Pre-Test Instructions

Perform PINPOINT TESTS only after completing VISUAL INSPECTION, KEY ON, ENGINE RUNNING TEST and CONTINUOUS MONITOR TEST.

Each PINPOINT TEST assumes a fault has been detected. Failure to comply with correct testing order can result in error.
Test results depend on proper operation of related parts. Correct any defects in this area before passing pinpoint test.
DO NOT replace parts unless test results indicate it.
When one or more service codes are shown, start with first code received.
DO NOT measure voltage or resistance at control module or connect any test lights unless specified.
Isolate both ends of a circuit and turn ignition off whenever checking for shorts or continuity, unless specified.
Disconnect solenoids and switches from harness before measuring for continuity, resistance or energizing with 12-volt source.
In using pinpoint test, follow each step in order, starting from first step in appropriate test. Follow each step until fault is found.
Unless otherwise specified, an open is defined as any resistance reading greater than 5 ohms.
Unless otherwise specified, a short is defined as any resistance reading less than 10 k/ohms (10,000 ohms) to ground.

NOTE: In the following diagnostic tests, illustrations are provided Courtesy of Ford Motor Co.

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article before disconnecting battery.