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C1921 ENGINE SPEED SIGNAL STC-115 < COMPONENT DIAGNOSIS > [WITH 4WAS] C D E F H I J K L M A B STC N O P C1921 ENGINE SPEED SIGNAL Description INFOID:0000000001666434 • The engine speed signal is transmitted to 4WAS main control unit via CAN communication. DTC Logic INFOID:0000000001666435 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. RECHECK DTC With CONSULT-III 1. Turn the ignition switch from OFF to ON. 2. Perform 4WAS main control unit self-diagnosis. Is DTC “C1921” detected? YES >> Proceed to diagnosis procedure. Refer to STC-115, "Diagnosis Procedure" . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000001666436 1. PERFORM ECM SELF-DIAGNOSIS With CONSULT-III Perform ECM self-diagnosis. Is any error system detected? YES >> Check the error system. NO >> GO TO 2. 2. PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT) With CONSULT-III Perform 4WAS main control unit self-diagnosis. Is DTC “U1000” or “U1010” detected? YES >> Check the error system. NO >> GO TO 3. 3. PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT) With CONSULT-III Perform 4WAS main control unit self-diagnosis. YES >> Replace 4WAS main control unit. Refer to NO >> GO TO 4. 4. INFORMATION CHECK With CONSULT-III Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to . Is each data the standard value? YES >> Check that there is no malfunction in each harness connector pin terminal or disconnection. NO >> Replace 4WAS main control unit. Refer to DTC Items (CONSULT-III screen terms) Diagnostic item is detected when... Possible cause C1921 ENG REV SIGNAL Malfunction is detected in engine speed signal that is Engine speed signal error |