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P1810 4 LO SWITCH DLN-29 < COMPONENT DIAGNOSIS > [TRANSFER: TX15B] C E F G H I J K L M A B DLN N O P YES >> GO TO 5. NO >> GO TO 2. 2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND 4LO SWITCH 1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.) 2. Disconnect transfer control unit harness connector and the 4LO switch harness connector. 3. Check continuity between transfer control unit harness connec- Also check harness for short to ground and short to power. Is there continuity? YES >> GO TO 3. NO >> Repair or replace damaged parts. 3. CHECK GROUND CIRCUIT 1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.) 2. Disconnect 4LO switch harness connector. 3. Check continuity between 4LO switch harness connector F60 Also check harness for short to power. Is there continuity? YES >> GO TO 4. >> Repair open circuit or short to power in harness or con- nectors. 4. CHECK 4LO SWITCH 1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.) 2. Disconnect 4LO switch harness connector. 3. Remove 4LO switch. Refer to DLN-13, "Component Parts Location" 4. Push and release 4LO switch and check continuity between Are the inspection results normal? YES >> GO TO 5. NO >> Replace 4LO switch. 5. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to Are the inspection results normal? YES >> GO TO 6. NO >> 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 self-diagnosis. Is DTC P1810 displayed? Continuity should exist. SDIA3364E Continuity should exist. PDIA0203E Terminal Condition Continuity 12 - 13 Push 4LO switch Yes Release 4LO switch No PDIA0204E |