder Signal Inspection " procedure.
NO
1) Check for open circuit of Shift Motor signal harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Position Encoder Signal Inspection
1. Engine : Idling.
2. TCCU connector : Connect.
3. Measure Signal between terminal B5,B15,B16,B18 of TCCU connector B and chassis ground .
4. Measure Signal between terminal B1 of TCCU connector B and chassis ground .
5. Shift to N Range and change mode switch " AUTO - LOW - LOW - AUTO ".
A. Specification : Signal Waveform
CAUTION
The above value is only for reference. The actual value may differ from it according to various engine condition.
6. Is Position Encoder display near the specified value?
YES
1) Go to " Component Inspection " procedure.
NO
1) Check for short to ground circuit of Position Encoder signal harness.
2) Check "Position Encoder" for contamination, deterioration, or damage.
Component Inspection
1. Ignition OFF.
2. H-14 TRANSFER SOLENOID & MOTOR connector : Disconnect.
3. Measure resistance between 6 & 7.
A. Specification : Approx. 0.78 � 0.078 Ohms
CAUTION
The above value is only for reference. The data from vehicle may differ from it according as various vehicle condition. This inspection is for checking open or short of Shift Motor.
4. Is resistance display near the specified value?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
2) Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Check "Shift Motor" for contamination, deterioration, or damage.
2) Substitute with a known-good "Shift Motor" and check for proper operation. If the problem is corrected, replace "Shift Motor" and then go to "Verification of Vehicle Repair" procedure.
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Using scantool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present ?
YES
1) Go to the applicable troubleshooting procedure.
NO
1) System is performing to specification at this time.