Pinpoint Test B (IDM Failure Code 212)

With ignition off, connect EDIS diagnostic cable to Breakout Box (BOB) and EDIS module. DO NOT connect VR sensor tee or coil tee. Use EDIS "6" overlay. Connect negative and positive leads of EDIS diagnostic cable to battery. Set EDIS diagnostic cable box switch to 4/6 CYLINDER position. Set DVOM on 20-volt AC scale. Start engine. Measure voltage between IDM DETECTOR (30) and BAT- (7) of diagnostic cable Ignition Diagnostic Monitor (IDM) at BOB. If pulses are present, IDM detector output will be 5-7 volts AC. If AC voltage is 5-7 volts, go to next step. If AC voltage is not 5-7 volts, go to step 3).
With ignition off, EDIS module and ECA disconnected, disconnect EDIS module from EDIS module tee, leaving EDIS diagnostic cable connected to vehicle harness connector. Set DVOM on 200-ohm scale. Connect ECA Breakout Box (BOB) to ECA harness connector. Measure resistance between IDM E (41) at BOB and terminal No. 4 at ECA BOB. If resistance is less than 5 ohms, IDM signal at ECA is okay, ECA does not respond to IDM signal. Replace ECA. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article. If resistance is 5 ohms or more, IDM is open. Check connections and/or repair open circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
With ignition off and IDM circuit disconnected, set DVOM on 20-volt AC scale. Push EDIS IDM button at EDIS diagnostic cable connector to BOB. Start engine, and measure voltage between diagnostic cable IDM DETECTOR (30) and BAT- (7) at BOB. If AC voltage is 5-7 volts, go to next step. If AC voltage is not 5-7 volts, IDM output from EDIS module does not exist. Replace EDIS module. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
With ignition off and ECA disconnected, set DVOM on 20-volt AC scale. Crank engine, and measure voltage between diagnostic cable IDM DETECTOR (30) and BAT- (7) at BOB. If voltage is less than 5 volts, go to next step. If voltage is 5 volts or more, ECA is loading IDM signal. Replace ECA. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
With ignition off and EDIS module and ECA disconnected, disconnect EDIS module from diagnostic cable module tee, leaving EDIS diagnostic cable connected to vehicle harness connector. Set DVOM on 20-k/ohm scale. Measure resistance between IDM E (41) and BAT- (7) at BOB. If resistance is 10-k/ohms or more, go to next step. If resistance is less than 10-k/ohms, IDM is shorted low. Check connections and/or repair short circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
With ignition off and EDIS module and ECA disconnected, set DVOM on 20-volt DC scale. With Key On, Engine Off (KOEO), measure voltage between IDM E (41) and BAT- (7) at BOB. If DC voltage is .5 volt or more, IDM is shorted high. Check connections and/or repair short circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
If voltage is less than .5 volt, IDM is shorted to another wire between EDIS module and ECA. Check connections and/or repair short circuit or replace harness. Remove test equipment and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.

CAUTION: Unless directed otherwise, DO NOT connect ECA to ECA Breakout Box (BOB) when performing EDIS diagnostics.