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Transfer: Diagnosis Suzuki Equator I

Transfer Case 98 illustrations ~6807 words

How to Erase DTC Check Results

  1. Perform applicable inspection of malfunctioning item and then repair or replace.
  2. Start engine and select "DTC check" mode for "4WD" with SDT.
  3. Touch "Clear" on SDT screen to erase DTC memory. CAUTION: If memory cannot be erased, perform applicable diagnosis.

Diagnostic Procedure (A/T models)

  1. Warm up engine.
  2. Turn ignition switch "ON" and "OFF" at least twice, and then turn ignition switch "OFF".
  3. Move A/T selector lever to "P" position.
  4. Turn 4WD shift switch to "2WD" position.
  5. Turn ignition switch "ON". (Do not start engine.)
  6. 4WD warning lamp should turn ON. If 4WD warning lamp does not turn ON, refer to [ «4WD WARNING LAMP DOES NOT TURN ON»(ref-375706-S04336088202010102800000) ].
  7. Move A/T selector lever to "R" position.
  8. Turn 4WD shift switch to "2WD", "4H" and "2WD" in order.
  9. Move A/T selector lever to "P" position.
  10. Turn 4WD shift switch to "4H", "2WD" and "4H" in order.
  11. Move A/T selector lever to "N" position.
  12. Turn 4WD shift switch to "2WD" position.
  13. Move A/T selector lever to "P" position.
  14. Read the flickering of 4WD warning lamp. Refer to " «JUDGEMENT SELF-DIAGNOSIS»(ref-375705-S19941921902010102800000) ".

Diagnostic Procedure (M/T models)

  1. Warm up engine.
  2. Turn ignition switch "ON" and "OFF" at least twice, and then turn ignition switch "OFF".
  3. Move M/T shift lever to neutral position.
  4. Turn 4WD shift switch to "2WD" position.
  5. Turn ignition switch "ON". (Do not start engine.)
  6. 4WD warning lamp should turn ON. If 4WD warning lamp does not turn ON, refer to [ «4WD WARNING LAMP DOES NOT TURN ON»(ref-375706-S04336088202010102800000) ].
  7. Move M/T shift lever to any position other than neutral.
  8. Turn 4WD shift switch to "2WD", "4H" and "2WD" in order.
  9. Move M/T shift lever to neutral position.
  10. Turn 4WD shift switch to "4H", "2WD" and "4H" in order.
  11. Move M/T shift lever to any position other than neutral.
  12. Turn 4WD shift switch to "2WD" position.
  13. Move M/T shift lever to neutral position.
  14. Read the flickering of 4WD warning lamp. Refer to " «JUDGEMENT SELF-DIAGNOSIS»(ref-375705-S19941921902010102800000) ".

Scheme 7

Scheme 7: Self-diagnosis example
Scheme 7: Self-diagnosis example

NVH Troubleshooting Chart

Use the chart below to help you find the cause of the symptom. The numbers indicate the order of the inspection. If necessary, repair or replace these parts.

SUSPECTED PARTS (Possible cause)[A][B][C][D][E][F][G][H][I]
SymptomNoise1233
Transfer fluid leakage31222
Hard to shift or will not shift112
[A]: TRANSFER FLUID (Level low) [B]: TRANSFER FLUID (Wrong) [C]: TRANSFER FLUID (Level too high) [D]: LIQUID GASKET (Damaged) [E]: O-RING (Worn or damaged) [F]: OIL SEAL (Worn or damaged) [G]: SHIFT FORK (Worn or damaged) [H]: GEAR (Worn or damaged) [I]: BEARING (Worn or damaged)

NVH TROUBLESHOOTING CHART

DTC CHART

DTCSDTDiagnostic item is detected when...Reference
[P1801]*INITIAL START*Due to removal of battery which cuts off power supply to transfer control unit, self-diagnosis memory function is suspended.
[P1802]CONTROL UNIT (1,2,3)Malfunction is detected in the memory (RAM) system of transfer control unit.
[P1803]Malfunction is detected in the memory (ROM) system of transfer control unit.
[P1804]Malfunction is detected in the memory (EEPROM) system of transfer control unit.
[P1807]VHCL SPEED SEN.ATMalfunction is detected in output shaft revolution signal that is output from TCM through CAN communication. Improper signal is input while driving.
[P1808]VHCL SPEED SEN.ABSMalfunction 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.
[P1809]CONTROL UNIT 4AD converter system of transfer control unit is malfunctioning.
[P1810]4L POSI SW TFImproper signal from 4LO switch is input due to open or short circuit.
[P1811]BATTERY VOLTAGEPower supply voltage for transfer control unit is abnormally low while driving.
[P1813]4WD MODE SWMore than two switch inputs are simultaneously detected due to short circuit of 4WD shift switch.
[P1814]4WD DETECT SWITCHImproper signal from wait detection switch is input due to open or short circuit.
[P1816]PNP SW/CIRCWhen PNP switch signal is malfunctioning.(A/T models), (M/T models)
[P1817]SHIFT ACTUATORMotor 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 or transfer shift low relay.
[P1818]SHIFT ACT POSI SWImproper signal from actuator position switch is input due to open or short circuit. Malfunction is detected in actuator position switch.
[P1819]SHIFT ACT CIRMalfunction is detected in transfer shut off relay 1 and transfer shut off relay 2. Malfunction occurs in transfer control device drive circuit.
[P1820]ENGINE SPEED SIGMalfunction is detected in engine speed signal that is output from ECM through CAN communication. Improper signal is input while driving.

DTC CHART

Note. If "SHIFT ACT POSI SW [P1818]" or "SHIFT ACT CIR [P1819]" is displayed, first erase DTC. ("SHIFT ACT POSI SW [P1818]" or "SHIFT ACT CIR [P1819]" may be displayed after installing transfer control unit or transfer assembly.)

DTC DETECTION LOGIC

DTCSDTDiagnostic item is detected when...
[P1801]*INITIAL START*Due to removal of battery which cuts off power supply to transfer control unit, self-diagnosis memory function is suspended.
[P1811]BATTERY VOLTAGEPower supply voltage for transfer control unit is abnormally low while driving.

DTC DETECTION LOGIC CHART

DTC CONFIRMATION PROCEDURE

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Are DTC's "P1801 or P1811 detected?Perform diagnosis procedure. Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ].Inspection End.

DIAGNOSIS PROCEDURE

Diagnosis Procedure

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK POWER SUPPLY Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Check voltage between transfer control unit harness connector terminals and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between transfer control unit harness connector terminals and ground. Is there voltage? GO TO 2. Check the following. If any items are damaged, repair or replace damaged parts. 40A fuse (No. J , located in the fuse and fusible link box). 10A fuses (No. 21, located in the fuse block (J/B) and Nos. 57 and 58 located in the fuse and relay box). Harness for short or open between battery and transfer control unit harness connector M152 terminal 19. Harness for short or open between battery and transfer shut off relay 2 harness connector E157 terminal 1 and 3. Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3. Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal 25. Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1. Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 5 and transfer control unit harness connector M153 terminals 44, 45. Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 5 and transfer control unit harness connector M153 terminals 44, 45. Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M153 terminal 40. Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and ground. Battery and ignition switch. Transfer shut off relay 1, 2. Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. 2 CHECK GROUND CIRCUIT Turn ignition switch "OFF". Disconnect transfer control unit harness connector. Check continuity between transfer control unit harness connector M152 terminals 6 (M/T models) and 18, and M153 terminal 32 and ground. Continuity should exist. Also check harness for short to power. Do you have continuity? GO TO 3. Repair open circuit or short to power in harness or connectors. 3 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 4. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 4 CHECK DTC Drive vehicle and then perform "DTC check". Do DTC's P1801 or P1811 display? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End

Scheme 8

Scheme 8: Diagnosis Procedure
Scheme 8: Diagnosis Procedure

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Scheme 13: Component Inspection
Scheme 13: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Remove transfer shut off relay 1 and transfer shut off relay 2. Refer to [ «P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT»(ref-375706-S14873322802010102800000) ].
  3. Apply 12V direct current between transfer shut off relay terminals 1 and 2.
  4. Check continuity between relay terminals 3 and 5. CONTINUITY CHART Condition Continuity 12V direct current supply between terminals 1 and 2 Yes OFF No
  5. If inspection results are not normal, replace the transfer shut off relay 1 or 2.
DTCSDTDiagnostic item is detected when...
[P1802]CONTROL UNIT 1Malfunction is detected in the memory (RAM) system of transfer control unit.
[P1803]CONTROL UNIT 2Malfunction is detected in the memory (ROM) system of transfer control unit.
[P1804]CONTROL UNIT 3Malfunction is detected in the memory (EEPROM) system of transfer control unit.
[P1809]CONTROL UNIT 4AD converter system of transfer control unit is malfunctioning.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Are DTC's "P1802 - P1804 or P1809 detected?Perform diagnosis procedure. Refer to [ P1802 - P1804, P1809 TRANSFER CONTROL UNIT ].Inspection End.

DIAGNOSIS PROCEDURE

StepActionYESNO
1INSPECTION START Do you have SDT? YES or NOGO TO 2.GO TO 3.
2PERFORM DTC CHECK (WITH SDT) Turn ignition switch "ON". Select "DTC check" mode for "4WD" with SDT. Touch "Clear". Turn ignition switch "OFF" and wait at least 10 seconds. Perform "DTC check" again. Is the "CONTROL UNIT 1 [P1802]", "CONTROL UNIT 2 [P1803]", "CONTROL UNIT 3 [P1804]" or "CONTROL UNIT 4 [P1809]" displayed?Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ].Inspection End.
3PERFORM SELF-DIAGNOSIS (WITHOUT SDT) Perform the self-diagnosis and then erase DTC. Refer to [ SDT FUNCTION (4WD) ]. Perform the self-diagnosis again. Do the self-diagnosis results indicate AD converter?Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ].Inspection End.

DIAGNOSIS PROCEDURE

DTCSDTDiagnostic item is detected when...
[P1807]VHCL SPEED SEN.ATMalfunction is detected in output shaft revolution signal that is output from TCM through CAN communication. Improper signal is input while driving.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1807 detected?Perform diagnosis procedure. Refer to [ P1807 VEHICLE SPEED SENSOR (A/T) ].Inspection End.

DIAGNOSIS PROCEDURE

StepActionYESNO
1CHECK DTC WITH TCM Perform "DTC check" with TCM. Refer to [ SDT FUNCTION (4WD) ]. Is any malfunction detected by "DTC check"?Check the malfunctioning system.GO TO 2.
2CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?GO TO 3.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3CHECK DTC Drive vehicle and then perform "DTC check". Is DTC P1807 displayed?Perform "DTC check" with TCM again.Inspection End.

DIAGNOSIS PROCEDURE

DTCSDTDiagnostic item is detected when...
[P1808]VHCL SPEED SEN.ABSMalfunction 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.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC "P1808 displayed?Perform diagnosis procedure. Refer to [ P1808 VEHICLE SPEED SENSOR (ABS) ].Inspection End.

DIAGNOSIS PROCEDURE

StepActionYESNO
1CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) Perform "DTC check" with ABS actuator and electric unit (control unit) for specific BRC system type. Is any malfunction detected by "DTC check"?Check the malfunctioning system.GO TO 2.
2CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?GO TO 3.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3CHECK DTC Drive vehicle and then perform "DTC check". Is DTC P1808 displayed?Perform "DTC check" with ABS actuator and electric unit (control unit) for specific BRC system type.Inspection End.

DIAGNOSIS PROCEDURE

DTCSDTDiagnostic item is detected when...
[P1810]4L POSI SW TFImproper signal from 4LO switch is input due to open or short circuit.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1810 displayed?Perform diagnosis procedure. Refer to [ P1810 4 LO SWITCH ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK 4LO POSITION SWITCH SIGNAL With SDT Start engine. Select "Data list" mode for "4WD" with SDT. Read out the value of "4L POSI SW". 2) Without SDT Start engine. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 5. GO TO 2. 2 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND 4LO SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the 4LO switch harness connector. Check continuity between transfer control unit harness connector M152 terminal 24 and 4LO switch harness connector F60 terminal 13. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 3. Repair or replace damaged parts. 3 CHECK GROUND CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect 4LO switch harness connector. Check continuity between 4LO switch harness connector F60 terminal 12 and ground. Continuity should exist. Also check harness for short to power. Is there continuity? GO TO 4. Repair open circuit or short to power in harness or connectors. 4 CHECK 4LO SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect 4LO switch harness connector. Remove 4LO switch. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Push and release 4LO switch and check continuity between 4LO switch terminals 12 and 13. Are the inspection results normal? GO TO 5. Replace 4LO switch. 5 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 6. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 6 CHECK DTC Drive the vehicle and then perform "DTC check". Is DTC P1810 displayed? Replace transfer control unit. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Inspection End

Scheme 14

Scheme 14: Diagnosis Procedure
Scheme 14: Diagnosis Procedure

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Scheme 21

Scheme 21: Component Inspection
Scheme 21: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect 4LO switch harness connector.
  3. Remove 4LO switch. Refer to [ «4WD SYSTEM: COMPONENT PARTS LOCATION»(ref-375706-S41262033902010102800000) ].
  4. Push and release 4LO switch and check continuity between 4LO switch terminals 12 and 13. TERMINAL CONTINUITY CHART Terminal Condition Continuity 12 - 13 Push 4LO switch Yes Release 4LO switch No
  5. If the inspection results are not normal replace the 4LO switch.
DTCSDTDiagnostic item is detected when...
[P1813]4WD MODE SWMore than two switch inputs are simultaneously detected due to short circuit of 4WD shift switch.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1813 displayed?Perform diagnosis procedure. Refer to [ P1813 4WD SHIFT SWITCH ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK 4WD SHIFT SWITCH SIGNAL With SDT Turn ignition switch "ON". Select "Data list" mode for "4WD" with SDT. Read out ON/OFF switching action of the "2WD SWITCH", "4H SWITCH", "4L SWITCH" with operating 4WD shift switch. Without SDT Turn ignition switch "ON". Check voltage between transfer control unit harness connector terminals and ground. Are the inspection results normal? GO TO 5. GO TO 2. 2 CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect 4WD shift switch harness connector. Check voltage between 4WD shift switch harness connector terminal 1 and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between 4WD shift switch harness connector terminal 1 and ground. Is there voltage? GO TO 3. Check harness for short or open between 4WD shift switch harness connector terminal 1 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 58 located in the fuse and relay box). If any items are damaged, repair or replace damaged parts. Perform trouble diagnosis for power supply circuit. Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. 3 CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the 4WD shift switch harness connector. Check continuity between the following terminals. Transfer control unit harness connector M152 terminal 14 and 4WD shift switch harness connector M141 terminal 3. Transfer control unit harness connector M152 terminal 15 and 4WD shift switch harness connector M141 terminal 5. Transfer control unit harness connector M152 terminal 16 and 4WD shift switch harness connector M141 terminal 6. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 4. Repair or replace damaged parts. 4 CHECK 4WD SHIFT SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove 4WD shift switch harness connector. Operate 4WD shift switch and check continuity between 4WD shift switch terminals. Are the inspection results normal? GO TO 5. Replace 4WD shift switch. 5 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 6. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 6 CHECK DTC Drive the vehicle and then perform "DTC check". Is DTC P1813 displayed? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End

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Scheme 22: Diagnosis Procedure
Scheme 22: Diagnosis Procedure

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Scheme 31

Scheme 31: Component Inspection
Scheme 31: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Remove 4WD shift switch harness connector.
  3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals. TERMINAL CONTINUITY CHART Terminal Condition Continuity 1 - 3 4WD shift switch: 2WD Yes 4WD shift switch: 4H and 4LO No 1 - 5 4WD shift switch: 4H Yes 4WD shift switch: 2WD and 4LO No 1 - 6 4WD shift switch: 4LO Yes 4WD shift switch: 2WD and 4H No
  4. If the inspection results are abnormal replace the 4WD shift switch.
DTCSDTDiagnostic item is detected when...
[P1814]4WD DETECT SWITCHImproper signal from wait detection switch is input due to open or short circuit.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1814 detected?Perform diagnosis procedure. Refer to [ P1814 WAIT DETECTION SWITCH ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK WAIT DETECTION SWITCH SIGNAL With SDT Start engine. Select "Data list" mode for "4WD" with SDT. Read out the value of "WAIT DETCT SW". 2) Without SDT Start engine. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 5. GO TO 2. 2 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND WAIT DETECTION SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the wait detection switch harness connector. Check continuity between transfer control unit harness connector M152 terminal 17 and wait detection switch harness connector F59 terminal 10. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 3. Repair or replace damaged parts. 3 CHECK GROUND CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect wait detection switch harness connector. Check continuity between wait detection switch harness connector F59 terminal 11 and ground. Continuity should exist. Also check harness for short to power. Is there continuity? GO TO 4. Repair open circuit or short to power in harness or connectors. 4 CHECK WAIT DETECTION SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect wait detection switch harness connector. Remove wait detection switch. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11. Are the inspection results normal? GO TO 5. Replace wait detection switch. 5 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 6. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 6 CHECK DTC Drive the vehicle and then perform "DTC check". Is DTC P1814 displayed? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End

Scheme 32

Scheme 32: Diagnosis Procedure
Scheme 32: Diagnosis Procedure

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Scheme 39

Scheme 39: Component Inspection
Scheme 39: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect wait detection switch harness connector.
  3. Remove wait detection switch. Refer to [ «4WD SYSTEM: COMPONENT PARTS LOCATION»(ref-375706-S41262033902010102800000) ].
  4. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11. TERMINAL CONTINUITY CHART Terminal Condition Continuity 10 - 11 Push wait detection switch Yes Release wait detection switch No
  5. If the inspection results are abnormal replace the wait detection switch.
DTCSDTDiagnostic item is detected when...
[P1816]PNP SW/CIRCWhen A/T PNP switch signal is malfunction or communication error between the vehicles.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1816 displayed?Perform diagnosis procedure. Refer to [ P1816 PNP SWITCH (A/T) ].Inspection End.

DIAGNOSIS PROCEDURE

StepActionYESNO
1CHECK DTC WITH TCM Perform "DTC check" with TCM. Refer to [ SDT FUNCTION (4WD) ]. Is any malfunction detected by "DTC check"?Check the malfunctioning system.GO TO 2.
2CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Is the inspection result normal?GO TO 3.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3CHECK DTC Drive the vehicle and then perform "DTC check". Is DTC P1816 displayed?Perform "DTC check" with TCM again.Inspection End.

DIAGNOSIS PROCEDURE

DTCSDTDiagnostic item is detected when...
[P1816]PNP SW/CIRCWhen M/T PNP switch signal is malfunction.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1816 displayed?Perform diagnosis procedure. Refer to [ P1816 PNP SWITCH (M/T) ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK PARK/NEUTRAL POSITION SWITCH SIGNAL Turn ignition switch ON. Check voltage between transfer control unit harness connector M152 terminal 33 and ground. Is the inspection result normal? GO TO 5. GO TO 2. 2 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND PARK/NEUTRAL POSITION SWITCH Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the park/neutral position switch harness connector. Check continuity between transfer control unit harness connector M152 terminal 33 and park/neutral position switch harness connector F66 terminal 1. Continuity should exist. Also check harness for short to ground and short to power. Is the inspection result normal? GO TO 3. Repair or replace damaged parts. 3 CHECK GROUND CIRCUIT Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect park/neutral position switch harness connector. Check continuity between park/neutral position switch harness connector F66 terminal 2 and ground. Continuity should exist. Also check harness for short to power. Is the inspection result normal? GO TO 4. Repair open circuit or short to power in harness or connectors. 4 CHECK PARK/NEUTRAL POSITION SWITCH Turn ignition switch OFF. (Stay for at least 5 seconds.) Remove park/neutral position switch. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Push and release park/neutral position switch and check continuity between park/neutral position switch terminals 1 and 2. Is the inspection result normal? GO TO 5. Replace park/neutral position switch. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. 5 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Is the inspection result normal? Inspection End. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts

Scheme 40

Scheme 40: Diagnosis Procedure
Scheme 40: Diagnosis Procedure

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Scheme 46: Component Inspection
Scheme 46: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect neutral position switch harness connector.
  3. Remove neutral position switch. Refer to [ «4WD SYSTEM: COMPONENT PARTS LOCATION»(ref-375706-S41262033902010102800000) ].
  4. Push and release neutral position switch and check continuity between neutral position switch terminals 1 and 2. TERMINAL CONTINUITY CHART Terminal Condition Continuity 1 - 2 Push neutral position switch Yes Release neutral position switch No
  5. If NG, replace the neutral position switch.
DTCSDTDiagnostic item is detected when...
[P1817]SHIFT ACTUATORMotor 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 or transfer shift low relay.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1817 detected?Perform diagnosis procedure. Refer to [ P1817 ACTUATOR MOTOR ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK ACTUATOR MOTOR SIGNAL With SDT Start engine. Select "Data list" mode for "4WD" with SDT. Read out the value of "SHIFT ACT1", "SHIFT AC MON1", "SHIFT ACT2", "SHIFT AC MON2". 2) Without SDT Start engine. Depress brake pedal and stop vehicle. Set A/T selector lever to "N" position. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 9. GO TO 2. 2 CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Check voltage between transfer control unit harness connector terminal 27 and ground. 4. Turn ignition switch "ON". 5. Check voltage between transfer control unit harness connector terminal 27 and ground. Are the inspection results normal? GO TO 3. Check harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 57, located in the fuse and relay block). If any items are damaged, repair or replace damaged parts. Perform trouble diagnosis for power supply circuit. Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. 3 CHECK TRANSFER RELAY POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove transfer shift high relay and transfer shift low relay. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Check voltage between transfer control unit harness connector terminal and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 4. Check the following. If any items are damaged, repair or replace damaged parts. Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift high relay harness connector E46 terminal 2. Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift low relay harness connector terminal E47 terminal 2. 4 CHECK TRANSFER RELAY Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove transfer shift high relay and transfer shift low relay. Apply 12V direct current between transfer shift high and low relay terminals 1 and 2. 4. Check continuity between relay terminals 3 and 4, 3 and 5. Are the inspection results normal? GO TO 5. Replace the transfer shift high or low relay. 5 CHECK (1): HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Remove transfer shift high relay and transfer shift low relay. Check continuity between the following terminals. Transfer control unit harness connector M153 terminal 42 and transfer shift high relay harness connector E46 terminal 1. Transfer control unit harness connector M153 terminal 50 and transfer shift low relay harness connector E47 terminal 1. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 6. Repair or replace damaged parts. 6 CHECK (2): HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Remove transfer shift high relay and transfer shift low relay. Check continuity between the following terminals. Transfer control unit harness connector M153 terminal 28 and transfer shift high relay harness connector E46 terminal 5. Transfer control unit harness connector M153 terminal 28 and transfer shift low relay harness connector E47 terminal 5. Transfer control unit harness connector M153 terminal 31 and transfer shift high relay harness connector E46 terminal 4. Transfer control unit harness connector M153 terminal 31 and transfer shift low relay harness connector E47 terminal 4. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 7. Repair or replace damaged parts. 7 CHECK ACTUATOR MOTOR OPERATION CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the transfer control device (actuator motor) harness connector. Check continuity between the following terminals. Transfer control unit harness connector M153 terminal 47 and transfer control device (actuator motor) harness connector F58 terminal 23. Transfer control unit harness connector M153 terminal 48 and transfer control device (actuator motor) harness connector F58 terminal 24. Transfer control device (actuator motor) harness connector F58 terminal 24 and transfer shift high relay harness connector E46 terminal 3. Transfer control device (actuator motor) harness connector F58 terminal 23 and transfer shift low relay harness connector E47 terminal 3. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 8. Repair or replace damaged parts. 8 CHECK ACTUATOR MOTOR Remove transfer control device. Refer to [ TRANSFER CONTROL DEVICE: REMOVAL AND INSTALLATION ]. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 23 and 24. CAUTION: Be careful not to overheat the harness. Does actuator motor rotate? GO TO 9. Replace transfer control device (actuator motor). 9 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 10. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 10 CHECK DTC Perform "DTC check", after driving a vehicle for a while. Is DTC P1817 displayed? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End

Scheme 47

Scheme 47: Diagnosis Procedure
Scheme 47: Diagnosis Procedure

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Scheme 66

Scheme 66: ACUTATOR MOTOR
Scheme 66: ACUTATOR MOTOR
  1. Remove transfer control device. Refer to [ «TRANSFER CONTROL DEVICE: REMOVAL AND INSTALLATION»(ref-375706-S01403729122010102800000) ].
  2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 23 and 24. CAUTION: Be careful not to overheat the harness. TERMINAL ACTUATOR MOTOR CHART Terminal Actuator motor 24 (Battery voltage) - 23 (Ground) Clockwise rotate 23 (Battery voltage) - 24 (Ground) Counterclockwise rotate
  3. If the inspection results are abnormal replace the transfer control device (actuator motor).

Scheme 67

Scheme 67: TRANSFER RELAY
Scheme 67: TRANSFER RELAY
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Remove transfer shift high relay and transfer shift low relay 2. Refer to [ «4WD SYSTEM: COMPONENT PARTS LOCATION»(ref-375706-S41262033902010102800000) ].
  3. Apply 12V direct current between transfer shift high and low relay terminals 1 and 2.
  4. Check continuity between relay terminals 3 and 4, and 3 and 5. TERMINAL CONTINUITY CHART Terminal Condition Continuity 3 - 4 12V direct current supply between terminals 1 and 2 No OFF Yes 3 - 5 12V direct current supply between terminals 1 and 2 Yes OFF No
  5. If the inspection results are abnormal replace the transfer shift high or low relay.
DTCSDTDiagnostic item is detected when...Reference
[P1818]SHIFT ACT POSI SWImproper signal from actuator position switch is input due to open or short circuit. Malfunction is detected in actuator position switch.P1818 Actuator Position Switch

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1818 detected?Perform diagnosis procedure. Refer to [ P1818 ACTUATOR POSITION SWITCH ].Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK ACTUATOR POSITION SWITCH SIGNAL With SDT Start engine. Depress brake pedal and stop vehicle. Set A/T selector lever to "N" position. Select "Data list" mode for "4WD" with SDT. Read out the value of "SHIFT POS SW1", "SHIFT POS SW2", "SHIFT POS SW3", "SHIFT POS SW4". 2) Without SDT Start engine. Depress brake pedal and stop vehicle. Set A/T selector lever to "N" position. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 4. GO TO 2. 2 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ACTUATOR POSITION SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the transfer control device (actuator position switch) harness connector. Check continuity between the following terminals. Transfer control unit harness connector M152 terminal 10 and transfer control device (actuator position switch) harness connector F58 terminal 26. Transfer control unit harness connector M152 terminal 11 and transfer control device (actuator position switch) harness connector F58 terminal 20. Transfer control unit harness connector M152 terminal 12 and transfer control device (actuator position switch) harness connector F58 terminal 21. Transfer control unit harness connector M152 terminal 13 and transfer control device (actuator position switch) harness connector F58 terminal 25. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 3. Repair or replace damaged parts. 3 CHECK GROUND CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Check continuity between transfer control device (actuator position switch) harness connector F58 terminal 22 and ground. Continuity should exist. Also check harness for short to power. Is there continuity? GO TO 4. Repair open circuit or short to power in harness or connectors. 4 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 5. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 5 CHECK DTC Perform "DTC check", after driving a vehicle for a while. Is DTC P1818 displayed? Replace transfer control device. Refer to [ TRANSFER CONTROL DEVICE: REMOVAL AND INSTALLATION ]. Inspection End

Scheme 68

Scheme 68: Diagnosis Procedure
Scheme 68: Diagnosis Procedure

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Scheme 72
Scheme 72
DTCSDTDiagnostic item is detected when...Reference
[P1819]SHIFT ACT CIRMalfunction is detected in transfer shut off relay 1 and transfer shut off relay 2. Malfunction occurs in transfer control device drive circuit.P1819 Transfer Control Device

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1819 detected?Perform diagnosis procedure. Refer to [ P1819 TRANSFER CONTROL DEVICE ].Inspection End.

DIAGNOSIS PROCEDURE

Regarding Wiring Diagram information, refer to TRANSFER CONTROL UNIT: WIRING DIAGRAM .

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK POWER SUPPLY Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Check voltage between transfer control unit harness connector terminal and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between transfer control unit harness connector terminals and ground. Are the inspection results normal? GO TO 2. Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse (No. 57, located in the fuse and relay box). 40A fuse (No. J , located in the fuse and fusible link box). Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3. Harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 1 harness connector E156 terminal 5. Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1. Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 2 and ground. Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal 25. Battery and ignition switch. Transfer shut off relay 1. Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. 2 CHECK GROUND CIRCUIT Turn ignition switch "OFF". Disconnect transfer control unit harness connector. Check continuity between transfer control unit harness connector M153 terminal 32 and ground. Continuity should exist. Also check harness for short to power. Is there continuity? GO TO 3. Repair open circuit or short to power in harness or connectors. 3 CHECK POWER SUPPLY SIGNAL Turn ignition switch "OFF". (Stay for at least 5 seconds.) Connect transfer control unit harness connector. Check voltage between transfer control unit harness connector terminal and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 4. Check the following. If any items are damaged, repair or replace damaged parts. Harness for short or open between battery and transfer shut off relay 2 harness connector E157 terminal 1. Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M153 terminal 40. Transfer shut off relay 2. 4 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 5 (With SDT) or GO TO 6 (Without SDT). Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 5 PERFORM DTC CHECK (WITH SDT) With SDT Turn ignition switch "ON". (Do not start engine.) Select "DTC check" mode for "4WD" with SDT. Touch "Clear". Turn ignition switch "OFF" and wait at least 10 seconds. Perform "DTC check" again. Is the "SHIFT ACT CIR [P1819]" displayed? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End. 6 PERFORM SELF-DIAGNOSIS (WITHOUT SDT) Without SDT Perform the self-diagnosis and then erase self-diagnosis results. Refer to [ SDT FUNCTION (4WD) ]. Perform the self-diagnosis again. Do the self-diagnosis results indicate transfer control device? Replace transfer control unit. Refer to [ TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End

Scheme 73

Scheme 73: Diagnosis Procedure
Scheme 73: Diagnosis Procedure

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Scheme 81
DTCSDTDiagnostic item is detected when...
[P1820]ENGINE SPEED SIGMalfunction is detected in engine speed signal that is output from ECM through CAN communication. Improper signal is input while driving.

DTC DETECTION LOGIC CHART

StepActionYESNO
1DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Perform "DTC check". Is DTC P1820 detected?Perform diagnosis procedure. Refer to [ P1820 ENGINE SPEED SIGNAL ].Inspection End.

DIAGNOSIS PROCEDURE

StepActionYESNO
1CHECK DTC WITH ECM Perform "DTC check" with ECM. Refer to [ SDT FUNCTION (ENGINE / POWERTRAIN) ] Is any malfunction detected by "DTC check"?Check the malfunctioning system.GO TO 2.
2CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?GO TO 3.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3CHECK DTC Perform "DTC check", after driving a vehicle for a while. Is DTC P1820 displayed?Perform "DTC check" with ECM again.Inspection End.

DIAGNOSIS PROCEDURE

DIAGNOSTIC PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK ATP SWITCH SIGNAL With SDT Start engine. Select "Data list" mode for "4WD" with SDT. Read out the value of "ATP SWITCH". 2) Without SDT Start engine. Check voltage between transfer control unit harness connector terminal and ground. Are the inspection results normal? GO TO 5. GO TO 2. 2 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ATP SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the ATP switch harness connector. Check continuity between transfer control unit harness connector M152 terminal 23 and ATP switch harness connector F55 terminal 8. Continuity should exist. Also check harness for short to ground and short to power. Does continuity exist? GO TO 3. Repair or replace damaged parts. 3 CHECK GROUND CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect ATP switch harness connector. Check continuity between ATP switch harness connector F55 terminal 9 and ground. Continuity should exist. Also check harness for short to power. Does continuity exist? GO TO 4. Repair open circuit or short to power in harness or connectors. 4 CHECK ATP SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove ATP switch. Refer to [ 4WD SYSTEM: COMPONENT PARTS LOCATION ]. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9. Are the inspection results normal? GO TO 5. Replace ATP switch. 5 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 6. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 6 CHECK ATP WARNING LAMP Turn ignition switch "ON". (Do not start engine.) A/T selector lever "N" position and engage the parking brake. Switch 4WD shift switch from 4H to 4LO or 4LO to 4H. Does the ATP warning lamp turn ON while the actuator motor is operating? Inspection End. Refer to [ ATP WARNING LAMP DOES NOT TURN ON ]

Scheme 82

Scheme 82: DIAGNOSTIC PROCEDURE
Scheme 82: DIAGNOSTIC PROCEDURE

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Scheme 89

Scheme 89: Component Inspection
Scheme 89: Component Inspection
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect ATP switch harness connector.
  3. Remove ATP switch. Refer to [ «4WD SYSTEM: COMPONENT PARTS LOCATION»(ref-375706-S41262033902010102800000) ].
  4. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9. TERMINAL CONTINUITY CHART Terminal Condition Continuity 8 - 9 Push ATP switch Yes Release ATP switch No
  5. If the inspection results are abnormal replace the ATP switch.

4WD System Symptoms: Symptom Table

SymptomConditionReference page
4WD shift indicator lamp and 4LO indicator lamp do not turn ON (lamp check)Ignition switch: ON4WD Shift Indicator Lamp and 4Lo Indicator Lamp Do Not Turn On
4WD warning lamp does not turn ON (lamp check)4WD Warning Lamp Does Not Turn On
4WD shift indicator lamp or 4LO indicator lamp does not changeEngine running4WD Shift Indicator Lamp or 4Lo Indicator Lamp Do Not Change
ATP warning lamp does not turn ONAtp Warning Lamp Does Not Turn On
ATP switch is malfunctioningATP Switch Circuit Check
4WD shift indicator lamp repeats flashingWhile driving4WD Shift Indicator Lamp Keeps Flashing
4WD warning lamp flashes slowly (1 time/2 seconds)4WD Warning Lamp Flashes Slowly

SYMPTOM CHART

Regarding Wiring Diagram information, refer to TRANSFER CONTROL UNIT: WIRING DIAGRAM .

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. Are the inspection results normal? GO TO 2. Perform repairs as necessary. 2 CHECK COMBINATION METER POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect combination meter harness connector. Check voltage between combination meter harness connector terminals and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between combination meter harness connector terminals and ground. Are the inspection results normal? GO TO 3. Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse [No. 14, located in the fuse block (J/B)] or ignition switch. Harness for short or open between ignition switch and combination meter harness connector terminal 16 3 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch "OFF". (Stay for at least 5 seconds.) Check continuity between transfer control unit harness connector M153 terminal 38 and combination meter harness connector M24 terminal 26. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity? GO TO 4. Repair or replace damaged parts. 4 CHECK INDICATOR LAMP CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Connect combination meter harness connector. Disconnect transfer control unit harness connector. Turn ignition switch "ON". (Do not start engine.) Ground the following terminal using suitable wiring. Transfer control unit harness connector M153 terminal 38 and ground. Does the indicator lamp turn on? GO TO 5. Replace the combination meter. Refer to [ COMBINATION METER: REMOVAL AND INSTALLATION ] 5 SYMPTOM CHECK Check again. Does the symptom still occur? GO TO 6. Inspection End. 6 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? Inspection End. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts

Scheme 90

Scheme 90: Diagnosis Procedure
Scheme 90: Diagnosis Procedure

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Scheme 95

Regarding Wiring Diagram information, refer to TRANSFER CONTROL UNIT: WIRING DIAGRAM .

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS Refer to [ P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ]. Are the inspection results normal? GO TO 2. Perform repairs as necessary. 2 CHECK COMBINATION METER POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect combination meter harness connector. Check voltage between combination meter harness connector terminals and ground. 4. Turn ignition switch "ON". (Do not start engine.) 5. Check voltage between combination meter harness connector terminals and ground. Are the inspection results normal? GO TO 3. Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse [No. 14, located in the fuse block (J/B)] or ignition switch. Harness for short or open between ignition switch and combination meter harness connector terminal 16 3 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch "OFF". (Stay for at least 5 seconds.) Check continuity between the following terminals. Transfer control unit harness connector M153 terminal 35 and combination meter harness connector M24 terminal 30. Transfer control unit harness connector M153 terminal 36 and combination meter harness connector M24 terminal 27. Transfer control unit harness connector M153 terminal 37 and combination meter harness connector M24 terminal 29. Continuity should exist. Also check harness for short to ground and short to power. Does continuity exist? GO TO 4. Repair or replace damaged parts. 4 CHECK INDICATOR LAMP CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Connect combination meter harness connector. Disconnect transfer control unit harness connector. Turn ignition switch "ON". (Do not start engine.) Ground the following terminals using suitable wiring. Transfer control unit harness connector M153 terminal 35 and ground. Transfer control unit harness connector M153 terminal 36 and ground. Transfer control unit harness connector M153 terminal 37 and ground. Do indicator lamps turn on? GO TO 5. Replace the combination meter. Refer to [ COMBINATION METER: REMOVAL AND INSTALLATION ] 5 SYMPTOM CHECK Check again. Does the symptom still occur? GO TO 6. Inspection End. 6 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? Inspection End. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts

Scheme 96

Scheme 96: Diagnosis Procedure
Scheme 96: Diagnosis Procedure

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Scheme 101

Scheme 101
Scheme 101
StepActionYESNO
1CONFIRM THE SYMPTOM Confirm 4WD shift indicator lamp and 4LO indicator lamp when ignition switch is turned to ON. Do 4WD shift indicator lamp and 4LO indicator lamp turn on?GO TO 2.Go to [ 4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT TURN ON ].
3CHECK SYSTEM FOR STOP LAMP SWITCH Perform trouble diagnosis for stop lamp switch system. Refer to
2CHECK SYSTEM FOR 4WD SHIFT SWITCH Perform trouble diagnosis for 4WD shift switch system. Refer to [ P1813 4WD SHIFT SWITCH ]. Are the inspection results normal?GO TO 3.Repair or replace damaged parts.
3CHECK SYSTEM FOR WAIT DETECTION SWITCH Perform trouble diagnosis for wait detection switch system. Refer to [ P1814 WAIT DETECTION SWITCH ]. Are the inspection results normal?GO TO 4.Repair or replace damaged parts.
4CHECK SYSTEM FOR 4LO SWITCH Perform trouble diagnosis for 4LO switch system. Refer to [ P1810 4 LO SWITCH ]. Are the inspection results normal?GO TO 5.Repair or replace damaged parts.
5CHECK SYSTEM FOR ATP SWITCH Perform trouble diagnosis for ATP switch system. Refer to [ ATP SWITCH CIRCUIT CHECK ]. Are the inspection results normal?GO TO 6.Repair or replace damaged parts.
6SYMPTOM CHECK Check again. Does the symptom still occur?GO TO 7.Inspection End
7CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?GO TO 8.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
8CHECK TRANSFER INNER PARTS Disassemble transfer assembly. Refer to [ TRANSFER ASSEMBLY: DISASSEMBLY AND ASSEMBLY ]. Check transfer inner parts. Are the inspection results normal?Inspection End.Repair or replace damaged parts.

DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE Step Action YES NO 1 CHECK SYSTEM FOR CAN COMMUNICATION LINE Perform "DTC check". Refer to [ SDT FUNCTION (4WD) ]. Do "DTC check" results indicate CAN communication? Perform trouble diagnosis for CAN communication line. Refer to [ DTC INDEX: TRANSFER CONTROL UNIT ]. GO TO 2. 2 CHECK SYSTEM FOR 4WD SHIFT SWITCH Perform trouble diagnosis for 4WD shift switch system. Refer to [ P1813 4WD SHIFT SWITCH ]. Are the inspection results normal? GO TO 3. Repair or replace damaged parts. 3 CHECK SYSTEM FOR PNP SWITCH SIGNAL Perform trouble diagnosis for PNP switch signal system. Refer to [ P1816 PNP SWITCH (A/T) ]. Are the inspection results normal? GO TO 4. Repair or replace damaged parts. 4 CHECK SYSTEM FOR ATP SWITCH Perform trouble diagnosis for ATP switch system. Refer to [ ATP SWITCH CIRCUIT CHECK ]. Are the inspection results normal? GO TO 5. Repair or replace damaged parts. 5 CHECK ATP WARNING LAMP CIRCUIT Disconnect ATP switch harness connector. Turn ignition switch "ON". (Do not start engine.) Ground terminal 8 on ATP switch connector F55 using suitable wiring. 4. Turn ignition switch "OFF". (Stay for at least 5 seconds.) Does ATP warning lamp turn on? GO TO 9. GO TO 6. 6 CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and combination meter harness connector. Check continuity between transfer control unit harness connector M153 terminal 39 and combination meter harness connector M24 terminal 21. Continuity should exist. Also check harness for short to ground and short to power. Does continuity exist? GO TO 7. Repair or replace damaged parts. 7 CHECK HARNESS BETWEEN COMBINATION METER AND ATP SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect ATP switch harness connector. Check continuity between combination meter harness connector M24 terminal 1 and ATP switch harness connector F55 terminal 8. Continuity should exist. Also check harness for short to ground and short to power. Does continuity exist? GO TO 8. Repair or replace damaged parts. 8 SYMPTOM CHECK Check again. Does the symptom still occur? GO TO 9. Inspection End. 9 CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal? GO TO 10. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 10 CHECK TRANSFER INNER PARTS Disassemble transfer assembly. Refer to [ TRANSFER ASSEMBLY: DISASSEMBLY AND ASSEMBLY ]. Check transfer inner parts. Are the inspection results normal? Inspection End. Repair or replace damaged parts

Scheme 102

Scheme 102: Diagnosis Procedure
Scheme 102: Diagnosis Procedure

Scheme 103

Scheme 103
Scheme 103
StepActionYESNO
1CONFIRM THE SYMPTOM Set 4WD shift switch to "2WD". Drive the vehicle straight forward and backward keeping speed under 20 km/h (12 MPH). Does 4WD shift indicator lamp keep flashing?GO TO 2.Inspection End.
2CHECK SYSTEM FOR WAIT DETECTION SWITCH Perform trouble diagnosis for wait detection switch system. Refer to [ P1814 WAIT DETECTION SWITCH ]. Are the inspection results normal?GO TO 3.Repair or replace damaged parts.
3CHECK SYSTEM FOR 4LO SWITCH Perform trouble diagnosis for 4LO switch. Refer to [ P1810 4 LO SWITCH ]. Are the inspection results normal?GO TO 4.Repair or replace damaged parts.
4SYMPTOM CHECK Check again. Does the symptom still occur?GO TO 5.Inspection End.
5CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?GO TO 6.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
6CHECK TRANSFER INNER PARTS Disassemble transfer assembly. Refer to [ TRANSFER ASSEMBLY: DISASSEMBLY AND ASSEMBLY ]. Check transfer inner parts. Are the inspection results normal?Inspection End.Repair or replace damaged parts.

DIAGNOSIS PROCEDURE

StepActionYESNO
1CHECK TIRES Check the following. Refer to [ SERVICE DATA AND SPECIFICATIONS ]. Tire size Tire wear Tire pressure Are the inspection results normal?GO TO 2.Repair or replace damaged parts.
2SYMPTOM CHECK Check again. Does the symptom still occur?GO TO 3.Inspection End.
3CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [ TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?Inspection End.Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

DIAGNOSIS PROCEDURE

Refer to [ TRANSFER FLUID: REPLACEMENT ].

Refer to [ TRANSFER FLUID: INSPECTION ].

Scheme 104

Scheme 104: REMOVAL
Scheme 104: REMOVAL
  1. Switch 4WD shift switch to 2WD and set transfer assembly to 2WD. CAUTION: When removing transfer control unit, transfer state must be at 2WD.
  2. Turn the ignition switch OFF and disconnect negative battery terminal.
  3. Remove the lower instrument panel LH. Refer to [ «INSTRUMENT PANEL ASSEMBLY: REMOVAL AND INSTALLATION»(ref-375695-S37538787532010102800000) ]
  4. Disconnect the two transfer control unit connectors.
  5. Remove the transfer control unit bolts.
  6. Remove the transfer control unit.

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