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Transmission Control System (Smoother) 7A-155 P1901 (Flash Code 19) Circuit Description • The ignition switch is ON. Condition for Setting the DTC • The TCM detects that the half-clutch adjustment fast switch signal is stuck at the ON position (high Action Taken When the DTC Sets • The TCM does not illuminate the transmission warning lamp when the diagnostic runs and fails. • The TCM inhibits half-clutch adjustment. Condition for Clearing the DTC • A current DTC clears when the diagnostic runs and does not fail. • A history DTC clears when the diagnostic runs and does not fail. Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section. DTC P1901 (Flash Code 19) Schematic Reference: Transmission Controls Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check - — Go to Step 2 Go to Diagnostic System Check - Transmission Controls 2 1. Install the Tech 2. Tech 2. Does the Fast Switch parameter indicate OFF? — Go to Diagnostic Aids Go to Step 3 3 1. Turn OFF the ignition. harness connector. 3. Turn ON the ignition, with the engine OFF. Tech 2. Does the Fast Switch parameter indicate OFF? — Go to Step 5 Go to Step 4 4 1. Test the half-clutch adjustment switch circuit between the transmission control module 2. Repair the circuit(s) as necessary. Did you find and correct the condition? — Go to Step 7 Go to Step 6 5 Replace the half-clutch adjustment switch. Did you complete the replacement? — Go to Step 7 — 6 Important: Did you complete the replacement? — Go to Step 7 — |