ATP Warning Lamp Does Not Turn ON

ATP WARNING LAMP DOES NOT TURN ON





Description
ATP warning lamp does not turn ON when the transfer case is switched in or out of 4LO with the A/T selector lever in N position.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
1.CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Scan Tool Testing and Procedures.
Do the self-diagnostic results indicate CAN communication?
YES - Perform trouble diagnosis for CAN communication line. CAN Communication.
NO - GO TO 2.
2.CHECK SYSTEM FOR 4WD SHIFT SWITCH
Perform trouble diagnosis for 4WD shift switch system. P1813.
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.CHECK SYSTEM FOR TRANSMISSION RANGE SWITCH SIGNAL
Perform trouble diagnosis for transmission range switch signal system. P0705.
OK or NG
OK - GO TO 4.
NG - Repair or replace damaged parts.
4.CHECK SYSTEM FOR ATP SWITCH
Perform trouble diagnosis for ATP switch system. Component Tests and General Diagnostics.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.CHECK ATP WARNING LAMP CIRCUIT
1. Disconnect ATP switch harness connector.
2. Turn ignition switch ON. (Do not start engine.)





3. Ground the following terminal using suitable wiring.
- ATP switch harness connector F55 terminal 8 and ground.
4. Turn ignition switch OFF. (Stay for at least 5 seconds.)
Does ATP warning lamp turn on?
OK - GO TO 9.
NG - GO TO 6.
6.CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and combination meter harness connector.





3. Check continuity between transfer control unit harness connector E143 terminal 39 and combination meter harness connector
M24 terminal 6.






Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 7.
NG - Repair or replace damaged parts.
7.CHECK HARNESS BETWEEN COMBINATION METER AND ATP SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect ATP switch harness connector.





3. Check continuity between combination meter harness connector M24 terminal 7 and ATP switch harness connector F55 terminal 8.






Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 8.
NG - Repair or replace damaged parts.
8.CHECK COMBINATION METER
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Check the combination meter. .
OK or NG
OK - GO TO 9.
NG - Replace the combination meter. .
9.SYMPTOM CHECK
Check again.
OK or NG
OK - Inspection End.
NG - GO TO 10.
10.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Pinout Values and Diagnostic Parameters.
OK or NG
OK - GO TO 11.
NG - Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
11.CHECK TRANSFER INNER PARTS
1. Disassemble transfer assembly. Disassembly And Assembly.
2. Check transfer inner parts.
OK or NG
OK - Inspection End.
NG - Repair or replace damaged parts.