Shadow Convertible L4-153 2.5L SOHC Turbo (1991)
is present at the A61 wire, proceed to step 3.
3.
Connect the voltmeter to the K51 (terminal 85) wire at the ASD connector. Turn the ignition key to the RUN position. Input voltage from the
SBEC to the ASD relay should be present. If voltage is present proceed to step 4. If no voltage is present, disconnect the 60-Way SBEC connector,
and the ASD relay connector. Connect an ohmmeter between the K51 (terminal 85) wire and the DB/YL wire at pin connector no. 51 of the SBEC
connector, and check for continuity. If continuity exists, the problem is computer related. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection
If no continuity exists, repair open in wire, reconnect SBEC and ASD relay, and test operation.
4.
Connect voltmeter to A21 (terminal 86) wire at ASD connector. Turn ignition key to START position, and crank engine, while observing voltage
at A21. Voltage should be present at A21 and drop to less than 1 volt within 2 seconds during cranking. If voltage drops ASD relay is functioning,
and no further testing of the ASD relay is necessary. If voltage does not drop, proceed to step 5. If no voltage is present, disconnect the ASD relay,
and connect an ohmmeter between the A21 (terminal 86) and K51 (terminal 85) of the ASD relay and check for continuity. If no continuity exists
replace and ASD relay and test operation.
5.
Disconnect the 60-Way SBEC connector and ASD relay. Connect an ohmmeter between the A21 wire at the ASD relay connector and the DB wire
at pin connector no. 9 of the SBEC. Check for continuity. If no continuity exists repair open in wire, reconnect SBEC and ASD relay, and test
operation. If continuity exists, the problem is computer related. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection
