TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 122 of 1417

ABS - CODE S2B 04 (RIGHT SIDE - YELLOW CHANNEL) - Continued

b.

Disconnect main 28-pin connector at ECU (Volume 3, WP

0452).

c.

Connect multimeter red lead to 28-pin connector, terminal 2. Refer to point to point schematics.

d.

Connect multimeter black lead to 28-pin connector, terminal 11.

e.

Meter reading should be between 980 and 2,350 ohms.

f.

If meter reading is correct, connect ECU connector. Listen for locks to "click" in place to ensure a sound

connection.

CONDITION/INDICATION

IS WHEEL SPEED SENSOR WIRING OPEN OR SHORTED?

DECISION

YES - Replace ABS wiring harness (Volume 3, WP

0467). Go to Step (4) to verify problem is solved.

NO - Go to Step (3).

TM 9-2320-272-23-2

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