TM-9-2320-272-23-1

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 1290 of 1313

SLOW AIR RECOVERY OR OCCASIONAL LOW AIR WARNING DURING BRAKING - Continued

b.

Disconnect harness lead at the pressure switch.

c.

Set multimeter to measure resistance.

d.

Connect multimeter red lead to CTIS wiring harness cannon plug.

e.

Connect multimeter black lead to electrical lead at pressure switch.

f.

Meter reading should be less than 200 ohms.

CONDITION/INDICATION

IS THERE CONTINUITY BETWEEN PRESSURE SWITCH AND CTIS WIRING HARNESS CANNON PLUG

AT ECU?

DECISION

YES - Go to Step (3).

NO - Replace faulty CTIS wiring harness (Volume 2, WP

0322). Go to Step (6) to verify problem is solved.

TM 9-2320-272-23-1

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