Labels:text | screenshot | font | parallel | diagram | document | black and white | number | line | receipt OCR: ELECTRONIC SPARK CONTROL SYSTEM CHECK ALL ENGINES EXCEPT 2.5L THIS CHART ASSUMES CODE 43 IS NOT PRESENT. IF A CODE 43 WAS SET, USE THAT CHART FIRST. "SCAN" TOOL SET ON KNOCK SIGNAL. ENGINE RUNNING AT ABOUT 1500 RPM. IS THERE A KNOCK SIGNAL INDICATED? NO YES 2 ENGINE RUNNING AT 1500 RPM. 3 DISCONNECT KNOCK SENSOR. TAP ENGINE BLOCK IN AREA OF KNOCK SENSOR. REPEAT TEST. DOES "SCAN" INDICATE A KNOCK SIGNAL IS THERE A KNOCK SIGNAL INDICATED? WHILE TAPPING ON ENGINE? YES NO CHECK FOR ROUTING OF WIRE FROM INTERNAL KNOCK SENSOR TO ESC MODULE FOR ENGINE KNOCK PICKING UP FALSE KNOCK SIGNALS OR FAULTY FROM AN ADJACENT WIRE. REROUTE AS SENSOR. NECESSARY. IF ROUTING IS CORRECT, REPLACE ESC MODULE. NO YES DISCONNECT ESC MODULE. ESC SYSTEM OK. PROBE HARNESS TERM. "D" {CKT 486) WITH A TEST LIGHT TO 12 V. LIGHT "ON" LIGHT "OFF" 5 RECONNECT ESC MODULE. REPAIR OPEN GND CKT 486. DISCONNECT KNOCK SENSOR. ENGINE IDLING. MOMENTARILY TOUCH KNOCK SENSOR HARNESS (CKT 496) WITH A TEST LIGHT TO 12V. EACH TIME THE TEST LIGHT CONTACTS CKT 496, A KNOCK SIGNAL SHOULD BE GENERATED. IS A KNOCK SIGNAL INDICATED WITH "SCAN"? YES NO FAULTY CONNECTION AT SENSOR CKT 496 OPEN, SHORTED TO GROUND, OR FAULTY KNOCK SENSOR. FAULTY CONNECTION AT ESC MODULE, OR FAULTY ESC MODULE.
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