Comanche 2WD L4-150 2.5L VIN P MFI (1991)
Automatic Shut Down (ASD) Relay: Testing and Inspection
Relay Terminal Identification
ASD RELAY TERMINAL IDENTIFICATION
The following is a list of the terminal numbers, with circuit codes, and color codes, and their function:
Circuit No. Terminal No.
Color Code
Description
A14
30
Red
Has battery input voltage supplied through fusible link.
A142
87
Green/Org.
Connected to A142 circuit (terminal 30) in the energized position, supplies output voltage to fuel pump,
O2 sensor, fuel injectors, and coil.
A21
86
Blue
Connected to the electromagnet, this terminal provides input voltage to relay allowing the SBEC to
control the relay through terminal No.85.
K51
85
Blue/yel.
Connected to the electromagnet (diode) and grounded by the SBEC when distributor signal is present.
N/A
87A
N/A
Not used in these applications.
ASD RELAY TEST
NOTE: The ASD relay operation may be tested with the use of the DRB II scanner or equivalent. Refer to COMPUTERIZED ENGINE
CONTROLS/DIAGNOSIS AND TESTING for procedure. If no scanner is available proceed with the following test.
1.
Connect a voltmeter to the A142 (terminal 30) wire at the ASD connector. Check for battery voltage. If no voltage is present, check fuse #15 in the
power distribution center. If voltage is present proceed to step 2.
2.
Connect the voltmeter to the A14 (terminal 87) wire at the ASD connector. Turn the ignition key to the START position and crank the engine. If
output voltage is present during cranking, the ASD relay is functioning normally and no further testing of the ASD relay is necessary. If no voltage
is present at the A14 wire, proceed to step 3.