#86 S10 BLAZER ALDL MODE DRIVER#
GM common codes for OBD1 (for vehicles made before 1995)ġ4 coolant sensor high resistance or shortedġ6 direct ignition system (DIS) fault in circuitĢ3 intake air temp sensor out of range, lowĢ4 vehicle speed (vss) sensor circuit faultĢ5 air temp sensor sensor out of range, highĢ6 quad-driver module (computer) circuit #1 faultĢ7 quad-driver module (computer) 2nd gear circuitĢ8 quad-driver module (computer) circuit #2 faultĢ9 quad driver module (computer) 4th gear circuitĤ1 cam sensor circuit fault, igntion control circuit faultĤ2 electronic spark timing (EST) circuit grounded If you only get code 12, there are no faults stored in the system. The first and last code you'll get is "12", which indicates that the computer is in diagnostic mode. The format is "first digit, short pause, second digit, long pause", and the fact that each code is repeated three times makes it easy to figure out. All GM codes are 2 digit, and each code will repeat three times before moving on to the next stored code. Ground terminal 'A' to 'B' at Assembly Line Diagnostic Link (ALDL. Electronic Spark Timing (EST) must be in Bypass Mode to check ignition timing. Run engine until it reaches normal operating temperature.
1 spark plug wire, or use inductive pick-up.
#86 S10 BLAZER ALDL MODE INSTALL#
WITHOUT STARTING THE ENGINE, turn the key to the 'run' position and watch the "check engine" light. Install timing light with adapter between No. Assuming you have located the ALDL (Assembly Line Data Link) under the left side of the dash, with the engine off, connect the A and B terminals (or the #5 and #6 terminals in the case of an OBD-I vehicle with the 16 pin OBD-II style connector) with your trusty paper clip.
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